Brake Light Switch Check

Touch the probe of the test light to each of the switch terminals in turn.

Brake light switch check.

On most brake light switches there are two four or up to six pins. To check this disconnect the wires to the switch and join them together. Abs wheel speed sensor. Test brake light switchif you are trying to test your brake light switch and know for sure if the brake lig.

If neither procedure light up the test light or reads 12 volts on the volt meter then the brake switch is not receiving power and the problem is in the wiring to the switch. If the brake light switch shorts internally it may cause the brake lights to stay illuminated even when the pedal is not being pressed. How difficult is it to replace the brake light switch on my mercedes benz. If power is connected and the switch is working properly the test bulbs will illuminate.

Changing the brake light switch is easy. Otherwise the switch is defective and should be replaced. If both terminals cause the lamp to light the fault lies in the wiring between the switch and the brake lights. Check replace brake light switch f check measuring value blocks mvb special notes.

The test light should illuminate or volt meter read 12 volts if the brake switch is operating properly. Get an advanced scanner to read trouble codes. Then test the other wire. A better way to check for a faulty brake light switch is to remove the brake light switch from the brake pedal and check for continuity.

If the light only illuminates on one terminal the switch is faulty and should be adjusted or replaced. If the reading keeps at 1 or ol then the brake light switch is broken. This is how you test your brake light switch with a digital multimeter. This can be ignored and will not appear if you press the brakes once before checking for fault codes.

Place the sensor on just one of the two wires and hold the brake pedal down as you do so. Many automatic transmission control modules will show a dtc 00526 or 17087 that indicates a faulty brake light switch. If you replaced the brake light switch and the light is still you should check a few other things such as. If it doesn t light up the brake light switch is faulty and will need to be replaced.

How to know if brake light switch is bad or good. You will need the brake light switch diagram which may be printed on the brake light switch itself in some cases. The brake lights should now come on.