95 c280 problem
#1
06-25-2005, 01:19 PM
95 c280 problem
The outside temperature gauge on the dash climbs up to 137F after about 5 minutes of driving then disappears all together. Any ideas? Thanks!
#2
06-25-2005, 01:35 PM
RE: 95 c280 problem
Try cleaning the sensor which should be under the front bumper cover. It is round a couple of inches long, you might have to pull down the tow hook covers to get at it. Or the lower brake cooling grilles. If that doesn't work the sensor probably is bad? Use a towel and alcohol, nothing stronger then that.
#3
07-01-2005, 03:11 PM
RE: 95 c280 problem
Since I'm not sure of your actual vehicle.......... this post assumes you have a 95 C280 with the Climate Control Pushbutton Unit that sits just above your in-dash stereo.
Check the connections/wiring to your Outside Air Temperature Sensor (B14) first, then try following the instructions below to help determine the problem.
On systems with climate control you should be able to run the A/C System Pushbutton Control Unit's "built-in" Diagnostics to determine what specific code is being generated.
From the codes, you'll get a better idea of what the problem is.
Here's how to enable the built-in diagnostics and what the meanings of the numbers are.
Hope this helps
__________________________________________________ ___________
NOTE --> These Diagnostic Trouble Codes will remain in memory even with the vehicle's battery disconnected.
FAULT DIAGNOSIS STEPS
1. IGNITION : Turn to Position 1
2. Temperature selector : set to "LO"
3. Within 20 seconds press the REST and DEFROST buttons simultaneously for more than 5 seconds.
4. The LED in the RECIRCULATE button flashes and "dI A" appears on the display.
5. Press the AUTO button until all DTC's are displayed and recorded.
6. The current faults are displayed first, then the intermittent faults. "END'" is displayed when all codes have been displayed.
7. To erase codes press v and ^ simultaneously for more than 5 seconds. The display will then show "---". Press AUTO to cancel the erase.
