B2970

DTC Troubleshooting: B2970

DTC B2970: Climate Control Unit Lost Communication with Relay Control Module (RM message)

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

1. Clear the DTC with the HDS.

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

3. Wait for 6 seconds or more.

4. Do the self-diagnostic function with the HDS. Initial Inspection and Diagnostic Overview

5. Check the DTCs.

Is DTC B2970 indicated?
YES - Go to step 6.

NO - Intermittent failure, check for a loose wire or poor connection on the climate control unit connector A (40P).


6. Check for DTCs with the HDS.

Are any of the following DTCs indicated; B1005, B1959, B2162 or B1158 indicated?
YES - Do the relay control module input test. Gauge Control Module Input Test

NO - Do the climate control unit troubleshooting. Testing and Inspection