ground INFINITI QX56 2011 Factory Service Manual

SYSTEMWW-9
< SYSTEM DESCRIPTION >
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 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 via 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 2 times
when the front washer switch 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 washer pump is grounded through the combinati on switch with the front washer switch ON.
FRONT WIPER DROP WIPE OPERATION
 BCM controls the front wiper to operate once according 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 fr ont wiper operation linked with washer.
 IPDM E/R turns ON the integrated front wiper rela y according to the front wiper request signal (LO).
WIPER LINKED AUTO LIGHTING FUNCTION
When light switch is in the AUTO position, front wiper operates, and then headlamp illuminates. Refer to EXL-
11 , "AUTO LIGHT SYSTEM : System Description (For CANADA)" or EXL-12, "AUTO LIGHT SYSTEM : Sys-
tem Description (Except for CANADA)".
FRONT WIPER AND WASHER SYSTEM : Fail-safeINFOID:0000000006300453
IPDM E/R
When CAN communication with ECM and BCM is impossible, IPDM E/R performs fail-safe control. After CAN
communication recovers normally, it also returns to normal control.
If No CAN Communication Is Available With BCM
JPLIA0410GB
Revision: 2010 May2011 QX56

WW-12
< SYSTEM DESCRIPTION >
SYSTEM
- Rear washer switch ON (0.4 second or more)
 The washer pump is grounded through the combination switch with the rear washer switch ON.
REAR WIPER OPERATION LINKED WITH REVERSE (WITH RAIN SENSOR)
 BCM controls rear wiper to operate once according to the conditions of rear wiper operation linked with
reverse.
Condition of rear wiper operation linked with reverse - Ignition switch ON
- Front wiper switch: LO, HI or AUTO, and the front wiper auto operation ON judgement.
- Rear wiper switch OFF
- Selector lever “R”
 TCM transmits the shift position signal to BCM thr ough the CAN communication line when the selector lever
is shifted to "R".
 BCM supplies power to the rear wiper motor when receiving the shift position signal.
REAR WIPER OPERATION LINKED WITH REVERSE (WITHOUT RAIN SENSOR)
 BCM controls rear wiper to operate once according to the conditions of rear wiper operation linked with
reverse.
Condition of rear wiper operation linked with reverse
- Ignition switch ON
- Front wiper switch: LO, HI or INT.
- Rear wiper switch OFF
- Selector lever “R”
 TCM transmits the shift position signal to BCM thr ough the CAN communication line when the selector lever
is shifted to "R".
 BCM supplies power to the rear wiper motor when receiving the shift position signal.
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 once approximately three seconds later after the washer
interlocking operation of the rear wiper.
REAR WIPER AND WASHER SYSTEM : Fail SafeINFOID:0000000006300459
REAR WIPER MOTOR PROTECTION
BCM detects the rear wiper stopping position ac cording to the rear wiper auto stop signal.
When the rear wiper auto stop signal does not change more than 5 seconds while driving the rear wiper, BCM
stops power supply to protect the rear wiper motor.
Condition of cancellation
1. Pass more than 1 minute after the rear wiper stop.
2. Operate the rear wiper switch.
HEADLAMP WASHER SYSTEM
Revision: 2010 May2011 QX56

