B2978

DTC B2978 or PaVENT sensor short is indicated: A Short in the Passenger's Vent Air Temperature Sensor Circuit

1. Clear the DTC with the HDS.
2. Turn the ignition switch OFF and then ON (II).
3. Do the self-diagnostic with the HDS or climate control unit.
4. Check for DTCs.

Is DTC B2978 or PaVENT sensor short indicated?

YES - Go to step 5.

NO - Intermittent failure.

5. Turn the ignition switch OFF.
6. Remove the passenger's vent air temperature sensor and test it.

Is the passenger's vent air temperature sensor OK?

YES - Go to step 7.

NO - Replace the passenger's vent air temperature sensor.

7. Disconnect the climate control unit 40P connector.




8. Check for continuity between body ground and the climate control unit 40P connector terminal No. 37.

Is there continuity?

YES - Repair short to body ground in the wire between the climate control unit and the passenger's vent air temperature sensor.

NO - Go to step 9.




9. Check for continuity between the climate control unit 40P connector terminals No. 33 and No. 37.

Is there continuity?

YES - Repair short in the wires between the climate control unit and the passenger's vent air temperature sensor.

NO - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit.