Trouble Codes From The ATC Head
The trouble codes can be checked with the ATC control if a DRBIII(R) scan tool is not available. The control head can only be placed into the diagnostic mode while the engine is running and the vehicle is not moving. Set the control to a 75°F setting (so there is no confusion with the 23-51 Diagnostic Trouble Codes (DTCs). See Figure . To place the system into its diagnostic mode press and hold the FLOOR, MIX and DEFROST buttons (at the same time). The ATC head display will begin to blink. Release the FLOOR, MIX and DEFROST buttons. Once the control head enters the diagnostic mode, the display on the control head will continue to blink. This occurs until it completes its tests and climate control unit door/actuator calibrations. Then it will display any diagnostic trouble codes that are present in the BCM. If there are no diagnostic trouble codes, the system will return to its normal operation as indicated by the temperature symbol (C° or F°). Diagnostic trouble codes related to the ATC and climate control unit will appear on the display in numerical form. The diagnostic trouble codes are stored in the BCM and can range between 23 and 51. The ATC control can only show one diagnostic trouble code at a time. Under certain circumstances, more than one diagnostic trouble code could be in the memory. To scroll through any additional diagnostic trouble codes, press the PANEL mode button on the ATC control. It is important that no other knob or button is pushed until all codes are read. Pushing any button except PANEL mode or turning a knob will end the diagnostic test without showing the rest of the trouble codes. There also may be other trouble codes stored in the BCM not related to the climate control system. These codes can only be found using the DBIII(R) scan tool.
| DTC | Fault | ||||
|---|---|---|---|---|---|
| 23 (1) |
Blend Air Door Actuator Feedback Failure | ||||
| 24 (1) |
Mode Door Actuator Feedback Failure | ||||
| 25 (1) |
Ambient Sensor | ||||
| 26 (1) |
ATC In-Car Temperature Thermistor Failure | ||||
| 27 (1) |
ATC In-Car Sensor Failure | ||||
| 31 (1) |
Recirculation Door Actuator Stall Failure | ||||
| 32 (1) |
Blend Air Door Actuator Stall Failure | ||||
| 33 (1) |
Mode Door Actuator Stall Failure | ||||
| 34 (1) |
Engine Temperature Message Not Received | ||||
| 35 (1) |
Evaporator Sensor Failure | ||||
| 36 (1) |
ATC Control Communication Failure | ||||
| 37 (1) |
Blend Air Door Actuator Output Shorted To Battery | ||||
| 38 (1) |
Blend Air Door Actuator Output Shorted To Ground | ||||
| 39 (1) |
Mode Door Actuator Output Shorted To Battery | ||||
| 40 (1) |
Mode Door Actuator Output Shorted To Ground | ||||
| 41 (1) |
Recirculation Door Actuator Output Shorted To Battery | ||||
| 42 (1) |
Recirculation Door Actuator Output Shorted To Ground | ||||
| 43 (1) |
Common Door Actuator Output Shorted To Battery | ||||
| 44 (1) |
Common Door Actuator Output Shorted To Ground | ||||
| 51 (1) |
System Voltage Too Low For Door Calibration | ||||
| (2) | ATC A/C Switch Failure | ||||
| (2) | ATC Auto Switch Failure | ||||
| (2) | ATC Bi-level Switch Failure | ||||
| (2) | ATC Defrost Switch Failure | ||||
| (2) | ATC EBL Switch Failure | ||||
| (2) | ATC Floor Switch Failure | ||||
| (2) | ATC Mix Switch Failure | ||||
| (2) | ATC Off Switch Failure | ||||
| (2) | ATC Panel Switch Failure | ||||
| (2) | ATC Recirculation Switch failure | ||||
| (2) | ATC Temperature Down Switch Failure | ||||
| (2) | ATC Temperature Up Switch Failure | ||||
| (2) | Blend Door Feedback Failure | ||||
| (2) | Blend Door Output Shorts To Battery | ||||
| (2) | Blend Door Output Shorted To Ground | ||||
| (2) | Blend Door Stall Test Failure | ||||
| (2) | Common Output Shorted To Battery | ||||
| (2) | Common Output Shorted To Ground | ||||
| (2) | Evaporator Temperature Sensor Failure | ||||
| (2) | Head Status RX Failure | ||||
| (2) | In-Car Temperature Sensor Failure | ||||
| (2) | Mode Door Feedback Failure | ||||
| (2) | Mode Door Output Shorted To Battery | ||||
| (2) | Mode Door Output Shorted To ground | ||||
| (2) | Mode Door Stall Test Failure | ||||
| (2) | RECIRC Door Output Shorted To Battery | ||||
| (2) | RECIRC Door Output Shorted To Ground | ||||
| (2) | Recirculation Door Test Failure (Inoperative Or Stall) | ||||
| (2) | Sun Load Sensor Failure | ||||
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