B1154
DTC B1154: Lost Communication with UART1. Clear the DTCs with the HDS.
2. Turn the ignition switch OFF, and then back 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, and the charging system.
4. Turn the ignition switch OFF.
5. Disconnect the gauge control module 36P connector.
6. Disconnect the keyless receiver unit 5P connector.
7. Disconnect the under-dash fuse/relay box connector K(17P).
8. Check for continuity between body ground and the under-dash fuse/relay box connector K (17P) No. 2 and No. 10 terminals.
Is the continuity?
YES - Repair a short to ground in the wires.
NO - Go to step 9.
9. Check for continuity between the gauge control module 36P connector No. 27 terminal and the under-dash fuse/relay box connector K (17P) No. 10 terminal.
Is the continuity?
YES - Repair an open in the wire.
NO - Go to step 10.
10. Turn the ignition switch ON (II).
11. Measure voltage between body ground and the under-dash fuse/relay box connector K (17P) No. 2 and No. 10 terminals.
Is there 0.5 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.