lock INFINITI QX56 2006 Factory Service Manual

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REAR WIPER AND WASHER SYSTEM
Revision: November 20092006 QX56
REAR WIPER AND WASHER SYSTEMPFP:28710
Components Parts and Harness Connector LocationEKS00BEB
System DescriptionEKS00BEC

The wiper switch (combination switch) is composed of a combination of 5 output terminals and 5 input ter-
minals. Terminal combination status is read by the BCM (body control module) when switch is turned ON.

The BCM controls rear wiper ON and INT (intermittent) operation.
Power is supplied at all times

through 50A fusible link (letter f , located in fusible link box)

to BCM terminal 70.
With the ignition switch in ON or START position, power is supplied

through 10A fuse [No. 9, located in fuse block (J/B)]

to combination switch terminal 14, and

through 10A fuse (No. 59, located in the fuse and relay box)

to BCM terminal 38.
Ground is supplied

to BCM terminal 67 and

to combination switch terminal 12

through grounds M57, M61 and M79.
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REAR WIPER OPERATION
When the ignition switch is in the ON or START position, and the rear wiper switch is in the ON position, the
BCM detects a rear wiper ON request through the combination switch (wiper switch) reading function.
The BCM will first check the status of the glass hatch ajar switch before supplying power to the rear wiper
motor. If the glass hatch ajar switch is closed (ground) the BCM will not turn on the rear wiper motor. If the
glass hatch ajar switch is open (not grounded) the BCM will control the rear wiper motor as follows.
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

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 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 rear door glass ajar signal during rear wiper motor operation, the BCM will operate the
rear wiper motor to the auto stop position. Once the rear door glass ajar 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.

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REAR WIPER AND WASHER SYSTEM
Revision: November 20092006 QX56
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

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

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REAR WIPER AND WASHER SYSTEM
Revision: November 20092006 QX56
Terminals and Reference Values for BCMEKS00BEE
Te r m i -
nal No. Wire
color Signal name Measuring condition
Reference Value (V)
(Approx.)
Ignition
switch Operation or condition
2 SB Combination switch input 5 ON

Light switch and wiper switch OFF

Wiper dial position 4
3 G/Y Combination switch input 4 ON

Light switch and wiper switch OFF

Wiper dial position 4
4 Y Combination switch input 3 ON

Light switch and wiper switch OFF

Wiper dial position 4
5 G/B Combination switch input 2 ON

Light switch and wiper switch OFF

Wiper dial position 4
6 V Combination switch input 1 ON
26 Y/L Rear wiper auto stop
switch 2
ONRise up position (rear wiper arm on
stopper) 0V
A Position (full clockwise stop position) 0V
Forward sweep (counterclockwise direction) Fluctuating
B Position (full counterclockwise stop position) Battery voltage
Reverse sweep (clockwise direction) Fluctuating
32 R/G Combination switch output 5 ON

Light switch and wiper switch OFF

Wiper dial position 4
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33 R/Y Combination switch output 4 ON
Light switch and wiper switch OFF

