Air INFINITI QX56 2004 Factory Service Manual

REAR WIPER AND WASHER SYSTEM
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Revision: August 20072004 QX56
How to Proceed With Trouble DiagnosisEKS007FS
1. Confirm the symptoms and customer complaint.
2. Understand operation description and function description. Refer to WW-33, "
System Description" .
3. Perform the Preliminary Check. Refer to WW-41, "
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 InspectionEKS007FT
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 or fusible link is blown, be sure to eliminate cause of malfunction before installing new fuse
or fusible link. 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
colorSignal nameMeasuring condition
Reference Value (V)
(Approx.) Ignition
switchOperation or condition
Unit Power source Fuse and fusible link No.
Front and rear washer motor Ignition ON or START 9
BCMIgnition ON or START 59
Batteryf

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REAR WIPER AND WASHER SYSTEM
Revision: August 20072004 QX56
2. CHECK POWER SUPPLY CIRCUIT
1. Disconnect BCM connectors.
2. Check voltage between BCM harness connector terminals and
ground.
OK or NG
OK >> GO TO 3.
NG >> Check harness for open between BCM and fuse or fusible link.
3. GROUND CIRCUIT INSPECTION (BCM)
Check for continuity between the BCM terminal and ground.
OK or NG
OK >> Inspection End.
NG >> Repair/replace BCM ground circuit.
BCM
(–)Ignition switch position
(+)
OFF ON
ConnectorTe r m i n a l
(Wire color)
M18 38 (W/L)
Ground0V Battery voltage
M20 70 (W/B) Battery voltage Battery voltage
WKIA2089E
BCM
Ignition switch
conditionContinuity
ConnectorTe r m i n a l
(wire color)
M20 67 (B) Ground OFF Yes
WKIA2090E

REAR WIPER AND WASHER SYSTEM
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Display Item List
Rear Wiper Does Not OperateEKS007FV
1. REAR WIPER ACTIVE TEST
1. Select "BCM" on CONSULT-II, and select "WIPER" on "SELECT
TEST ITEM" screen.
2. Select "ACTIVE TEST" on "SELECT DIAG MODE" screen.
3. Select "RR WIPER" on "SELECT TEST ITEM" screen.
4. Make sure rear wiper operates.
OK or NG
OK >> GO TO 7.
NG >> GO TO 2.
2. CHECK REAR WIPER MOTOR CIRCUITS
1. Turn ignition switch OFF.
2. Disconnect BCM connector and rear wiper motor connector.
3. Check continuity between BCM harness connector terminals
and rear wiper motor harness connector terminals.
OK or NO
OK >> GO TO 3.
NO >> Repair harness or connector.
3. CHECK GLASS HATCH AJAR SWITCH
1. Make sure hatch glass is closed.
2. Check continuity between BCM connector M19 terminal 42 (GR)
and ground.
OK or NG
OK >> GO TO 4.
NG >> Repair harness if shorted. If not, refer to BL-93, "
Door
Switch Check" for further glass hatch ajar switch diag-
nosis.
Test item Display on CONSULT-II screen Description
Front wiper HI output FR WIPER (HI) Front wiper HI can be operated by any ON-OFF operation.
Front wiper LO output FR WIPER (LO) Front wiper LO can be operated by any ON-OFF operation.
Front wiper INT output FR WIPER (INT) Front wiper INT can be operated by any ON-OFF operation.
Rear wiper output RR WIPER Rear wiper can be operated by any ON-OFF operation.
Wiper should operate.
SKIA3503E
BCM Rear wiper motor
Continuity
ConnectorTerminal
(wire color)ConnectorTe r m i n a l
(wire color)
M1955 (SB)
D7044 (SB)
Ye s
54 (Y) 6 (Y)
WKIA2091E
Continuity should not exist.
WKIA2092E

