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B1040

B1040-PANEL MODE DOOR 1 CONTROL CIRCUIT/PERFORMANCE (ATC)


B1040-Panel Mode 1 Control Circuit/Performance (ATC):




WHEN MONITORED
When driving the Mode Door Actuator.

SET CONDITION
If the A/C Heater Control fails to detect commutator pulses.

POSSIBLE CAUSES
- Mode door seized, binding, obstructed
- (C66) mode door driver (A) circuit shorted to voltage
- (C266) mode door driver (B) circuit shorted to voltage
- (C66) mode door driver (A) circuit shorted to ground
- (C266) mode door driver (B) circuit shorted to ground
- (C66) mode door driver (A) circuit shorted to other door driver circuit(s)
- (C266) mode door driver (B) circuit shorted to other door driver circuit(s)
- (C66) mode door driver (A) circuit shorted to (C266) mode door driver (B) circuit
- (C66) mode door driver (A) circuit open
- (C266) mode door driver (B) circuit open
- Mode door actuator
- A/C heater control

DIAGNOSTIC TEST

1. RUN ACTUATOR CALIBRATION & THEN CHECK FOR DTCs IN THE A/C HEATER CONTROL
Turn the ignition on.
With the scan tool, select System Tests and then select Actuator Calibration Test. When the test is complete, select View DTCs.

Q: Does the scan tool display: B1044 PANEL MODE DOOR 1 TRAVEL RANGE TOO SMALL?

YES: Diagnose and Repair the DTC. Refer to HVAC related symptoms. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 2

2. CHECK (C66) MODE DOOR DRIVER (A) CIRCUIT FOR A SHORT TO VOLTAGE




Turn the ignition off.
Disconnect the A/C Heater Control C2 harness connector.
Turn the ignition on.
Measure the voltage of the (C66) Mode Door Driver (A) circuit.

Q: Is the voltage above 0.2 volts?

YES: Repair the (C66) Mode Door Driver (A) circuit for a short to voltage. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 3

3. CHECK (C266) MODE DOOR DRIVER (B) CIRCUIT FOR A SHORT TO VOLTAGE




Measure the voltage of the (C266) Mode Door Driver (B) circuit.

Q: Is the voltage above 0.2 volts?

YES: Repair the (C266) Mode Door Driver (B) circuit for a short to voltage. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 4

4. CHECK (C66) MODE DOOR DRIVER (A) CIRCUIT FOR A SHORT TO GROUND




Turn the ignition off.
Measure the resistance of the (C66) Mode Door Driver (A) circuit between ground and the A/C Heater Control C2 harness connector.

Q: Is the resistance below 10k ohms?

YES: Repair the (C66) Mode Door Driver (A) circuit for a short to ground. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 5

5. CHECK (C266) MODE DOOR DRIVER (B) CIRCUIT FOR A SHORT TO GROUND




Measure the resistance of the (C266) Mode Door Driver (B) circuit between ground and the A/C Heater Control C2 harness connector.

Q: Is the resistance below 10k ohms?

YES: Repair the (C266) Mode Door Driver (B) circuit for a short to ground. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 6

6. CHECK (C66) MODE DOOR DRIVER (A) CIRCUIT FOR A SHORT TO OTHER DOOR DRIVER CIRCUIT(S)




Measure the resistance between the (C66) Mode Door Driver (A) circuit and the (C255) Left Blend Door Driver (B) circuit, the (C55) Left Blend Door Driver (A) circuit, the (C252) Right Blend Door Driver (B) circuit, the (C52) Right Blend Door Driver (A) circuit, the (C268) Recirculation Door Driver (B) circuit, and the (C68) Recirculation Door Driver (A) circuit in the A/C Heater Control C2 harness connector.

Q: Is the resistance below 10k ohms between the (C66) Mode Door Driver (A) circuit and any of the other door driver circuits?

YES: Repair the circuits with a resistance below 10k ohms for a short to the (C66) Mode Door Driver (A) circuit. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 7

7. CHECK (C266) MODE DOOR DRIVER (B) CIRCUIT FOR A SHORT TO OTHER DOOR DRIVER CIRCUIT(S)




Measure the resistance between the (C266) Mode Door Driver (B) circuit and the (C255) Left Blend Door Driver (B) circuit, the (C55) Left Blend Door Driver (A) circuit, the (C252) Right Blend Door Driver (B) circuit, the (C52) Right Blend Door Driver (A) circuit, the (C268) Recirculation Door Driver (B) circuit, and the (C68) Recirculation Door Driver (A) circuit in the A/C Heater Control C2 harness connector.

Q: Is the resistance below 10k ohms between the (C266) Mode Door Driver (B) circuit and any of the other door driver circuits?

YES: Repair the circuits with a resistance below 10k ohms for a short to the (C266) Mode Door Driver (B) circuit. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 8

8. CHECK MODE DOOR ACTUATOR CIRCUIT RESISTANCE




Measure the resistance between the (C66) Mode Door Driver (A) circuit and the (C266) Mode Door Driver (B) circuit in the A/C Heater Control C2 harness connector.

Q: What is the resistance?

Below 30 Ohms
Go To 9
Above 70 Ohms
Go To 10
30 to 70 Ohms
Go To 12

9. CHECK (C66) MODE DOOR DRIVER (A) CIRCUIT FOR A SHORT TO (C266) MODE DOOR DRIVER (B) CIRCUIT




Disconnect the Mode Door Actuator harness connector.
Measure the resistance between the (C66) Mode Door Driver (A) circuit and the (C266) Mode Door Driver (B) circuit in the A/C Heater Control C2 harness connector.

Q: Is the resistance below 10k ohms?

YES: Repair the (C66) Mode Door Driver (A) circuit for a short to the (C266) Mode Door Driver (B) circuit. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Replace the Mode Door Actuator. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

10. CHECK (C66) MODE DOOR DRIVER (A) CIRCUIT FOR AN OPEN




Disconnect the Mode Door Actuator harness connector.
Measure the resistance of the (C66) Mode Door Driver (A) circuit between the A/C Heater Control C2 harness connector and the Mode Door Actuator harness connector.

Q: Is the resistance below 5.0 ohms?

YES: Go To 11
NO: Repair the (C66) Mode Door Driver (A) circuit for an open. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

11. CHECK (C266) MODE DOOR DRIVER (B) CIRCUIT FOR AN OPEN




Measure the resistance of the (C266) Mode Door Driver (B) circuit between the A/C Heater Control C2 harness connector and the Mode Door Actuator harness connector.

Q: Is the resistance below 5.0 ohms?

YES: Replace the Mode Door Actuator. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Repair the (C266) Mode Door Driver (B) circuit for an open. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

12. RUN ACTUATOR CALIBRATION & THEN CHECK FOR DTCs IN THE A/C HEATER CONTROL
Reconnect the A/C Heater Control C2 harness connector.
Turn the ignition on.
With the scan tool, select System Tests and then select Actuator Calibration Test. When the test is complete, select View DTCs.

Q: Does the scan tool display: B1040-PANEL MODE DOOR 1 CONTROL CIRCUIT/PERFORMANCE?

YES: Replace the A/C Heater Control. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Using the wiring diagram as a guide inspect the wiring and connectors for a condition causing an intermittent loss of commutator pulses from the Mode Door Actuator. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
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