Driver Blend Door Travel Too Small (ATC)

DRIVER BLEND DOOR TRAVEL TOO SMALL (ATC)





For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
With the ignition on.

- Set Condition:
The Automatic Temperature Control (ATC) monitors the door's range of travel during system initialization. If the measured range is less than expected, the DTC will set.





Diagnostic Test

1. DRIVER BLEND DOOR NOT RESPONDING DTC SET
Turn the ignition on.
With the scan tool, read the active ATC DTCs.
Does the scan tool display: DRIVER BLEND DOOR NOT RESPONDING?

Yes

- Diagnose and repair the DTC(s).
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Go To2

2. AUTOMATIC TEMPERATURE CONTROL (ATC)
Turn the ignition off.
Disconnect the Driver Blend Door Actuator harness connector.
Connect a 12-volt Test Light between the Driver Blend Door Actuator harness connector cavities.
Turn the ignition on.
While monitoring the test light, press the DRIVER BLEND mode switch to change the temp setting from low to hi.

NOTE: Observe test light for approximately 30 seconds.

Does the test light start to flash and stay flashing?

Yes

- Go To3

No

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

3. OBSTRUCTED BLEND DOOR
Turn the ignition off.
Remove the Driver Blend Door Actuator from the A/C-Heater Housing assembly.
Rotate the driver blend door from stop to stop. The door should rotate approximately 45 degrees from stop to stop.
Does the driver blend door move smoothly in both directions?

Yes

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

No

- Repair or replace the Driver Blend Door.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.