B2996
DTC B2996 or DTC indicator U: An Open in the Heater Core Temperature Sensor Circuit1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the HDS or self-diagnostic.
Is DTC B2996 or U indicated?
YES - Go to step 4.
NO - Intermittent failure, check for loose wires or poor connections on the heater core temperature sensor circuit.
4. Turn the ignition switch OFF.
5. Disconnect heater core temperature sensor 2P connector. Check the resistance between heater core temperature sensor 2P connector terminals No. 1 and No. 2.
Is the resistance as specified?
YES - Go to step 6.
NO - Replace the heater core temperature sensor.
6. Disconnect audio-HVAC display panel connector A (22P),
7. Check for continuity between audio-HVAC display panel connector A (22P) terminal No. 21 and heater core temperature sensor 2P connector terminal No. 1.
Is there continuity?
YES - Go to step 8.
NO - Repair open in the wire between the audio-HVAC display panel and the heater core temperature sensor.
8. Check for continuity between audio-HVAC display panel connector A (22P) terminal No. 15 and heater core temperature sensor 2P connector terminal No.2.
Is there continuity?
YES - Check for loose wires or poor connections at audio-HVAC display panel connector A (22P) and at the heater core temperature sensor 2P connector. If the connections are good, substitute a known-good audio-HVAC display panel, and recheck. If the symptom/indication goes away, replace the original audio-HVAC display panel.
NO - Repair open in the wire between the audio-HVAC display panel and the heater core temperature sensor.