DTC : U0122-00 (Multipurpose Camera Unit: 6-Speed A/T) (2016 2017 2018)

DTC U0122-00  : Lost Communication With The VSA Modulator-Control Unit

NOTE:  Before you troubleshoot, review the general troubleshooting information - Go to: How to Troubleshoot the Adaptive Cruise Control (ACC) (2016 2017 2018) .

1. Problem verification

   - 1. Turn the vehicle to the ON mode.

   - 2. Clear the DTC with the HDS.

   Clear DTCs

   - 3. Turn the vehicle to the OFF (LOCK) mode.

   - 4. Turn the vehicle to the ON mode, then wait for at least 5 seconds.

   - 5. Check for DTCs with the HDS.

   Is DTC U0122-00 indicated?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Go to intermittent failures troubleshooting - Refer to:How to Troubleshoot the Adaptive Cruise Control (ACC) (2016 2017 2018) . 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_L, F-CAN_H lines)

   - 1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Disconnect the following connectors.

   Multipurpose camera unit 20P connector

   VSA modulator-control unit 38P connector

   - 3. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Multipurpose camera unit 20P connector: disconnected
   	VSA modulator-control unit 38P connector: disconnected
   Test point 1	Multipurpose camera unit 20P connector No. 13 - Refer to: Multipurpose Camera Unit Connector for Inputs and Outputs (20106 2017 2018)
   Test point 2	VSA modulator-control unit 38P connector No. 7 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2016 2017 2018)

   Test point 1	Multipurpose camera unit 20P connector No. 2 - Refer to: Multipurpose Camera Unit Connector for Inputs and Outputs (20106 2017 2018)
   Test point 2	VSA modulator-control unit 38P connector No. 6 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2016 2017 2018)

   Is there continuity?

   YES 

   The F-CAN_L, F-CAN_H wires are OK. Go to step 3.

   NO 

   Repair an open in the wire between the multipurpose camera unit and VSA modulator-control unit.

3. Multipurpose camera unit check (substitution)

   - 1. Reconnect the following connectors.

   Multipurpose camera unit 20P connector

   VSA modulator-control unit 38P connector

   - 2. substitute a known-good Multipurpose Camera Unit .

   - 3. Turn the vehicle to the OFF (LOCK) mode.

   - 4. Turn the vehicle to the ON mode, then wait for at least 5 seconds.

   - 5. Check for DTCs with the HDS.

   Is DTC U0122-00 indicated?

   YES 

   Go to step 4.

   NO 

   Check for loose terminals and poor connections in the multipurpose camera unit 20P connector. If they are OK, replace the Multipurpose Camera Unit .

4. VSA modulator-control unit check (substitution)

   - 1. Substitute a known-good VSA Modulator-Control Unit .

   - 2. Clear the DTC with the HDS.

   Clear DTCs

   - 3. Turn the vehicle to the OFF (LOCK) mode.

   - 4. Turn the vehicle to the ON mode, then wait for at least 5 seconds.

   - 5. Check for DTCs with the HDS.

   Is DTC U0122-00 indicated?

   YES 

   Check for loose terminals and poor connections in the VSA modulator-control unit 38P connector. If they are OK, replace the VSA Modulator-Control Unit .

   NO 

   Troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTC's troubleshooting.