Adaptive Cruise Control/CMBS

Adaptive Cruise Control (ACC) DTC Troubleshooting: 112

DTC 112: Lost Communication with the VSA Modulator-Control Unit

1. Check for VSA system DTCs with the HDS.

Are any DTCs indicated?
YES - Troubleshoot the indicated VSA system DTC(s).

NO - Go to step 2.


2. Clear the DTCs with the HDS.

3. Turn the ignition switch to ON (II) and the adaptive cruise control (ACC) switch ON.

4. Check for DTCs with the HDS.

Is DTC 112 indicated?
YES - Go to step 5.

NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections.


5. Turn the ignition switch to LOCK (0).

6. Disconnect the ACC unit 20P connector.

7. Disconnect the VSA modulator-control unit 47P connector.

8. Check for continuity between ACC unit 20P connector terminal No. 10 and VSA modulator-control unit 47P connector terminal No. 14.

Is there continuity?
YES - Go to step 9.

NO - Repair an open in the wire between the ACC unit and the branch of the F-CAN line (CANH).






9. Check for continuity between ACC unit 20P connector terminal No. 20 and VSA modulator-control unit 47P connector terminal No. 30.

Is there continuity?
YES - Check for loose or poor connections. If OK, replace the ACC unit. Service and Repair

NO - Repair an open in the wire between the ACC unit and the branch of the F-CAN line (CANL).