8. IGNITION : OFF to end the test program.
FAULT CODES
DTC Readout Descriptions
026 CAN Bus Communication
226 In-Car Air Temperature Sensor (B10/4)
227 Outside Air Temperature Sensor (B14)
228 Heater Core Temperature Sensor (B10/1)
230 Evaporator Temperature Sensor (B10/6)
231 Engine Coolant Temperature Sensor (B11/4)
232 Refrigerant Pressure Sensor (B12)
233 Refrigerant Temperature Sensor (B12/1)
241 Refrigerant Level
416 Coolant Circulation Pump (A31m1)
417 Left Duovalve (Water Valve) (Y21y1)
418 Right Duovalve (Water Valve) (Y21y2)
419 A/C Compressor Electromagnetic Clutch (A9k1)
420 Closed (Idle) Throttle Speed Increase
421 Pulse Module (N65)
422 Serial Interface Connection (K1) to Instrument Cluster (IC)
451 Diverter Flap (Y11/3)
452 Blend Air Flap (Y11/3)
453 Fresh/Recirculated Air Flap (Y11/3) Long Stroke
454 Fresh/Recirculated Air Flap (Y11/3) Short Stroke
455 Defroster Outlet Flap (Y11/3) Long Stroke
456 Defroster Outlet Flap (Y11/3) Short Stroke
457 Footwell Flap (Y11/3) Long Stroke
458 Footwell Flap (Y11/3) Short Stroke
459 Serial Interface Connection (K2) to Instrument Cluster (IC)
462 Wide Open Throttle (WOT) Position Signal - Diesel Engine Only
__________________________________________________ ______
READING ACTUAL VALUES
1. IGNITION : Position 1
2. Set temperature selector to 72 degrees F.
3. Press the REST button for more than 6 seconds.
4. The left display will alternately show the number "01" and the (in-car) temperature.
5. Press the FAN button and the next component number and its value will be displayed.
6. Press the REST button to end the test program.
COMPONENT UNDER TEST
Number Component
01 In-Car Temperature Sensor with Aspirator Blower (B10/4)
02 Outside Temperature Sensor (B14)
03 Heater Core Temperature Sensor (B10/1)
05 Evaporator Temperature Sensor (B10/6)
06 Engine Coolant Temperature Sensor (ECT) (B11/4)
07 Refrigerant Pressure in Bar
08 Refrigerant Temperature Sensor (B12/1)
09 Not Used
10 Blower Control Voltage
20 Control Current for Auxiliary Fan exp. : 7 = 7 mA
21 Engine RPM. example 00..99 (x100) = 9900
22 Vehicle Speed
23 PIN 58D exp. 99.0 = 99% of Battery Voltage
24 Battery Voltage : 12.8 = 12,8 Volt
40 A/C Controller Software Version Coding
41 A/C Controller Hardware Version
42 Variant code 1
43 Variant code 2
50 Not Used
51 Not Used
52 Not Used
54 ON/OFF A/C Compressor emergency off signal from engine control module.
__________________________________________________ _________________________________
When reading the outside temp sensor actual values you can pour some cold and or hot water on it to see how it responds.
[IMG]local://upfiles/5574/A1E173D825C0419FB96E3F65FEF95AA7.gif[/IMG]
For clarification, this is for this A/C Push Button Control Unit
[IMG]local://upfiles/5574/5D95DAE628C4495DBC37F526F9D32DF1.gif[/IMG]
Check the connections/wiring to your Outside Air Temperature Sensor (B14) first, then try following the instructions below to help determine the problem.
On systems with climate control you should be able to run the A/C System Pushbutton Control Unit's "built-in" Diagnostics to determine what specific code is being generated.
From the codes, you'll get a better idea of what the problem is.
Here's how to enable the built-in diagnostics and what the meanings of the numbers are.
Hope this helps
__________________________________________________ ___________
NOTE --> These Diagnostic Trouble Codes will remain in memory even with the vehicle's battery disconnected.
FAULT DIAGNOSIS STEPS
1. IGNITION : Turn to Position 1
2. Temperature selector : set to "LO"
3. Within 20 seconds press the REST and DEFROST buttons simultaneously for more than 5 seconds.
4. The LED in the RECIRCULATE button flashes and "dI A" appears on the display.
5. Press the AUTO button until all DTC's are displayed and recorded.
6. The current faults are displayed first, then the intermittent faults. "END'" is displayed when all codes have been displayed.
7. To erase codes press v and ^ simultaneously for more than 5 seconds. The display will then show "---". Press AUTO to cancel the erase.
