1995 Chrysler Concorde heater

Tiny
KCIRTAP
  • MEMBER
  • 1995 CHRYSLER CONCORDE
Heater problem
1995 Chrysler Concorde 6 cyl Front Wheel Drive Automatic

heater blower comes on and blows hot air on it's own with iut screen been lit up
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Wednesday, October 27th, 2010 AT 4:19 PM

3 Replies

Tiny
DAVE H
  • EXPERT
Hello. Thanks for the donation. Much appreciated

The Automatic Temperature Control (ATC) system provides for manual or automatic control of passenger compartment air. When automatic mode is selected, system controls blower speed, temperature, and airflow.
Automatic temperature control is canceled when full heat or full cool is selected.
The system has self-diagnostic capabilities and will store trouble codes for later retrieval. Trouble codes can be retrieved using ATC panel or DRB scan tester.

Entering Self-Diagnostics
Set A/C-heater control panel to display degrees Fahrenheit. Start engine (vehicle not moving) and set temperature control to 75 F. To enter self-diagnostic mode, simultaneously press and hold floor, mix, and defrost buttons. When ATC panel display begins to blink, release all 3 buttons.
The display will continue to blink until it completes its tests and calibrations. Any ATC-related diagnostic trouble codes stored in BCM will be displayed when blinking stops. If there are no trouble codes, system will return to normal operation.
Trouble codes will appear on display in numerical form. Only one number will be displayed at a time. Press panel (vent) button to scroll through any additional trouble codes. See DIAGNOSTIC TROUBLE CODES table for list of codes.
NOTE:If in-vehicle temperature sensor is disconnected while it is operating, Code 26 will set and automatic A/C-heater control panel display will go blank. To correct condition, clear Code 26 from BCM.

To exit self-diagnostics, turn ignition off. To clear codes, disconnect negative battery cable for at least 10 minutes.
DIAGNOSTIC TROUBLE CODES
CodeAffected Circuit/Sensor
23 ATC Blend Door Feedback Failure
24 ATC Mode Door Feedback Failure
25 Ambient Temperature Sensor
26 ATC In-Vehicle Temperature Sensor
27 Sun Load Sensor Failure
31 ATC Recirculation Door Stall Failure
32 ATC Blend Door Stall Failure
33 ATC Mode Door Stall Failure
34 Engine Temperature Message Not Received
35 Evaporator Temperature Sensor Failure
36 ATC Panel Communication Failure
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Thursday, October 28th, 2010 AT 4:47 AM
Tiny
KCIRTAP
  • MEMBER
Thanks for your speedy response,

I uploaded code 36 ATC Panel Communication Failure,

Does that mean the ATC is shot.

Thanks again for all your help.
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Thursday, October 28th, 2010 AT 1:00 PM
Tiny
DAVE H
  • EXPERT
Check for loose fitting fuse, damaged wirig and connectors, do the following test's

TEST 4A - ATC HEAD COMMUNICATION FAILURE

1) If this test is being performed because "NO RESPONSE" was displayed on DRB, go to step 3). If this test is being performed for reason other than "NO RESPONSE" message being displayed on DRB, go to next step.
NOTE:A low battery or a momentary bus failure could cause trouble codes observed to set.

2) Record trouble codes and then use DRB to erase all trouble codes. Start engine, turn ATC head on and allow engine to run for at least 2 minutes. Turn engine off, ignition on. Using DRB, read and record BCM trouble codes. If no trouble codes are displayed, system is operating correctly. If IN CAR SENSOR trouble code is displayed, go to TEST 9A. If any of the following trouble codes are displayed, go to step 3):
ATC HEAD CCD COMM FAILURE
ATC HEAD COMM TEST FAILED
ATC HEAD STATUS MESSAGE NOT RECEIVED
STATUS 26 NOT RECEIVED
DIMMING MESSAGE
3) Turn ignition switch off. Locate junction block on left kick panel. Remove and inspect fuse No. 6. If fuse No. 6 is okay, go to step 5). If fuse is blown, using DRB ohmmeter, probe load side of fuse No. 6 (White wire). If resistance is greater than 5 ohms, replace fuse No. 6 and perform VERIFICATION TEST. If resistance is less than 5 ohms, go to next step.
4) Disconnect ATC module 8-pin connector. Ensure connector is clean and not damaged. Using DRB ohmmeter, probe harness connector terminal No. 8 (White wire). If resistance is less than 5 ohms, replace fuse No. 6 and repair short to ground in White wire between fuse No. 6 and ATC module 8-pin connector. If resistance is more than 5 ohms, replace ATC head and fuse No. 6. Perform VERIFICATION TEST.
5) Reinstall fuse No. 6. Turn ignition on, with engine off. Using DRB voltmeter, probe load side of fuse No. 6 (White wire). If voltage is greater than 10 volts, go to next step. If voltage is less than 10 volts, repair open circuit (Black/Orange wire) between fuse No. 6 and ignition switch. Perform VERIFICATION TEST.
6) Disconnect ATC module 8-pin connector. Ensure connector is clean and not damaged. With DRB voltmeter, probe terminal No. 8 (White wire) on ATC module 8-pin connector. If voltage greater than 10 volts, go to next step. If voltage is less than 10 volts, repair open White wire between fuse No. 6 and ATC module 8-pin connector. Perform VERIFICATION TEST.
7) Turn ignition off, close all doors and ensure courtesy lights are all off. Using DRB ohmmeter, probe terminal No. 2 (Black wire) of ATC module 8-pin connector. If resistance is less than 5 ohms, go to next step. If resistance is greater than 5 ohms, repair open Black wire between ATC module 8-pin connector and ground.
8 ) Using DRB ohmmeter, probe terminal No. 7 (Black/Light Green wire) of ATC module 8-pin connector. If resistance is less than 10 ohms, go to next step. If resistance is greater than 10 ohms, repair open Black/Light Green wire between ATC module 8-pin connector and ground.
9) Connect ATC module 8-pin connector. Turn ignition on. Press rear window defroster button. If rear window defroster relay (inside ATC module) clicks, go to next step. If relay does not click, replace ATC module. Perform VERIFICATION TEST.
10) Turn ignition off. Disconnect ATC module 8-pin connector. Connect jumper wire between CCD BUS+ terminal No. 3 (Violet/Brown wire) of ATC module 8-pin connector and ground. Using DRB, check CCD BUS status. If DRB displays "BUS SHORTED TO GROUND", go to next step. If DRB does not display "BUS SHORTED TO GROUND", repair open CCD BUS+ (Violet/Brown wire) circuit.
11) Disconnect jumper wire from CCD BUS+ circuit. Connect jumper wire between CCD BUS- terminal No. 4 (White/Black wire) ATC module 8-pin connector and ground. Using DRB, check CCD BUS status. If DRB does not display "BUS SHORTED TO GROUND", repair open CCD BUS- (White/Black wire) circuit. If DRB displays "BUS SHORTED TO GROUND", replace ATC module.
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Friday, October 29th, 2010 AT 3:19 AM

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