Grand Cherokee 2WD V8-4.7L VIN N (2000)
The wiper system utilizes the BCM to control the ON/OFF relay for low wiper functions, intermittent wiper delay as the switch position
changes, pulse wipe, wipe after wash mode, and wiper motor park functions. The BCM uses the vehicle speed input to double the usual delay
time below 10 MPH (16 KPH).
Front/Rear Wiper And Washer Switches (Right Multi-function Switch Stalk)
The front windshield and rear liftglass wiper/ washer switches are located on the wiper multi-function switch stalk which is secured to the right
side of the multi-function switch mounting housing on the steering column.
A knob on the end of the wiper multifunction switch stalk is rotated to select the desired front wiper speed (HIGH or LOW) or one of the five
intermittent front wiper positions. The wiper stalk is pulled toward the driver to activate the windshield washer system. Both the front wiper
and front washer motors will operate continuously for as long as the stalk is held in the momentary FRONT WASH position.
Another rotary switch on the wiper multi-function switch stalk is rotated to select the desired rear wiper speed (ON or DELAY). The wiper
stalk is pushed toward the instrument panel to activate the rear liftglass washer system. Both the rear wiper and rear washer motors will operate
continuously for as long as the stalk is held in the momentary REAR WASH position.
If any part of the right multi-function switch stalk is faulty or damaged, the entire wiper multi-function switch assembly must be replaced.
Rear Wiper System Control Circuits
Rear Wiper System
Five circuits feed the rear wiper module. It has two high current circuits, battery (B+) and ground, that run the motor. The remaining three circuits
are low current control circuits.
Two of these circuits come from the rear wiper switch ON the right multi-function switch stalk. These circuits are referred to as the rear wiper
motor control circuit and the rear wiper motor intermittent control circuit. When the rear wiper switch is in the OFF position, both of these circuits
are open and the wiper module parks or remains parked. When the rear wiper switch is in the Intermittent position, the intermittent control circuit
is switched to ignition voltage, the motor control circuit is open and the wiper is in the intermittent modes. When the rear wiper switch is in the ON
position, the intermittent control circuit is open and the motor control circuit is switched to ignition voltage and the wiper is in continuous wipe
mode.
The third control circuit is the AJAR circuit. This circuit is fed by the flip-up glass ajar switch. When the flip-up glass is closed the ajar switch is
open and the rear wiper module functions normally. When the flip-up glass is open, the ajar switch is closed and the circuit provides ground to the
module. This ground signal indicates to the rear wiper module that it should park if operating or not allow operation if parked.
DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION
Airbag Diagnostic Trouble Codes
ACM Accelerometer
ACM Firing Stored Energy
ACM Internal Diagnostic #1
ACM Logic Stored Energy/Reset
ACM Output Circuit
Cluster Message Mismatch
Driver Squib Circuit Open
Driver Squib Circuit Shorted
Driver Squib Short to Battery
Driver Squib Short to Ground
Loss of Ignition-Run only
