Headlight Leveling Motor Test

NOTE: Before testing, check the No. 11(7.5 A) and No. 29 (7.5 A) fuses in the driver's under-dash fuse/relay box.

Disconnect the 3P connector (A) from the headlight leveling motor (B).

Fig 1: Disconnecting 3P Connector From Headlight Leveling Motor
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check for continuity between headlight leveling motor 3P connector terminal No. 3 and body ground.
There should be less than 0.2 V
- If there is continuity, go to step 3.
- If there is no continuity, check for:
- Faulty headlight leveling control unit.
- An open or high resistance in the wire between the adaptive front lighting control unit and headlight leveling motor.
- Poor ground (G401).
Turn the ignition switch to ON (II).
Measure the voltage between headlight leveling motor 3P connector terminal No. 1 and body ground. There should be battery voltage.
- If there is battery voltage, go to step 5.
- If there is no voltage, check for:
- Faulty headlight leveling control unit.
- An open or high resistance in the wire between the adaptive front lighting control unit and headlight leveling motor.
Turn the headlight switch ON.
Measure the voltage between headlight leveling motor 3P connector terminal No. 2 and body ground.

There should be about 2-12 V.

NOTE: The voltage will vary depending on the vehicle position.

If there is battery voltage, replace the headlight leveling motor (see HEADLIGHT LEVELING MOTOR REPLACEMENT ).
If there is no voltage, check for:

Faulty headlight leveling control unit.
An open or high resistance in the wire between the adaptive front lighting control unit and headlight leveling motor.