8. IGNITION : OFF to end the test program.
FAULT CODES
DTC Readout Descriptions
026 CAN Bus Communication
226 In-Car Air Temperature Sensor (B10/4)
227 Outside Air Temperature Sensor (B14)
228 Heater Core Temperature Sensor (B10/1)
230 Evaporator Temperature Sensor (B10/6)
231 Engine Coolant Temperature Sensor (B11/4)
232 Refrigerant Pressure Sensor (B12)
233 Refrigerant Temperature Sensor (B12/1)
241 Refrigerant Level
416 Coolant Circulation Pump (A31m1)
417 Left Duovalve (Water Valve) (Y21y1)
418 Right Duovalve (Water Valve) (Y21y2)
419 A/C Compressor Electromagnetic Clutch (A9k1)
420 Closed (Idle) Throttle Speed Increase
421 Pulse Module (N65)
422 Serial Interface Connection (K1) to Instrument Cluster (IC)
451 Diverter Flap (Y11/3)
452 Blend Air Flap (Y11/3)
453 Fresh/Recirculated Air Flap (Y11/3) Long Stroke
454 Fresh/Recirculated Air Flap (Y11/3) Short Stroke
455 Defroster Outlet Flap (Y11/3) Long Stroke
456 Defroster Outlet Flap (Y11/3) Short Stroke
457 Footwell Flap (Y11/3) Long Stroke
458 Footwell Flap (Y11/3) Short Stroke
459 Serial Interface Connection (K2) to Instrument Cluster (IC)
462 Wide Open Throttle (WOT) Position Signal - Diesel Engine Only
__________________________________________________ ______
READING ACTUAL VALUES
1. IGNITION : Position 1
2. Set temperature selector to 72 degrees F.
3. Press the REST button for more than 6 seconds.
4. The left display will alternately show the number "01" and the (in-car) temperature.
5. Press the FAN button and the next component number and its value will be displayed.
6. Press the REST button to end the test program.
COMPONENT UNDER TEST
Number Component
01 In-Car Temperature Sensor with Aspirator Blower (B10/4)
02 Outside Temperature Sensor (B14)
03 Heater Core Temperature Sensor (B10/1)
05 Evaporator Temperature Sensor (B10/6)
06 Engine Coolant Temperature Sensor (ECT) (B11/4)
07 Refrigerant Pressure in Bar
08 Refrigerant Temperature Sensor (B12/1)
09 Not Used
10 Blower Control Voltage
20 Control Current for Auxiliary Fan exp. : 7 = 7 mA
21 Engine RPM. example 00..99 (x100) = 9900
22 Vehicle Speed
23 PIN 58D exp. 99.0 = 99% of Battery Voltage
24 Battery Voltage : 12.8 = 12,8 Volt
40 A/C Controller Software Version Coding
41 A/C Controller Hardware Version
42 Variant code 1
43 Variant code 2
50 Not Used
51 Not Used
52 Not Used
54 ON/OFF A/C Compressor emergency off signal from engine control module.
__________________________________________________ _________________________________
When reading the outside temp sensor actual values you can pour some cold and or hot water on it to see how it responds.
[IMG]local://upfiles/5574/A1E173D825C0419FB96E3F65FEF95AA7.gif[/IMG]
For clarification, this is for this A/C Push Button Control Unit
[IMG]local://upfiles/5574/5D95DAE628C4495DBC37F526F9D32DF1.gif[/IMG]
#4
07-02-2005, 05:45 AM
RE: 95 c280 problem
thanks for the information on that one, but i was talking about the outside temperature gauge that's next to fuel gauge. great information on that one though!
#5
07-03-2005, 05:40 AM
RE: 95 c280 problem
The outside temp indicator in your dash is tied to the climate control system in the car.
If the sensor on the outside of your car is bad, the readout in the dash will show "other-than-normal" values, like what you are experiencing.
Hope this helps
#6
07-03-2005, 01:23 PM
RE: 95 c280 problem
If you look at my center console on page 2 of my signature link, which button should i have selected to put the a/c in "low"? number 1? then press the buttons in the sequence you stated in the above instructions? Thanks for the help 
#7
07-03-2005, 02:55 PM
RE: 95 c280 problem
You have the early '95 version which is a little different than the later version.
It still has the same built-in diagnostics but they are a little different.
here they are
SELF-DIAGNOSTICS
DIAGNOSTIC TROUBLE CODE READOUT
Entering Diagnostic Trouble Code (DTC) Display Mode
1) Turn ignition on. Press down arrow push button until "LO" is shown in A/C-heater control panel temperature display window.
2) Within 20 seconds, simultaneously press REST and defrost push buttons for more than 2 seconds. The Light Emitting Diode (LED) in the recirculated air push button will blink and the display window will show "di R".
3) Press AUTO push button repeatedly, recording each DTC,until all DTCs are displayed. Permanent malfunctions are displayed first. See DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION tables.
4) If no permanent malfunctions are stored, the display window shows "En d". Press AUTO push button again. Intermittent DTCs will be displayed. Intermittent malfunctions are recognizable by the degree (°) symbol displayed along with the DTC (example: "04 °").
5) If no intermittent malfunctions are stored, the display window shows "En° d". Proceed to ERASING DIAGNOSTIC TROUBLE CODES.
Erasing Diagnostic Trouble Codes
1) After display window shows "En° d", press AUTO push button once again. Display window should show "dE L" (delete).
2) To erase DTCs, simultaneously press down and up arrow push buttons for more than 5 seconds. The display window should show "- --". If not erasing DTCs, press the AUTO push button. The permanent DTCs will again be displayed. Proceed to EXITING DTC DISPLAY MODE.
Exiting DTC Display Mode
Simultaneously press down and up arrow push buttons until the pre-selected temperature setting of "72 °F" is displayed. Turn ignition off.
DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION TABLE
----------------------------------------------------------------------
Code(s) (1) Cause
01 ......................Normal
02 ......................A/C-Heater Control Panel
03 & 04 ..............In-Car Temp. Sensor/Blower Short Circuit
05 & 06 ..............In-Car Temp. Sensor/Blower Short/Open Circuit
07 & 08 ..............Outside Temp. Sensor Short Circuit
09 & 10 ..............Outside Temp. Sensor Short/Open Circuit
11 & 12 ..............Heater Core Temp. Sensor Short Circuit
13 & 14 ..............Heater Core Temp. Sensor Short/Open Circuit
19 & 20 ..............Evaporator Temp. Sensor Short Circuit
21 & 22 ..............Evaporator Temp. Sensor Short/Open Circuit
23 & 24 ..............Engine Coolant Temp. Sensor Short Circuit
25 & 26 ............. Engine Coolant Temp. Sensor Short/Open Circuit
27 & 28 ..............Refrigerant Pressure Sensor Short Circuit
29 & 30 ............. Refrigerant Pressure Sensor Short/Open Circuit
31 ......................A/C Compressor RPM Sensor Circuit
32 ......................Drive Belt Slip Recognition Circuit
47 & 48 ...............Auxiliary Coolant Pump Short Circuit
49 & 50 ...............Auxiliary Coolant Pump Short/Open Circuit
51 & 52 ...............Duovalve Short/Open Circuit
53 & 54 ...............Duovalve Short/Open Circuit
59 & 60 ...............A/C Compressor Clutch Circuit
61 & 62 ...............A/C Compressor Clutch Short/Open Circuit
63 & 64 ...............(2) Auxiliary Fan Activation Short Circuit
65 & 66 ...............(2) Auxiliary Fan Activation Short/Open Circuit
67 & 68 ...............(3) Auxiliary Fan Activation Short Circuit
69 & 70 ...............(3) Auxiliary Fan Activation Short/Open Circuit
(1) - Other than codes 01 and 02, the even numbered codes indicate an intermittent malfunction.
(2) - Auxiliary (condenser) fan stage 1 (low speed).
(3) - Auxiliary (condenser) fan stage 2 (high speed).
----------------------------------------------------------------------
DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION TABLE
----------------------------------------------------------------------
Code(s) (1) Cause
71 & 72 ....Closed Throttle Speed Increase Short/Open Circuit
73 & 74 ....Closed Throttle Speed Increase Short Circuit
75 & 76 ....Diverter Flap Switchover Valve
77 & 78 ....Diverter Flap Switchover Valve Short/Open Circuit
79 & 80 ....Tempering Flap Switchover Valve
81 & 82 ....Tempering Flap Switchover Valve Short/Open Circuit
83 & 84 ....(2) Fresh/Recirculated Air Flap Switchover Valve
85 & 86 ....(2) Fresh/Recirculated Air Flap Switchover Valve Short/Open Circuit
87 & 88 ....(3) Fresh/Recirculated Air Flap Switchover Valve
89 & 90 ....(3) Fresh/Recirculated Air Flap Switchover Valve Short/Open Circuit
91 & 92 ....(2) Defroster Flap Switchover Valve
93 & 94 ....(2) Defroster Flap Switchover Valve Short/Open Circuit
95 & 96 ....(3) Defroster Flap Switchover Valve
97 & 98 ....(3) Defroster Flap Switchover Valve Short/Open Circuit
99 & 100 ...(2) Footwell Flap Switchover Valve
101 & 102 ..(2) Footwell Flap Switchover Valve Short/Open Circuit
103 & 104 ..(3) Footwell Flap Switchover Valve
105 & 106 ..(3) Footwell Flap Switchover Valve Short/Open Circuit
(1) - Even numbered codes indicate an intermittent malfunction.
(2) - Long (80 percent movement) stroke.
(3) - Short (20 percent movement) stroke.
----------------------------------------------------------------------
READING SENSOR VALUES
1) Turn ignition on. Simultaneously press down and up arrow push buttons until the pre-selected temperature setting of "72 °F" is displayed. Press the AUTO push button.
2) Press REST push button for more than 6 seconds. The display window will alternately show "01" and an in-car temperature of "72 °F", or "LO" if there is an open circuit, or "HI" if there is a short circuit.
3) By pressing the windshield air distribution push button, the next ascending test step is displayed. By pressing the footwell air distribution push button, the next descending test step is displayed. See SENSOR VALUE DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION table. Press REST push button to exit reading sensor values mode.
