With Autolamps

1. Verify the customer concern by operating the autolamp system to duplicate the condition.

NOTE: If the headlamp switch loses power, the Steering Column/Ignition/Lighting (SCIL) module will automatically default to the autolamp mode. With the ignition switch in RUN, the autolamp function will turn on the exterior lamps and the instrument panel lighting depending on the input of the light sensor amplifier as in normal operation. However, the exit delay will be defaulted to the full three minutes.

2. Inspect to determine if one of the following mechanical or electrical concerns apply:

VISUAL INSPECTION CHART

Mechanical
- Damaged light sensor amplifier
- Damaged headlamp switch

Electrical
- Circuitry open/shorted

3. If the concern remains after the inspection, connect the New Generation STAR (NGS) Tester to the Data Link Connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the NGS menu. If the NGS does not communicate with the vehicle:
- checked that the program card is properly installed.
- check the connections to the vehicle.
- check the ignition switch position.
4. If the NGS still does not communicate with the vehicle, refer to the New Generation STAR Tester manual.
5. Perform the DATA LINK DIAGNOSTIC TEST. If the NGS responds with:

- CKT914, CKT915 or CKT70 = ALL ECUS NO RESP/NOT EQUIP, diagnose Multiplex Communication Network concern.

- NO RESP/NOT EQUIP for SCIL module, go to Pinpoint Test H. Test H: No Communication W/SCIL Module


- SYSTEM PASSED, retrieve and record the continuous Diagnostic Trouble Codes (DTCs), erase the continuous DTCs and perform self-test diagnostics for the SCIL module.

6. If the DTCs retrieved are related to the concern, go to SCIL Diagnostic Trouble Code (DTC) Index to continue diagnostics. SCIL Diagnostic Trouble Code (DTC) Index


7. If no DTCs related to the concern are retrieved, proceed to Symptom Chart to continue diagnostics. Symptom Chart(s)