INFINITI QX56 2008 Factory Service Manual

WW-64
< ECU DIAGNOSIS >
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
AAMIA0085GB
Revision: March 2010 2008 QX56

IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
WW-65
< ECU DIAGNOSIS >
C
D E
F
G H
I
J
K
M A
B
WW
N
O P
Fail SafeINFOID:0000000004874903
CAN COMMUNICATION CONTROL
When CAN communication with ECM and BCM is impossible, IPDM E/R performs fail-s afe control. After CAN
communication recovers normally, it also returns to normal control.
If No CAN Communication Is Available With ECM
ABMIA2251GB
Revision: March 2010 2008 QX56

WW-66
< ECU DIAGNOSIS >
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
If No CAN Communication Is Available With BCM
IGNITION RELAY MALFUNCTION DETECTION FUNCTION
• IPDM E/R monitors the voltage at the contact circuit and excitation coil circuit of the ignition relay inside it.
• IPDM E/R judges the ignition relay error if the voltage differs between the contact circuit and the excitation
coil circuit.
• If the ignition relay cannot turn OFF due to contact seizure, it activates the tail lamp relay for 10 minutes to alert the user to the ignition relay malfunction when the ignition switch is turned OFF.
NOTE:
The tail lamp turns OFF when the ignition switch is turned ON.
FRONT WIPER CONTROL
IPDM E/R detects front wiper stop posit ion by a front wiper auto stop signal.
When a front wiper auto stop signal is in the conditions listed below, IPDM E/R stops power supply to wiper
after repeating a front wiper 10 second activation and 20 second stop five times.
NOTE:
This operation status can be confirmed on the IPDM E/R “DATA MONITOR” that displays “Block” for the item
“WIP PROT” while the wiper is stopped.
STARTER MOTOR PROTECTION FUNCTION
IPDM E/R turns OFF the starter control relay to protect the starter motor when the starter control relay remains
active for 90 seconds.
Control part Fail-safe in operation
Cooling fan • Turns ON the cooling fan relay when the ignition switch is turned ON
• Turns OFF the cooling fan relay when the ignition switch is turned OFF
Control part
Fail-safe in operation
Headlamp • Turns ON the headlamp low relay when the ignition switch is turned ON
• Turns OFF the headlamp low relay when the ignition switch is turned OFF
• Headlamp high relay OFF
•Parking lamps
• License plate lamps
• Tail lamps • Turns ON the tail lamp relay when the ignition switch is turned ON
• Turns OFF the tail lamp relay when the ignition switch is turned OFF
Front wiper • The status just before activation of fail-safe control is maintained until the ignition
switch is turned OFF while the front wiper is operating at LO or HI speed.
• The wiper is operated at LO speed until the ignition switch is turned OFF if the fail- safe control is activated while the front wipe r is set in the INT mode and the front wiper
motor is operating.
Rear window defogger Rear window defogger relay OFF
A/C compressor A/C relay OFF
Front fog lamps Front fog lamp relay OFF
Ignition switch Ignition relayTail lamp relay
ON ON —
OFF OFF —
Ignition switchFront wiper switch Auto stop signal
ON OFF
Front wiper stop position signal cannot be
input 10 seconds.
ON The signal does not change for 10 seconds.
Revision: March 2010 2008 QX56

IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
WW-67
< ECU DIAGNOSIS >
C
D E
F
G H
I
J
K
M A
B
WW
N
O P
DTC IndexINFOID:0000000004874905
NOTE:
The details of TIME display are as follows.
• CRNT: The malfunctions that are detected now
• 1 - 39: The number is indicated when it is normal at present and a malfunction was detected in the past. It
increases like 0 → 1 → 2 ··· 38 → 39 after returning to the normal condition whenever IGN OFF → ON. It is
fixed to 39 until the self-diagnosis results are erased if it is over 39. It returns to 0 when a malfunction is
detected again in the process.
CONSULT-III display Fail-safe
TIMENOTERefer to
No DTC is detected.
further testing
may be required. ————
U1000: CAN COMM CIRCUIT ×CRNT 1 – 39 PCS-17
Revision: March 2010 2008 QX56

