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Discussion Starter #1
Car:
1991 Spider (S4)

Problem:
Both power windows stopped working.

Diagnosis:
  • Since both windows were working fine and then both failed at the same time I started with the assumption that it was likely a fuse or relay and not a motor or one of the switches.
  • Checked Power Window 25amp (Fuse 1) and 7.5amp Power Window Relay (Fuse 8) and both were fine. I replaced with new ones just in case.
  • I then checked the Power Windows Relay (Relay I12 - see page 40-20 in shop manual). To check it I swapped the Heated rear window relay (I2) with the Power Window relay (I12) since both relays were exactly the same. When I did this the power windows began working.
Solution:
Replace Power window relay (I12)

QUESTION:
I now no longer have a relay for the Heated rear window relay (I2) since I took it to replace the bad one in I12. Do I need to replace the Heated rear window relay? Does it do anything besides the Heated rear window of the hard top? (I do NOT have a hard top or plan to ever get one).
 

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Window Relay

Just checked my IA manual. It shows the heater relays only connection is the rear window and it's operation switch.
 
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