Manufacturer Code Charts: 112

Adaptive Cruise Control (ACC) DTC Troubleshooting: 112

DTC 112:

Lost Communication With the VSA Modulator-Control Unit

1. Check the VSA indicator on the gauge control module Reading and Clearing Diagnostic Trouble Codes.

Does the VSA indicator stay on?

YES -

Go to step 2.

NO -

Go to step 3.

2. Are there VSA system DTCs? Reading and Clearing Diagnostic Trouble Codes.

Does the HDS communicate with the VSA modulator-control unit?

YES -

Go to step 3.

NO -

Go to the VSA system troubleshooting Reading and Clearing Diagnostic Trouble Codes.

3. Clear the DTCs with the HDS.

4. Press the engine start/stop button to select the ON mode, then wait for 10 seconds.

5. Press the MAIN switch ON.

6. Check for DTCs with the HDS.

Is DTC 112 indicated?

YES -

Go to step 7.

NO -

Intermittent failure, the system is OK at this time. Check for loose or poor connections.

7. Test-drive the vehicle in a straight line, and check all four wheel speed signals (LF WHEEL SPD, RF WHEEL SPD,LR WHEEL SPD,RR WHEEL SPD) in the ACC DATA LIST with the HDS.

Does HDS correspond to the vehicle speed indicated in the gauge control module?

YES -

Go to step 13.

NO -

Go to step 8.

8. Press the engine start/stop button to select the OFF mode.

9. Disconnect the ACC unit 20P connector.

10. Disconnect the VSA modulator-control unit 46P connector.

11. Check for continuity between ACC unit 20P connector terminal No. 7 and VSA modulator-control unit 46P connector terminal No. 22.





Is there continuity?

YES -

Go to step 12.

NO -

Repair an open in the wire between the ACC unit and the branch of the F-CAN B line (F-CAN B H).

12. Check for continuity between ACC unit 20P connector terminal No. 18 and VSA modulator-control unit 46P connector terminal No. 1.





Is there continuity?

YES -

Replace the VSA modulator-control unit Service and Repair.

NO -

Repair an open in the wire between the ACC unit and the branch of the F-CAN B line (F-CAN B L).

13. Press the engine start/stop button to select the OFF mode.

14. Disconnect the ACC unit 20P connector.

15. Disconnect the VSA modulator-control unit 46P connector.

16. Check for continuity between ACC unit 20P connector terminal No. 10 and VSA modulator-control unit 46P connector terminal No. 39.





Is there continuity?

YES -

Go to step 17.

NO -

Repair an open in the wire between the ACC unit and the branch of the F-CAN A line (F-CAN A H).

17. Check for continuity between ACC unit 20P connector terminal No. 20 and VSA modulator-control unit 46P connector terminal No. 38.





Is there continuity?

YES -

Replace the VSA modulator-control unit Service and Repair.

NO -

Repair an open in the wire between the ACC unit and the branch of the F-CAN A line (F-CAN A L).