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post #1 of 4 (permalink) Old 09-19-2005, 02:17 PM Thread Starter
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Auto Headlight Mod

Completed the autoheadlight mod with the sunsensor but now the headlights are on anytime the car is on, no matter what position the switch is in. I put my old light switch in and was able to turn the lights off but have not with the new switch. I even unplugged the sunsensor and the headlight switch would not turn the lights off. I have taken the dash back apart twice to ensure all the connections are correct. Now I just wonder if the problem is the headlight switch or a bad sensor? What do you guys think the problem is? BTW thanks in advance for your comments.
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post #2 of 4 (permalink) Old 09-19-2005, 02:38 PM
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I know if the light plug isn't in, the lights are on all the time. I also discovered if the sun sensor isn't inputing, the lights stay on in auto. Sounds like you are unplugged, which means if your plug is inserted, you should check your ground connections.
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post #3 of 4 (permalink) Old 09-19-2005, 02:47 PM
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Just checked the service manual, there is no ground for the light switch just a return to the BCM. Sounds like it may be in the switch.
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post #4 of 4 (permalink) Old 09-19-2005, 04:48 PM
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Sounds like the headlight switch is the culprit. If you're handy with an ohm meter there's a chart in the FSM section 8L that shows what resistance readings you should have for the different switch positions. You also might want to double check the sun sensor connections. It looks like the sun sensor provides a ground to the BCM depending on whether it's active or not. The BCM has overall control of the lights and your original switch seems to work correctly so I don't think it's the BCM.
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