Repair an open in the wire(s) between the climate control unit and the front mode control motor.?
10. Check for continuity between body ground and climate control unit connector A (40P) terminals No. 16 and No. 17 individually.
Is there continuity?
YES -
Repair a short to body ground in the wire(s) between the climate control unit and the front mode control motor.?
NO -
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.?
Open
DTC Troubleshooting: B2979 (B and WINDSHIELD DEFROST)
DTC B2979 or DTC indicator B and WINDSHIELD DEFROST:
An Open in the A/C Pressure Sensor 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 B2979 or B and WINDSHIELD DEFROST indicated?
YES -
Go to step 5.
NO -
Intermittent failure, check for loose wires or poor connections in the A/C pressure sensor circuit.?
5. Turn the ignition switch to LOCK (0).
6. Disconnect the A/C pressure sensor 3P connector.
7. Disconnect climate control unit connector A (40P).
8. Check for continuity between the following terminals of climate control unit connector A (40P) and the A/C pressure sensor 3P connector.
