DTC Indicator 2
DTC indicator 2: A Short in the Air Mix Control Motor Circuit1. Turn the ignition switch to LOCK (0), and then ON (II).
2. Do the self-diagnostic with the HVAC control unit.
3. Check for DTCs.
Is DTC 2 indicated?
YES - Go to step 4.
NO - Intermittent failure.
4. Turn the ignition switch to LOCK (0).
5. Disconnect the air mix control motor 7P connector.
6. Disconnect the HVAC control unit 28P connector.
7. Check for continuity between body ground and the HVAC control unit 28P connector No. 6 and No. 8 terminals individually.
Is there continuity?
YES - Repair short to body ground in the wire(s) between the HVAC control unit and the air mix control motor.
NO - Go to step 8.
8. Check for continuity between the HVAC control unit 28P connector No. 6 and No. 8 terminals.
Is there continuity?
YES - Repair the short in the wires.
NO - Go to step 9.
9. Turn the ignition switch to ON (II), and check the same terminals for voltage to body ground.
Is there battery voltage?
YES - Repair short to power in the wire(s) between the HVAC control unit and the air mix control motor. This short may also damage the HVAC control unit. Repair the short to power before replacing the HVAC control unit.
NO - Go to step 10.
10. Test the air mix control motor.
Is the air mix control motor OK?
YES - Check the air mix control motor operation with the original HVAC control unit. If the motor operation is no good, substitute a known-good HVAC control unit, and recheck.
If the symptom/indication goes away and the air mix control motor runs, replace the original HVAC control unit.
NO - Replace the air mix control motor.