B2139

DTC Troubleshooting: B2139

DTC B2139:

Headlight Leveling Motor Power Supply Circuit Error

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A Troubleshooting - B-CAN System Diagnosis Test Mode A.

1. Clear the DTCs with the HDS.

2. Turn the ignition switch to LOCK (0) and then back to ON (II).

3. Turn the headlight switch ON.

4. Check for DTCs with the HDS.

Is DTC B2139 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 adaptive front lighting control unit 40P connector.

7. Disconnect the left and right headlight leveling motor 3P connectors.

8. Check for continuity between adaptive front lighting control unit 40P connector terminal No. 1 and body ground.





Is there continuity?

YES -

Repair a short to ground in the wire.�

NO -

Go to step 9.

9. Reconnect the adaptive front lighting control unit 40P connector.

10. Turn the ignition switch to ON (II).

11. Measure the voltage between adaptive front lighting control unit 40P connector terminals No. 1 and No. 30.





Is there about 5 V?

YES -

Do the headlight leveling motor test Headlight Leveling Motor Test (With AFS).�

NO -

Go to step 12.

12. Measure the voltage between body ground and adaptive front lighting control unit 40P connector terminals No. 21 and No. 22 individually.





Is there battery voltage?

YES -

Go to step 13.

NO -

Check the No. 11 (7.5 A) and No. 29 (7.5 A) fuses in the driver's under-dash fuse/relay box. If the fuses are OK, check for an open or high resistance in the wire between the driver's under-dash fuse/relay box and the adaptive front lighting control unit. If one of the fuses is blown, replace the fuse and recheck. If the fuse is blown again, repair a short in the wire between the driver's under-dash fuse/relay box and the adaptive front lighting control unit.�

13. Measure the voltage between body ground and adaptive front lighting control unit 40P connector terminals No. 24 and No. 25 individually.





Is there less than 0.2 V?

YES -

Replace the adaptive front lighting control unit, and do the adaptive front lighting control unit learning procedure Adaptive Front Lighting Control Unit Learning Procedure.�

NO -

Repair poor ground (G401) or an open or high resistance in the wire.