DTC U0122-00: Lost Communication With The VSA Modulator-Control Unit (Multipurpose Camera Unit) (V6, 2018-19)
NOTE: Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Adaptive Cruise Control (ACC) and How to Troubleshoot the Collision Mitigation Braking System (CMBS) .
- CAN gateway system DTC check
-1. Turn the vehicle to the ON mode.
- 2. Check for CAN gateway system DTCs with the HDS.
DTC Description DTC U0029-00 CAN Gateway F-CAN ch A Bus Off U0047-00 CAN Gateway F-CAN ch B Bus Off U3000-49 CAN Gateway Internal Failure Is DTC U0029-00, U0047-00, and/or U3000-49 indicated?
YES
Go to the indicated DTCs troubleshooting.
NO
Go to step 2.
- F-CAN circuit communication check
-1. Select the FUNCTION TEST in the CAN gateway with the HDS, then select the F-CAN Bus Connected Unit Check.
F-CAN Bus Connected Unit Check
Which result is indicated?
VSA modulator-control unit (Bus A) is Not Available
Go to step 3.
VSA modulator-control unit (Bus B) is Not Available
Go to step 4.
Multipurpose camera unit (Bus A) is Not Available
Go to step 5.
Multipurpose camera unit and VSA modulator-control unit are Detected
Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting - Refer to: How to Troubleshoot the Adaptive Cruise Control (ACC) or How to Troubleshoot the Collision Mitigation Braking System (CMBS) . 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.
- Open wire check (F-CAN A_L, F-CAN A_H lines)
-1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Disconnect the following connectors.
CAN gateway 16P connector VSA modulator-control unit 38P connector - 3. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode CAN gateway 16P connector: disconnected VSA modulator-control unit 38P connector: disconnected Test point 1 CAN gateway 16P connector No. 11 Test point 2 VSA modulator-control unit 38P connector No. 26 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2018-19) Test point 1 CAN gateway 16P connector No. 3 Test point 2 VSA modulator-control unit 38P connector No. 38 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2018-19) Is there continuity?
YES
Check for loose terminals at the CAN gateway 16P connector and the VSA modulator-control unit 38P connector. If they are OK, update the VSA modulator-control unit if it does not have the latest software - Refer to: VSA Modulator-Control Unit Update (With SH-AWD) or VSA Modulator-Control Unit Update (Without SH-AWD) , then recheck. If the DTC U0122-00 goes away and the VSA modulator-control unit updated, troubleshooting is complete. If DTC U0122-00 is indicated after the VSA modulator-control unit updated, replace the VSA modulator-control unit - Refer to: VSA Modulator-Control Unit Removal and Installation (With SH-AWD) or VSA Modulator-Control Unit Removal and Installation (Without SH-AWD) .
NO
Repair an open in the wire between the CAN gateway and the VSA modulator-control unit.
- Open wire check (F-CAN B_L, F-CAN B_H lines)
-1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Disconnect the following connectors.
CAN gateway 16P connector VSA modulator-control unit 38P connector - 3. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode CAN gateway 16P connector: disconnected VSA modulator-control unit 38P connector: disconnected Test point 1 CAN gateway 16P connector No. 14 Test point 2 VSA modulator-control unit 38P connector No. 20 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2018-19) Test point 1 CAN gateway 16P connector No. 6 Test point 2 VSA modulator-control unit 38P connector No. 31 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2018-19) Is there continuity?
YES
Check for loose terminals at the CAN gateway 16P connector and the VSA modulator-control unit 38P connector. If they are OK, update the VSA modulator-control unit if it does not have the latest software - Refer to: VSA Modulator-Control Unit Update (With SH-AWD) or VSA Modulator-Control Unit Update (Without SH-AWD) , then recheck. If the DTC U0122-00 goes away and the VSA modulator-control unit updated, troubleshooting is complete. If DTC U0122-00 is indicated after the VSA modulator-control unit updated, replace the VSA modulator-control unit - Refer to: VSA Modulator-Control Unit Removal and Installation (With SH-AWD) or VSA Modulator-Control Unit Removal and Installation (Without SH-AWD) .
NO
Repair an open in the wire between the CAN gateway and the VSA modulator-control unit.
- Open wire check (F-CAN A_L, F-CAN A_H lines)
-1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Disconnect the following connectors.
CAN gateway 16P connector Multipurpose camera unit 20P connector - 3. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode CAN gateway 16P connector: disconnected Multipurpose camera unit 20P connector: disconnected Test point 1 CAN gateway 16P connector No. 11 Test point 2 Multipurpose camera unit 20P connector No. 13 - Refer to: Multipurpose Camera Unit Connector for Inputs and Outputs (2018-19) Test point 1 CAN gateway 16P connector No. 3 Test point 2 Multipurpose camera unit 20P connector No. 2 - Refer to: Multipurpose Camera Unit Connector for Inputs and Outputs (2018-19) Is there continuity?
YES
Check for loose terminals in the multipurpose camera unit 20P connector. If the multipurpose camera unit was updated and the symptom/indication is still present, replace the multipurpose camera unit .
NO
Repair an open in the wire between the CAN gateway and the multipurpose camera unit.