Repair an open in the wire between the climate control unit and the in-car temperature sensor.?
9. Check for continuity between climate control unit connector A (40P) terminal No. 8 and humidity/in-car temperature sensor 4P connector
terminal No. 3.
Is there continuity?
YES -
Check for loose wires or poor connections at climate control unit connector A (40P) and at the humidity/in-car temperature sensor 4P 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 between the climate control unit and the in-car temperature sensor.?
A and Mode
DTC Troubleshooting: B1239 (A and MODE)
DTC B1239 or DTC indicator A and MODE:
An Open or Short in the Front Mode Control Motor Circuit
1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then back to ON (II).
3. Do the self-diagnostic function with the HDS or the climate control unit.
4. Check for DTCs.
Is DTC B1239 or A and MODE indicated?
YES -
Go to step 5.
NO -
Intermittent failure, check for loose wires or poor connections in the front mode control motor circuit.?
5. Turn the ignition switch to LOCK (0).
6. Test the front mode control motor See: Heating and Air Conditioning/Testing and Inspection/Component Tests and General
Diagnostics/Front Mode Control Motor Test.
Is the front mode control motor OK?
