Front wiper high/low relay

The front wiper switch is a direct input to the BCM. The BCM sends a PCI Bus message to the IPM informing it to turn on the front wiper high/low relay. The relay switches power between the low speed and high speed windings of the wiper motor. The front wiper high/low relay is turned on internally by the IPM as soon as the IPM receives the message from the BCM. This circuit is electronically controlled and the coil side of the relay is monitored for malfunctions.