I recently installed a rear backup sensor warning system on the rear license plate that splices into the backup light in the trunk lid. After about a month the following happened.
One of the back up bulbs went out. I also had the following on the dash board:
- lamp warning light on (all the time)
- reverse indicator stays on R when in any gear (other gears are on as well)
- check engine light stays on (error code was for neutral safety switch)
I disconnected the new wire and still had the same problems.
I changed the bulb and the new bulbs made the other bulbs go very dim (grounding problem?) and they blew quickly.
All other bulbs are working fine.
Any ideas?