DIAGNOSIS SYSTEM (IPDM E/R)WW-19
< SYSTEM DESCRIPTION >
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Concept of auto active test
 IPDM E/R starts the auto active test with the door
switch signals transmitted by BCM via CAN communica-
tion. Therefore, the CAN communication line between IPDM E/R and BCM is considered normal if the auto
active test starts successfully.
 The auto active test facilitates troubleshooting if any systems controlled by IPDM E/R cannot be operated.
Diagnosis chart in auto active test
5 Headlamp LO for 10 seconds →HI ON ⇔ OFF 5 times
6 A/C compressor (magnet clutch) ON ⇔ OFF 5 times
Operation
sequence Inspection location Operation
JMMIA0492GB
Symptom Inspection contents Possible cause
Rear window defogger does not operate Perform auto active test.
Does the rear window defog-
ger operate?YES BCM signal input circuit
NO  Rear window defogger
 Rear window defogger
ground circuit
 Harness or connector be- tween IPDM E/R and rear
window defogger
 IPDM E/R
Any of the following components do not operate
Parking lamp
 License plate lamp
Tail lamp
 Side marker lamp
 Front fog lamp
 Headlamp (HI, LO)
 Front wiper (HI, LO) Perform auto active test.
Does the applicable system
operate?YES BCM signal input circuit
NO  Lamp or motor
 Lamp or motor ground cir-
cuit
 Harness or connector be- tween IPDM E/R and appli-
cable system
 IPDM E/R
A/C compressor does not operate Perform auto active test.
Does the magnet clutch oper-
ate?YES
 A/C auto amp. signal input
circuit
 CAN communication signal
between A/C auto amp. and
ECM
 CAN communication signal
between ECM and IPDM E/
R
NO  Magnet clutch
 Harness or connector be-
tween IPDM E/R and mag-
net clutch
 IPDM E/R
Revision: 2010 May2011 QX56

WW-36
< DTC/CIRCUIT DIAGNOSIS >
FRONT WIPER MOTOR LO CIRCUIT
FRONT WIPER MOTOR LO CIRCUIT
Component Function CheckINFOID:0000000006300468
1.CHECK FRONT WIPER LO OPERATION
CONSULT-III ACTIVE TEST
1. Select “FRONT WIPER” of IPDM E/R active test item.
2. With operating the test item, check front wiper operation.
Is front wiper (LO) operation normally?
YES >> Front wiper motor LO circuit is normal.
NO >> Refer to WW-36, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000006300469
1.CHECK FRONT WIPER MOTOR (LO) OUTPUT VOLTAGE
CONSULT-III ACTIVE TEST
1. Turn ignition switch OFF.
2. Disconnect front wiper motor connector.
3. Turn ignition switch ON.
4. Select “FRONT WIPER” of IPDM E/R active test item.
5. With operating the test item, check voltage between front wiper motor harness connector and ground.
Is the inspection result normal?
YES >> Replace front wiper motor.
NO >> GO TO 2.
2.CHECK FRONT WIPER MOTOR (LO) CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R connector.
3. Check continuity between IPDM E/R harness connector and front wiper motor harness connector.
4. Check continuity between IP DM E/R harness connector and ground.
Is the inspection result normal?
YES >> Replace IPDM E/R.
NO >> Repair or replace harness. Lo : Front wiper (LO) operation
Off : Stop the front wiper.
(+)
(− ) Condition Voltage (Approx.)
Front wiper motor
Connector Terminal
E42 1 Ground FRONT WIPER Lo Battery voltage
Off 0 V
IPDM E/R Front wiper motor Continuity
Connector Terminal Connector Terminal
E14 45 E42 1 Existed
IPDM E/R GroundContinuity
Connector Terminal
E14 45 Not existed
Revision: 2010 May2011 QX56

FRONT WIPER MOTOR HI CIRCUITWW-37
< DTC/CIRCUIT DIAGNOSIS >
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FRONT WIPER MOTOR HI CIRCUIT
Component Function CheckINFOID:0000000006300470
1.CHECK FRONT WIPER HI OPERATION
CONSULT-III ACTIVE TEST
1. Select “FRONT WIPER” of IPDM E/R active test item.
2. With operating the test item, check front wiper operation.
Is front wiper (HI) operation normally?
YES >> Front wiper motor HI circuit is normal.
NO >> Refer to WW-37, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000006300471
1.CHECK FRONT WIPER MOTOR (HI) OUTPUT VOLTAGE
CONSULT-III ACTIVE TEST
1. Turn ignition switch OFF.
2. Disconnect front wiper motor connector.
3. Turn ignition switch ON.
4. Select “FRONT WIPER” of IPDM E/R active test item.
5. With operating the test item, check voltage between front wiper motor harness connector and ground.
Is the inspection result normal?
YES >> Replace front wiper motor.
NO >> GO TO 2.
2.CHECK FRONT WIPER MOTOR (HI) CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R connector.
3. Check continuity between IPDM E/R harness connector and front wiper motor harness connector.
4. Check continuity between IPDM E/R harness connector and ground.
Is the inspection result normal?
YES >> Replace IPDM E/R.
NO >> Repair or replace harness. Hi : Front wiper (HI) operation
Off : Stop the front wiper.
(+)
(− ) Condition Voltage (Approx.)
Front wiper motor
Connector Terminal
E42 4 Ground FRONT WIPER Hi Battery voltage
Off 0 V
IPDM E/R Front wiper motor Continuity
Connector Terminal Connector Terminal
E1439E42 4Existed
IPDM E/R GroundContinuity
Connector Terminal
E14 39 Not existed
Revision: 2010 May2011 QX56