WW-68
< SYMPTOM DIAGNOSIS >
WIPER AND WASHER SYSTEM SYMPTOMS
SYMPTOM DIAGNOSIS
WIPER AND WASHER SYSTEM SYMPTOMS
Symptom TableINFOID:0000000001735597
CAUTION:
Perform the self-diagnosis with CONSULT-III before performing the diagnosis by symptom. Perform
the diagnosis by DTC if DTC is detected.
Symptom Probable malfunction location Inspection item
Front wiper does not
operate. HI only
• Combination switch
• Harness between combination switch and BCM
•BCM
Combination switch
Refer to BCS-52, "
Symptom
Ta b l e".
• IPDM E/R
• Harness between IPDM E/R and front wiper motor
• Front wiper motor Front wiper moto
r (HI) circuit
Refer to WW-21, "
Compo-
nent Function Check".
Front wiper request signal
•BCM
• IPDM E/R IPDM E/R DATA MONITOR
"FR WIP REQ"
LO and INT • Combination switch
• Harness between combination switch and BCM
•BCM
Combination switch
Refer to BCS-52, "
Symptom
Ta b l e".
• IPDM E/R
• Harness between IPDM E/R and front wiper motor
• Front wiper motor Front wiper motor (LO) circuit
Refer to WW-19, "
Compo-
nent Function Check".
Front wiper request signal
•BCM
• IPDM E/R IPDM E/R DATA MONITOR
"FR WIP REQ"
INT only • Combination switch
• Harness between combination switch and BCM
•BCM
Combination switch
Refer to BCS-52, "
Symptom
Ta b l e".
Front wiper request signal
•BCM
• IPDM E/R IPDM E/R DATA MONITOR
"FR WIP REQ"
HI, LO, and INT SYMPTOM DIAGNOSIS
“FRONT WIPER DOES NOT OPERATE”
Refer to
WW-72, "
Diagnosis Procedure".
Revision: March 2010 2008 QX56

WIPER AND WASHER SYSTEM SYMPTOMSWW-69
< SYMPTOM DIAGNOSIS >
C
DE
F
G H
I
J
K
M A
B
WW
N
O P
Front wiper does not
stop. HI only
• Combination switch
•BCM
Combination switch
Refer to BCS-52, "
Symptom
Ta b l e".
Front wiper request signal
•BCM
• IPDM E/R IPDM E/R DATA MONITOR
"FR WIP REQ"
IPDM E/R —
LO only • Combination switch
•BCM
Combination switch
Refer to BCS-52, "
Symptom
Ta b l e".
Front wiper request signal
•BCM
• IPDM E/R IPDM E/R DATA MONITOR
"FR WIP REQ"
IPDM E/R —
INT only • Combination switch
•BCM
Combination switch
Refer to BCS-52, "
Symptom
Ta b l e".
Front wiper request signal
•BCM
• IPDM E/R IPDM E/R DATA MONITOR
"FR WIP REQ"
Front wiper does not
operate normally. Intermittent adjustment
cannot be performed.
• Combination switch
• Harness between combination switch and BCM
•BCM
Combination switch
Refer to BCS-52, "
Symptom
Ta b l e".
BCM —
Intermittent control
linked with vehicle
speed cannot be per-
formed. Check the vehicle speed detection wiper setting.
Refer to WW-11, "
WIPER : CONSULT-III Function (BCM - WIPER)".
Wiper is not linked to
the washer operation. • Combination switch
• Harness between combination switch and BCM
•BCM
Combination switch
Refer to BCS-52, "
Symptom
Ta b l e".
BCM —
Does not return to stop
position (Repeatedly
operates for 10 sec-
onds and then stops
for 20 seconds. After
that, it stops the opera-
tion). • IPDM E/R
• Harness between IPDM E/R and front wiper
motor
• Front wiper motor Front wiper auto stop signal
circuit
Refer to WW-23, "
Compo-
nent Function Check".
Rear wiper does not
operate. ON only
• Combination switch
• Harness between combination switch and BCM
•BCM Combination switch
Refer to BCS-52, "
Symptom
Ta b l e".
INT only • Combination switch
• Harness between combination switch and BCM
•BCM Combination switch
Refer to BCS-52, "
Symptom
Ta b l e".
ON and INT • Combination switch
• Harness between combination switch and BCM
•BCM
Combination switch
Refer to BCS-52, "
Symptom
Ta b l e".
•BCM
• Harness between rear wiper motor and BCM
• Harness between rear wiper motor and ground
• Rear wiper motor
• Glass hatch ajar switch Combination switch
Refer to WW-28, "
Compo-
nent Function Check".
Symptom
Probable malfunction location Inspection item
Revision: March 2010 2008 QX56

WW-70
< SYMPTOM DIAGNOSIS >
WIPER AND WASHER SYSTEM SYMPTOMS
Rear wiper does not
stop.ON only
• Combination switch
•BCM Rear wiper motor circuit
Refer to WW-28, "
Compo-
nent Function Check".
INT only • Combination switch
•BCM Combination switch
Refer to BCS-52, "
Symptom
Ta b l e".
Rear wiper does not
operate normally. Wiper is not linked to
the washer operation.
• Combination switch
• Harness between rear wiper motor and BCM
•BCM
Combination switch
Refer to BCS-52, "
Symptom
Ta b l e".
BCM —
Rear wiper does not
return to the Stop posi-
tion (Stops after a five-
second operation). •BCM
• Harness between rear wiper motor and BCM
• Rear wiper motor Rear wiper auto stop signal
circuit
Refer to WW-30, "
Compo-
nent Function Check".
Rear wiper stops after
operating for five sec-
onds when ignition
switch is turned ON.
Symptom Probable malfunction location Inspection item
Revision: March 2010
2008 QX56

