B1178
DTC B1178: F-CAN Communication Line Error1. 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 B1178 indicated?
YES - Go to step 4.
NO - Intermittent failure, the F-CAN 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 ECM/PCM connector E (31P).
7. Disconnect the VSA modulator-control unit 47P connector.
8. Disconnect the TPMS control unit connector B (20P).
9. Check for continuity between body ground and the gauge control module 36P connector terminals No. 28 and No. 29 individually.
Is the continuity?
YES - Repair a short to ground in the wire.
NO - Go to step 10.
10. Turn the ignition ON (II).
11. Measure voltage between body ground and the gauge control module 36P connector terminals No. 28 and No. 29 individually.
Is there 0.5 V or more?
YES - Repair a short to power in the wire.
NO - Go to step 12.
12. Turn the ignition switch OFF.
13. Reconnect the gauge control module 36P connector.
14. Turn the ignition switch ON (II).
15. Clear the DTCs with the HDS.
16. Reconnect the appropriate connector to each control unit in the table one at a time. Wait for 6 seconds, then recheck for DTCs after each unit is reconnected.
Is DTC B1178 indicated with each individual unit reconnected?
YES - Replace the control unit that was reconnected.
NO - Replace the gauge control module.