How to Replace a Backup Light Switch

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Replacing a backup light switch is fairly straightforward if you know what the switch looks like and where to locate it on your vehicle. A backup light switch screws into the transmission and is triggered when you shift the vehicle into reverse. If the switch is functioning normally, a circuit is completed when the switch is triggered and the white lights in the tail lights will illuminate, indicating to other drivers that you are backing up.

It is important to rule out the most common problem, which is a burnt out light bulb. This article is written with the assumption that you have already checked for burnt out light bulbs. By following this how-to, you should be able to successfully identify and replace your backup light switch.

Part 1 of 2: Locate your bad backup light switch

Materials Needed

  • Adjustable pliers
  • Box wrench (the size required to remove the battery terminals; often 12mm)
  • Gloves
  • Jack and jack stands (dependent on type of vehicle)
  • Phillips head screwdriver
  • Replacement backup light switch (for visual reference)
  • Socket wrench (the size required to remove the battery tray and air filter box; often 10mm)

battery sitting by itself

Step 1: Remove the battery. Use the box end wrench to disconnect the terminals connected to the battery.

Once the terminals are removed, use a socket wrench to remove the battery hold down bracket if there is one. This bracket will be secured with two bolts or nuts. These nuts or bolts are commonly sized 10mm.

battery tray

Step 2: Remove the battery tray. Use the socket wrench to remove the nuts or bolts holding down the battery tray and remove the tray.

air filter box

Step 3: Remove the air filter box. There is either a squeeze-type clamp or a screw-type clamp holding the intake pipe to the filter box.

Using either pliers or a screwdriver, remove this clamp and disconnect the pipe from the box.

Remove the box after removing the bolts securing the box to the vehicle.

backup switch on the top side of transmission

Step 4: Attempt to locate the backup light switch on the top side of the transmission. On some vehicles, the switch may be visible at this point.

If you have a transverse (sideways) mounted engine, you should be looking at the top side of your transmission.

Examine the electrical connector on the new switch and look for a sensor plugged into the transmission with the same amount of wires coming out of it, and a similar looking electrical connector. If you find the sensor and can access it from above, skip to Part 2.

backup switch on bottom of transmission

Step 5: Attempt to locate the backup light switch on the bottom side of the transmission. Jack up the front end of the vehicle and secure the vehicle with jack stands.

Typically a splashguard will need to be removed if the vehicle has a transverse mounted engine. It is common to find 10mm bolts or Phillips head bolts retaining the splashguard. Remove it to expose the bottom of the transmission. At this point you should be able to locate the sensor on the transmission.

  • Tip: This switch will be located in different locations depending on the type of vehicle. Most modern passenger cars currently on the road have transverse (sideways) mounted engines with transmissions closer to the front of the vehicle. On many trucks or rear wheel drive vehicles, the transmission is normally located farther back, and only accessible from under the vehicle.

Part 2 of 2: Remove and replace the backup light switch

Materials Needed

disconnecting the electrical connector

Step 1: Disconnect the electrical connector. Squeeze the tab on one side of the connector and disconnect the switch from the wiring harness.

Sometimes there is a retainer clip holding the wire to a nearby bracket to keep it secured and out of the way. Gently remove any retainer clips found.

  • Tip: Wear one glove on the hand holding the harness side of the connector if the connector is stubborn.

Step 2: Use an open ended wrench to loosen the switch. When the switch is removed, replace it with the new switch and carefully tighten the switch back into the transmission.

Tighten it firmly but do not use excessive force as the transmission case is usually aluminum and you do not want to strip the threads.

Step 3: Reconnect the switch to the wiring harness. Once the electrical connector is plugged back in, make sure to replace any retaining clips you may have removed in previous steps.

Step 4: Reinstall the disconnected parts. If you ended up under the car, replace the splashguard and hand tighten the bolts.

Lower the vehicle and reinstall the air box, making sure to reconnect the intake hose and replace the clamp.

Reinstall the battery tray, the battery, and the battery hold down bracket. Double check all of your work before reconnecting the battery. Reconnect the battery and get a friend to verify the lights work.

If after reading this, you still don’t feel comfortable attempting this on your own, one of our mobile mechanics at YourMechanic will be happy to replace the backup light switch at your home or office.


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Noe

35 years of experience
604 reviews
Noe
35 years of experience
Jeep Compass - Brake Pads Replacement (Front, Rear) - Renton, Washington
Noe was very nice and professional. He arrived on time and was very efficient, even when he had to run to the store for a different part. During the test drive he pointed out the repairs that he made and a few things that would need to be replaced in the future. I really liked the fact that he discussed the status of my vehicle and was clear to explain that certain repairs would enhance the operation of my Jeep, but were not detrimental. I appreciated his down to earth nature and his mechanical knowledge. I will definitely request him in the future!
Hyundai Elantra - Brake Light Bulb Replacement (Passenger Side) - Seattle, Washington
Professional and friendly!

Attila

18 years of experience
519 reviews
Attila
18 years of experience
Chevrolet Malibu - Reverse Light Bulb Replacement - East Orange, New Jersey
Attila was great. He arrived well in advance of the appointment time. He was pleasant, professional and knowledgeable. I was very pleased with the work he did and the suggestions he recommended. I would be happy to tell others about him and use him again at any time.

Michael

15 years of experience
529 reviews
Michael
15 years of experience
BMW 325xi - Reverse Light Bulb Replacement (Driver Side, Passenger Side) - Atlanta, Georgia
Showed up earlier than expected & did an excellent job. Also let me know a lot of things about my car that I didn't know. If you need a mechanic in the Atlanta area, he's the guy you need to call!

Gary

26 years of experience
226 reviews
Gary
26 years of experience
Chevrolet Tahoe - Headlamp Adjustment - Vallejo, California
Well, although I did explain the nature of the job, I think I misused the system. I scheduled a headlamp upgrade, not a repair. The mechanic was still willing to do the job and did so with the utmost professionalism. He was on time, presentable, and polite. I will absolutely use them again, for repairs.

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