Stop INFINITI QX56 2008 Factory Service Manual

FRONT WIPER AND WASHER SYSTEMWW-5
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• BCM transmits the front wiper request signal (INT) to IPDM E/R with CAN communication according to the
front wiper INT operation condition and the intermittent operation delay interval judged value.
Front wiper INT operating condition- Ignition switch ON
- Front wiper switch INT
Intermittent operation delay interval judgment- BCM calculates the intermittent operation delay inte rval from the vehicle speed signal received from the
wiper dial position and the combination meter with CAN communication.
• IPDM E/R turns the integrated front wiper relay ON so that the front wiper is operated only once according to the front wiper request signal (INT).
• BCM detects stop position/except st op position of the front wiper motor according to the front wiper stop
position signal received from IP DM E/R with CAN communication.
• BCM transmits the front wiper request signal (INT) again after the intermittent operation delay interval after the front wiper motor is stopped.
FRONT WIPER AUTO STOP OPERATION
• BCM stops transmitting the front wiper request si gnal when the front wiper switch is turned OFF.
• IPDM E/R detects the front wiper auto stop signal fr om the front wiper motor and detects the front wiper
motor position (stop positi on/except stop position).
Wiper intermittent dial posi-
tion Intermittent
operation interval Intermittent operation delay Interval (s)
Vehicle speed
Vehicle stopped or less than 5 km/h (3.1 MPH) 5 km/h (3.1 MPH)
or more or less
than 35 km/h (21.7 MPH) 35 km/h (21.7
MPH) or more or
less than 65 km/h (40.4 MPH) 65 km/h (40.4
MPH) or more
1S hort
↑
↓
Long 0.8
0.60.40.24
2 4321 .2
31 07.5 5 3
41 612 84.8
5 241 8127.2
6 322 4169.6
7 423 1.52 11 2.6
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< FUNCTION DIAGNOSIS >
FRONT WIPER AND WASHER SYSTEM
• When the front wiper request signal is stopped, IPDM E/R turns ON the front wiper relay until the front wiper
motor returns to the stop position.
NOTE:
• BCM stops the transmitting of the front wiper request signal when the ignition switch is OFF.
• IPDM E/R turns the front wiper relay OFF when the ignition switch is OFF.
FRONT WIPER OPERATION LINKED WITH WASHER
• BCM transmits the front wiper request signal (LO) to IPDM E/R with CAN communication according to the
washer linked operating condition of the front wiper.
• BCM transmits the front wiper request signal (LO) so that the front wiper operates approximately 3 times when the front washer s witch OFF is detected.
Washer linked operating condition of front wiper
- Ignition switch ON
- Front washer switch ON (0.4 second or more)
• IPDM E/R turns ON the integrated front wiper rela y according to the front wiper request signal (LO).
• The front and rear washer motor is grounded through the combination switch with the front washer switch
ON.
FRONT WIPER DROP WIPE OPERATION
• BCM controls the front wiper to operate once accordi ng to the conditions of front wiper drop wipe operation.
Front wiper drop wipe operating condition- Ignition switch ON
- Front wiper switch OFF
- Front washer switch OFF
• BCM transmits the front wiper request signal (LO) to IPDM E/R with CAN communication so that the front
wiper operate once three seconds after front wiper operation linked with washer.
• IPDM E/R turns ON the integrated front wiper rela y according to the front wiper request signal (LO).
FRONT WIPER FAIL−SAFE OPERATION
• IPDM E/R performs the fail-safe function when the front wiper auto stop circuit is malfunctioning. Refer to
WW-65, "
FailSafe".
JPLIA0095GB
Revision: March 2010 2008 QX56

FRONT WIPER AND WASHER SYSTEMWW-7
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Component Parts LocationINFOID:0000000001735567
Component DescriptionINFOID:0000000001735568
1. IPDM E/R E121, E122, E124 2. Air cleaner case 3. Front and rear washer motor E105
4. Washer fluid reservoir 5. Front wiper motor E23
(view with cowl top removed) 6. Combination switch M28
7. BCM M18, M20
ALLIA0841ZZ
Part Description
BCM • Judges each switch status by the combination switch reading function.
