No brake lights or interior lights?

[SNaray8442]

2002 911 C2 Coupe

My brake lights and interior lights have stopped working...

Rear lights light up red with headlights on but don't switch on to the bright red for braking.

Also interior lighting will not come on in any configuration.

Any ideas?

I checked my fuses today and fuse C-3 was completely melted. The plastic was, it wasn't blown though... weird.

Edited November 11, 2008 by SNaray8442

[jam996]

C3 if for interior lights and take a look at B7 for brake lights.

[SNaray8442]

Like I said, C3 was melted but still allowing current. I replaced it and still no interior lights.

B7 is fine.

Any other ideas for culprits?

[RFM]

Check or change the brake light switch on the pedal to solve the brake light problem, take a look on the fuse if the AMPS are the same as it should, put a right one in and if the right fuse will blown than search the cause.

[SNaray8442]

I just went through and made sure all of the fuses are the correct values, they are.

B4 was blown, engine fan? I physically pulled every fuse out and tested them, B4 was the only one blown.

B4 does not pop after it was replaced.

No interior lights/glovebox/etc. No brake lights (but they do illuminate with headlights).

All other systems operational.

[Loren]

You likely have two seperate problems.

Please do as RFM suggested - brake lights are not tied to the interior lights.

Interior lights (including the glove box) are driven from central locking/alarm system (and fused by C3).

If the fuse was melted then perhaps you have a melted wire too?

Is this a Cab? Is there a chance the control box under the left hand seat got wet?

[SNaray8442]

Thanks for the replies everybody!

It's a coupe.

I'll check the brake switch on the pedal.

I'll start tracing wires from C3. The other systems on C3 (locking system, power mirrors, etc) all work flawlessly.

It's very unlikely that any of the interior got wet.

Edited November 11, 2008 by SNaray8442

[SNaray8442]

Reverse lights also not working.

I assume that's related to the brake lights.

Are there wiring diagrams available online?

[Loren]

Brake lights switche(s) are on the brake pedal - try bypassing them.

The reverse lights switch is on the transmission.

[SNaray8442]

I'll try that right now.

It seems like one hell of a coincidence that brake, reverse and interior lights all malfunction at the same time.

Are there any fuse/relay locations other than drivers footwell?

Does a single control module power these systems together?

[SNaray8442]

I just tried bypassing the switch - no deal.

Any other ideas/starting points?

Thanks again

[Loren]

I'll try that right now.

It seems like one hell of a coincidence that brake, reverse and interior lights all malfunction at the same time.

Are there any fuse/relay locations other than drivers footwell?

Does a single control module power these systems together?

No, I said that before they are not connected. Interior are off the alarm/central locking control and reverse is off the

How is your ignition switch? If you wiggle the key do things change?

[SNaray8442]

I'll try that right now.

It seems like one hell of a coincidence that brake, reverse and interior lights all malfunction at the same time.

Are there any fuse/relay locations other than drivers footwell?

Does a single control module power these systems together?

No, I said that before they are not connected. Interior are off the alarm/central locking control and reverse is off the

How is your ignition switch? If you wiggle the key do things change?

I'll try that next. Thanks.

[SNaray8442]

Wiggling the key does nothing.

[Loren]

Perhaps we are overlooking the simple?

How old is your battery? Have you had the cells tested and load tested?

A going bad battery can also cause some strange things.

[SNaray8442]

Battery is 2-3 years old. No problems turning over or anything else.

I'll have it load tested, though.

Edited November 19, 2008 by SNaray8442

[SNaray8442]

Hmm, I think I may have found a contributing factor...

I KNEW there had to be a common point SOMEWHERE.

I'm off to get some flux, these wires dont take too well to solder.

Once I get everything back together I'll come back with updates.

Hopefully nothing else was damaged by the short(s)

Edited November 26, 2008 by SNaray8442

[SNaray8442]

Welp, I spliced all the wires back together and reset everything by disconnecting the battery for half an hour...

Didn't fix anything.

I'm assuming that the short damaged some control unit somewhere. Does this sound feasible? If so, which ones should I check?

[Loren]

Since C3 was melted - I would start there.

Start with everything on the C3 circuit.

[SNaray8442]

Thanks Loren

What am I looking for?

High resistance in wires? Melted wires?

Popped light bulbs?

I really don't know anymore.

Edited November 27, 2008 by SNaray8442

[SNaray8442]

Where's a good place to get wiring diagrams?