Brake Lights Out .... Replace the relay? 2003 Cadillar CTS
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Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, Brake Lights Out .... Replace the relay? 2003 Cadillar CTS in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; None of my brake lights are working. I looked around online and found a few likely causes: BAS relay, brake ...
  1. #1
    tarmacjerry is offline Cadillac Owners Member
    Automobile(s): CTS
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    Brake Lights Out .... Replace the relay? 2003 Cadillar CTS

    None of my brake lights are working. I looked around online and found a few likely causes: BAS relay, brake light relay, brake light switch.

    Where are each of these located? What are each designed to do?

    What does BAS relay stand for?

    Whats the difference between the brake light switch and brake light relay?

    How do I change each?

    Thanks in advance. Long Live Cadillac!

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  3. #2
    ghettomike's Avatar
    ghettomike is offline Cadillac Owners Master
    Automobile(s): 03 CTS 3.2L (Sold) / 09 CBR 600rr /2014 GMC Sierra
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    Re: Brake Lights Out .... Replace the relay? 2003 Cadillar CTS

    when you tap the brake pedal with it in park, do you hear a click?

  4. #3
    tarmacjerry is offline Cadillac Owners Member
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    Thread Starter

    Re: Brake Lights Out .... Replace the relay? 2003 Cadillar CTS

    I do hear a click when I tap the brake pedal. When I press the brake slowly and then release it I can hear two clicks, one from the brake pedal and one that sounds like its coming from the gear shift.

  5. #4
    tarmacjerry is offline Cadillac Owners Member
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    Thread Starter

    Re: Brake Lights Out .... Replace the relay? 2003 Cadillar CTS

    Does anyone know if this is the brake light relay that needs to be replaced?

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