Exterior Lighting Test 3A - Auto Headlights Stay On When Engine Is Running & Switch Is In Auto
NOTE:
Perform EXTERIOR LIGHTING TEST 1A
before proceeding with this test. For connector terminal identification, refer to CONNECTOR IDENTIFICATION
. For wiring diagrams, refer to WIRING DIAGRAMS
. After each repair, perform TEST VER-1A
.
CAUTION:
Always turn ignition switch to OFF position prior to disconnecting any module connector. Ensure all connectors are clean and tight.
- Ensure ignition switch and all lights are off. Disconnect auto headlight sensor. Auto headlight sensor is located on center of defroster grille, at base of windshield. Using scan tool in ohmmeter mode, measure resistance at terminal No. 3 (White wire) on auto headlight sensor connector. If resistance is more than 300 ohms, repair open in White wire. If resistance is 300 ohms or less, go to next step.
- Using scan tool in voltmeter mode, measure voltage at terminal No. 4 (Orange/Black wire) on auto headlight sensor connector. If voltage is more than 4 volts, replace auto headlight sensor. If voltage is 4 volts or less, go to next step.
- Using scan tool in voltmeter mode, backprobe terminal No. 9 (Orange/Black wire) on BCM White 24-pin connector. Do not disconnect BCM connector. If voltage is more than 4 volts, repair open in Orange/Black wire. If voltage is 4 volts or less, replace BCM.