02 Q45 parking lights turn on when doors are open. [FIXED - blown fuse]

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EdBwoy
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02 Q45 parking lights turn on when doors are open. [FIXED - blown fuse]

Postby EdBwoy » Thu Jan 03, 2019 11:09 am

I am working on a car that wouldn't start and where the key was stuck in the ignition cylinder.
[More on that project later, but I noticed something strange that my 03 Q45 doesn't do.]

I accessed the key cylinder and released the key. Good!
The battery is decently charged, and will crank up the car.
I did the following tests with the headlight switch in the OFF or AUTO position, with the same results.
  • Open front left door (driver US) and the parking lights flicker on, stay lit momentarily and then turn off.
  • Open any of the other 3 doors and the parking lights stay on until that individual door is shut.
Lock/unlock the car manually or with the fob and it behaves the same.

Now, I see a benefit in this system being a door reminder system, but I don't see why only one door should behave any differently.
I saw nothing about this is the owner's manual, but maybe I missed it? I have a feeling this is the car warning me of some module not getting power... maybe related to why it cranks but won't start.

What do you guys think; does anyone else's Q45 do that?


EdBwoy
Moderator
Posts: 2933
Joined: Tue Dec 25, 2012 12:47 am
Location: St. Louis Metro East - IL
Contact:

Re: 02 Q45 door behavior. This can't be normal, right?

Postby EdBwoy » Thu Jan 03, 2019 9:39 pm

Definitely one of those warning signs I suspected.

There was a blown fuse. I replaced it and order was fully restored in my little universe.
The lights now behave normally and as a big prize bonus, I have solved the no-start/key stuck in ignition issue.

This reminds me of one time the fuse for my interior lights (dome lights, step lamps) of my 2003 M45 were blown. The self-closing trunk refused to work. It definitely caught my attention and I traced the issue to bad fuse. Its interesting as to how these cars were made.
Outstanding build quality.


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