NORMAL OPERATING CONDITIONWW-71
< SYMPTOM DIAGNOSIS >
C
DE
F
G H
I
J
K
M A
B
WW
N
O P
NORMAL OPERATING CONDITION
DescriptionINFOID:0000000001735598
FRONT WIPER MOTOR PROTECTION FUNCTION
• IPDM E/R may stop the front wiper to protect the front wiper motor if any obstruction (operation resistance) such as a large amount of snow is detected during the front wiper operation.
• At that time turn OFF the front wiper and remove t he foreign object. Then wait for approximately 20 seconds
or more and reactivate the front wiper. The wiper will operate normally.
REAR WIPER MOTOR PROTECTION FUNCTION
• BCM may stop rear wiper to protect the rear wiper motor when the rear wiper is stopped for 5 seconds or
more due to a snowfall.
• Rear wiper operates normally one minute after the obstacles are removed with rear wiper OFF.
Revision: March 2010 2008 QX56

WW-72
< SYMPTOM DIAGNOSIS >
FRONT WIPER DOES NOT OPERATE
FRONT WIPER DOES NOT OPERATE
DescriptionINFOID:0000000001735599
The front wiper does not operate under any operation conditions.
Diagnosis ProcedureINFOID:0000000001735600
1. CHECK WIPER RELAY OPERATION
IPDM E/R AUTO ACTIVE TEST
1. Start IPDM E/R auto active test. Refer to PCS-8, "
System Description".
2. Check that the front wiper operates at the LO/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 operation normal?
YES >> GO TO 5
NO >> GO TO 2
2. 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 >> Replace the fuse after repairing the applicable circuit.
NO >> GO TO 3
3. CHECK FRONT WIPER MOTOR GROUND OPEN CIRCUIT
1. Disconnect front wiper motor.
2. Check continuity between front wiper motor harness connector and ground.
Does continuity exist?
YES >> GO TO 4
NO >> Repair or replace harness.
4. CHECK FRONT WIPER MOTOR OUTPUT VOLTAGE
CONSULT-III ACTIVE TEST LO : Front wiper LO operation
HI : Front wiper HI operation
OFF : Stop the front wiper.
Unit Location Fuse No. Capacity
Front wiper motor IPDM E/R39 30 A
Front wiper motor
GroundContinuity
Connector Terminal
E23 1 Yes
WKIA2828E
Revision: March 2010 2008 QX56

FRONT WIPER DOES NOT OPERATEWW-73
< SYMPTOM DIAGNOSIS >
C
DE
F
G H
I
J
K
M A
B
WW
N
O P
1. Turn the ignition switch ON.
2. Select "FRONT WIPER" of IPDM E/R active test item.
3. With operating the test item, check voltage between IPDM E/R harness connector and ground.
Is the measurement value normal?
YES >> Replace front wiper motor. Refer to WW-77, "Wiper Motor and Linkage".
NO >> Replace IPDM E/R. Refer to PCS-34, "
Removal and Installation of IPDM E/R".
5. CHECK FRONT WIPER REQUEST SIGNAL INPUT
CONSULT-III DATA MONITOR
1. Select "FR WIP REQ" of IPDM E/R data monitor item.
2. Switch the front wiper switch to HI and LO.
3. With operating the front wiper switch , check the status of "FR WIP REQ".
Is the status of item normal?
YES >> Replace IPDM E/R. Refer to PCS-34, "Removal and Installation of IPDM E/R".
NO >> GO TO 6
6. CHECK COMBINATION SWITCH
1. Perform the inspection of the combination switch. Refer to BCS-52, "
Symptom Table".
Is combination switch normal?
YES >> Replace BCM. Refer to BCS-55, "Removal and Installation".
NO >> Repair or replace the applicable parts.
Te r m i n a l s Te s t i t e m
Voltage
(Approx.)
(+)
(− )
IPDM E/R
GroundFRONT WIP-
ER
Connector Terminal
E121 32
LO
Battery
voltage
OFF 0 V
35 HI
Battery
voltage
OFF 0 V
WKIA1427E
Monitor item ConditionMonitor
status
FR WIP REQ Front wiper switch HI
HI ON
STOP OFF
Front wiper switch LO 1LOW ON
STOP OFF
Revision: March 2010 2008 QX56