Low Speed Wiper Operation
WARNING: This page is about a different car, the 2004 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
When the ignition switch is in the ON or START position, and the front wiper switch is turned to low position, the BCM detects a low speed wiper ON signal by BCM wiper switch reading function.
BCM then sends front wiper (low) request signal over CAN communication lines
- from BCM terminals 39 and 40
- to IPDM E/R terminals 48 and 49.
When IPDM E/R receives front wiper (low) request signal, it supplies ground to energize the front wiper relay.
With the front wiper relay energized, power is supplied
- from front wiper relay
- to front wiper HI relay
- through IPDM E/R terminal 21
- to front wiper motor terminal 3.
With power and ground supplied, the front wiper motor operates at low speed.