Exterior Light Test 1A - Identifying Exterior Lighting System Problems

NOTE: Perform SYMPTOM ID TEST 1A before proceeding with this test. For connector terminal identification, refer to CONNECTOR IDENTIFICATION . For wiring diagrams, refer to WIRING DIAGRAMS . Perform, after each repair, VERIFICATION TEST VER-1A - VERIFICATION PROCEDURE .

CAUTION: Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.

Exterior lighting system consists of headlights (with time delay), parking lights and underhood lights. Identify problems(s) listed in EXTERIOR LIGHT SYSTEM DIAGNOSTIC TEST DIRECTORY table and perform indicated test(s).

NOTE: Headlight time delay will only operate when ignition switch is turned off, while headlights are still on and headlight switch is turned to OFF position within 45 seconds of ignition switch being turned off. Body Control Module (BCM) will provide a 90-second time delay before turning headlights off.

EXTERIOR LIGHT SYSTEM DIAGNOSTIC TEST DIRECTORY

Problem

Perform

Headlights Will Not Turn On

EXTERIOR LIGHT TEST 2A

Headlights Will Not Turn Off

EXTERIOR LIGHT TEST 3A

Parking Lights Will Not Turn On

EXTERIOR LIGHT TEST 4A

Parking Lights Will Not Turn Off

EXTERIOR LIGHT TEST 5A

Fog Lights Will Not Turn On ⁽¹⁾