I was installing a climate control unit in my car and I had to remove the stereo, i removed the stereo to install it, once I was done I reinstalled the stereo and my check oil light was flicking, then the whole left side of my car decided to go out the headlights, taillights, and my obd2 port doesn't scan as well and my check oil light was on and when I was driving it turned on, when I stopped at a light it turned back one until I got home, I've check ever fuse and bulbs and they seem to be fine
What makes this problem better or worse?
Nothing
How long has your 1999 BMW 323is had this problem?
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Hi, this is Bo, an auto expert on RepairPal's Car Genius team!
When the entire left side of your 1999 BMW 323is’s lights decide to take the day off after a climate control installation, it screams electrical issue. Since the problem popped up right after you worked near the stereo, I’d suspect a blown fuse, a pinched wire, or a grounding issue caused during reassembly.
Double-check the fuses, especially for the lighting and OBD2 system. Even if a fuse looks fine, testing it with a multimeter can confirm if it’s truly functional. The left side of your car’s lights and OBD2 port may share a common ground or power supply, so ensure all grounds near the stereo and climate control are connected and secure.
If you nicked or unplugged a wire behind the dash, it could disrupt circuits for multiple systems. Pulling the stereo and climate control unit back out for a second look might reveal a loose connector or damaged wire. A wiring diagram for the car could help trace any shared circuits.
If nothing jumps out, a professional with a scan tool can track down where the power is getting interrupted.
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