SENSOR VALUE DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
------------------------------------------------------------
Code Cause/Value
01 ............................. In-Car Temperature Sensor
02 ............................ Outside Temperature Sensor
03 ........................ Heater Core Temperature Sensor
05 .................... Evaporator Core Temperature Sensor
06 ................. (1) Engine Coolant Temperature Sensor
07 .............................. (2) Refrigerant Pressure
08 ............................ (3) Blower Control Voltage
09 .......... Software Status Of A/C-Heater Control Module
15 ........................... Selected In-Car Temperature
20 ................................. Software Version Code
21 ...................................... (4) Engine Speed
22 .............................. (5) A/C Compressor Speed
23 ......................................... Vehicle Speed
50 ................................ 80.° - 00.° (Not Used)
51 ......... Number Of Actual Drive Belt Slip Recognitions
52 ......... Number Of Actual Drive Belt Slip Recognitions
(1) - A display of "12.°5" corresponds to 125 Celsius (257°F).
(2) - Refrigerant pressure is displayed in bar. One bar equals 14.5037 psi. A display of "12.°8" corresponds to 12.8 bar (185.6 psi).
(3) - A display of "16.°5" corresponds to 1.65 volts.
(4) - A display of "06.°0" to "70.°0" corresponds to 600 RPM to 7000 RPM respectively.
(5) - A display of "00.°0" to "84.°0" corresponds to 0 RPM to 8400 RPM respectively.
------------------------------------------------------------
For clarification this is for this model A/C Pushbutton Unit
[IMG]local://upfiles/5574/2128D765734E4A19B800E5D752700DBF.gif[/IMG]
It still has the same built-in diagnostics but they are a little different.
here they are
SELF-DIAGNOSTICS
DIAGNOSTIC TROUBLE CODE READOUT
Entering Diagnostic Trouble Code (DTC) Display Mode
1) Turn ignition on. Press down arrow push button until "LO" is shown in A/C-heater control panel temperature display window.
2) Within 20 seconds, simultaneously press REST and defrost push buttons for more than 2 seconds. The Light Emitting Diode (LED) in the recirculated air push button will blink and the display window will show "di R".
3) Press AUTO push button repeatedly, recording each DTC,until all DTCs are displayed. Permanent malfunctions are displayed first. See DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION tables.
4) If no permanent malfunctions are stored, the display window shows "En d". Press AUTO push button again. Intermittent DTCs will be displayed. Intermittent malfunctions are recognizable by the degree (°) symbol displayed along with the DTC (example: "04 °").
5) If no intermittent malfunctions are stored, the display window shows "En° d". Proceed to ERASING DIAGNOSTIC TROUBLE CODES.
Erasing Diagnostic Trouble Codes
1) After display window shows "En° d", press AUTO push button once again. Display window should show "dE L" (delete).
2) To erase DTCs, simultaneously press down and up arrow push buttons for more than 5 seconds. The display window should show "- --". If not erasing DTCs, press the AUTO push button. The permanent DTCs will again be displayed. Proceed to EXITING DTC DISPLAY MODE.
Exiting DTC Display Mode
Simultaneously press down and up arrow push buttons until the pre-selected temperature setting of "72 °F" is displayed. Turn ignition off.
DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION TABLE
----------------------------------------------------------------------
Code(s) (1) Cause
01 ......................Normal
02 ......................A/C-Heater Control Panel
03 & 04 ..............In-Car Temp. Sensor/Blower Short Circuit
05 & 06 ..............In-Car Temp. Sensor/Blower Short/Open Circuit
07 & 08 ..............Outside Temp. Sensor Short Circuit
09 & 10 ..............Outside Temp. Sensor Short/Open Circuit
11 & 12 ..............Heater Core Temp. Sensor Short Circuit
13 & 14 ..............Heater Core Temp. Sensor Short/Open Circuit
19 & 20 ..............Evaporator Temp. Sensor Short Circuit
21 & 22 ..............Evaporator Temp. Sensor Short/Open Circuit
23 & 24 ..............Engine Coolant Temp. Sensor Short Circuit
25 & 26 ............. Engine Coolant Temp. Sensor Short/Open Circuit
27 & 28 ..............Refrigerant Pressure Sensor Short Circuit
29 & 30 ............. Refrigerant Pressure Sensor Short/Open Circuit
31 ......................A/C Compressor RPM Sensor Circuit
32 ......................Drive Belt Slip Recognition Circuit
47 & 48 ...............Auxiliary Coolant Pump Short Circuit
49 & 50 ...............Auxiliary Coolant Pump Short/Open Circuit
51 & 52 ...............Duovalve Short/Open Circuit
53 & 54 ...............Duovalve Short/Open Circuit
59 & 60 ...............A/C Compressor Clutch Circuit
61 & 62 ...............A/C Compressor Clutch Short/Open Circuit
63 & 64 ...............(2) Auxiliary Fan Activation Short Circuit
65 & 66 ...............(2) Auxiliary Fan Activation Short/Open Circuit
67 & 68 ...............(3) Auxiliary Fan Activation Short Circuit
69 & 70 ...............(3) Auxiliary Fan Activation Short/Open Circuit
(1) - Other than codes 01 and 02, the even numbered codes indicate an intermittent malfunction.
