Question about 1997 Chevrolet Blazer

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Center high-mounted stoplight is not working? Where is the relay?

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  • Master
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The power circuit for the top/center brake light doesn't have a relay in it but has just a fuse and the brake light switch. Check to make sure that fuse #1, 20 amp, marked STOP/HAZ in the fuse panel inside the cab by the dash is good as this powers the center brake light independently of the rest of the brake lights. Also check 15 amp fuse #16 in the same fuse panel just to be sure it is good also. I see a lot of these bulbs burned out so make sure that you've tried a known good bulb if the fuses are all good. Hope this helps and good luck!

Posted on Jul 08, 2010

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  • Master
  • 3,092 Answers

If the two rear brake light are working on each side, then fuse and relay are good, check the bulb.

Posted on Jul 08, 2010

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: High mount stoplight

I, too, have this same problem with my car. All the fuses are fine, and the bulbs are fine. The brake light in the back window works, but the read ones do not. This is crazy.

Posted on Jul 11, 2008

ghost4548
  • 776 Answers

SOURCE: bulb replacement in hyndai sonata high mounted rear stoplight

Research revealed no available illustration of procedure. If memory serves, there are two 'access' plates on either side of the lamp assy (popped out with small screwdriver) and two phillps screws retaining the assy in place. Remove the access plates (plastic) and the screws behind them.. access is gained.

Posted on Jun 28, 2009

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1 Answer

2002 Dodge Grand Caravan. The high mount brake light won't work and neither do the license plate lamps. I've already checked all the fuses and they are good.


If 20A FUSE 26 in the intelligent power module is OK, then the stoplight switch is defective.
If 15A FUSE 2 in the intelligent power module is OK, the front control module could be defective.

Feb 19, 2017 | 2002 Dodge Grand Caravan

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.
  • Lighting control module.
  • GO to Pinpoint Test BA .
  • Stoplamps Inoperative
  • Open fuse.
  • Circuitry.
  • Lighting control module.
  • GO to Pinpoint Test
You may want to take to a repair shop !

PINPOINT TEST BB: STOPLAMPS INOPERATIVE BB1 TEST STOPLAMPS
  • Press stoplight switch.
  • Check stoplamps and rear high mount lamp.
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
  • Connect Rotunda New Generation Star (NGS) Tester 007-00500 or equivalent to data link connector.
  • Enter diagnostic data link.
  • Enter lighting control module.
  • Enter PID/data monitor and record.
  • Select PID: BOO_LCM - Stoplight Switch Status.
  • Hold stoplight switch.
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 .
  • Press stoplight switch.
Is voltage B+ at the switch? Yes No SERVICE Circuit 511 (LG). RETEST system. REPLACE stoplight switch. RETEST system. BB5 TEST POWER TO LIGHTING CONTROL MODULE
  • Disconnect connector C207 from lighting control module.
  • Test for voltage at connector Pin C207 , Circuit 907 (Y/W) and Pin C207 , Circuit 906 (R/O).
Is voltage B+? Yes No GO to BB6 . SERVICE Circuits 906 (R/O) and/or 907 (Y/W). RETEST system. BB6 TEST OUTPUTS
  • Using jumper wires, short Pin C207 , Circuit 907 (Y/W) to Pin C207 , Circuit 9 (LG/O). Using jumper wires, short Pin C207 , Circuit 906 (R/O) to Pin C207 , Circuit 5 (O/LB).
Do stoplamps illuminate? Yes No REPLACE lighting control module. RETEST system. SERVICE Circuits 5 (O/LB) and 9 (LG/O) for open circuit or damaged bulbs. REPLACE open bulbs as necessary. RESTORE vehicle, RETEST. This is Lincoln factory service info !

Jul 04, 2015 | Lincoln Cars & Trucks

1 Answer

I still have not been able to find fuse for brake lights. Looked on back of fuse panel, nothing, found hot wire on brake switch, no power on hot wire, but Haynes manual does not give enough information as...


