I looked at an 02 Envoy today that we installed a Viper 160XV into about a year ago, using a 555L and 455G module. Customer is having problems with fuses blowing in the underhood fuse/relay box.
Most commonly, fuse #17 labelled "crank" blows. It is not occuring during RS operation, as the customer hasn't used the remote start recently but is blowing the fuses during normal vehicle operation. With the fuse blown, the engine will start but will not shift out of Park. On the last occasion, both the "crank" fuse and fuse #27, labelled "back-up" were blown.
The dealer, of course, blames the remote start. I inspected all the remote start wiring and found no problems. Any ideas?
The crank fuse supplies the PCM with power and nothing else. The back up fuse supplies the park/neutral switch with power and then feeds back into the underhood fuse box to fuse 4 and 25. Ask your customer if he tows a trailer as those circuits are for the trailer harness. The problem may just be a defective neutral switch. I have seen other similar things on GM trucks where the circuits inside the neutral switch screw up the starter circuit. The switch may be causing a feedback problem and is drawing power backwards through a circuit and blowing the crank fuse. If nothing else, disconnect the remote starter and recheck all the main power wires to make sure nothing is shorted out. The dealer will always blame the aftermarket product because very few mechanics understand electrical and don't want to have to deal with anything that isn't factory installed. They take the easy way out. If you can solve the problem and show them their error maybe they will be less likely to blame others next time.
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sparky