DTC 3: A Problem in the Air Mix Control Motor Circuit, Linkage, Door, or Motor
- 1. Problem verification:
1. Turn the vehicle to the OFF (LOCK) mode and then the ON mode.
2. Do the Self-Diagnostic Function with the HVAC control unit .
3. Check for DTCs.
Is DTC 3 indicated?
YES
Go to step 2.
NO
Intermittent failure. Check for loose wires or poor connections on the air mix control motor circuit.
- 2. Open wire check (M-HOT DR/M-HOT line):
1. Turn the vehicle to the OFF (LOCK) mode.
2. Disconnect the following connectors.
HVAC control unit 32P connector Air mix control motor 7P connector 3. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode HVAC control unit 32P connector: disconnected Air mix control motor 7P connector: disconnected Test point 1 HVAC control unit 32P connector No. 27 Test point 2 Air mix control motor 7P connector No. 7 Is there continuity?
YES
The M-HOT DR/M-HOT wire is not open. Go to step 3.
NO
Repair an open in the wire between the HVAC control unit and the air mix control motor.
- 3. Open wire check (M-COOL DR/M-COOL line):
1. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode HVAC control unit 32P connector: disconnected Air mix control motor 7P connector: disconnected Test point 1 HVAC control unit 32P connector No. 28 Test point 2 Air mix control motor 7P connector No. 6 Is there continuity?
YES
The M-COOL DR/M-COOL wire is not open. Go to step 4.
NO
Repair an open in the wire between the HVAC control unit and the air mix control motor.
- 4. Shorted wire check (M-HOT DR/M-HOT line):
1. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode HVAC control unit 32P connector: disconnected Air mix control motor 7P connector: disconnected Test point 1 HVAC control unit 32P connector No. 27 Test point 2 Body ground Is there continuity?
YES
Repair a short to ground in the wire between the HVAC control unit and the air mix control motor.
NO
The M-HOT DR/M-HOT wire is OK. Go to step 5.
- 5. Shorted wire check (M-COOL DR/M-COOL line):
1. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode HVAC control unit 32P connector: disconnected Air mix control motor 7P connector: disconnected Test point 1 HVAC control unit 32P connector No. 28 Test point 2 Body ground Is there continuity?
YES
Repair a short to ground in the wire between the HVAC control unit and the air mix control motor.
NO
The M-COOL DR/M-COOL wire is OK. Go to step 6.
- 6. Air mix control motor check:
1. Test the air mix control motor - Refer to: Passenger's Air Mix Control Motor TestAir Mix Control Motor Test .
Is the air mix control motor OK?
YES
Replace the HVAC control unit .
NO
Replace the air mix control motor - Refer to: Passenger's Air Mix Control Motor Removal and InstallationAir Mix Control Motor Removal and Installation , or repair the air mix control linkage or door.