• Requests (with CAN communication) the front wiper relay and the front wiper high relay ON to
IPDM E/R.
IPDM E/R • Controls the integrated relay according to the request (with CAN communication) from BCM.
• Performs the auto stop control of the front wiper.
Combination switch
(Wiper and washer
switch) Refer to WW-4, "
System Diagram".
Combination meter Transmits the vehicle speed signal to BCM with CAN communication.
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< FUNCTION DIAGNOSIS >
REAR WIPER AND WASHER SYSTEM
REAR WIPER AND WASHER SYSTEM
System DiagramINFOID:0000000001735569
System DescriptionINFOID:0000000001735570
OUTLINE
The rear wiper is controlled by each function of BCM.
Control by BCM• Combination switch reading function
• Rear wiper control function
REAR WIPER BASIC OPERATION
• BCM detects the combination switch condition by the combination switch reading function.
• BCM controls the rear wiper to start or stop.
REAR WIPER ON OPERATION
• BCM supplies power to the rear wiper motor ac cording to the rear wiper ON operating condition.
Rear wiper ON operating condition
- Ignition switch ON
- Rear wiper switch ON
REAR WIPER INT OPERATION
• BCM supplies power to the rear wiper motor according to the INT operating condition.
Rear wiper INT operating condition- Ignition switch ON
- Rear wiper switch INT
• BCM controls the rear wiper to operate once.
• BCM detects the rear wiper motor stopping position.
• BCM supplies power to the rear wiper motor after an intermittent from the stop of the rear wiper motor.
REAR WIPER AUTO STOP OPERATION
• BCM stops supplying power to the rear wiper motor when the rear wiper switch is turned OFF.
ALLIA0271GB
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Revision: March 2010 2008 QX56

REAR WIPER AND WASHER SYSTEMWW-9
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• BCM reads an auto stop signal from the rear wiper motor to detect a rear wiper motor position.
• When the rear wiper motor is at other than the stopping position, BCM continues to supply power to the rear
wiper motor until it returns to the stopping position.
NOTE:
BCM stops supplying power to the rear wiper motor when the ignition switch is turned OFF.
REAR WIPER OPERATION LINKED WITH WASHER
• BCM supplies power to the rear wiper motor according to the washer linked operating condition of rear
wiper. When the rear washer switch is turned OFF, BC M controls rear wiper to operate approximately three
times.
Washer linked operating condition of rear wiper- Ignition switch ON
- Rear washer switch ON (0.4 second or more)
• Front and rear washer motor becomes grounded through the combination switch when the rear washer switch is turned ON.
REAR WIPER DROP WIPE OPERATION
• BCM controls the rear wiper to operate once acco rding to the rear wiper drop wipe operating condition.
Rear wiper drop wipe operating condition
- Ignition switch ON
- Rear wiper switch OFF
- Rear washer switch OFF
• BCM controls the rear wiper so that it operates onc e time approximately three seconds later after the washer
interlocking operation of the rear wiper.
REAR WIPER FAIL −SAFE OPERATION
BCM performs the fail-safe function when the rear wi per auto stop circuit is malfunctioning. Refer to WW-52,
"FailSafe".
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< FUNCTION DIAGNOSIS >
REAR WIPER AND WASHER SYSTEM
Component Parts Location
INFOID:0000000001735571
Component DescriptionINFOID:0000000001735572
1. Steering column (v iew with instrument
panel removed) 2. BCM M18, M19, M20
3. Rear washer nozzle
4. Rear wiper motor D704 5. Air cleaner case6. Front and rear washer motor connector
E105
7. Washer fluid reservoir 8. Combination switch M28 9. Glass hatch ajar switch D707
ALLIA0842ZZ
Part Description
BCM • Judges each switch status by the combination switch reading function.
• Supplies power to the rear wiper motor.
• Performs the auto stop control of the rear wiper.
Combination switch
(Wiper and washer switch) Refer to BCS-7, "
System Diagram".
