RAM 1500 Truck 4WD V8-5.9L VIN Z (2002)
Accessory Delay Relay: Description and Operation
The accessory relay works in conjunction with the FCM's power accessory delay features to control the operation of the radio, power windows, washer
pump motors, wiper motor and power outlets. The accessory relay is turned ON by the FCM See: Relays and Modules - Powertrain Management/Relays
and Modules - Computers and Control Systems/Body Control Modulethrough the relay's low side control circuit. This circuit is electronically controlled
and continuously monitored for malfunctions.
Depending on the ignition switch position, the accessory relay will remain ON or will time out and deactivate. The accessory relay remains ON in the
RUN and ACCY ignition switch positions. In the UNLK and OFF positions, the relay will remain energized for 45 seconds and then deactivate. During
this time-out period, if a driver or passenger door is opened, the relay will be deenergized immediately. While the ignition switch is in the START
position, the relay will also drop out and then resume operation. Accessory relay operation is most noticeable by observing the operation of the radio.