72–SHORT TOO COMPLEX (MTC)

For a complete wiring diagram Refer to Section 8W.

Theory of Operation

NOTE: This DTC will display as active if the ignition is not cycled after running the Actuator Circuit Test / Door Calibration Function. Otherwise, it will display as stored until cleared.

• When Monitored:

  When running the Actuator Circuit Test / Door Calibration Function.

• Set Condition:

  If the A/C Heater Control detects more than three door driver circuits shorted in the same direction (e.g. four door driver circuits all shorted to ground) or if two or more door driver circuits are shorted with at least one door driver circuit shorted to voltage and one door driver circuit shorted to ground.

Diagnostic Test

• Repair all circuits with voltage above 0.2 volts for a short to voltage.
• Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

• Go To2

• Repair all circuits with a resistance below 10k ohms for a short to ground.
• Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

• Go To3

• Repair all circuits with a resistance below 10k ohms for a short to the (C266) Front Mode Door Driver circuit.
• Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

• Go To4

• Repair all circuits with a resistance below 10k ohms for a short to the (C66) Front Mode Door Common Driver circuit.
• Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

• Go To5

• Repair all circuits with a resistance below 10k ohms for a short to the (C139) Second Row Mode Door Driver circuit.
• Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

• Go To6

• Repair all circuits with a resistance below 10k ohms for a short to the (C939) Second Row Mode Door Common Driver circuit.
• Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

• Go To7

• Repair all circuits with a resistance below 10k ohms for a short to the (C255) Left Blend Door Driver circuit.
• Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

• Go To8

• Repair all circuits with a resistance below 10k ohms for a short to the (C55) Left Blend Door Common Driver circuit.
• Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

• Go To9

• Go To10

• Go To11

• Repair the (C66) Front Mode Door Common Driver Circuit for a short to the (C266) Front Mode Door Driver circuit.
• Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

• Replace the Front Mode Door Actuator in accordance with the Service Information.
• Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

• Go To12

• Go To13

• Repair the (C939) Second Row Mode Door Common Driver Circuit for a short to the (C139) Second Row Mode Door Driver circuit.
• Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

• Replace the Second Row Mode Door Actuator in accordance with the Service Information.
• Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

• Go To14

• Go To15

• Repair the (C55) Left Blend Door Common Driver Circuit for a short to the (C255) Left Blend Door Driver circuit.
• Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

• Replace the Left Blend Door Actuator in accordance with the Service Information.
• Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

• Go To16

• Go To 17

• Repair the (C68) Recirculation Door Common Driver Circuit for a short to the (C268) Recirculation Door Driver circuit.
• Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

• Replace the Recirculation Door Actuator in accordance with the Service Information.
• Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

• Turn the blower control on.
• Press the A/C mode switch down, turn the blower control to off, wait until both LEDs illuminate (approximately 5 seconds) and then release the A/C mode switch.
• When the A/C status indicator begins displaying DTCs, set the Mode switch to the floor position, simultaneously press the A/C mode switch and the EBL mode switch down until both LEDs start flashing (approximately 5 seconds) and then release the mode switches. Stored DTCs will clear from memory in approximately two seconds.

• Turn the blower control off.
• Press and hold the EBL mode switch down and then turn the blower control on. Continue to hold the EBL mode switch down until the EBL status indicator begins flashing. Then, release the EBL mode switch. While the test / function is running, the EBL status indicator will flash once per second. If the test / function passes, the EBL status indicator will stop flashing. If the test / function fails, the A/C and EBL status indicators will flash alternately. Allow the test / function to run to completion before proceeding.

• Turn the blower control on.
• Press the A/C mode switch down, turn the blower control to off, wait until both LEDs illuminate (approximately 5 seconds) and then release the A/C mode switch.

NOTE: The A/C status indicator displays active DTCs when the EBL status indicator is not illuminated and stored DTCs when the EBL status indicator is illuminated.

• Replace the A/C Heater Control in accordance with the Service Information.
• Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

• Using the wiring diagram as a guide, inspect the wiring and connectors for conditions causing an intermittent short that set the original fault. Repair as necessary. Then, if present, diagnose and repair all other DTCs. Refer to the Table of Contents in this Section for a complete list of HVAC related symptoms.
• Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).