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Rear window defroster WRX 2015

3K views 8 replies 4 participants last post by  mickael121 
Sure, it can be done. How involved are you willing to get doing it? It involves changing wires at the BIU and defogger switch and I think changing the switch itself to a mechanical latching one (not sure on this.)
 
Ah yes. Timer - I did forget about this, but i have turned mine on again right after it shuts off, with no ill affect. I think it depends on temp and water/ice conditions. But you are correct XJ, that not having it on the timer would introduce a new potential failure mode where the car is no longer timing it.
 
Forgot --- a "time delay relay" installed will replicate the timer in the BIU and if the delay time is set correctly on the relay, will eliminate the potential harm from leaving the switch on. Such relays are available for $10 - $50 ish.
 
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