B2125

DTC B2125: Steering angle sensor signal error

NOTE: Before troubleshooting, check the VSA system DTCs. If the VSA system is OK, do this troubleshooting.

1. Clear the DTCs with the HDS.
2. Turn the ignition switch OFF, and then back ON (II).
3. Turn the headlight switch ON.
4. Turn the steering wheel straight ahead, and keep it in that position.
5. Check for DTCs with the HDS.

Is DTC B2125 indicated?

YES - Go to step 6.

NO - Intermittent failure, the adaptive front lighting system is OK at this time. Check for loose or poor connections at the steering angle sensor connector and at the adaptive front lighting control unit connector.

6. Check the steering angle sensor.

Is the steering angle sensor OK?

YES - Go to step 7.

NO - Faulty steering angle sensor, replace it.

7. Turn the ignition switch OFF.
8. Remove the steering column covers.
9. Disconnect the 5P connector from the steering angle sensor.
10. Disconnect the 40P connector from the adaptive front lighting control unit.




11. Check for continuity between body ground and the steering angle sensor 5P connector terminals No. 2, No. 3, and No. 4 individually.

Is the continuity?

YES - Repair a short in the wire.

NO - Go to step 12.




12. Check for continuity between steering angle sensor 5P connector terminals No. 2 and No. 4 and adaptive front lighting control unit 40P connector terminals No. 18 and No. 38 respectively.

Is there continuity?

YES - Faulty adaptive front lighting control unit, replace it and do the adaptive front lighting control unit learning procedure.

NO - Repair an open in the wire.