Low Speed Wiper Operation

WARNING: This page is about a different car, the 2003 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.

Power is supplied at all times

from BCM (input 1) terminal 48
to combination switch terminal 1, and
to 20A fuse (No. 39, located in the IPDM E/R).

When the ignition switch is in the ON or START position, and front wiper switch is turned to LO position, front wiper LO contact in combination switch comes ON, and Power is supplied

through combination switch terminal 3
to BCM (input 3) terminal 50.

When BCM determines that wiper switch is in LO position, it uses CAN communications and Front wiper request signal (LO) is sent

from BCM terminals 70 and 71
to IPDM E/R terminals 48 and 49.

When IPDM E/R receives front wiper request signal (LO), it energizes front wiper relay (in IPDM E/R). Power is then supplied.

from 20A fuse (No. 39, located in the IPDM E/R)
through front wiper relay (located in the IPDM E/R)

through front wiper HI relay (located in the IPDM E/R)
to IPDM E/R terminal 31
to front wiper motor terminal L.

Ground is supplied

to front wiper motor terminal E, and
to IPDM E/R terminal 14 (and to front wiper relay)
through body grounds E15 and E24.

With power and ground supplied, the front wiper motor operates at low speed.