B2997
DTC B2997 or DTC indicator V: A Short 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 B2997 or V indicated?
YES - Go to step 4.
NO - Intermittent failure.
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 the audio-HVAC display panel connector A (22P) terminal No. 21 and body ground.
Is there continuity?
YES - Repair short to body ground in the wire between the audio-HVAC display panel and the heater core temperature sensor.
NO - Go to step 8.
8. Check for continuity between audio-HVAC display panel connector A (22P) terminals No. 15 and No.21.
Is there continuity?
YES - Repair short in the wires between the audio-HVAC display panel and the heater core temperature sensor.
NO - Substitute a known-good audio-HVAC display panel, and recheck. If the symptom/indication goes away, replace the original audio-HVAC display panel.