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Thread: E36 Brake Lights

  1. #1
    Join Date
    Oct 2018
    Location
    Las Vegas
    Posts
    2
    My Cars
    98 e36 m3

    E36 Brake Lights

    So I currently have a 98 e36 M3 sedan and im having an issue with the “brake light circuit failure” message. Im blowing fuse 46 which is linked to my brake lights and gauge cluster for my fuel level and oil temp. My trouble shooting so far:
    -I’ve replaced my brake light switch twice.
    -I have opened the glove box and panels under the steering column looking for frayed wires or wires making a ground but have not found any.
    -Same with the trunk I have investigated the whole trunk for frayed wires and nothing seems worrying at all.
    -I’ve disconnected the tail light assembly’s and the fuse still blows when I press the brakes.
    -I’ve gotten it to work for a few minutes when I unplugged all the control modules and plugged them all back in. But after tinkering with a loose bulb on my tail light (the brake light bulb) the fuse blew again.
    -So I think it’s my tail light assembly that is malfunctioning (they are after market). But I am confused as to why the fuse is still blowing when I disconnect the tail lights.
    -Or could this be a control module issue
    Any help would be great i need these fixed.
    Thank you.

  2. #2
    Join Date
    Sep 2005
    Location
    Peoria, AZ
    Posts
    7,696
    My Cars
    03 zhp, 97 e36m3, 04 zhp
    Does your m3 have a spoiler with a 3rd brake light? If so, you may have an issue with the wiring loom that goes from the body into the trunk lid on the driver's side.

  3. #3
    Join Date
    Oct 2018
    Location
    Las Vegas
    Posts
    2
    My Cars
    98 e36 m3
    No spoiler, I’ve checked the wiring to the light behind the back windshield and nothing is damaged.

  4. #4
    Join Date
    Nov 2008
    Location
    SF Bay, CA
    Posts
    5,174
    My Cars
    72 + 75 2002's
    I simply tossed my OBC in storage and couldn't be happier about it.

    I know that's not terribly helpful, but it provides almost nothing you can't do/check yourself.
    Current_SeeDee 1972 Type 114 Luna 1975 Type 114
    Past___Veronica
    1994 e36 Le-Ah 1987 e30

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