Question about Gibson 1995-1998 Toyota T-100 3.4 4WD Short Bed 2.5" Performance Cat-B

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1995 t-100 brake lights not working

How do you test the 4 wire brake switch

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Brake light wont work. Both switches ok. Glob ok checked earth straps ok .??????


The best way to troubleshoot this is with a multimeter or test light. If you have a test light, you connect one end to the battery negative, and then progressively work along the wiring until you find the fault. You need to have the brake pedal pressed down so the brake light switch is turned on. Some cars have the brake light switch in the positive wire, and some in the negative wire so you will have to work this out with your test light.

May 23, 2016 | Cars & Trucks

1 Answer

1999 nissan pathfinder brakes lights stays lit when ignition switch is turned off


the brake light switch will work without the key in the ignition if you push on the brake pedal, its just the way its designed. if you were to test the switch with a test light one wire is always powered up and the second wire is only powered when the brake pedal is pushes to activate the switch. if you test both wires without pushing the pedal I think you will find you have power on both wires indicating the brake switch has shorted and is working all the time. replace the brake switch.

Aug 22, 2014 | 1999 Nissan Pathfinder

1 Answer

1986 dodge 3/4 four wheel no brake lights have turn signals running lights power to the switch and new bulbs


Turn signal and brake lights operate from a different switch. The brake light switch is under the dash behind the brake pedal. Look under the dash and follow the brake pedal up until you see a switch which the pedal operates. Normally a white plastic switch with two wires. Disconnect the two wires and touch them together. If brake lights come on replace the switch. If not use a 12 volt test light to see if there is current to one of the wires. If not, check for a blown fuse. This should solve your problem. If not, contact me for further information,

Feb 26, 2014 | 1986 Dodge Ramcharger

1 Answer

Chevy cavalier - rear brake lights don't work. The center rear brake light does work as well as all other lights. Replaced the bulbs and fuse - no luck. From what I have been told, the turn signal...


Stop Lamp Circuit Description
The STOP HAZ fuse in the IP junction block supplies battery positive voltage to the normally open stop lamp switch. When the driver presses the brake pedal, the switch contacts close and battery positive voltage is supplied to the center mounted stop lamp (CHMSL) and both left and right stop lamp assemblies. The left stop lamp is grounded at G304 and the right stop lamp is grounded at G304.

Check the ground ! Testing an not guessing is the way to find the problem . Do you know how to test automotive electrical systems an circuits using a DVOM - digital volt ohm meter ? How to use an read a wiring diagram to pin point testing areas in a wiring harness ?
Basic Electricity for Service Techs Ohm law Current Flow Opens Shorts
How to Use Multimeter to Troubleshoot Common Problems
Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia

Stop Lamps Inoperative
Step
Action
Yes
No

2
Inspect the 20 Amp STOP HAZ fuse.
Is the STOP HAZ fuse open?
YES - Go to Step 11
NO - Go to Step 3
3
Use a test lamp in order to backprobe connector C1 of the brake switch connector between terminal A and ground. Refer to Circuit Testing in Wiring Systems.
Does the test lamp light?
YES - Go to Step 4
NO - Go to Step 5
4
With the brake switch closed, Test for positive battery voltage at terminal B of connector C1. Refer to Circuit Testing in Wiring Systems.
Is voltage present?
YES - Go to Step 6
NO - Go to Step 7
5
Repair the open or short to ground in the Fuse Output-Battery between the fuse block and the brake switch. Refer to Wiring Repairs in Wiring Systems.
Is the repair complete?
YES - System OK
--
6
Use a test lamp in order to backprobe the turn/hazard headlamp switch assembly connector C2 terminal A and ground.
Depress the brake pedal.
Does the test lamp light?
YES - Go to Step 8
NO - Go to Step 9
7
Inspect the adjustment of the brake switch. If the adjustment is correct, replace the brake switch.
Is the repair complete?
YES - System OK
--
8
Replace the turn/hazard headlamp switch assembly.
Is the repair complete?
System OK
--
9
Repair the open in Stop Lamp Switch Output between the brake switch and the turn/hazard headlamp switch assembly. Refer to Wiring Repairs in Wiring Systems.
Is the repair complete?
System OK
--
10
With brake switch open test terminal A of the brake switch for continuity to ground. Refer to Circuit Testing in Wiring Systems.
Is ground present?
YES - Go to Step 11
NO - Go to Step 12
11
Repair short to ground in Fuse Output-Battery Circuit. Refer to Wiring Repairs in Wiring Systems.
Is repair complete?
System OK
--
12
Test the Stop Lamp Switch Output Circuit for continuity to ground. Refer to Circuit Testing in Wiring Systems.
Is ground present?
YES - Go to Step 13
NO - Go to Step 14
13
Repair short to ground in the Stop Lamp Switch Output Circuit. Refer to Wiring Repairs in Wiring Systems.
Is repair complete?
System OK
--
14
Test terminals F,G,B and C on the Hazard Warning Switch for continuity to ground. Refer to Circuit Testing in Wiring Systems.
Is ground present?
Go to Step 15
--
15
Repair short to ground in suspect CKT. Refer to Wiring Repairs in Wiring Systems.
Is repair complete?
System OK
--


