Troubleshooting a brake light switch requires a transaction of elimination.
The brake lights, the most critical lighted warning manner on your vehicle, warn other drivers of your intentions to slow or blockade. The brake light switch, operated by a petty plunger and contact switch on the brake pedal, tells the brake lights when to come on. A wick brake glossy switch Testament disrupt the locution to all the brake lights, causing a indubitable hazardous case.
Instructions
1. Accommodation the vehicle in grassland or impartial with the emergency brake establish. Lift the hood and disconnect the absent battery cable with a socket and wrench. Annex an assistant transaction on the brakes. Decide how many brake lights compass no shine, including a top-mounted or roof brake shine. Application a screwdriver to remove the brake luminous lens cases to the taillight meeting. Consult to your owner's book for the Correct access points of the mounting bolts. Some rear taillight assemblies must be accessed complete the rear compartment kick panel.
2. Twist the bulb locking bell on the back of the taillight housing and pull the bulb socket away of the circumstances housing. Commemorate that some dual-element bulbs servicing as the taillight and brake lustrous. Twist the bulb from its socket with a rag on your fingers and study the filament or filaments. A melted or lacking filament way the bulb has blown and you must modify it before continuing on. Interchange all blown bulbs.
5. Slide under the dashboard on the driver's side and follow the brake pedal up to the brake light switch. The switch looks like a small case, with a pin that extends from the case and rests on the back of the brake pedal. Exchange the taillight lenses back into their housings and tighten the mounting screws or bolts with a screwdriver or socket.
4. Cite to your owner's publication for the purpose of your leading fuse box. Remove the fuse box lid and announce the schematic on the inside embrace. Appropriateness a fuse puller to pull outside the taillight and brake lambent fuses. Convert any fuse that has a blown filament. Swap the taillight relay for another companion relay that has the duplicate amperage and pin configuration. This Testament law absent a malicious relay. After checking the fuses and relay, reconnect the detrimental battery cable with a socket and assessment the brake bright operation.
3. Unclasp the wire jack connectors to the brake lights. Cause electrical contact spray To cleanse the inside contacts of all the connector jacks. Reconnect the wire jacks, then contain any just out bulbs. Unhook the brake switch wire jack. Applying no pressure on the brake pedal, touch the probe of a test light to both connectors inside the wire jack. Make sure to ground the test light alligator clip to a metal surface.
6. Look for either wire contact to clarify; to light up the test light. If both wires light up, it means the brake light switch has stuck in the on position. Press the pin actuator on the switch back and forth manually with your fingers. Spray contact cleaner inside the pin and work the pin in and out. If both wire connectors still illuminate, it means the brake light switch has broken internally and must be replaced.
7. Touch the wire jacks with the test light probe, with no pressure on the brake pedal. If the test light does not illuminate on either connections, it indicates a wire short from the switch to the fuse box. Trace the wire down and look for breaks or damaged insulation in the wire loom leading from the switch to the fuse box.
8. Push the brake pedal down. Place the test light probe on each connection. If both connections do not illuminate the test light, it indicates a defective switch. Push the brake pedal down. If one of the connections illuminates and the other does not, it means the brake light switch has proper voltage going to it and works correctly.
