Brake lights

Tiny
DAVE829
  • MEMBER
  • 2003 JEEP LIBERTY
  • 3.7L
  • 6 CYL
  • 4WD
  • 215,000 MILES
None of the brake lights including the high mount works. All other lights, signals etc work fine. Tested/checked all the fuses, changed the brake switch. Put all the bulbs including the brake lights on a tester and the the lights work in the sockets on the tester. Even went as far as changing out the multi-switch. What am I missing? I put the car itself on a tester and when you press the brake it recognizes the brake switch being activated.
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Saturday, April 15th, 2017 AT 5:02 PM

3 Replies

Tiny
CARADIODOC
  • EXPERT
Check for twelve volts on the pink/light blue wire at the brake light switch. If you have that, check for twelve volts on its white/tan wire when the brake pedal is pressed.
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Saturday, April 15th, 2017 AT 6:32 PM
Tiny
DAVE829
  • MEMBER
Checked both wires and power is present.
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Monday, April 17th, 2017 AT 10:05 AM
Tiny
CARADIODOC
  • EXPERT
From the brake light switch, the white / tan wire goes to the fuse box at the left side of the dash. Current goes through a joint connector, then comes out on a different white / tan wire and goes to the three brake lights. The turn signal switch is not involved because the brake lights and signal lights are different bulbs.

The white / tan wire also leaves the fuse box on a third wire and goes to the Anti-lock Brake Computer, (CAB). If you have a scanner, access that computer and see if it recognizes the brake light switch. If it does not, the problem is inside that fuse box.

If you have voltage leaving the fuse box, (connector 2, terminal 13), the only thing that can be wrong is a break in that wire or a corroded splice. That spice is simply listed as "near the rear power outlet". Any defect after that splice would result in the center-high-mount brake light still working.
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Monday, April 17th, 2017 AT 6:37 PM

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