Denso Window Motors, Warning - Don't use with Jaguars !

[Ether]

Originally Posted by Gdeaver

We changed the tan jags to black jags with coast last night and it still happens. If I catch it as soon as the motor locks and pull the PWM cable and reinsert the motor functions. With the black jags once a motor locks it heats up faster with the black jags. < than a minute till the PTC resistance goes high. It heated slower with tan jags. We will install victors Wednesday night and see if victors are the answer. I took apart a spare window motor and there are 2 chokes and 2 caps in addition to the PTC. We could short the PTC now that it is off season but will do the victors to test. If the victors work then there has to be some weird resonance setting up between the filters, PTC and the jags frequency causing the PTC to heat. If the victors work then the jags will always be suspect with emi filtered and PTC protected motors. Maybe this is one reason IFI never went above 2000 HZ switching frequency.

Great post Gary. Thanks for the data. This really helps narrow down the problem... assuming everything works fine when you use the Victors.

Al: I know you have lots of documents. Do you by any chance happen to have a circuit diagram of the chokes and caps in the Denso? I'd like to see how they are arranged.