B1235
DTC B1235 or DTC indicator K: A Problem in the Driver's Air Mix Control Linkage, Door, or Motor1. Clear the DTC by turning the ignition switch to LOCK (0), and then to ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the self-diagnosis or HDS.
Is DTC B1235 or K indicated?
YES - Go to step 4.
NO - Intermittent failure.
4. Turn the ignition switch to LOCK (0).
5. Test the driver's air mix control motor.
Is the driver's air mix control motor OK?
YES - Go to step 6.
NO - Replace the driver's air mix control motor, or repair the driver's air mix control linkage or door
6. Disconnect the driver's air mix control motor 5P connector.
7. Disconnect climate control unit connector B (16P).
8. Check for continuity between the following terminals of climate control unit connector B (16P) and the driver's air mix control motor 5P connector.
Is there continuity?
YES - Go to step 9.
NO - Repair open in the wire(s) between the climate control unit and the driver's air mix control motor.
9. Check for continuity between body ground and climate control unit connector B (16P) terminals No. 3 and No. 4 individually.
Is there continuity?
YES - Repair short to body ground in the wire(s) between the climate control unit and the driver's air mix control motor.
NO - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit.