After replacing dead battery, some features.

  • 1993 AUDI 100

After replacing dead battery, some features have not come back on--
like headlamps & cabin blower & a few other options. The car starts &
goes fine, but at some time I will need headlamps. Is this part of the check fault memory & purge system? If so are the codes located inside
the Warranty Voucher label. I cannot tell what letters & numbers
apply. How can this info be explained?

Friday, October 26th, 2012 AT 11:01 PM

1 Reply


Accessories such as headlights, blower motor & windshield wipers, usually get power from a "load reduction relay".

The relay is triggered by the Ignition switch. Try to wiggle the key (apply pressure up/down/left/right) while the
engine is running or just ignition ON, and see if things come back to life.

If yes, then you need an Ignition Switch.

If no, then the load reduction relay could be bad. I would have to check a wiring diagram if a fuse is also involved

I'm not sure if I have a wiring diagram. Would take me some time to find.

Let me know if the key trick works, if no, I will then look for a diagram.


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Saturday, October 27th, 2012 AT 1:36 AM

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