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REAR WIPER AND WASHER SYSTEM
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4. CHECK REAR WIPER MOTOR AUTO STOP CIRCUITS
1. Disconnect BCM connector M18.
2. Check continuity between BCM harness connector terminals
and rear wiper motor harness connector terminals.
OK or NO
OK >> GO TO 5.
NO >> Repair harness or connector.
5. CHECK REAR WIPER MOTOR AUTO STOP SWITCH GROUNDS
Check continuity between rear wiper motor harness connector D704
terminals and ground.
OK or NG
OK >> GO TO 6.
NG >> Repair harness or connector.
6. CHECK REAR WIPER OPERATING
1. Connect BCM connectors and rear wiper motor connector.
2. Turn ignition switch ON.
3. Select “RR WIPER” during "ACTIVE TEST". Refer to WW-44,
"ACTIVE TEST" . When rear wiper is operating, check voltage
between BCM connector terminals.
OK or NG
OK >> Replace rear wiper motor. Refer to WW-51, "Removal and Installation of Rear Wiper Motor" .
NG >> Replace BCM. Refer to BCS-19, "
Removal and Installation of BCM" .
BCM Rear wiper motor
Continuity
ConnectorTe r m i n a l
(wire color)ConnectorTe r m i n a l
(wire color)
M18 26 (Y/L)
D7041 (Y/L)
Ye s
M19 44 (O) 2 (O)
WKIA2093E
Rear wiper motor
Continuity
ConnectorTe r m i n a l
(wire color)
D7043 (B)
Ground Yes
5 (B)
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BCM
(–) ConditionVoltage
(Approx.) (+)
ConnectorTerminal
(wire color)
M1954 (Y)
GroundOperating Fluctuating
55 (SB)End of travel
(stopped)0V
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REAR WIPER AND WASHER SYSTEM
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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-19, "Removal and Installa-
tion of BCM" .
NG >> Check the wiper switch. Refer to BCS-3, "
COMBINA-
TION SWITCH READING FUNCTION" .
Rear Wiper Stop Position Is IncorrectEKS007FW
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-19, "Removal and Installation of 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 ON
SKIA4243E
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
WKIA1418E
BCM
Continuity
ConnectorTe r m i n a l
(wire color)
M18 26 (Y/L)
Ground No
M19 44 (O)
WKIA2096E

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REAR WIPER AND WASHER SYSTEM
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3. CHECK REAR WIPER MOTOR AUTO STOP SWITCH GROUNDS
Check continuity between rear wiper motor harness connector D704
terminals and ground.
OK or NG
OK >> GO TO 4.
NG >> Repair harness or connector.
4. CHECK REAR WIPER OPERATING
1. Connect BCM connectors and rear wiper motor connector.
2. Turn ignition switch ON.
3. Turn rear wiper switch ON, then to OFF when wiper arm
reaches mid sweep.
4. Check voltage between rear wiper motor connector D704 termi-
nal 6 (Y) and ground.
OK or NG
OK >> Replace rear wiper motor. Refer to WW-51, "Removal
and Installation of Rear Wiper Motor" .
NG >> Replace BCM. Refer to BCS-19, "
Removal and Installation of BCM" .
Only Rear Wiper Does Not OperateEKS007FX
1. CHECK COMBINATION SWITCH INPUT SIGNAL
Select “BCM” on CONSULT-II. With “WIPER” data monitor, make
sure “RR WIPER ON” turns ON-OFF according to operation of wiper
switch.
OK or NG
OK >> Replace BCM. Refer to BCS-19, "Removal and Installa-
tion of BCM" .
NG >> Check the wiper switch. Refer to BCS-3, "
COMBINA-
TION SWITCH READING FUNCTION" .
Rear wiper motor
Continuity
ConnectorTe r m i n a l
(wire color)
D7041 (Y/L)
GroundNo
2 (O)
3 (B)
Ye s
5 (B)
WKIA2097E
Battery voltage should exist on the reverse wipe
until arm is seated in the stop.
WKIA2098E
When rear wiper switch is in
ON position: RR WIPER ON ON
SKIA4248E