1991 Audi 100 reverse lights won't turn on when in Reverse
Mechanic says it's likely Backup Light Switch. I understand it's in the gearbox area, and the part is inexpensive, yet the mechanic makes it sound like a huge undertaking and I want to know if this is really something i could do myself with the correct directions and some visual aids?
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Re: 1991 Audi 100 reverse lights won't turn on when in...
On the side of your transmission will be a switch with several wires
coming out of it. This is your reverse switch that turns on your
reverse lights and most likely needs to be replaced. The switch is just plug and play
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I didn't find a location for the backup light switch,
But found the following on Autozone.com:
Backup Light Switch Operation: An open switch that prevents voltage from being applied to the backup lights until the vehicle is put in reverse. Putting the vehicle in reverse closes the contact and applies power to the rear back-up lights.
Check under the dash or somewhere near the steering column if you have a column shifter. If the shifter closes or opens the backup light switch mechanically, one should be able to trace the cable and mechanisms that turn a cam that connects to the backup light switch, somehow.
May have to disassemble the steering column area to see it.
try testing the reverse light switch on the gearbox first but please dont ask where it is as i have no idea iam a europeon mechanic and as yet havent worked on one of these vehicles ,seen and worked on ford explorers and jeeps but not a GM vehicle like this as not imported into spain .sorry
On the gearbox. this is easy to find but requires 2 people as there is 2 or 3 plugs on the gearbox. put the vehicle in reverse and turn ignition on, DO NOT START! remove one plug at a time from the transmission while someone stands at the rear of the vehicle and lets you know when the reverse lights go out.
KEEP HANDS AWAY FROM THE FAN AS THEY CAN START ANYTIME AND REMOVE ANY JEWELERY. Good luck.
There is a switch attached to the gearbox which activates the reversing lamps when you place the gearbox into reverse. This switch has two wires going to it, one wire is an ignition live feed and the other is the feed to the rear lamps. This switch is usually on the side of the gearbox but quite high up towards the top of the gearbox. You can remove this switch with no danger of losing gearbox oil and replace it. Using a test lamp (which you can buy from any auto parts store), connect the end with the clip to the body on a clean area to ensure a good electrical connection and the pointy end to each of the wires on the switch in turn. With the ignition on but the engine NOT RUNNING, one wire should be active and the other will become active when the gearbox is placed in reverse gear. If neither of the wires are active, check fuses etc. If one wire is active but the other does not become active when reverse is selected, replace the switch. If both wires do what they are supposed too, check the wiring from the switch back to the rear lamps and check for broken or disconnected wires.
The switch can be accessed from underneath the vehicle. Remember that these tests are conducted with the ignition turned on but THE ENGINE NOT RUNNING....