Technical Description (Comment)
Current trouble
- Connector(s) or wiring harness in the CAN bus lines between the hands free module and the A/C-ECU, the power supply system to the hands free module, the hands free module itself, or the A/C-ECU may be defective.
Past trouble
- If DTC U0151 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) in the CAN bus line between the A/C-ECU and the hands free module, and the power supply system to the hands free module. If the connectors and wiring are normal, and obviously the ECU is the cause of the trouble, replace the ECU. If in doubt, do not replace the ECU.
NOTE:
For a past trouble, you cannot find it by the scan tool CAN bus diagnostics even if there is a failure in CAN bus lines. In this case, refer to
HOW TO COPE WITH INTERMITTENT MALFUNCTIONS
) and check the CAN bus lines. You can narrow down the possible cause of the trouble by referring to the DTC, which is set regarding the CAN communication-linked ECUs (Refer to
EXPLANATION ABOUT THE SCAN TOOL CAN BUS DIAGNOSTICS
).