Jul 03, 2017 | 2000 Chevrolet Cavalier

1 Answer

No brake light or blinkers.


you've lost power to your rear wire harness.
use a test light.
1.check test light at battery first to make sure the test light works(test).
2.remove seat and find each wire going to the rear section of the bike.
it should be a plug in type connector, I believe its a 5 wire connector.
3.unplugg this connection and test the side coming from the front of the bike.
to test it, turn ignition on. hold tester to one wire at a time. When test light comes on, that
is your power wire. note the color.
this power wire is for your tail/tag/and or any running lights

turn left blinker on, then hold tester to other wires to see which one blinks. note the color.

turn right blinker on, then hold the tester to wires to see which one blinks.note the color.

step on brake pedal, then hold the tester to wires to see which one comes on and stays
on until you release the brake. this is your brake light wire only and comes from a brake
pressure switch.
the brake switch should have constant power to one side always. when you apply the brakes
the pressure in the switch make contact to other side of switch which sends power to your
brake light. note the color

the wires running under the fender make be broken from scrubbng the tire.
fix the wires or replace them.

4. if you had no power at all, then check your battery is fully charged
5. if no power with a good battery, check fuses.
6. if no power with a good battery and good fuses, then you'll have to trace the wires in the wire
harness to find where the break is.
7. to test any ground wires, simply reverse the connection on the test light.
hook the clamp to the positive side of the battery.
Now test any ground, by touching the tester to it, even the engine and frame should be
grounded and make the test light come on.

As a mechanic, i know time is important, and this test will only take approx and hour or less to perform.
i am color blind and i have to test every wire all the time to make sure i know which wire is which.
once i find it i label it.
works for me everytime.
takes longer to find it then to fix it.
Hope to be helpful.
Best Regards
Big Al

Jun 28, 2011 | 1979 Harley Davidson XLH 1000 Sportster

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

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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

Brake lights don't work for my 94 grand am. fuse still good.


sounds like you have a bad brake light switch, its located on the brake pedal , you can unplug the switch and check for power at the connector with a test light , find the wire that lights up ,plug it back in and go to the other wire with test light and with test light probbed in other wire push brake pedal in and test light should light up if not ,bad switch.

Feb 11, 2011 | 1994 Pontiac Grand Am

2 Answers

O2 Dodge Dakota Brake lights wont work but bulbs r good.


If the bulbs are good I would suspect the Brake light switch.

Brake Light Switch: Testing and Inspection
The brake lamp switch can be tested with an ohmmeter. The ohmmeter is used to check continuity between the pin terminals.
Switch Circuit Identification
- Terminals 1 and 2: brake lamp circuit
- Terminals 3 and 4: RWAL/ABS module and Powertrain Control Module (PCM) circuit
- Terminals 5 and 6: speed control circuit
Switch Continuity Test
NOTE: Disconnect switch harness before testing switch continuity.
With switch plunger extended, attach test leads to pins 1 and 2. Replace switch if meter indicates no continuity.
With switch plunger retracted, attach test leads to pins 3 and 4. Replace switch if meter indicates no continuity.
With switch plunger retracted, attach test leads to pins 5 and 6. Replace switch if meter indicates no continuity.


27c4c52.jpg

Sep 11, 2009 | 2002 Dodge Dakota Club Cab

1 Answer

'00 TJ brake and 4way lights not working


Check the brake switch on the brake pedal for your brake light prob. There are 2 wires on the switch, one is 12 volts and the other gets 12 volts when you step on the brake pedal. You can check tis with a test light.

Jun 15, 2009 | 1991 Jeep Wrangler

2 Answers

My brake lights do not work for 1998 ford explorer


Check and make sure you have the right bulbs and fuses installed. However, it sounds like a wiring problem. Probably at the rear of the vehicle. If you are in a "snow" area state, the ice and snow formation can break or pull wires apart. Also, check your ground wires.

Feb 10, 2009 | 1998 Ford Explorer

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