Go to step 5.
NO -
Intermittent failure, check for loose wires or poor connections in the driver's air mix control motor circuit.?
5. Turn the ignition switch to LOCK (0).
6. Test the driver's air mix control motor See: Heating and Air Conditioning/Testing and Inspection/Component Tests and General
Diagnostics/Driver's Air Mix Control Motor Test.
Is the driver's air mix control motor OK?
YES -
Go to step 7.
NO -
Replace the driver's air mix control motor See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/Driver's Air
Mix Control Motor Replacement.?
7. Disconnect the driver's air mix control motor 7P connector.
8. Disconnect climate control unit connector A (40P).
9. Check for continuity between the following terminals of climate control unit connector A (40P) and the driver's air mix control motor 7P
connector.
Is there continuity?
YES -
Check for loose wires or poor connections at climate control unit connector A (40P) and at the driver's air mix control motor 7P connector. If the
connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate
control unit See: Heating and Air Conditioning/Control Assembly/Service and Repair/Climate Control Unit Removal/Installation.?
NO -
Repair an open in the wire(s) between the climate control unit and the driver's air mix control motor.?
B1234
DTC Troubleshooting: B1234 (K and AUTO)
DTC B1234 or DTC indicator K and AUTO:
A Short in the Driver's Air Mix Control Motor Circuit
