B2996

DTC Troubleshooting: B2996 (P and AUTO)

DTC B2996 or DTC indicator P and AUTO:

An Open in the Heater Core Temperature Sensor Circuit

1. Clear the DTC with the HDS.

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

3. Do the Self-Diagnostic Function with the HDS or the climate control unit.

4. Check the DTCs.

Is DTC B2996 or P and AUTO indicated?

YES -

Go to step 5.

NO -

Intermittent failure. Check for loose wires or poor connections on the heater core temperature sensor circuit.�

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

6. Remove the heater core temperature sensor Service and Repair, and test it Heater Core Temperature Sensor Test.

Is the heater core temperature sensor OK?

YES -

With the heater core temperature sensor disconnected, go to step 7.

NO -

Replace the heater core temperature sensor.�

7. Disconnect climate control unit connectors A (32P) and B (16P).

8. Check for continuity between climate control unit connector A (32P) terminal No. 19 and heater core temperature sensor 2P connector terminal No. 2.





Is there continuity?

YES -

Go to step 9.

NO -

Repair an open in the wire between the climate control unit and the heater core temperature sensor.�

9. Check for continuity between climate control unit connector B (16P) terminal No. 3 and heater core temperature sensor 2P connector terminal No. 1.





Is there continuity?

YES -

Check for loose wires or poor connections at climate control unit connectors A (32P) and B (16P) and at the heater core 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 Climate Control Unit Removal/Installation.�

NO -

Repair an open in the wire between the climate control unit and the heater core temperature sensor.