Question about 1989 Cadillac Brougham

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1989 Cadillac rear lights stay on

I have to disconnect the battery in order turn the rear lights off. With the ignition switch off. With the turn signals off. Both rear lights are on. With the left turn signal on: Left rear lights are off. Right rear lights are on. With the right turn signal on: Right rear lights are off. Left rear lights are on. No lights are in front. With the ignition switch in the 1st position, Same as above. With the ignition switch in the second position. Same as above except turn signals blink. Front and back. With the light pull in the first position front and rear fog/parking lights work. With the light pull in the second position. headlights and rear lights working. Brake pedal operates the center back window light but not the rear lights. Emergency flashers work in all key positions. I'd appreciate any ideas. Thanks Jerry

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  • jhill3 Jun 01, 2009

    Thanks honeymokey,



    I looked for the module you mentioned. Before I found it, I pulled the connection on the brake pedal switch. That turned off the brake lights.

    When I reconnected it, everything worked right.

    Probably an intermittent switch problem.

    I'll get it replaced.



    Regards,

    Jerry

  • Richard Scordino May 11, 2010

    Try pulling up with your foot under the brake pedal, if lights go out you have a bad or unadjusted brake light switch.

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It may be a turn hazard module under dash.that is the culprit! The power to the third brake light does not go through the module, but the rear brake lamps power is controlled through this module. I am looking at a drawing of one and it looks like it has two connectors with about five wires in one and six in the other. It has some cooling fins on it also.

Posted on May 31, 2009

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REMOVAL

  1. On models equipped with airbag, disarm airbag as described under MAINTENANCE PROCEDURES/AIRBAG SYSTEM DISARMING.
  2. On all models, disconnect battery ground cable.
  3. Remove ignition switch as described under STARTING AND CHARGING SYSTEMS/COMPONENT REPLACEMENT AND REPAIR PROCEDURES/IGNITION SWITCH.
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  1. On 1989 Accord models, install ignition lock cylinder as follows:
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