Revision: March 2010
2008 QX56

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< FUNCTION DIAGNOSIS >
DIAGNOSIS SYSTEM (BCM)
*: Factory setting
DATA MONITOR
ACTIVE TEST
Work ItemSetting
Item Description
WIPER SPEED
SETTING ON*
With vehicle speed
(Front wiper intermittent time linked with the vehicle speed and wiper intermittent dial position)
OFF Without vehicle speed
(Front wiper intermittent time linked with the wiper intermittent dial position)
Monitor Item
[Unit] Description
IGN ON SW [ON/OFF] Ignition switch ON status judged from ignition power supply
FR WIPER HI [ON/OFF]
Each switch status that BCM judges from the combination switch reading function
FR WIPER LOW [ON/OFF]
FR WIPER INT [ON/OFF]
FR WASHER SW [ON/OFF]
INT VOLUME [1 - 7]
Each switch status that BCM judges from the combination switch reading function
FR WIPER STOP [ON/OFF] Front wiper motor (stop position) status received from IPDM E/R with CAN communica-
tion
VEHICLE SPEED [km/h] The value of the vehicle speed signal received from combination meter with CAN com-
munication
RR WIPER ON [ON/OFF] Each switch status that BCM judges from the combination switch reading function
RR WIPER INT [ON/OFF]
RR WASHER SW [ON/OFF]
RR WIPER STOP [ON/OFF] Rear wiper motor (stop position) status input from the rear wiper motor
Test Item Operation Description
FR WIPER HI
Transmits the front wiper request signal (HI) to IPDM E/R with CAN communication to op-
erate the front wiper HI operation.
LO Transmits the front wiper request signal (LO) to IPDM E/R with CAN communication to
operate the front wiper LO operation.
INT Transmits the front wiper request signal (INT) to IPDM E/R with CAN communication to
operate the front wiper INT operation.
OFF Stops transmitting the front wiper request signal to stop the front wiper operation.
RISE UP WIPER
TEST ON Outputs the voltage to operate the rear wiper motor.
OFF Stops the voltage to stop.
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< FUNCTION DIAGNOSIS >
DIAGNOSIS SYSTEM (IPDM E/R)
ACTIVE TEST
Te s t i t e m
Monitor Item[Unit] MAIN SIG-
NALS Description
MOTOR FAN REQ
[1/2/3/4] ×Displays the status of the cooling fan speed request signal received from ECM via
CAN communication.
A/C COMP REQ
[OFF/ON] ×Displays the status of the A/C request signal received from AV control unit via
CAN communication.
TA I L & C L R R E Q
[OFF/ON] ×
Displays the status of the position light request signal received from BCM via CAN
communication.
HL LO REQ
[OFF/ON] ×Displays the status of the low beam request signal received from BCM via CAN
communication.
HL HI REQ
[OFF/ON] ×Displays the status of the high beam request signal received from BCM via CAN
communication.
FR FOG REQ
[OFF/ON] ×
Displays the status of the front fog lamp request signal received from BCM via
CAN communication.
HL WASHER REQ
[OFF/ON] NOTE:
This item is displayed, but cannot be monitored.
FR WIP REQ
[STOP/1LOW/LOW/HI] ×Displays the status of the front wiper request signal received from BCM via CAN
communication.
WIP AUTO STOP
[STOP P/ACT P] ×
Displays the status of the front wiper auto stop signal judged by IPDM E/R.
WIP PROT
[OFF/Block] ×
Displays the status of the front wiper fail-safe operation judged by IPDM E/R.
ST RLY REQ
[OFF/ON] Displays the status of the starter request signal received from ECM via CAN com-
munication.
IGN RLY
[OFF/ON] ×
Displays the status of the ignition relay judged by IPDM E/R.
RR DEF REQ
[OFF/ON] ×Displays the status of the rear defogger request signal received from AV control
unit via CAN communication.
OIL P SW
[OPEN/CLOSE] Displays the status of the oil pressure switch judged by IPDM E/R.
DTRL REQ
[OFF] Displays the status of the daytime light request signal received from BCM via CAN
communication.
HOOD SW
[OPEN/CLOSE] Displays the status of the hood switch judged by IPDM E/R.
