Toyota Corolla Back Up Light Switch Guide: 1971-1983
If your reverse lights have stopped working, the back up light switch is a common and simple part to replace.
- The most common symptom of failure is reverse lights not working. Always check bulbs and fuses first.
- For this vehicle, a new aftermarket switch from a brand like Standard Ignition is the most practical and reliable option, as OEM parts are likely unavailable.
- Replacement is a straightforward DIY task for many owners, typically taking less than an hour with basic tools.
- Driving without functional reverse lights is a safety risk and may cause you to fail a vehicle inspection.
Is a Faulty Back Up Light Switch Causing Your Reverse Lights to Fail?
For a classic car like the 1971-1983 Toyota Corolla, keeping all the electrical components in working order is key to a safe and enjoyable driving experience. If your reverse lights are acting up—either not turning on at all or staying on constantly—a bad back up light switch is a likely suspect. Before you replace the switch, it's always a good idea to check the simple things first: make sure the bulbs aren't burnt out and that the fuse for the circuit is good. If those are fine, the switch itself is the next part to check.
Diagnosing the Problem
A common way to test if the switch is the problem is to access its electrical connector. After unplugging it, you can use a small wire (like a straightened paper clip) to jump the two terminals in the connector. With the ignition on, this should complete the circuit and turn on the reverse lights. If the lights come on, it confirms the rest of the circuit is working and the switch has failed.
Choosing an Aftermarket Back Up Light Switch
For a vehicle from this era, finding a new original equipment (OEM) back up light switch from Toyota is highly unlikely. Most have been discontinued for years. This makes new aftermarket parts the most practical and available option for most owners. The primary brand available for this specific part is Standard Motor Products (also known as Standard Ignition).
Standard Motor Products (Standard Ignition): This is a well-known and long-standing brand in the aftermarket industry. They are known for producing reliable replacement parts that often meet or exceed original specifications. Forum discussions among mechanics and car enthusiasts generally regard Standard as a quality choice, especially when OEM parts are not an option. For a simple but crucial part like a back up light switch, a Standard replacement is a dependable choice.
Estimated Cost Comparison: 1971-1983 Corolla Back Up Light Switch
| Part Type | Estimated Cost | Notes |
|---|---|---|
| New Aftermarket (Standard Ignition) | $85.63 | The most common and available option. Price is for the part only. |
| New OEM | N/A | Likely discontinued and no longer available from Toyota dealers. |
| Used OEM | $20 - $50 | Can be found at salvage yards, but the reliability of a 40+ year old switch is questionable. |
| Shop Labor | $60 - $120 | Estimated 0.5 to 1.0 hours of labor. |
Pro Tip: Check Your Transmission Type
The 1971-1983 year range covers several Corolla generations and both manual and automatic transmissions. While one aftermarket part number often covers a wide range of applications, always verify that the part is listed as compatible with your specific year, model, and transmission type before ordering.
Frequently Asked Questions (FAQ)
Where is the back up light switch located on a 1971-1983 Corolla?
The back up light switch is almost always located on the transmission. For manual transmission models, it is typically screwed into the side of the gearbox. You will need to safely raise the vehicle to gain access to it from underneath.
Is replacing the back up light switch a difficult job?
No, this is generally considered an easy to moderate DIY job for someone with basic tools. The process involves safely raising the car, unplugging the electrical connector, and using a wrench (often a 27mm or 1-1/16" socket) to unscrew the old switch and install the new one. It's important to use a new crush washer if one is provided to prevent leaks.
Are working reverse lights required to pass a safety inspection?
In most states, yes. Functional reverse lights are considered a safety feature and are typically checked during annual safety inspections. Driving without them can also result in a traffic ticket.
My reverse lights flicker or only work sometimes. Is that the switch?
Intermittent operation is a classic symptom of a failing back up light switch. The internal contacts wear out over time, causing an inconsistent connection. It can also be caused by a loose wire or corroded connector, but the switch itself is the most common cause of this specific problem.
Technical Specifications
OEM Part Numbers: 84210-12030 84210-20030 84210-12040
The switch is a 2-terminal, plunger-activated switch that threads into the transmission case. It completes a 12V circuit when the transmission is shifted into reverse.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- 🛍️ Shop This Part
- Is a Faulty Back Up Light Switch Causing Your Reverse Lights to Fail?
- Diagnosing the Problem
- Choosing an Aftermarket Back Up Light Switch
- Estimated Cost Comparison: 1971-1983 Corolla Back Up Light Switch
- Pro Tip: Check Your Transmission Type
- Frequently Asked Questions (FAQ)
- 🎟️ Get 5% Off