DTC 4

DTC 4: An Open in the Rear Air Mix Control Motor Circuit

1. Disconnect the rear air mix control motor 7P connector.
2. Disconnect climate control unit connector A (20P) and B (30P).




3. Check for continuity between following terminals of climate control unit connectors A (20P) and B (30P) and the rear air mix control motor 7P connector.
20P: 7P:
No.1 No.1
No.2 No.2
No.14 No.3

30P: 7P:
No.3 No.5
No.23 No.7

Is there continuity?

YES - Check for loose wires or poor connections at climate control unit connectors A (20P) and B (30P) and at the rear air mix control motor 7P connector. If the connections are good, substitute a known-good rear air mix control motor, and recheck. If the symptom/indication goes away, replace the original rear air mix control motor. If the symptom continues, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit

NO - Repair any open in the wire(s) between the climate control unit and the rear air mix control motor.