Lost Communication With A/C

DTC Troubleshooting: U0164

DTC U0164:

Lost Communication With A/C

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A Troubleshooting - B-CAN System Diagnosis Test Mode A.

1. Clear the DTCs with the HDS.

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

3. Wait for at least 6 seconds.

4. Check for DTCs with the HDS.

Is DTC U0164 indicated?

YES -

Go to step 5.

NO -

Intermittent failure, the system is OK at this time. Check for loose or poor connections between the gauge control module and climate control unit or HVAC control unit.�

5. From the BODY ELECTRICAL system select menu, select UNIT INFORMATION, and then select CONNECTED UNITS to see if the climate control unit or HVAC control unit is communicating with the HDS.

Is the climate control unit or HVAC control unit detected?

YES -

Replace the gauge control module Service and Repair.�

NO -

Go to step 6.

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

7. Disconnect the gauge control module 32P connector.

8. Disconnect climate control unit connector A (36P) or HVAC control unit connector A (24P).

9. Check for continuity between gauge control module 32P connector terminals No. 19 and No. 20 and climate control unit connector A (36P) terminals No.36 and No. 35 or HVAC control unit connector A (24P) terminals No. 24 and No. 23 respectively.









Is there continuity?

YES -

Replace the climate control unit Climate Control Unit Removal/Installation or HVAC control unit HVAC Control Unit Removal/Installation.�

NO -

Repair an open or poor connection in the wire between the SRS unit and the gauge control module.