Not to worry. Power for the stoplight switch comes from 20A fuse 5 in the power distribution center and is applied to the brake lamp switch (confusing, no?). Switch output is connected to a junction block and then to the center high mounted stop lamp. If you press the brake pedal, even with the engine off, the center high mounted stop light should come on.

Sep 21, 2012 | 2001 Dodge Dakota

1 Answer

Is there a fuse or relay or micro relay for the CHMSL on 98 sts


check the lt blue wire at upper lamp,(under trunk lid trim panel) for 12 volts when brake is applied. if no voltage,check same color wire at brake lamp switch for voltage.(by brake pedal).if no voltage replace stop lamp switch asm. if voltage is detected at rear by lamp then replace CHMSL asm.(center high mount stop lamp). this lamp is made of many LED's,if some work and some don't you will need to replace lamp asm. can be repaired by a trained GM tech, possibly. there is no seperate fuse or relay for this lamp,only a stop lamp fuse.

Nov 12, 2011 | 1998 Cadillac Seville

1 Answer

Brake lights don't work how to fix


When a vehicle's brake lights all go out at the same time, the culprit is usually the
"stoplight Switch" which is operated by depressing the brake pedal.

To replace a stoplight switch, first determine what type of switch you have.
If you have an electrical switch mounted to the brake pedal in the passenger compartment:
  • Unscrew the switch.
  • Unplug the wires.
  • Replace with a new switch. Adjust as needed.
  • Plug the wires back in.
If you have a hydraulic pressure switch that is mounted in the brake master cylinder:
  • Mark and disconnect the wires.
  • Unscrew the switch.
  • Screw the replacement switch in.
  • Reconnect the wires
Here's a picture of the "Stoplight Switch", aka Brake Light Switch - 1995 GMC K1500 Sierra

archaeology_14.jpg

Brake lights (stoplights) are activated by a mechanical switch on the brake pedal.
To test a suspected bad stoplight switch, bypass it with a jumper wire. The stoplights should light when the wires are connected. Use the test light to see if there is power at one of the lights.
  • If the lights come on when the wires are connected but not when the brakes are applied, replace the switch.
  • If the stoplights operate without the key on, remove the stoplight fuse before removing the switch.
  • If the new switch is adjustable, adjust it so that it is open when the pedal is released.lights should come on about 1/4" after the pedal is applied.

Feb 20, 2011 | 1995 GMC Sierra

1 Answer

All lights work except stoplights could there be a solenoid for the brakes if so where is it?


brake light sitch on brake pedal may be at fault.the high mounted brake light has a seperate circuit from the regular brake lamps.so if you have no brake lamps the switch contols both circuits.give me a shout back.wish you the best.

Oct 24, 2009 | 2000 Chevrolet Blazer

1 Answer

Were is the rpo relay located . my regular brake light don't turn on. i check light bulb r ok. there is no power to going to the back lights


RPO relay?? no power to rear lights or just brake lights?? is there power at the brake light switch? does the center high mounted brake light work? if the center light works the the switch is good. fuse #13 powers the brake lights (all)

Sep 28, 2009 | 2000 Ford Expedition

1 Answer

2001 Toyota Camry trunk stoplights won't work


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Jan 22, 2009 | 2001 Toyota Camry

1 Answer

Bulb replacement in hyndai sonata high mounted rear stoplight


Research revealed no available illustration of procedure. If memory serves, there are two 'access' plates on either side of the lamp assy (popped out with small screwdriver) and two phillps screws retaining the assy in place. Remove the access plates (plastic) and the screws behind them.. access is gained.

Jan 22, 2009 | 2000 Hyundai Sonata

1 Answer

High mount stoplight


I, too, have this same problem with my car. All the fuses are fine, and the bulbs are fine. The brake light in the back window works, but the read ones do not. This is crazy.

Jul 06, 2008 | 2006 Hyundai Sonata

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