Question about 1992 Chevrolet K1500

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I have a 1992 chevrolet pick up and I have no brake lights, the fuses are fine I have replaced the bulbs and replaced the stoplight switch, and still no brake lights! The weird thing is that I have running lights and the turn signals work. Help please

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  • Master
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I guess I would start by getting a voltmeter and seeing if there is 12 volts on one side or the other at the brakelight switch. If you do not have 12 volts, work back towards the source being battery/alternator.

I do not know what type of bulbs you have, the blade or round socket type but many times I have seen single element bulbs stuck into dual element sockets and vice versa. They are physically the same size, but not electrically. Do not think you can make a mistake with the blade type but I would eliminate that as a possibility.

It used to be common for those long stretches of wire to the rear end to be in a bundle exposed on the underbelly of the vehicle. In northern climes the winter weather would often eat through the wiring causing opens which means no power getting back there. If the wiring is under the body, track it from rear to the front and make sure there are no corroded areas.

Posted on Aug 04, 2010

  • dhellard8 Aug 04, 2010

    I guess it would be a blade bulb 3157LL Question with the voltmeter the plugs that attatch to the stoplight switch is where I test, correct? I really am new at working on cars and trucks. I am going to try looking at the wires and connections

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1 Answer

My running lights are working just fine no brake lights any suggestions? 1999 Lincoln continental


Brake light switch ? Lighting control module , fuse's ?
The stoplight switch is protected by Fuse 32 (15A). This fuse is hot at all times. With the stoplight switch closed, power is provided to the stoplamps through the lighting control module through Circuits 9 (LG/O) and 5 (O/LB). Ground is provided to the stoplamps through Circuit 57 (BK).
Symptom Chart-Stoplamps
Refer to the Electrical and Vacuum Troubleshooting Manual for connector numbers cited in the pinpoint tests. Use Rotunda 88 Digital Multimeter 105-R0053 or equivalent to perform pinpoint tests.
Symptom Chart-Stoplamps Condition Possible Source Action
  • No Communication With Lighting Control Module
  • Circuitry.
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  • GO to Pinpoint Test BA .
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  • Open fuse.
  • Circuitry.
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You may want to take to a repair shop !

PINPOINT TEST BB: STOPLAMPS INOPERATIVE BB1 TEST STOPLAMPS
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Are lamps on? Yes No RELEASE switch and make sure that lamps turn off. CHECK Fuse 32 (15A). REPLACE open fuse if open, RESTORE vehicle, RETEST. If fuse is good, GO to BB2 . BB2 TEST STOPLIGHT SWITCH INPUT
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  • Select PID: BOO_LCM - Stoplight Switch Status.
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Does data display read ON? Yes No GO to BB5 . GO to BB3 . This is with a factory scan tool , a code reader will not work !
BB3 TEST FOR VOLTAGE AT STOPLIGHT SWITCH
  • Test for voltage at input Circuit 10 (LG/R) to stoplight switch connector C253 .
Is B+ present? Yes No GO to BB4 . SERVICE Circuit 10 (LG/R) feeding stoplight switch. RETEST system. BB4 TEST VOLTAGE OUTPUT AT STOPLIGHT SWITCH
  • Test for voltage at output Circuit 511 (LG) of switch connector C253 .
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