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Thanks for help, additional info
Thanks for the help, I have a 98 Olds Aurora. Problem just started today. It does look posessed! I read posts that sometimes the problem was the lamp control module, and others the multi-switch. To troubleshoot, locate the control module (LCM) located on the left side of the instrument panel. It has a 2 connectors 6 pin and 16 pin. Measure voltage on White wire (B1) in reference to ground. This is the control wire from the multi-switch. It should read battery voltage when manual switch is off, and ground when lights turned on manually. ( When connected to LCM, a trouble light to ground on this pin will turn on the headlights, and won't detect problem) If problem is in switch, the voltage should fluctuate as the light flashing problem occurs. If it does not fluctuate, then the problem is most likely the LCM. If it does fluctuate, disconect the 16 pin connector from the LCM, and connect an ohmmeter between the white lead of the wire harness and ground, or a test light between battery and the white lead. To verify proper connection, turn on headlight switch, and the ohmmeter will show a short to ground, or the test light will light. Then turn off headlamp switch, and wait. If it is the switch, you will see the ohmmeter fluctuate, or the test lamp; flash intermittently, as the headlights were doing. My problem was in the switch. I did not have time tonight to clean the switch, as someone had mentioned, but intend to this weekend. For an interim solution, I removed the white wire from pin B1 of the connector, and tapped it back to harness. This pin on it has ground potential when active so it is relatively safe. I never use my manual light switch anyway, I let the light sentinel turn my lights on/off automatically, so I won't miss it. Be cautious, as you will no longer have option to manually turn on your lights if somehow the automatic feature failed, but that would be unlikely. Note, this method still allows the parking lights, and the fog lights to be used normally with manual switches. Note, to remove pin, there are four rows of holes on the LCM side of the connector, I inserted a mini-screwdriver in the hole adjacent to the one with the white wire, and got pin to pop out undamaged.
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