PaVENT Sensor Open Is Indicated

DTC Troubleshooting: B2977 or PaVENT sensor open is indicated

DTC B2977 or PaVENT sensor open is indicated: An Open in the Passenger's Vent Air Temperature Sensor Circuit

1. Clear the DTC with the HDS.

2. Turn the ignition switch to LOCK (0), and then to ON (II).

3. Do the self-diagnostic with the HDS Initial Inspection and Diagnostic Overview or climate control unit. Initial Inspection and Diagnostic Overview

4. Check for DTCs.

Is DTC B2977 or PaVENT sensor open indicated?
YES - Go to step 5.

NO - Intermittent failure, check for loose wires or poor connections on the passenger's vent air temperature sensor circuit.


5. Turn the ignition switch to LOCK (0).

6. Remove the passenger's vent air temperature sensor Passenger's Vent Air Temperature Sensor Replacement and test it. Vent Air Temperature Sensor Test

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 climate control unit 40P connector terminal No. 37 and passenger's vent air temperature sensor 2P connector terminal No. 1.

Is there continuity?
YES - Go to step 9.

NO - Repair open in the wire between the climate control unit and the passenger's vent air temperature sensor.






9. Check for continuity between climate control unit 40P connector terminal No. 33 and passenger's vent air temperature sensor 2P connector terminal No. 2.

Is there continuity?
YES - Check for loose wires or poor connections at the climate control unit 40P connector and at the passenger's vent air temperature sensor 2P 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.

NO - Repair open in the wire between the climate control unit and the passenger's vent air temperature sensor.