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Headlight Leveling System Suspension Stroke Sensor Circuit Troubleshooting

NOTE:
  • Before troubleshooting, check the No. 5 (10 A) fuse in the under-dash fuse/relay box.
  • Before troubleshooting, check for DTCs and make sure the B-CAN communication lines are OK.
  1. Raise the vehicle, make sure it is securely supported.
  1. Disconnect the 3P connector (A) from the front suspension stroke sensor (B).

  1. Disconnect the 3P connector (A) from the rear suspension stroke sensor (B).
  1. Turn the ignition switch to ON (II).
  1. Turn the combination light (headlight) switch ON.

  1. Check for continuity between the front and rear suspension stroke sensors 3P connector No. 3 terminal and body ground individually.
Is there continuity?
YES -
Go to Step 7 .
NO -
Repair open in the wire or poor ground (G301), if the wire is OK, replace the headlight leveling control unit .■

  1. Measure the voltage between the front and rear suspension stroke sensors 3P connector No. 1 terminal 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 front (or rear) suspension stroke sensor. If the wire is OK, replace the front (or rear) suspension stroke sensor .■
  1. Turn the ignition switch to LOCK (0).
  1. Reconnect the 3P connector to each suspension stroke sensor.

  1. Remove the bolt (A) and the front suspension stroke sensor from the lower arm.

  1. Remove the nut (A) and the rear suspension stroke sensor from the lower arm.
  1. Turn the ignition switch to ON (II).

  1. Measure the voltage between the headlight leveling control unit 16P connector No. 4 and No. 6 terminals, and No. 4 and No. 7 terminals 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 connection between the headlight leveling control unit and the front (or rear) suspension stroke sensor, if the connections are OK, replace the front (or rear) suspension stroke sensor .■
NO -
Check for an open or a short in the wire between the headlight leveling control unit and the front (or rear) suspension stroke sensor, if the wires are OK, replace the front (or rear) suspension stroke sensor .■