FYI!! 5/28/04 Reply info for the wiper cycling issue. My name is Rick and I am a Viper Tech in Florida. We have a Viper with this Cycling issue in our shop right now. The following is what we have found thanks to the info on in this forum.
This Cycling problem "IS" due to an aftermarket Audio system as suggested. The System, in this Viper, has 2 large Capacitors wired into the Audio power supply to stablize the radio voltage when a large load is turned on (ie: headlights, a/c, etc.) When you shut the vehicle off, the Capacitors create a voltage spike back through the Radio and Wiper Module "ignition on" circuit. This is what causes the Wipers to cycle when the key is turned off. The Installer for the system will need to put a diode between the Wiper module and the radio to stop this condition.
The wiring for most all the Viper Audio Systems is the same, so this can happen in most all model year Vipers. Page 08-11-05 of the wiring diagram section of the 99 Viper Service Manual (should be the same for most all manuals) shows the relationship of the Radio and the Wiper Module. They both use the same ignition switch voltage source though, it splices to 2 different fuses, one for the wiper module and the other the radio.
Thought you might like to know
Thanks for the Help
Rick
This Cycling problem "IS" due to an aftermarket Audio system as suggested. The System, in this Viper, has 2 large Capacitors wired into the Audio power supply to stablize the radio voltage when a large load is turned on (ie: headlights, a/c, etc.) When you shut the vehicle off, the Capacitors create a voltage spike back through the Radio and Wiper Module "ignition on" circuit. This is what causes the Wipers to cycle when the key is turned off. The Installer for the system will need to put a diode between the Wiper module and the radio to stop this condition.
The wiring for most all the Viper Audio Systems is the same, so this can happen in most all model year Vipers. Page 08-11-05 of the wiring diagram section of the 99 Viper Service Manual (should be the same for most all manuals) shows the relationship of the Radio and the Wiper Module. They both use the same ignition switch voltage source though, it splices to 2 different fuses, one for the wiper module and the other the radio.
Thought you might like to know
Thanks for the Help
Rick