THFT HRN REQ
[OFF/ON] Displays the status of the theft warning horn request signal received from BCM
via CAN communication.
HORN CHIRP
[OFF/ON] Displays the status of the horn reminder signal received from BCM via CAN com-
munication.
Test item
Operation Description
REAR DEFOGGER OFF
OFF
ON Operates rear window defogger relay.
FRONT WIPER OFF
OFF
LO Operates the front wiper relay.
HI Operates the front wiper relay and front wiper high relay.
MOTOR FAN 1O
FF
2O FF
3 Operates the cooling fan relay.
4 Operates the cooling fan relay.
Revision: March 2010 2008 QX56

FRONT WIPER MOTOR LO CIRCUITWW-19
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FRONT WIPER MOTOR LO CIRCUIT
Component Function CheckINFOID:0000000001735579
1. CHECK FRONT WIPER LO OPERATION
IPDM E/R AUTO ACTIVE TEST
1. Start IPDM E/R auto active test. Refer to PCS-12, "
Diagnosis Description".
2. Check that the front wiper operates at the LO operation.
CONSULT-III ACTIVE TEST
1. Select "FRONT WIPER" of IPDM E/R active test item.
2. While operating the test item, check front wiper operation.
Is front wiper (LO) operation normal?
YES >> Front wiper motor LO circuit is normal.
NO >> Refer to WW-19, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001735580
1. CHECK FRONT WIPER MOTOR FUSE
1. Turn the ignition switch OFF.
2. Check that the following fuse is not blown.
Is the fuse blown?
YES >> GO TO 2
NO >> GO TO 3
2. CHECK FRONT WIPER MOTOR (LO) SHORT CIRCUIT
1. Disconnect IPDM E/R and front wiper motor.
2. Check continuity between IPDM E/R harness connector and ground.
Does continuity exist?
YES >> Repair or replace harness.
NO >> Replace the fuse. (Replace IPDM E/R if the fuse is blown again.)
3. CHECK FRONT WIPER MOTOR (LO) OUTPUT VOLTAGE
CONSULT-III ACTIVE TEST LO : Front wiper (LO) operation
OFF : Stop the front wiper.
Unit Location Fuse No. Capacity
Front wiper motor IPDM E/R39 30 A
IPDM E/R
GroundContinuity
Connector Terminal
E121 32 No
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Revision: March 2010 2008 QX56

FRONT WIPER MOTOR HI CIRCUITWW-21
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FRONT WIPER MOTOR HI CIRCUIT
Component Function CheckINFOID:0000000001735581
1. CHECK FRONT WIPER HI OPERATION
IPDM E/R AUTO ACTIVE TEST
1. Start IPDM E/R auto active test. Refer to PCS-12, "
Diagnosis Description".
2. Check that the front wiper operates at the HI operation.
CONSULT-III ACTIVE TEST
1. Select "FRONT WIPER" of IPDM E/R active test item.
2. While operating the test item, check front wiper operation.
Is front wiper (HI) operation normal?
YES >> Front wiper motor HI circuit is normal.
NO >> Refer to WW-21, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001735582
1. CHECK FRONT WIPER MOTOR FUSE
1. Turn the ignition switch OFF.
2. Check that the following fuse is not blown.
Is the fuse blown?
YES >> GO TO 2
NO >> GO TO 3
2. CHECK FRONT WIPER MOTOR (HI) SHORT CIRCUIT
1. Disconnect IPDM E/R and front wiper motor.
2. Check continuity between IPDM E/R harness connector and ground.
Does continuity exist?
YES >> Repair or replace harness.
NO >> Replace the fuse. (Replace IPDM E/R if the fuse is blown again.)
3. CHECK FRONT WIPER MOTOR (HI) OUTPUT VOLTAGE
CONSULT-III ACTIVE TEST HI : Front wiper (HI) operation
OFF : Stop the front wiper.
Unit Location Fuse No. Capacity
Front wiper motor IPDM E/R39 30 A
IPDM E/R
GroundContinuity
Connector Terminal
E121 35 No
ALLIA0448ZZ
Revision: March 2010 2008 QX56