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1G Reverse light switch not working: Can it be fixed, or replace?

Posted by XC92, Nov 25, 2020

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  1. XC92

    XC92 Proven Member

    505
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    Joined Jul 22, 2020
    Queens, New York
    I'm just about done getting my '92 Talon TSi AWD manual in driveable condition, and the last steps that remained were checking all the exterior lights so it passes inspection. Everything checked out except the reverse lights. So I pulled the plug from the trans and jumped it with a wire, put the car in reverse with the key in and on but the car not running, and the reverse lights came on. So it's the switch.

    First, is there ever a case where the switch is actually fine and the problem is in the trans itself, and if so what generally needs to be fixed or replaced?

    And second, if it's the switch, I can order a new one for around $20-$25 online, a bit more from a local Mitsubishi dealer, but I'm wondering if these things can be fixed. It appears to be pretty easy to remove, just a large hex bolt, so I'll pull it tomorrow and have a look-see. But if anyone's fixed one of these, I'd appreciate any feedback. I prefer fixing to replacing when it's all the same.
     

    354  1

    1992 Eagle Talon TSi
    awd · manual · 1G DSM
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  2. luv2rallye

    luv2rallye DSM Wiseman

    7,828
    720
    Joined Jun 7, 2003
    Minneapolis, Minnesota
    Know that on at least the 2g the washer under the backup switch must be there and the correct thickness (0.037") for the switch to work (even if the switch is brand new). So pull out the switch and check if it's working with an ohmmeter. If so try the correct washer.
     

    3K  0

    1999 Mitsubishi Eclipse GST
    14.200 @ 95.000 · 2G DSM
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  3. nismojones

    nismojones Proven Member

    67
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    Joined Jan 10, 2008
    Eastpoint, Michigan
    The switch is just a spring-loaded ball that makes contact when the shift lever is moved there. Not a lot to go wrong but its a sealed switch and non-serviceable. You can pull it out and not lose fluid, and check to see if the shift rail is moving through the range to hit the sensor ball, which it likely is (you would have issues engaging reverse/1st).
     
  4. Mech Addict

    Mech Addict Supporting Member

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    Joined Jun 9, 2019
    Jackson, Wyoming
    So you jumped the connector and then put it in reverse? Seems like the lights would be on continuously with the jumper, and gear reverse engagement irrelevant...:confused:

    You should be able to check the your installed switch function with an ohm meter, and the car not running, but shifing in and out if reverse.:aha:
     
    Last edited by a moderator: Nov 26, 2020

    Street Build 659  6

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM
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  5. XC92

    XC92 Proven Member

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    Joined Jul 22, 2020
    Queens, New York
    No, I jumped the wiring harness plug that plugs into the trans reverse switch, which simulates what the switch does when in reverse. I.e. it closes the circuit (I'm assuming that it's a NO switch, as there's no way to tell with the broken one if it's NO or NC as there's no continuity either way).

    This turned on the backup lights, with the key in the ON position and the engine off, and confirmed that the wiring, circuit and lights are fine and the problem is entirely in the switch or trans.

    Taking the switch out confirmed that it's the switch, not the trans or a missing washer (which wasn't missing and is pretty thin, like 1-2mm just eyeballing it).

    I'm ordering a replacement aftermarket part from Advance Auto and will pick it up tomorrow and see if it fixes the problem. It's just $13. The OEM is nearly $30 but I figure it's just a switch so it's not likely to go bad any time soon.

    I just need it to pass inspection. If it goes bad after that I have time to get an OEM and return this one with the car legally parked on the street.
     

    354  1

    1992 Eagle Talon TSi
    awd · manual · 1G DSM
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  6. steve

    steve DSM Wiseman

    13,607
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    Joined Feb 3, 2002
    Boulder, Colorado
    Sounds like you have it figured out. This is for future reference.

    1G BackupLights.PNG
     

    286  4

    2008 Audi TT 3.2 Quattro Roadster
    awd · manual · Misc Vehicles

    260  5

    2002 Audi TT Quattro Roadster 225
    awd · manual · Misc Vehicles

    255  2

    1992 Dodge Stealth RT/TT
    awd · manual · 3000GT/Stealth

    4K  12

    1991 Mitsubishi Eclipse GSX
    manual · 1G DSM
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  7. XC92

    XC92 Proven Member

    505
    64
    Joined Jul 22, 2020
    Queens, New York
    I seem to be answering a lot of my questions this week. Glad to be of help to myself! :applause:
     

    354  1

    1992 Eagle Talon TSi
    awd · manual · 1G DSM
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