(2) - Auxiliary (condenser) fan stage 1 (low speed).
(3) - Auxiliary (condenser) fan stage 2 (high speed).
----------------------------------------------------------------------
DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION TABLE
----------------------------------------------------------------------
Code(s) (1) Cause
71 & 72 ....Closed Throttle Speed Increase Short/Open Circuit
73 & 74 ....Closed Throttle Speed Increase Short Circuit
75 & 76 ....Diverter Flap Switchover Valve
77 & 78 ....Diverter Flap Switchover Valve Short/Open Circuit
79 & 80 ....Tempering Flap Switchover Valve
81 & 82 ....Tempering Flap Switchover Valve Short/Open Circuit
83 & 84 ....(2) Fresh/Recirculated Air Flap Switchover Valve
85 & 86 ....(2) Fresh/Recirculated Air Flap Switchover Valve Short/Open Circuit
87 & 88 ....(3) Fresh/Recirculated Air Flap Switchover Valve
89 & 90 ....(3) Fresh/Recirculated Air Flap Switchover Valve Short/Open Circuit
91 & 92 ....(2) Defroster Flap Switchover Valve
93 & 94 ....(2) Defroster Flap Switchover Valve Short/Open Circuit
95 & 96 ....(3) Defroster Flap Switchover Valve
97 & 98 ....(3) Defroster Flap Switchover Valve Short/Open Circuit
99 & 100 ...(2) Footwell Flap Switchover Valve
101 & 102 ..(2) Footwell Flap Switchover Valve Short/Open Circuit
103 & 104 ..(3) Footwell Flap Switchover Valve
105 & 106 ..(3) Footwell Flap Switchover Valve Short/Open Circuit
(1) - Even numbered codes indicate an intermittent malfunction.
(2) - Long (80 percent movement) stroke.
(3) - Short (20 percent movement) stroke.
----------------------------------------------------------------------
READING SENSOR VALUES
1) Turn ignition on. Simultaneously press down and up arrow push buttons until the pre-selected temperature setting of "72 °F" is displayed. Press the AUTO push button.
2) Press REST push button for more than 6 seconds. The display window will alternately show "01" and an in-car temperature of "72 °F", or "LO" if there is an open circuit, or "HI" if there is a short circuit.
3) By pressing the windshield air distribution push button, the next ascending test step is displayed. By pressing the footwell air distribution push button, the next descending test step is displayed. See SENSOR VALUE DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION table. Press REST push button to exit reading sensor values mode.
SENSOR VALUE DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
------------------------------------------------------------
Code Cause/Value
01 ............................. In-Car Temperature Sensor
02 ............................ Outside Temperature Sensor
03 ........................ Heater Core Temperature Sensor
05 .................... Evaporator Core Temperature Sensor
06 ................. (1) Engine Coolant Temperature Sensor
07 .............................. (2) Refrigerant Pressure
08 ............................ (3) Blower Control Voltage
09 .......... Software Status Of A/C-Heater Control Module
15 ........................... Selected In-Car Temperature
20 ................................. Software Version Code
21 ...................................... (4) Engine Speed
22 .............................. (5) A/C Compressor Speed
23 ......................................... Vehicle Speed
50 ................................ 80.° - 00.° (Not Used)
51 ......... Number Of Actual Drive Belt Slip Recognitions
52 ......... Number Of Actual Drive Belt Slip Recognitions
(1) - A display of "12.°5" corresponds to 125 Celsius (257°F).
(2) - Refrigerant pressure is displayed in bar. One bar equals 14.5037 psi. A display of "12.°8" corresponds to 12.8 bar (185.6 psi).
(3) - A display of "16.°5" corresponds to 1.65 volts.
(4) - A display of "06.°0" to "70.°0" corresponds to 600 RPM to 7000 RPM respectively.
