Headlight Leveling Control Unit Input Test
- Turn the ignition switch to LOCK (0), and remove the glove box (see GLOVE BOX REMOVAL/INSTALLATION ).
- Disconnect the 16P connector (A) from the headlight leveling control unit (B).
- Inspect the connector and socket terminals to be sure they are all making good contact.
- If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
- If the terminals are OK, go to step 4.
- With the connector still disconnected, make these input tests at the connector.
- If any test indicates a problem, find and correct the cause, then recheck the system.
- If all the input tests prove OK, go to step 5.CAVITY AND TEST CONDITION CHART
Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained 15 BLU Ignition switch ON (II), raise the vehicle, make sure it is securely supported, and rotate one of the front wheels slowly with the other wheel blocked. Measure the voltage between the No. 15(+) and No.9(-) terminals:
There should be 0-5 V or more and 0-5 V or more repeatedly.- Faulty PCM
- An open in the wire
- A short to ground in the wire
16 LT BLU Under all conditions Check for continuity between the No. 16 terminal and the Non terminal of the combination switch control unit 8P connector:
There should be continuity.An open in the wire
- Reconnect the connector, turn the ignition switch to ON (II), and make these input tests at the connector.
- If any test indicate a problem, find and correct the cause, then recheck the system.
- If all the input tests prove OK, replace the headlight leveling control unit.NOTE: After replacing the control unit, do the headlight initial position learning procedure (see HEADLIGHT INITIAL POSITION LEARNING PROCEDURE ).CAVITY AND TEST CONDITION CHART
Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained 9 BLK Under all conditions Measure the voltage to ground:
There should be less than 0.5 V.- Poor ground (G401)
- An open in the wire
3 GRN Under all conditions Measure the voltage to ground:
There should be less than 0.5 V.- Poor ground (G401)
- An open in the wire
4 LT GRN 12 BLU 8 RED Under all conditions Measure the voltage to ground:
There should be battery voltage.- Blown No. 3 (10 A) fuse in the main under-hood fuse box
- A short to ground in the wire
1 RED Ignition switch ON (II) Measure the voltage to ground:
There should be battery voltage.- Blown No. 31 (15 A) fuse in the under-dash fuse/relay box
- An open in the wire
2 BLU Ignition switch ON (II), headlight switch ON Measure the voltage between the No. 2 and No. 3 terminals:
There should be battery voltage.- Faulty headlight leveling motor
- An open in the wire
3 GRN 11 BRN Ignition switch ON (II), headlight switch ON Measure the voltage between the No. 11 and No. 3 terminals:
There should be about 2 to 12 V.- Faulty headlight leveling motor
- An open in the wire
3 GRN 6 PUR Under all conditions - Measure the voltage between the No. 13 and No. 12 terminals:
There should be about 5 V.
- Measure the voltage between the No. 6 and No. 12 terminals:
There should be about 0.5 to 4.5 V.
- Faulty left-front suspension stroke sensor
- An open in the wire
12 BLU 13 PNK 4 LT GRN Under all conditions - Measure the voltage between the No. 5 and No. 4 terminals:
There should be about 5 V.
- Measure the voltage between the No. 7 and No. 4 terminals:
There should be about 0.5 to 4.5 V.
- Faulty left-rear suspension stroke sensor
- An open in the wire
5 RED 7 LT BLU