B1154

DTC Troubleshooting: B1154

DTC B1154: Lost Communication UART

1. Clear the DTCs with the HDS.

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

3. Check for DTCs with the HDS.

Is DTC B1154 indicated?
YES - Go to step 4.

NO - Intermittent failure, the UART communication line is OK at this time. Check for loose or poor connections. If the connections are good, check the battery condition, Testing and Inspection and the charging system.


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

5. Disconnect the gauge control module 36P connector.

6. Disconnect the keyless receiver unit 5P connector.

7. Disconnect under-dash fuse/relay box connector K (17P).

8. Check for continuity between body ground and under-dash fuse/relay box connector K (17P) terminals No. 2 and No. 10.

Is there continuity?
YES - Repair a short to ground in the wires.

NO - Go to step 9.






9. Check for continuity between gauge control module 36P connector terminal No. 27 and under-dash fuse/relay box connector K (17P) terminal No. 10.

Is there continuity?
YES - Repair an open in the wire.

NO - Go to step 10.






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

11. Measure the voltage between body ground and under-dash fuse/relay box connector K (17P) terminals No. 2 and No. 10.

Is there 0.1 V or more?
YES - Repair a short to power in the wire.

NO - Substitute a known-good ECM/PCM, and recheck. If DTC B1154 is indicated again, replace the gauge control module.