(5) - A display of "00.°0" to "84.°0" corresponds to 0 RPM to 8400 RPM respectively.
------------------------------------------------------------
For clarification this is for this model A/C Pushbutton Unit
[IMG]local://upfiles/5574/2128D765734E4A19B800E5D752700DBF.gif[/IMG]
#8
07-08-2005, 07:44 PM
RE: 95 c280 problem
[quote]ORIGINAL: SL600_Cruzin
You have the early '95 version which is a little different than the later version.
It still has the same built-in diagnostics but they are a little different.
here they are
SELF-DIAGNOSTICS
DIAGNOSTIC TROUBLE CODE READOUT
Entering Diagnostic Trouble Code (DTC) Display Mode
1) Turn ignition on. Press down arrow push button until "LO" is shown in A/C-heater control panel temperature display window.
2) Within 20 seconds, simultaneously press REST and defrost push buttons for more than 2 seconds. The Light Emitting Diode (LED) in the recirculated air push button will blink and the display window will show "di R".3) Press AUTO push button repeatedly, recording each DTC,until all DTCs are displayed. Permanent malfunctions are displayed first. See DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION tables.
4) If no permanent malfunctions are stored, the display window shows "En d". Press AUTO push button again. Intermittent DTCs will be displayed. Intermittent malfunctions are recognizable by the degree (°) symbol displayed along with the DTC (example: "04 °").
5) If no intermittent malfunctions are stored, the display window shows "En° d". Proceed to ERASING DIAGNOSTIC TROUBLE CODES.
Erasing Diagnostic Trouble Codes
1) After display window shows "En° d", press AUTO push button once again. Display window should show "dE L" (delete).
2) To erase DTCs, simultaneously press down and up arrow push buttons for more than 5 seconds. The display window should show "- --". If not erasing DTCs, press the AUTO push button. The permanent DTCs will again be displayed. Proceed to EXITING DTC DISPLAY MODE.
Exiting DTC Display Mode
Simultaneously press down and up arrow push buttons until the pre-selected temperature setting of "72 °F" is displayed. Turn ignition off.
DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION TABLE
----------------------------------------------------------------------
Code(s) (1) Cause
01 ......................Normal
02 ......................A/C-Heater Control Panel
03 & 04 ..............In-Car Temp. Sensor/Blower Short Circuit
05 & 06 ..............In-Car Temp. Sensor/Blower Short/Open Circuit
07 & 08 ..............Outside Temp. Sensor Short Circuit
09 & 10 ..............Outside Temp. Sensor Short/Open Circuit
11 & 12 ..............Heater Core Temp. Sensor Short Circuit
13 & 14 ..............Heater Core Temp. Sensor Short/Open Circuit
19 & 20 ..............Evaporator Temp. Sensor Short Circuit
21 & 22 ..............Evaporator Temp. Sensor Short/Open Circuit
23 & 24 ..............Engine Coolant Temp. Sensor Short Circuit
25 & 26 ............. Engine Coolant Temp. Sensor Short/Open Circuit
27 & 28 ..............Refrigerant Pressure Sensor Short Circuit
29 & 30 ............. Refrigerant Pressure Sensor Short/Open Circuit
31 ......................A/C Compressor RPM Sensor Circuit
32 ......................Drive Belt Slip Recognition Circuit
47 & 48 ...............Auxiliary Coolant Pump Short Circuit
49 & 50 ...............Auxiliary Coolant Pump Short/Open Circuit
51 & 52 ...............Duovalve Short/Open Circuit
53 & 54 ...............Duovalve Short/Open Circuit
59 & 60 ...............A/C Compressor Clutch Circuit
61 & 62 ...............A/C Compressor Clutch Short/Open Circuit
63 & 64 ...............(2) Auxiliary Fan Activation Short Circuit
65 & 66 ...............(2) Auxiliary Fan Activation Short/Open Circuit
67 & 68 ...............(3) Auxiliary Fan Activation Short Circuit
69 & 70 ...............(3) Auxiliary Fan Activation Short/Open Circuit
(1) - Other than codes 01 and 02, the even numbered codes indicate an intermittent malfunction.
(2) - Auxiliary (condenser) fan stage 1 (low speed).
(3) - Auxiliary (condenser) fan stage 2 (high speed).
