Question about Chrysler Neon
Most likely there is a problem with the brake light switch, the switch is located above the brake pedal under the dash, here is how u check it out and get the lights working again.
Let's go through an open circuit in the brake lights. The brake lights are always hot, this means 12 volts is always present, that is to say they are powered all the time, key on, off or in your pocket. The best way to troubleshoot an open is from the battery back. In the typical brake light circuit power goes from the battery to the fuse box to the brake light switch to the bulb and then to ground. Take the test light and put the clip on the negative battery terminal and touch the point to the positive battery terminal. This does two things, it checks the battery for voltage and it insures your test light is working properly. There's nothing worse then the feeling you get after spending an hour looking for a problem and finding out the bulb in your test light is burnt out.
Next you check the fuse. The fuse box is usually marked with the fuse amperage and the circuit. For example, Brake lights 10 amps. If the fuse box is not marked, it will be in your owners' manual. Clip the test light to a good ground and touch the point to each side of the fuse. If the light lights on both sides, then the fuse is good. If it doesn't, then the fuse is bad. Replace it before you continue. If neither side lights up, you have an open between the battery and the fuse box. Repair the wire before you continue. Now by looking at the wiring diagram we see from the fuse box it goes to the brake light switch. The brake light switch is a simple on-off switch. When the brake pedal is up, the switch is open. When the brake pedal is down, it closes, completing the circuit. Touch the test light to both terminals of the brake light switch, one side will be hot and the other side will not. If both sides are hot then the switch is not opening and the brake lights are on all the time. As with the fuse, if neither side lights, you have a broken wire between the switch and the fuse. Repair the wire before you continue.
Now push the brake pedal down and touch both sides. Both sides should be hot. If they aren't, the brake light switch is not closing and is no good. You'll need to replace the switch before you go on testing. Looking at the wiring diagram we see the wire goes from the brake light switch to a connector in the back of the car. Go back there and locate the connector and unplug it. Now you see there are 5 wires in that connector. Which one is the brake light wire? Looking at the wiring diagram tells us that the blue wire is the brake light wire. So touch the test light to the blue wire and if it lights, you have power to that point. If it doesn't, then you have an open between that connector and the brake light switch. Repair the break before continuing.
Now we see it goes from that connector to the brake light bulb socket. Take the bulb out and touch the contact inside the socket with the test light. If it lights, then you have power up to that point. Put the bulb back into the socket and from the back, pierce the black (Most automakers use black for the ground wire. German automakers use brown for ground.) If the wire is hot, then the bulb is good. If not then replace the bulb before you continue.
Now by looking at the wiring diagram we see that this black wire goes to ground. Skin a little insulation off and connect a jumper wire from there to a good ground. If the brake light lights, then you have a bad ground. Repair the ground wire. Now you have tested the whole brake light system.
This is a simple circuit to troubleshoot, but the troubleshooting technique is applicable to any circuit. A circuit may branch off here and there, but if you look at each section and test it as you go along, you will find the problem fairly quickly and easily.
Posted on May 04, 2010
Look under the dash at the switch that the brake pedal uses to send power to the brake lights. You can get a multitester and make sure the switch has power and you can also jump the switch and see if the lights come on! If you can short it...you probably need a new switch. If you have power but shorting doesnt work. You most likely have a short in the line running back to the lights.
The most common problem would be the switch since it mechanical.
Good luck and be careful!
Posted on May 04, 2010
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Posted on Jan 02, 2017
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