Driver Blend Door Not Responding (ATC)

DRIVER BLEND DOOR NOT RESPONDING (ATC)





For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
With the ignition on.

- Set Condition:
This DTC will set if the Automatic Temperature Control (ATC) does not receive feedback pulses within 60 seconds of the drive voltage being applied.





Diagnostic Test

1. ACTIVE HVAC DTC(S) PRESENT
Turn the ignition on.
Using the scan tool, clear all HVAC DTC's.
Using the A/C Heater Control, operate the Driver Blend Door Actuator.
With the scan tool, check for DTCs.
Does the scan tool display this DTC as active?

Yes

- Go To2

No

- The condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test.

2. DOOR DRIVER CIRCUIT SHORTED HIGH




Turn the ignition off.
Disconnect the Driver Blend Door actuator harness connector.
Disconnect the HVAC Control Head harness connector.
Turn the ignition on.
Measure the voltage between the (C61) Driver Blend Door Driver (A) circuit and ground.
Measure the voltage between the (C161) Driver Blend Door Driver (B) circuit and ground.
Is the voltage above 0.2 volts on either circuit?

Yes

- Repair the Door Driver circuit with voltage above 0.2 volts for a short to voltage.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Go To3

3. DOOR DRIVER CIRCUIT SHORTED LOW




Turn the ignition off.
Measure the resistance between ground and the (C61) Driver Blend Door Driver (A) circuit.
Measure the resistance between ground and the (C161) Driver Blend Door Driver (B) circuit.
Does the ohm meter read open circuit?

Yes

Go To4

No

- Repair the Door Driver circuit with resistance for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

4. (C61) DRIVER BLEND DOOR DRIVER (A) CIRCUIT OPEN




Measure the resistance of the (C61) Driver Blend Door Driver (A) circuit between the HVAC Control Head harness connector and the Driver Blend Door Actuator harness connector.
Does the ohm meter read open circuit?

Yes

- Repair the (C61) Driver Blend Door Driver (A) circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Go To5

5. (C161) DRIVER BLEND DOOR DRIVER (B) CIRCUIT OPEN




Measure the resistance of the (C161) Driver Blend Door Driver (B) circuit between the HVAC Control Head harness connector and the Driver Blend Door Actuator harness connector.
Does the ohm meter read open circuit?

Yes

- Repair the (C161) Driver Blend Door Driver (B) circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Go To6

6. CHECK THE DOOR ACTUATOR'S CIRCUIT RESISTANCE
Measure the resistance between pin 1 and pin 2 at the Driver Blend Door Actuator.
Is the resistance below 30.0 ohms?

Yes

- Replace the Driver Blend Door Actuator.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Replace the Automatic Temperature Control (ATC).
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.