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Anonymous asked in Cars & TransportationMaintenance & Repairs · 1 decade ago

We have a 2004 grand prix with no brake lights. Replaced brake switch on pedal no luck. Replacing multifunctio?

switch. And if that doesn't do it then what is next besides BCM. All the bulbs have been replaced as well. Thanks ---Natalie

3 Answers

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  • MasTec 1970
    Lv 7
    1 decade ago
    Favorite Answer

    The first question in this diagnostic tree that has to be asked is does the CHMSL (center high mount stop light) and the turn signals work? And have you had the BCM scanned to see if there any stored DTC's (diagnostic trouble codes)? NOTE: ALL of the exterior lamps on this vehicle are controlled by the BCM without following the diagnostic tree you can chase this problem till next Christmas! Lol

    Source(s): 28 Year Master Technician
  • MixQuisite
    Lv 4
    1 decade ago

    Check for a broken Ground wire First.

  • ?
    Lv 5
    1 decade ago

    The turn signal switch will do that.Start testing before guessing,your just wasting money

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