Inspection Procedure J-13

Headlight and Taillight: When the ignition switch is turned from on to off, the headlights darken significantly.

Daytime Running Light Power Supply Circuit:

TECHNICAL DESCRIPTION (COMMENT)
If the wiring harness between daytime running light-ECU connector (terminal 5) and front-ECU connector (terminal 2) is defective when switching the headlight to high-beam, both the headlight (high-beam) and the headlight (low-beam in a reduced state) light up.

TROUBLESHOOTING HINTS
- The daytime running light-ECU may be defective
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector

DIAGNOSIS

Required Special Tool:
- MB991223: Harness Set







STEP 1. Check front-ECU connector A-10X and daytime running light-ECU connector A-38 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is front-ECU connector A-10X and daytime running light-ECU connector A-38 in good condition?

YES: Go to Step 2.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Verify the headlights shut-down when the ignition switch is turned from on to off.







STEP 2. Check the wiring harness between front-ECU connector A-10X (terminal 2) and daytime running light-ECU connector A-38 (terminal 5).

Q: Is the wiring harness between front-ECU connector A-10X (terminal 2) and daytime running light-ECU connector A-38 (terminal 5) in good condition?

YES: Replace the daytime running light-ECU. The daytime running light function should now work normally.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify the headlights shut-down when the ignition switch is turned from on to off.