DTC U0104-00: CAN Communication Failure With Driving Support System Control Unit
NOTE: Before you troubleshoot, review the general troubleshooting information .
| DTC Description | DTC | Freeze Frame |
|---|---|---|
| U0104-00 CAN Communication Failure With Driving Support System Control Unit |
- 1. DTC check:
1. Turn the vehicle to the ON mode.
2. Clear the DTC with the HDS.
3. Turn the vehicle to the OFF (LOCK) mode.
4. Start the engine and let it idle for at least 5 seconds.
5. Check for DTCs with the HDS.
DTC Description DTC Freeze Frame U0029-00 CAN Communication Failure (Bus OFF) U0104-00 CAN Communication Failure With Driving Support System Control Unit Is DTC U0104-00 indicated?
YES
If only DTC U0104-00 is indicated, go to step 2.
YES
If DTC U0029-00 is also indicated, go to DTC U0029-00 .
NO
Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting . If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the Freeze data/on-board snapshot.
- 2. Open wire check (F-CAN A_L, F-CAN A_H lines):
1. Disconnect the following connectors.
VSA modulator-control unit 38P connector Multipurpose camera unit 20P connector 2. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode VSA modulator-control unit 38P connector: disconnected Multipurpose camera unit 20P connector: disconnected Test point 1 VSA modulator-control unit 38P connector No. 26 Test point 2 Multipurpose camera unit 20P connector No. 13 Test point 1 VSA modulator-control unit 38P connector No. 38 Test point 2 Multipurpose camera unit 20P connector No. 2 Is there continuity?
YES
The F-CA_L and F-CAN_H wires are OK. Go to step 3.
NO
Repair an open in the wire between the multipurpose camera unit and the VSA modulator-control unit.
- 3. Multipurpose camera unit check (update or substitution):
1. Reconnect the following connectors.
VSA modulator-control unit 38P connector Multipurpose camera unit 20P connector 2. Update or substitute a known-good multipurpose camera unit .
3. Turn the vehicle to the ON mode.
4. Clear the DTC with the HDS.
5. Turn the vehicle to the OFF (LOCK) mode.
6. Start the engine and let it idle for at least 5 seconds.
7. Check for DTCs with the HDS.
DTC Description DTC Freeze Frame U0104-00 CAN Communication Failure With Driving Support System Control Unit Is DTC U0104-00 indicated?
YES
Go to step 4.
NO
If the multipurpose camera unit was updated, troubleshooting is complete. If the multipurpose camera unit was substituted, replace the original the multipurpose camera unit .
- 4. VSA modulator-control unit check (update):
1. Update the VSA modulator-control unit if it does not have the latest software .
2. Clear the DTC with the HDS.
3. Turn the vehicle to the OFF (LOCK) mode.
4. Start the engine and let it idle for at least 5 seconds.
5. Check for DTCs with the HDS.
Is DTC U0104-00 indicated?
YES
Check for loose terminals in the VSA modulator-control unit 38P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit .
NO
Troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTCs troubleshooting.