My daughters lantis brake lights are no go. I have checked Fuse switch and bulbs, all ok I cannot detect voltage to the switc, The fuse checks out ok, but has 12v to BOTH sides of the fuse holder (with the fuse removed) any suggestions Cheers Doug
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I'd want to check voltage and ground for the stop lamps. Use a test light.
In the diagram for brake switch, the top wire is voltage, hot all the time, use a test lite to check for voltage, that circuit is fuse protected.
The lower wire in the picture goes hot when brake switch is activated and carries voltage to lamps. Like I said, the lamps need voltage and ground.
First check light relay fuse, if ok check battery voltage at low beam light terminal, if ok replace low beam bulb, if no voltage check switch side of relay, if voltage replace relay, if no voltage check headlight low beam switch.
Since the turns work in the back, that means the brake bulbs are good. Brake lights and turn signal lights share the same filament in the bulb.
There is a fuse for the brake lights. Then, there is a brake light switch on the brake pedal. You need a voltmeter or test light, after checking that fuse is good. Need to check if fuse has power on it. This is one of those fuses that are hot at all times-as long as battery is connected, voltage should be going through the fuse and up to the brake light switch. Check for power both places. The switch on the pedal is a simple on-off switch. When brake is depressed, the spring loaded switch is turned on-passing power on towards the brake lights.
But then the brake wire goes into the turn signal switch before going on to the brake bulbs...however, since your turns work good, I doubt if there is a problem in the turn switch. First check if the brake light switch is sending power on when switch is on.
Let me know what you find. Good luck.
Hi, your van does not use the signal filaments for the brake lights. You must have a wiring issue. Check for power at the brake light switch. If you have power there, the wire is broke from the switch to the S304 junction. If there is no power to the switch, the wire is broken between the fuse box and the switch. Please let me know if you have more questions, and thanks for using FixYa.
ok fuse and bulbs are ok then you have to start looking at switches there is a switch on the arm of the brake pedal, use a test light and make sure 12 volts is going through the switch then that voltage goes upto the multifunction switch in the stearing colum, this has your hazard lights, turn signals, and bright headlamp controls in it, check this by turning on the hazard lights see it the tail lights flash this uses the same wire as the brake light so if it lights you have a bad brake switch at the pedal, if nothing lights up 90% chance its the multi function switch
There is brake switch that is located on the brake oedal bracket, just to the right of the steering column mount. Youl need to remove the left side under dash panel to get to the switch and connector.
If the brake lights are inoperative, check the fuse.
If fuse is Ok, check the voltage at the light bulb socket when switch is not presed and when is presed. If there is no voltage back to the light bulb replace brake switch.
Assuming the wiring to the brake lights is serviceable, you will find that the brake light switch, which is activated by the brake pedal for the brake lights, will have failed and will need to be replaced.
Just ensure you first replace the fuse and both brake light bulbs as an initial step and then re-check to ensure you still have no lights.
Troubleshooting Procedures - Read Completely Before Beginning (American Car) All Brake Lights Not Working
Check System Fuse: A fuse is used to protect the brake light circuit from amperage overload. If the fuse has failed it will not allow the electrical current to continue to the brake lights. To check the fuse, first locate the brake light system fuse in the fuse panel which is either under the dash or under the hood in the power distribution center. Connect the test light to a ground like an engine or dash bracket and turn the ignition key to the "on" position. Using the test light probe both sides of the fuse. If the test light illuminates on both sides the fuse is ok continue onto the next step. If one side of the fuse illuminates the fuse has failed and needs to be replaced. If the fuse fails as soon as it is replaced or when you apply the brake pedal the brake light electrical circuit is shorted to ground. Rarely a system short can occur, a car repair manual is needed to find the wiring schematic for the brake light circuit. Once the brake light wiring has been located inspect and repair as needed.
Check Brake Light Bulbs: All cars have three brake light bulbs that create the brake light illumination affect. If all of these brake light bulbs fail no brake light operation will occur. I know what you're thinking, you might say all three brake lights at once? But in reality one brake light went out at a time and you did not notice. People only tend to notice something when they almost run into the back of your car to help persuade them to inform you the brake lights aren't working. Remove any of the brake light bulbs to confirm the bulb is ok or burned. After the bulb has been removed inspect the filament and replace if failed. If the brake light bulbs are ok continue to the next step.
Checking the Brake Light Switch: A control switch is used to connect the brake light electrical circuit. This switch is located near the brake pedal lever. Basic switches have just two wires, power in and power out to the turn signal switch. Use a test light that is grounded and with the key in the "on" position test for power at one side (wire) of the switch, then press the brake pedal while testing the opposite side (wire). It should illuminate the test light, if electrical power is connected through the switch go to the next step. If no power is detected through the switch the brake light switch has failed and replacement is required. If your car is equipped with more than two wires integrated into the brake light switch a car repair manual is needed to locate the proper brake light circuit wiring.