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The diagnostics also calibrates the doors and reports door problems.
 

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Yes - ATC.

From FSM:
TROUBLE CODES FROM THE ATC HEAD
The trouble codes can be checked with the ATC control if a DRBIII􏰀 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 (DTC’s).

To place the system into it’s diagnostic mode, press and hold the Floor, Mix and Defrost buttons (at the same time) (Fig. 1). 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). Diag- nostic 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 DRBIII􏰀 scan tool.

41832

41833

41834
 

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IIRC, you'll get code 36 if you have the driver's door open while running the diags.

If that's the only code you got, you'll probably get no codes if re-run with the door closed.
 

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I just did some forum searches on code 36. It also occurs if you disconnected the ATC control unit with battery still connected. Cleared by disconnecting the battery. Disconnect the battery by removing the nut (15mm wrench) and top cable on the negative jump post for 15 or more minutes, then reconnect. Hopefully no more code 36 on diagnostics after that.
 
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