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wa0bbi 4/1/2010
2003 Chevrolet S10 ZR5 6 Cyl 4.3L - Brakes
No brake lights: replaced . lamps,all fuses, brake light switch. have , turn and hazard . any sugestions
2 Answers
  • Cubby
    Cubby 4/1/2010
    Have you checked for a ground at both sockets?
  • HouseCallAuto
    HouseCallAuto 4/2/2010
    Here is the deal you can count on..

    Customer Concern: Lower brake lamps are inoperative. Center High Mount Stop Lamp (CHMSL) functions correctly. Rear turn signals function normally. New brake switch tried. No voltage to the Yellow/Black wire with the brakes applied. Tried another CHMSL relay in the Underhood Bussed Electrical Center (UBEC), fixed.
    Tests/Procedures: 1. Test for 12v from the brake switch on the White wire.

    2. Test for 12v at column connector, Yellow/Black wire, pin A10 at C211.

    3. If OK, replace the turn signal switch.

    4. If not OK, test operation of the CHMSL relay in the UBEC.
    Potential Causes: Center High Mounted Stop Lamp (CHMSL) Relay
    Turn Signal Switch


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