Headlight Leveling System Suspension Stroke Sensor Circuit Troubleshooting

Headlight Leveling System Suspension Stroke Sensor Circuit Troubleshooting

NOTE: Before troubleshooting, check the No. 31 (15 A) fuse in the under-dash fuse/relay box. Check the active damper system for DTCs and troubleshoot those codes first.

1. Raise the vehicle, make sure it is securely supported.

2. Disconnect the 3P connector (A) from the left-front stroke sensor (B).






3. Disconnect the 3P connector (A) from the left-rear stroke sensor (B).

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

5. Turn the combination light (headlight) switch ON.






6. Check for continuity between the left-front and left-rear suspension stroke sensors 3P connector terminal No. 3 and body ground individually.

Is there continuity?
YES - Go to step 7.

NO - Repair open in the wire or poor ground (G401), if the wire is OK, replace the headlight leveling control unit.






7. Measure the voltage between the left-front and left-rear suspension stroke sensor 3P connector terminal No. 1 and body ground individually.

Is there about 5 V?
YES - Go to step 8.

NO - Check for an open or a short in the wire between the headlight leveling control unit and the left-front (or left-rear) suspension stroke sensor. If the wire is OK, replace the left-front (or left-rear) suspension stroke sensor.






8. Remove the nut (A) and the left-front suspension stroke sensor from the suspension side.






9. Remove the nut (A) and the left-rear suspension stroke sensor from the suspension side.

10. Reconnect the 3P connector to each suspension stroke sensor.






11. Measure the voltage between the headlight leveling control unit 16P connector terminals No. 4 and No. 7, and terminals No. 6 and No. 12 while the suspension stroke sensor arm (A) is moved.

Is there about 0.5-4.5 V?
YES - Intermittent failure, the system is OK at this time. Check for loose or poor connections between the headlight leveling control unit and the left-front (or left-rear) suspension stroke sensor, if the connections are OK, replace the left-front (or left-rear) suspension stroke sensor.

NO - Check for an open or a short in the wire between the headlight leveling control unit and the left-front (or left-rear) suspension stroke sensor, if the wire is OK, replace the left-front (or left-rear) suspension stroke sensor.