WW-38
< DTC/CIRCUIT DIAGNOSIS >
FRONT WIPER AUTO STOP SIGNAL CIRCUIT
FRONT WIPER AUTO STOP SIGNAL CIRCUIT
Component Function CheckINFOID:0000000006300472
1.CHECK FRONT WIPER (AUTO STOP) SIGNAL
CONSULT-III DATA MONITOR
1. Select “WIP AUTO STOP” of IPDM E/R data monitor item.
2. Operate the front wiper.
3. With the front wiper operation, check the monitor status.
Is the status of item normal?
YES >> Auto stop signal circuit is normal.
NO >> Refer to WW-38, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000006300473
1.CHECK IPDM E/R OUTPUT VOLTAGE
1. Turn ignition switch OFF.
2. Disconnect front wiper motor connector.
3. Turn ignition switch ON.
4. Check voltage between front wiper motor harness connector and ground.
Is the inspection result normal?
YES >> Replace front wiper motor.
NO >> GO TO 2.
2.CHECK FRONT WIPER MOTO R (AUTO STOP) CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R connector.
3. Check continuity between IPDM E/R harness connector and front wiper motor harness connector.
4. Check continuity between IP DM E/R harness connector and ground.
Is the inspection result normal?
YES >> Replace IPDM E/R.
NO >> Repair or replace harness.
Monitor item Condition Monitor status
WIP AUTO STOP Front wiper motor Stop position STOP P
Except stop position ACT P
(+)
(− ) Voltage (Approx.)
Front wiper motor
Connector Terminal E42 5 Ground Battery voltage
IPDM E/R Front wiper motor Continuity
Connector Terminal Connector Terminal
E13 25 E42 5 Existed
IPDM E/R GroundContinuity
Connector Terminal
E13 25 Not existed
Revision: 2010 May2011 QX56

FRONT WIPER MOTOR GROUND CIRCUITWW-39
< DTC/CIRCUIT DIAGNOSIS >
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FRONT WIPER MOTOR GROUND CIRCUIT
Diagnosis ProcedureINFOID:0000000006300474
1.CHECK FRONT WIPER MOTOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect front wiper motor connector.
3. Check continuity between front wiper motor harness connector and ground.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Repair or replace harness.
Front wiper motor
GroundContinuity
Connector Terminal
E42 2 Existed
Revision: 2010 May2011 QX56