Wiper dial position 4
34 L Combination switch output 3 ON

Light switch and wiper switch OFF

Wiper dial position 4
35 O/B Combination switch output 2 ON

Light switch and wiper switch OFF

Wiper dial position 4
36 R/W Combination switch output 1 ON
38 W/L Ignition switch (ON) ON— Battery voltage
42 GR Glass hatch ajar switch
signal ONHatch glass closed
Battery voltage
Hatch glass open 0V
44 O Rear wiper auto stop
switch 1 ONRise up position (rear wiper arm on
stopper) 0V
A Position (full clockwise stop position) Battery voltage
Forward sweep (counterclockwise direction) Fluctuating
B Position (full counterclockwise stop position) 0V
Reverse sweep (clockwise direction) Fluctuating
54 Y Rear wiper output circuit 2 ON Rise up position (rear wiper arm on
stopper) 0V
A Position (full clockwise stop position) 0V
Forward sweep (counterclockwise direction) 0V
B Position (full counterclockwise stop position) Battery voltage
Reverse sweep (clockwise direction) Battery voltage
Te r m i -
nal No. Wire
color Signal name Measuring condition
Reference Value (V)
(Approx.)
Ignition
switch Operation or condition
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REAR WIPER AND WASHER SYSTEM
Revision: November 20092006 QX56
How to Proceed With Trouble DiagnosisEKS00BEF
1. Confirm the symptoms and customer complaint.
2. Understand operation description and function description. Refer to WW-32, "
System Description" .
3. Perform the Preliminary Check. Refer to WW-40, "
Preliminary Inspection" .
4. Check symptom and repair or replace the cause of malfunction.
5. Does the rear wiper operate normally? If YES: GO TO 6. If NO: GO TO 4.
6. Inspection End.
Preliminary InspectionEKS00BEG
INSPECTION FOR POWER SUPPLY AND GROUND CIRCUIT
Inspection procedure
1. CHECK FUSE
Check if wiper or washer fuse is blown.
OK or NG
OK >> GO TO 2.
NG >> If fuse is blown, be sure to eliminate cause of problem before installing new fuse. Refer to PG-4,
"POWER SUPPLY ROUTING CIRCUIT" .
55 SB Rear wiper output circuit 1 ONRise up position (rear wiper arm on
stopper) 0V (except battery voltage at ini-
tial rear wiper ON to lift arm off
stop)
A Position (full clockwise stop position) Battery voltage
Forward sweep (counterclockwise direction) Battery voltage
B Position (full counterclockwise stop position) 0V
Reverse sweep (clockwise direction) 0V
67 B Ground ON— 0V
70 W/B Battery power OFF— Battery voltage
Te r m i -
nal No. Wire
color Signal name Measuring condition
Reference Value (V)
(Approx.)
Ignition
switch Operation or condition
Unit
Power source Fuse No.
Front and rear washer motor Ignition ON or START 9
BCM Ignition ON or START
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REAR WIPER AND WASHER SYSTEM
Revision: November 20092006 QX56
7. CHECK COMBINATION SWITCH INPUT SIGNAL
Select "BCM" on CONSULT-II. With "WIPER" data monitor, make
sure "RR WIPER INT", "RR WIPER ON" turn ON-OFF according to
operation of wiper switch.
OK or NG
OK >> Replace BCM. Refer to BCS-20, "BCM" .
NG >> Check the wiper switch. Refer to WW-6, "
COMBINA-
TION SWITCH READING FUNCTION" .
Rear Wiper Stop Position Is IncorrectEKS00BEJ
1. CHECK AUTO STOP SWITCH INPUT SIGNALS
Select "BCM" on CONSULT-II. With "WIPER" data monitor, make
sure "RR WIPER STOP" and "RR AUTO STOP 2" turn ON-OFF
according to wiper operation.
OK or NG
OK >> Replace BCM. Refer to BCS-20, "BCM" .
NG >> GO TO 2.
2. CHECK AUTO STOP CIRCUITS FOR SHORT TO GROUND
1. Turn ignition switch to OFF.
2. Disconnect BCM and rear wiper motor connectors.
3. Check continuity between BCM harness connector terminals and ground.
OK or NO
OK >> GO TO 3.
NO >> Repair harness or connector. When wiper switch is in
INT position
: RR WIPER INT ON
When wiper switch is in
ON position : RR WIPER ON
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When wiper switch is OFF
and arm on stop : RR WIPER STOP ON
: RR AUTO STOP 2 ON
When wiper switch is ON and arm in position A : RR WIPER STOP OFF
: RR AUTO STOP 2 ON
When wiper switch is ON counterclockwise sweep : RR WIPER STOP OFF
: RR AUTO STOP 2 OFF
When wiper switch is ON and arm in position B : RR WIPER STOP ON
: RR AUTO STOP 2 OFF
When wiper switch is ON clockwise sweep : RR WIPER STOP OFF
: RR AUTO STOP 2 OFF
When wiper switch is ON and arm in position A : RR WIPER STOP ON
: RR AUTO STOP 2 OFF
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Terminals
Continuity
Connector Terminal
M18 26
Ground No
M19 44
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REAR WIPER AND WASHER SYSTEM
Revision: November 20092006 QX56
Rear Wiper Motor EKS00BEO
REMOVAL AND INSTALLATION
REMOVAL
1. Remove wiper arm. Refer to WW-49, "Rear Wiper Arm" .
2. Remove pivot cap.
3. Remove back door lock assembly. Refer to BL-136, "
Door Lock Assembly" .
4. Disconnect rear wiper motor connector.
5. Remove rear wiper motor bolts, and remove rear wiper motor.
INSTALLATION
CAUTION:

Do not drop the wiper motor or cause it to contact other parts.
1. Install rear wiper motor to the vehicle.
2. Connect rear wiper motor connector.
3. Install back door lock assembly. Refer to BL-135, "
BACK DOOR LOCK" .
4. Install pivot cap.
5. Install wiper arm. Refer to WW-49, "
Rear Wiper Arm" .
Rear Washer Nozzle AdjustmentEKS00BEP

This vehicle is equipped with a non-adjustable rear washer nozzle.

If not satisfied with washer fluid spray coverage, confirm that the washer nozzle is installed correctly.

If the washer nozzle is installed correctly, and the washer fluid spray coverage is not satisfactory, replace
the washer nozzle.
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1. Wiper arm cover 2. Wiper arm and blade 3. Pivot cap
4. Rear wiper motor 5. Wiper arm stop 6. Rear wiper arm nut