Diagnosis And Testing - Headlamp Leveling Switch
To avoid serious or fatal injury on vehicles equipped with airbags, disable the Supplemental Restraint System (SRS) before attempting any steering wheel, steering column, airbag, seat belt tensioner, impact sensor, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the SRS. Failure to take the proper precautions could result in accidental airbag deployment.
The following test applies only to the Right-Hand Drive (RHD) headlamp leveling switch. On Left-Hand Drive models equipped with remote manual headlamp leveling, the switch is integral to the dimmer module. Refer to SWITCH, DIMMER, DIAGNOSIS AND TESTING .
- Remove the headlamp leveling switch from the instrument panel. Refer to SWITCH, HEADLAMP, REMOVAL .
- Disconnect the instrument panel wire harness connector from the back of the headlamp leveling switch.
- Using an ohmmeter, test the resistance between the terminals of the switch as shown in the Headlamp Leveling Switch Tests table.
HEADLAMP LEVELING SWITCH TESTS SWITCH POSITION (PINS) RESISTANCE (OHMS) 0 (1 and 2) 162 ± 1 Percent 1 (1 and 2) 336 ± 2 Percent 2 (1 and 2) 536 ± 3 Percent - If the switch fails any of the tests, replace the ineffective headlamp leveling switch as required.