WW-40
< DTC/CIRCUIT DIAGNOSIS >
LIGHT & RAIN SENSOR
LIGHT & RAIN SENSOR
Component Function CheckINFOID:0000000006300475
1.CHECK FRONT WIPER AUTO OPERATION
1. Clean light & rain sensor detection area of windshield fully.
2. When the front wiper switch is turned to AUTO pos ition, front wiper operates once regardless of a rainy
condition.
Is front wiper (AUTO) operation normally?
YES >> Light & rain sensor circuit is normal.
NO >> Refer to WW-40, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000006300476
1.CHECK LIGHT & RAIN SENSOR FUSE
1. Turn the ignition switch OFF.
2. Check that the light & rain sensor 10A fuse (#6) is not fusing.
Is the fuse fusing?
YES >> Replace the fuse after repairing the applicable circuit.
NO >> GO TO 2.
2.CHECK LIGHT & RAIN SENSOR POWER SUPPLY
1. Disconnect light & rain sensor connector.
2. Check voltage between light & rain sensor harness connector and ground.
Is the measurement value normal?
YES >> GO TO 3.
NO >> Repair or replace harness.
3.CHECK LIGHT & RAIN SENSOR GROUND CIRCUIT
Check continuity between light & ra in sensor harness connector and ground.
Does continuity exist?
YES >> GO TO 4.
NO >> Repair or replace harness.
4.CHECK LIGHT & RAIN SENSOR SIGNAL
1. Connect light & rain sensor connector.
2. Turn ignition switch ON.
3. Check signal between BCM harness connector and ground with oscilloscope.
(+)
(− ) Voltage (Approx.)
Light & rain sensor
Connector Terminal R9 1 Ground Battery voltage
Light & rain sensor GroundContinuity
Connector Terminal
R9 3 Existed
Revision: 2010 May2011 QX56

LIGHT & RAIN SENSORWW-41
< DTC/CIRCUIT DIAGNOSIS >
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Is the measurement value normal?
YES >> Replace light & rain sensor.
NO >> GO TO 5.
5.CHECK LIGHT & RAIN SENSOR SIGNAL CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect BCM connector and light & rain sensor connector.
3. Check continuity between BCM harness connecto r and light & rain sensor harness connector.
Does continuity exist?
YES >> GO TO 6.
NO >> Repair or replace harness.
6.CHECK LIGHT & RAIN SENSOR SIGNAL CIRCUIT FOR SHORT
Check continuity between BCM harness connector and ground.
Does continuity exist?
YES >> Repair or replace harness.
NO >> Replace BCM. Refer to BCS-81, "
Removal and Installation".
(+)
(− ) Condition Signal
(Reference value)
BCM
Connector Terminal
M68 11 Ground Ignition switch ON Approx. 8.7V
JPMIA0156GB
BCM Light & rain sensorContinuity
Connector Terminal Connector Terminal
M68 11 R9 2 Existed
BCM GroundContinuity
Connector Terminal
M68 11 Not existed
Revision: 2010 May2011 QX56

REAR WIPER MOTOR CIRCUITWW-43
< DTC/CIRCUIT DIAGNOSIS >
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REAR WIPER MOTOR CIRCUIT
Component Function CheckINFOID:0000000006300478
1.CHECK REAR WIPER ON OPERATION
CONSULT-III ACTIVE TEST
1. Select “RR WIPER” of BCM active test item.
2. With operating the test item, check rear wiper operation.
Is rear wiper operation normally?
YES >> Rear wiper motor circuit is normal.
NO >> Refer to WW-43, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000006300479
1.CHECK REAR WIPER MOTOR OUTPUT VOLTAGE
CONSULT-III ACTIVE TEST
1. Turn ignition switch OFF.
2. Disconnect rear wiper motor connector.
3. Turn ignition switch ON.
4. Select “RR WIPER” of BCM active test item.
5. With operating the test item, check voltage between rear wiper motor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK REAR WIPER MOTOR CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM connector.
3. Check continuity between BCM harness connector and rear wiper motor harness connector.
4. Check continuity between BCM harness connector and ground.
Is the inspection result normal?
YES >> Replace BCM. Refer to BCS-81, "Removal and Installation".
NO >> Repair or replace harness.
3.CHECK REAR WIPER MOTOR GROUND OPEN CIRCUIT
Check continuity between rear wi per motor harness connector and ground.
On : Rear wiper ON operation
Off : Stop the rear wiper.
(+)
(− ) Condition Voltage (Approx.)
Rear wiper motor
Connector Terminal
D160 2 Ground REAR WIPER On Battery voltage
Off 0 V
BCM Rear wiper motor Continuity
Connector Terminal Connector Terminal
M70 54 D160 2 Existed
BCM GroundContinuity
Connector Terminal
M70 54 Not existed
Revision: 2010 May2011 QX56