Revers INFINITI QX56 2004 Factory Service Manual

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Page 3347 of 3371

INFINITI QX56 2004 Factory Service Manual WW-34
REAR WIPER AND WASHER SYSTEM
Revision: August 20072004 QX56
Power is supplied to output circuit 1 for forward operation (counterclockwise sweep),
through BCM terminal 55
to rear wiper motor t

WW-34
REAR WIPER AND WASHER SYSTEM
Revision: August 20072004 QX56
Power is supplied to output circuit 1 for forward operation (counterclockwise sweep),
through BCM terminal 55
to rear wiper motor terminal 4.
Ground is supplied
to rear wiper motor terminal 6
through BCM terminal 54
through BCM terminal 67
through grounds M57, M61 and M79.
With output circuit 1 power and ground supplied, the rear wiper motor operates in a counterclockwise sweep
direction until auto stop switch 1 closes (full sweep position [position B]). Auto stop switch 1 supplies ground
to BCM terminal 44
through rear wiper motor terminal 2
through rear wiper motor terminal 5
through grounds B117 and B132.
When the BCM receives this ground signal it turns off output circuit 1 and turns on output circuit 2.
Power is supplied to output circuit 2 for reverse operation (clockwise sweep),
through BCM terminal 54
to rear wiper motor terminal 6.
Ground is supplied
to rear wiper motor terminal 4
through BCM terminal 55
through BCM terminal 67
through grounds M57, M61 and M79.
With output circuit 2 power and ground supplied the rear wiper motor operates in a clockwise sweep direction
until auto stop switch 2 closes (full sweep position [position A]). Auto stop switch 2 supplies ground
to BCM terminal 26
through rear wiper motor terminal 1
through rear wiper motor terminal 3
through grounds B117 and B132.
When the BCM receives this ground signal it turns off output circuit 2 and turns on output circuit 1. This pro-
cess repeats until the rear wiper switch or ignition switch is turned off.
If the ignition switch is turned to OFF during operation, the rear wiper motor will immediately stop. If the igni-
tion switch is turned ON after this condition, and the BCM does not receive a rear wiper switch ON or INT sig-
nal, the BCM will operate the rear wiper to the auto stop position.
If the BCM does not receive a change in status in either auto stop switch 1 or auto stop switch 2 within a 5 sec-
ond period of output circuit 1 or output circuit 2 operation, the BCM will turn off output circuit 1 and output cir-
cuit 2.
If the BCM detects the glass hatch ajar switch signal during rear wiper motor operation, the BCM will operate
the rear wiper motor to the auto stop position. Once the glass hatch ajar switch signal returns to open (not
grounded) for 5 or more seconds, the BCM will resume rear wiper motor operation.
INTERMITTENT OPERATION
The rear wiper motor operates the wiper arm at low speed approximately every 7 seconds.
When the wiper switch is in the rear wiper INT position, the BCM detects a rear wiper INT request through the
combination switch (wiper switch) reading function.
The BCM controls rear wiper motor operation by switching direction of current flow between the two rear wiper
motor output circuits.
Power is supplied to output circuit 1 for forward operation (counterclockwise sweep),
through BCM terminal 55
to rear wiper motor terminal 4.
Ground is supplied
to rear wiper motor terminal 6
through BCM terminal 54

Page 3348 of 3371

INFINITI QX56 2004 Factory Service Manual REAR WIPER AND WASHER SYSTEM
WW-35
C
D
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F
G
H
I
J
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MA
B
WW
Revision: August 20072004 QX56
through BCM terminal 67
through grounds M57, M61 and M79.
With output circuit 1 power and ground supplied,

REAR WIPER AND WASHER SYSTEM
WW-35
C
D
E
F
G
H
I
J
L
MA
B
WW
Revision: August 20072004 QX56
through BCM terminal 67
through grounds M57, M61 and M79.
With output circuit 1 power and ground supplied, the rear wiper motor operates in a counterclockwise sweep
direction until auto stop switch 1 closes (full sweep position). Auto stop switch 1 supplies ground
to BCM terminal 44
through rear wiper motor terminal 2
through rear wiper motor terminal 5
through grounds B117 and B132.
When the BCM receives this ground signal it turns off output circuit 1 and turns on output circuit 2.
Power is supplied to output circuit 2 for reverse operation (clockwise sweep),
through BCM terminal 54
to rear wiper motor terminal 6.
Ground is supplied
to rear wiper motor terminal 4
through BCM terminal 55
through BCM terminal 67
through grounds M57, M61 and M79.
With output circuit 2 power and ground supplied the rear wiper motor operates in a clockwise sweep direction
until auto stop switch 2 closes (full sweep position). Auto stop switch 2 supplies ground
to BCM terminal 26
through rear wiper motor terminal 1
through rear wiper motor terminal 3
through grounds B117 and B132.
When the BCM receives this ground signal it turns off output circuit 2 and starts the timing function of 7 sec-
onds. After approximately 7 seconds the BCM turns on output circuit 1. This process repeats until the rear
wiper switch or ignition switch is turned off.
AUTO STOP OPERATION
When the rear wiper switch is turned off, the BCM will continue the cycle of output circuit 1 or output circuit 2
until auto stop switch 1 and auto stop switch 2 are both in the closed position. When the BCM receives ground
signals from auto stop switch 1 and auto stop switch 2 simultaneously, output circuit 1 and output circuit 2 are
both turned off.
REAR WASHER OPERATION
When the ignition switch is in the ON or START position, and the front and rear washer switches are OFF, the
front and rear washer motor is supplied power
through 10A fuse [No. 9, located in the fuse block (J/B)]
through combination switch (wiper switch) terminal 14
through combination switch (wiper switch) terminal 11
to front and rear washer motor terminal 2, and
through combination switch (wiper switch) terminal 13
to front and rear washer motor terminal 1.
When the rear wiper switch is in rear washer position, the BCM detects a rear washer signal by BCM wiper
switch reading function. Combination switch ground is supplied
to front and rear washer motor terminal 1
through combination switch (wiper switch) terminal 13
through combination switch (wiper switch) terminal 12
through grounds M57, M61 and M79.
With ground supplied, the front and rear washer motor is operated in the rear direction.
When the BCM detects that the rear washer motor has operated for 0.4 seconds or longer, BCM operates the
rear wiper motor.
When the BCM detects that the rear washer switch is in OFF, the rear wiper motor cycles approximately 3
times and then stops.