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*03 SJC8AH6K733000Y1235FAAT00 − − − − − − YES NO YES NO YES NO DTC B1235 or DTC indicator 3: 21-28 21-28 Heating/Air Conditioning DTC Troubleshooting (cont’d) HVAC CONTROL UNIT 30P CONNECTOR GRY PNK/BLK 10. Turn the ignition switch ON (II), and check the same terminals for voltage to body ground. Repair short to power in the wire(s) between the HVAC control unit and the air mix control motor. Substitute a known-good HVAC control unit, and recheck. If the symptom/indication goes away, 1. Clear the DTC with the HDS. 2. Operate the heater-A/C control system in several modes. 3. Check for DTCs using the HDS or self-diagnostic. Go to step 4. Intermittent failure, check for loose wires or poor connections on the air mix control motor 4. Turn the ignition switch OFF. 5. Test the air mix control motor (see page 21-55). Go to step 6. Replace the air mix control motor (see page 21-55), or repair the air mix control linkage or 6. Disconnect the air mix control motor 7P connector. 7. Disconnect HVAC control unit 30P connector. A Problem in the Air Mix Control Linkage, Door, or Motor Wire side of female terminals Is ther e voltage? Is DT C B1235 or 3 indicated? Is the air mix contr ol motor OK ? |