DTC B1178: F-CAN Communication Line Error
- Clear the DTCs with the HDS.
- Turn the ignition switch OFF, and then back ON (II).
- 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 (see BATTERY TEST ), and the charging system.
- Turn the ignition switch OFF.
- Jump the SCS line with the HDS.
- Disconnect the gauge control module 36P connector.
- Disconnect ECM/PCM connector E (31P).
- Disconnect the VSA modulator-control unit 47P connector.
- Disconnect TPMS control unit connector B (20P).
- Check for continuity between body ground and the gauge control module 36P connector terminals No. 28 and No. 29 individually.
Is there continuity?
YES - Repair a short to ground in the wire.
NO - Go to step 11.
- Turn the ignition ON (II).
- 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 13.
- Turn the ignition switch OFF.
- Reconnect the gauge control module 36P connector.
- Turn the ignition switch ON (II).
- Clear the DTCs with the HDS.
- 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.APPROPRIATE CONNECTOR REFERENCE TABLE
Control Unit Appropriate Connector ECM/PCM Connector E (31P) VSA modulator-control unit 47P connector TPMS control unit (1) '07-08 models (2) '09 model Is DTC B1178 indicated with each individual unit reconnected?
YES - Replace the control unit that was reconnected.
NO - Replace the gauge control module.