Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Headlamp Alignment Control Module: Testing and Inspection




Headlight Leveling Control Unit Input Test

1. Turn the ignition switch to LOCK (0).

2. Remove the driver's dashboard undercover, Driver's Dashboard Undercover Removal/Installation and the driver's dashboard lower cover. Driver's Dashboard Lower Cover Removal/Installation

3. Disconnect the 16P connector (A) from the headlight leveling control unit (B).






4. 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 5.

5. With the connector still disconnected, do these input tests at the following 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 6.





6. Reconnect the connector to the control unit, and do these input tests at the following connector.
- If any tests indicates a problem, find and correct the cause, then recheck the system.

- If all the input tests prove OK, replace the headlight leveling control unit.





7. After replacing the control unit, do the headlight initial position learning procedure. Programming and Relearning