B2139
DTC B2139: Headlight Leveling Motor Power Supply Circuit Error1. Clear the DTCs with the HDS.
2. Turn the ignition switch OFF and then back 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 adaptive front lighting system is OK at this time. Check for loose or poor connections at the headlight leveling motor connector and at the adaptive front lighting control unit connector.
5. Turn the ignition switch OFF.
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 in the wire.
NO - Go to step 9.
9. Reconnect the adaptive front lighting control unit 40P connector.
10. Turn the ignition switch ON (II).
11. Measure voltage between adaptive front lighting control unit 40P connector terminals No. 1 and No. 30.
Is there about 5 V?
YES - Go to the headlight leveling motor test. Headlight Leveling Motor Test
NO - Go to step 12.
12. Measure voltage between body ground and adaptive front lighting control unit 40P connector terminals No. 21 and No. 22 individually.
Is there battery voltage?
YES - Check G401 and ground at terminals No. 24 and No. 25. If OK, replace the faulty adaptive front lighting control unit, and do the adaptive front lighting control unit learning procedure.
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 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 check for a short in the wire between the driver's under-dash fuse/relay box and the adaptive front lighting control unit.