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DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION TABLE
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Code(s) (1) Cause
71 & 72 ....Closed Throttle Speed Increase Short/Open Circuit
73 & 74 ....Closed Throttle Speed Increase Short Circuit
75 & 76 ....Diverter Flap Switchover Valve
77 & 78 ....Diverter Flap Switchover Valve Short/Open Circuit
79 & 80 ....Tempering Flap Switchover Valve
81 & 82 ....Tempering Flap Switchover Valve Short/Open Circuit
83 & 84 ....(2) Fresh/Recirculated Air Flap Switchover Valve
85 & 86 ....(2) Fresh/Recirculated Air Flap Switchover Valve Short/Open Circuit
87 & 88 ....(3) Fresh/Recirculated Air Flap Switchover Valve
89 & 90 ....(3) Fresh/Recirculated Air Flap Switchover Valve Short/Open Circuit
91 & 92 ....(2) Defroster Flap Switchover Valve
93 & 94 ....(2) Defroster Flap Switchover Valve Short/Open Circuit
95 & 96 ....(3) Defroster Flap Switchover Valve
97 & 98 ....(3) Defroster Flap Switchover Valve Short/Open Circuit
99 & 100 ...(2) Footwell Flap Switchover Valve
101 & 102 ..(2) Footwell Flap Switchover Valve Short/Open Circuit
103 & 104 ..(3) Footwell Flap Switchover Valve
105 & 106 ..(3) Footwell Flap Switchover Valve Short/Open Circuit
(1) - Even numbered codes indicate an intermittent malfunction.
(2) - Long (80 percent movement) stroke.
(3) - Short (20 percent movement) stroke.
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READING SENSOR VALUES
1) Turn ignition on. Simultaneously press down and up arrow push buttons until the pre-selected temperature setting of "72 °F" is displayed. Press the AUTO push button.
2) Press REST push button for more than 6 seconds. The display window will alternately show "01" and an in-car temperature of "72 °F", or "LO" if there is an open circuit, or "HI" if there is a short circuit.
3) By pressing the windshield air distribution push button, the next ascending test step is displayed. By pressing the footwell air distribution push button, the next descending test step is displayed. See SENSOR VALUE DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION table. Press REST push button to exit reading sensor values mode.
SENSOR VALUE DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
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Code Cause/Value
01 ............................. In-Car Temperature Sensor
02 ............................ Outside Temperature Sensor
03 ........................ Heater Core Temperature Sensor
05 .................... Evaporator Core Temperature Sensor
06 ................. (1) Engine Coolant Temperature Sensor
07 .............................. (2) Refrigerant Pressure
08 ............................ (3) Blower Control Voltage
09 .......... Software Status Of A/C-Heater Control Module
15 ........................... Selected In-Car Temperature
20 ................................. Software Version Code
21 ...................................... (4) Engine Speed
22 .............................. (5) A/C Compressor Speed
23 ......................................... Vehicle Speed
50 ................................ 80.° - 00.° (Not Used)
51 ......... Number Of Actual Drive Belt Slip Recognitions
52 ......... Number Of Actual Drive Belt Slip Recognitions
(1) - A display of "12.°5" corresponds to 125 Celsius (257°F).
(2) - Refrigerant pressure is displayed in bar. One bar equals 14.5037 psi. A display of "12.°8" corresponds to 12.8 bar (185.6 psi).
(3) - A display of "16.°5" corresponds to 1.65 volts.
(4) - A display of "06.°0" to "70.°0" corresponds to 600 RPM to 7000 RPM respectively.
(5) - A display of "00.°0" to "84.°0" corresponds to 0 RPM to 8400 RPM respectively.
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For clarification this is for this model A/C Pushbutton Unit
[IMG]local://upfiles/5574/2128D765734E4A19B800E5D
#9
07-09-2005, 03:47 AM
RE: 95 c280 problem
Turn the key to the position just before it starts. You know.... when everything is lit up like a Christmas Tree
And yes you have to have the A/C on so you can press the down arrow until it reads "LO" (should be the last seting on the dial) or 72 Degrees, depending upon what test you are running..
That should do the trick!
Hope this helps!
Cheers,
TJ
#10
07-09-2005, 09:18 PM
RE: 95 c280 problem
Still not working for some reason, not sure what's wrong? I have the a/c on lo and press "rest" and "defrost symbol" simultaneously. All to no avail, hmmm....