1997 Boxster schematic help please

[suburban99]

Hey all, I am having trouble figuring out why my defrost light is on.

My 1997 Boxster's defrost switch light comes on when the door locks operate to open the car.

I have looked at the 97 schematic sheet 9 and their is a wire from the door locking module drivers side to the mirror heating.

When I unlock the car the light goes on on my defrost switch. It stays on until after car has been locked again then it goes out, after some time.

I guess the question is what is the connection between the door locking module and the defost? I have changed the defrost relay already.

Thanks

[suburban99]

When you first open the car do the mirrors automatically defrost?

[juniinc]

Nope, I don't think so.

[suburban99]

Anyone?

[Loren]

Sounds like a shorted wire in one of the doors/mirrors.

Have you had a door panel off?

[fitsintite]

Anyone?

There is a black junction box where the door hinges are, this box has male and female plugs in there, open it up and check to see if the pins are corroded.

If they are corroded find a way to clean, fix or replace them.

I would start with that.

Edited September 12, 2009 by fitsintite

[fitsintite]

This is the box

[suburban99]

Thanks...I will check and report back. Why is the defrost switch attached to the doorlock circuit? Ground?

[fitsintite]

Thanks...I will check and report back. Why is the defrost switch attached to the doorlock circuit? Ground?

I think it's to defrost the door mirror and you have a short in that box somewhere.

[suburban99]

Pulled black box connection apart, wires and connectors are as new. Still have di-electric grease on them and no signs of moisture.

With the drivers side door connection pulled apart the defrost light was still on. What's next?

[RFM]

PIWIS diagnostic tool should be next, it will help you out in 5 minutes at low costs.

[suburban99]

Will Durametric work?

[RFM]

No idea about Durametric, probably if there are test possibilities in their program, and not only fault code reader/remover.