N and AUTO

DTC Troubleshooting: B2968 or Indicator N and AUTO

DTC B2968 or DTC indicator N and AUTO: A Short in the Humidity 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 with the HDS Initial Inspection and Diagnostic Overview or climate control unit. Initial Inspection and Diagnostic Overview

4. Check for DTCs.

Is DTC B2968 or N and AUTO indicated?
YES - Go to step 5.

NO - Intermittent failure. Check for loose wires or poor connections on the humidity sensor circuit.


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

6. Disconnect climate control unit connector A (32P) and B (16P).

7. Disconnect the humidity/in-car temperature sensor 4P connector.

8. Check for continuity between body ground and climate control unit connector A (32P) terminal No. 7, and between climate control unit connector B (16P) terminal No. 1 and body ground.

Is there continuity?
YES - Repair short to body ground in the wire(s) between the climate control unit and the humidity/in-car temperature sensor.

NO - Go to step 9.










9. Check for continuity between terminals of climate control unit connector A (32P) and B (16P) as follows.





Is there continuity between any of the terminals?
YES - Repair the short in the wires.

NO - Go to step 10.


10. Turn the ignition switch to ON (II), and measure the same terminals for voltage between the terminals and body ground.

Is there any voltage?
YES - Repair short to power in the wire(s) between the climate control unit and the humidity/in-car temperature sensor. This short may also damage the climate control unit. Repair the short to power before replacing the climate control unit. Climate Control Unit Removal/Installation

NO - Go to step 11.










11. Reconnect the humidity/in-car temperature sensor 4P connector.

12. Reconnect climate control unit connector A (32P) and B (16P).

13. Test the humidity temperature sensor. Humidity/In-car Temperature Sensor Test

Is the humidity temperature sensor OK?
YES - Substitute a known-good climate control, 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. Service and Repair