B1238
DTC B1238 or DTC indicator N: A Problem in the Passenger's Air Mix Control Linkage, Door, or Motor1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the self-diagnostic or HDS.
Is DTC B1238 or N indicated?
YES - Go to step 4.
NO - Intermittent failure.
4. Turn the ignition switch OFF.
5. Test the passenger's air mix control motor.
Is the passenger's air mix control motor OK?
YES - Go to step 6.
NO - Replace the passenger's air mix control motor, or repair the passenger's air mix control linkage or door.
6. Disconnect the passenger's air mix control motor 5P connector.
7. Disconnect the climate control unit connector B (16P).
8. Check for continuity between the given terminals of climate control unit connector B (16P) and the passenger'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 passenger's air mix control motor.
9. Check for continuity between body ground and climate control unit connector B (16P) terminals No. 7 and No. 8 individually.
Is there continuity?
YES - Repair short to body ground in the wire(s) between the climate control unit and the passenger'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.