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Panel Mode Door 1 Control Circuit Low (Single-Zone)

B1041-PANEL MODE DOOR 1 CONTROL CIRCUIT LOW (SINGLE-ZONE)


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






Theory of Operation
The A/C Heater Control drives the Mode Door 1 (Panel to Floor) Actuator via the (C29) Mode Door 1 Driver circuit and the (C34) Common Door Driver circuit. All of the door actuators share the (C34) Common Door Driver circuit. Inside the A/C Heater Control, each door actuator has its own unique driver, but all share a single common door driver circuit. Due to the shared circuitry similar DTCs can set at the same time for multiple actuators depending upon the type of short, its location, and the direction the actuator is moving when the short is present.

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 (panel to floor) actuator
- A/C heater control

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 (C61) Blend Door Driver circuit, the (C801) Mode Door 2 Driver circuit, and the (C32) Recirculation 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 (PANEL TO FLOOR) ACTUATOR CIRCUIT RESISTANCE




Measure the resistance between the (C29) Mode Door 1 Driver circuit and the (C34) Common Door Driver 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 (C34) COMMON DOOR DRIVER CIRCUIT




Disconnect the Mode Door 1 (Panel to Floor) Actuator harness connector.
Measure the resistance between the (C29) Mode Door 1 Driver circuit and the (C34) Common Door Driver 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 (C34) Common Door Driver circuit.
Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Replace the Mode Door 1 (Panel to Floor) Actuator.
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.
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.
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 circuit, diagnose and repair all short high DTCs and then all short low DTCs. Refer to Trouble Code Diagnostic Charts for a complete list of HVAC related symptoms.

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
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