This can be used for either the back-up lights or the brake lights.
There are a couple of ways to track this down. Of course, make sure your fuse and bulbs are in good condition. Disconnect the wiring to the switch. Measure the feed wire and make sure you have 12 volts. Note: Make sure the key is turned to the RUN position so you have juice to the wire. If there is no voltage, trace the wire back to the fuse and find out why! If you have 12 volts, connect a jumper wire of the correct gauge to jumper the connector. If the lights come on, it looks like a bad switch.
Put the car in reverse and use an ohm meter to check the resistance in the switch. It should be minimal. If not, replace the switch.
If everything looks good back to the bulbs. Go to the next step.
Disconnect the two bulbs and, put the car in reverse to engage the lights. Note: Try not to do this with the car running. If you insist, have a buddy with a strong, steady foot and chock the tires. Someone needs to be in the back measuring the power!
Measure the voltage at the socket. It should be about 12 volts. If it isn't you need to trace the wires back to the switch. If you see 12 volts, install one of the bulbs and remeasure the voltage. It may be that when there is no load on the circuit, everything looks fine. When you put a load on the system and the voltage drops, you have have a bad connection somewhere. Check your ground connections on the lights and check the connector at the switch.
2001 Mazda 626:
On a 2001 Mazda 626 (and I suspect many other), there is a relay in the fuse box under the hood. It is labelled the TNS relay. If your horn or headlights still work, swap the relays between one of them and the TNS relay. If, after making the swap, your lights now work and your horn does not, you have found the culprit. Unfortunately, neither Advance Auto, Autozone, O'Reilly, or Carquest stocks this relay. Some can order it - $19 and change at Carquest.
I have a 1991 Chevy surburan and it has no tail lights and no dash lights, all fuses are good
Probably the dash fuse is blown, or the dimmer switch for the dash lights is bad!
try a test light on both sides of the fuse, tail and dash lights are on the same circuit
It could be the dimmer switch that will adjust the dash lights
I have a 97 Buick Park ave and the dash lights went out ? all other lights seem to be working , and I cannot identify which fuse , if any could be in need of replaceing . I cannot , with the owners manual , identify which fuse it is that controlls the dash lights ? there are too many , fuses with confusing acronyms ? Any one know exactly which fuse I need to check ?
dash panel lights working? all fuses ok?, check on the fuses box under the hood it's a number 10 red, check if keeps blowing up
1995 Chevrolet Monte Carlo no tail lights or dash lights they will come on at time and go off the fuses are not bowed. The tun singles and flasher and brake light work. What should I look for now?
If the fuses are all good (which, I bet they are), you most likely have a faulty dimmer control. Almost all the dash and interior trim lights are wired through this switch to allow you to dim them. If it has gone bad, that could cause them all to stop working. Fairly inexpensive and easy to change. Check the fuses-- under the dash and/or under the hood.
Switch most likely.
u may have a defective multifunction switch
It is either a bad relay , cut wire or the wrong wattage bulb .
If all fuses are good perhaps a bad headlight switch?
The dash light dimmer switch is turned off or broken.
If the fuses are good then it's probably the headlight switch. There is a setting that turns the dash lights off, check and make sure someone hasn't been turning your knob.
Check the fuses. If they are good then you will have to replace the headlight switch.
If the parking/tailight fuse is good - then it may be a bad headlight switch No tail lights but the bulbs are working? Please explain.
Assuming the bulbs are good, the dash illumination light brightness control switch is turned off or broken.
bad combination light switch
I have same problem.
Did you check the fuses in the engine compartment, there is one more fuse for the lights inside of the car.
Replace the fuses if they go out its a short. Good luck finding that
Change front light bulbs
we got the car like thaqt so i dont know but the new fuse blow out when i start the car