Panel Mode Door 1 Control Circuit Low (ATC)

B1041-PANEL MODE DOOR 1 CONTROL CIRCUIT LOW (ATC)

B1041-Panel Mode Door 1 Control Circuit Low (ATC):

WHEN MONITORED
When the Actuator DTC Detection Test is executed.

SET CONDITION
If the (C29) Mode Door 1 Driver circuit is shorted to ground.

POSSIBLE CAUSES
- (C29) mode door 1 driver circuit shorted to ground
- (C29) mode door 1 driver circuit shorted to other door driver circuit(s)
- Mode door 1 (floor to panel) actuator
- A/C heater control

Theory Of Operation
The A/C Heater Control drives the Mode Door 1 (Floor to Panel) Actuator via the (C29) Mode Door 1 Driver circuit and the (C807) Common Door Driver 2 circuit. The Mode Door 1 (Floor to Panel) Actuator does not share the (C807) Common Door Driver 2 circuit or its driver inside the A/C Heater Control with any other actuator.

Diagnostic Test

1. CHECK (C29) MODE DOOR 1 DRIVER CIRCUIT FOR A SHORT TO GROUND




Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Measure the resistance of the (C29) Mode Door 1 Driver circuit between ground and the A/C Heater Control C1 harness connector.

Q: Is the resistance below 10k ohms?

YES: Repair the (C29) Mode Door 1 Driver circuit for a short to ground. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 2

2. CHECK (C29) MODE DOOR 1 DRIVER CIRCUIT FOR A SHORT TO OTHER DOOR DRIVER CIRCUITS




Measure the resistance between the (C29) Mode Door 1 Driver circuit and the (C54) Rear Blend Door Driver circuit, the (C808) Common Door Driver 3 circuit, the (C32) Recirculation Door Driver circuit, the (C34) Common Door 1 Driver circuit, the (C154) Rear Common Door Driver circuit, the (C53) Rear Mode Door Driver circuit, the (C801) Mode Door 2 Driver circuit, and the (C61) Front Blend Door Driver circuit in the A/C Heater Control C1 harness connector.

Q: Is the resistance below 10k ohms between the (C29) Mode Door 1 Driver circuit and any of the other door driver circuits?

YES: Repair the circuit(s) with a resistance below 10k ohms for a short to the (C29) Mode Door 1 Driver circuit. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 3

3. CHECK MODE DOOR 1 (FLOOR TO PANEL) ACTUATOR CIRCUIT RESISTANCE




Measure the resistance between the (C29) Mode Door 1 Driver circuit and the (C807) Common Door Driver 2 circuit in the A/C Heater Control C1 harness connector.

Q: Is the resistance below 30 ohms?

YES: Go To 4
NO: Go To 5

4. CHECK (C29) MODE DOOR 1 DRIVER CIRCUIT FOR A SHORT TO (C807) COMMON DOOR DRIVER 2 CIRCUIT




Disconnect the Mode Door 1 (Floor to Panel) Actuator harness connector.
Measure the resistance between the (C29) Mode Door 1 Driver circuit and the (C807) Common Door Driver 2 circuit in the A/C Heater Control C1 harness connector.

Q: Is the resistance below 10k ohms?

YES: Repair the (C29) Mode Door 1 Driver circuit for a short to the (C807) Common Door Driver 2 circuit. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Replace the Mode Door 1 (Floor to Panel) Actuator in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

5. RUN THE ACTUATOR DTC DETECTION TEST
Reconnect the A/C Heater Control C1 harness connector.
Turn the ignition on.
With the scan tool, erase HVAC DTCs.
Turn the ignition off, wait 10 seconds, and then turn the ignition on.
With the scan tool, select System Tests and then select Actuator DTC Detection. When the test is complete, select View DTCs.

Q: Does the scan tool only display: B1041-PANEL MODE DOOR 1 CONTROL CIRCUIT LOW?

YES: Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO, Other DTC(s) Displayed
Diagnose and repair the other DTC(s). If multiple DTCs are present, beginning with the common circuits, diagnose and repair all short high DTCs and then all short low DTCs.
NO, And No Other DTCs Displayed
Using the wiring diagram as a guide, inspect the wiring and connectors for conditions causing an intermittent short. Repair as necessary. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test