B2968

DTC Troubleshooting: B2968 (K and AUTO)

DTC B2968 or DTC indicator K and AUTO:

A Short in the Humidity Sensor Circuit

1. Clear the DTCs with the HDS.

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

3. Do the self-diagnostic function with the HDS or the climate control unit.

4. Check for DTCs.

Is DTC B2968 or K and AUTO indicated?

YES -

Go to step 5.

NO -

Intermittent failure, check for loose wires or poor connections in the humidity sensor circuit.

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

6. Disconnect the climate control unit 36P connector.

7. Disconnect the humidity/in-car temperature sensor 4P connector and air mix control motor 7P connector.

8. Check for continuity between body ground and climate control unit 36P connector terminals No. 1, No. 3, and No. 24 individually.





Is there continuity?

YES -

Repair a short to body ground in the wires between the climate control unit and the humidity sensor.

NO -

Go to step 9.

9. Check for continuity between terminals of the climate control unit 36P connector as follows.









Is there continuity between any of the terminals?

YES -

Repair a short in the wires.

NO -

Go to step 10.

10. Turn the ignition switch to ON (II).

11. Measure the voltage between body ground and climate control unit 36P connector terminals No. 1, No. 3, and No. 24 individually.





Is there any voltage?

YES -

Repair a short to power in the wires between the climate control unit and the humidity sensor. This short may also damage the climate control unit. Repair a short to power before replacing the climate control unit.

NO -

Go to step 12.

12. Reconnect the humidity/in-car temperature sensor 4P connector and air mix control motor 7P connector.

13. Reconnect the climate control unit 36P connector.

14. Test the humidity sensor Testing and Inspection.

Is the humidity temperature sensor OK?

YES -

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 -

Replace the humidity/in-car temperature sensor Humidity/In-Car Temperature Sensor Replacement.