exl INFINITI QX56 2010 Factory Service Manual

EXL-132
< ECU DIAGNOSIS >
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
ABMIA1042GB
Revision: April 20092010 QX56

IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
EXL-133
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Fail SafeINFOID:0000000005369901
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
ABMIA1043GB
Revision: April 20092010 QX56

EXL-134
< 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 LH/RH relays 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: April 20092010 QX56

IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
EXL-135
< ECU DIAGNOSIS >
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DTC IndexINFOID:0000000005369902
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: April 20092010 QX56

EXL-136
< SYMPTOM DIAGNOSIS >
EXTERIOR LIGHTING SYSTEM SYMPTOMS
SYMPTOM DIAGNOSIS
EXTERIOR LIGHTING SYSTEM SYMPTOMS
Symptom TableINFOID:0000000005146686
CAUTION:
Perform the self-diagnosis with CONSULT-III before the symptom diagnosis. Perform the trouble diag-
nosis if any DTC is detected.
Symptom Possible causeInspection item
Headlamp does not
switch to the high beam. One side•Fuse
• Harness between IPDM E/R
and the front combination lamp
• Front combination lamp
(High beam relay)
• IPDM E/R Headlamp (HI) circuit
Refer to EXL-30, "
Description".
Both sides Symptom diagnosis
"BOTH SIDE HEADLAMPS DO NOT SWITCH TO HIGH BEAM"
Refer to
EXL-139
.
High beam indicator lamp is not turned ON.
(Headlamp switches to the high beam.) • Combination meter
•BCM• Combination meter.
Data monitor "HI-BEAM IND".
• BCM (HEAD LAMP) Active test "HEADLAMP".
Headlamp does not
switch to the low beam. One side
Front combination lamp (Low
beam relay)
—
Both sides • Combination switch (lighting
and turn signal switch)
• Harness between the combina-
tion switch and BCM
•BCM Combination switch
Refer to BCS-38
.
High beam request signal
•BCM
• IPDM E/R IPDM E/R
Data monitor "HL HI REQ".
IPDM E/R —
Headlamp does not turn
ON. One side•Fuse
•Bulb
• Harness between IPDM E/R
and the front combination lamp
• Front combination lamp
• IPDM E/R Headlamp (L
O) circuit
Refer to EXL-33
.
Both sides Symptom diagnosis
"BOTH SIDE HEADLAMPS (LO) ARE NOT TURNED ON"
Refer to
EXL-140, "
Description".
Headlamp does not turn
OFF. When the ignition
switch is turned ON•BCM
• Combination switch (lighting
and turn signal switch) Combination switch (lighting and
turn signal switch)
Refer to BCS-38
.
Headlamp is not turned ON/OFF with the lighting
switch AUTO. • Combination switch (lighting
and turn signal switch)
• Harness between the combina-
tion switch and BCM
•BCM Combination switch (lighting and
turn signal switch)
Refer to BCS-38
.
• Optical sensor
• Harness between the optical sensor and BCM
•BCM Optical sensor
Refer to EXL-47
.
Revision: April 20092010 QX56

EXTERIOR LIGHTING SYSTEM SYMPTOMSEXL-137
< SYMPTOM DIAGNOSIS >
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Daytime light system does not activate. • Either high beam bulb
• Parking brake switch
• Combination switch (lighting
and turn signal switch)
•BCM
• IPDM E/R
• Daytime light relay
• Harness between IPDM E/R
and daytime light relay. Daytime light system description.
Refer to
EXL-9, "System Descrip-
tion".
Front fog lamp is not
turned ON. One side
• Front fog lamp bulb
• Harness between IPDM E/R
and the front combination lamp
• Front combination lamp
• IPDM E/R Front fog lamp circuit
Refer to
EXL-36
.
Both sides Symptom diagnosis
"BOTH SIDE FRONT FOG LAMPS ARE NOT TURNED ON"
Refer to EXL-142
.
Parking lamp is not turned
ON. One side•Fuse
• Parking lamp bulb
• Harness between IPDM E/R
and the front/rear combination
lamp
• Front/rear combination lamp
• IPDM E/R Parking lamp circuit
Refer to
EXL-38
.
Both sides Symptom diagnosis
"PARKING, LICENSE PLATE AND TAIL LAMPS ARE NOT TURNED
ON"
Refer to EXL-141
.
Turn signal lamp does not
blink. Indicator lamp is nor-
mal.
(The applicable side
performs the high flash-
er activation).• Harness between BCM and
each turn signal lamp
• Turn signal lamp bulb
• Door mirror Turn signal lamp circuit
Refer to
EXL-44
.
Turn signal indicator lamp
does not blink. One side
Combination meter —
Both sides
(Always) • Turn signal indicator lamp sig-
nal
• Combination meter
•BCM • Combination meter.
Data monitor "TURN IND".
• BCM (FLASHER) Active test "FLASHER".
Both sides
(Does blink when acti-
vating the hazard warn-
ing lamp with the
ignition switch OFF) • The combination meter power
supply and the ground circuit
• Combination meter Combination meter
Power supply and the ground circuit
Refer to
MWI-28
.
Symptom
Possible causeInspection item
Revision: April 20092010 QX56

EXL-138
< SYMPTOM DIAGNOSIS >
NORMAL OPERATING CONDITION
NORMAL OPERATING CONDITION
DescriptionINFOID:0000000005146687
XENON HEADLAMPS
The brightness and color of the light may vary slightly immediately after turning the headlamp ON. This condi-
tionwill remain until the xenon bulb becomes stable. This is normal.
• Illumination time lag may occur between right and left. This is normal.
AUTO LIGHT SYSTEM
The auto light system may not turn the headlamp ON/OF F immediately after passing a dark area or a bright
area (short tunnel, sky bridge, shadowed area etc.). This is normal.
Revision: April 20092010 QX56

BOTH SIDE HEADLAMPS DO NOT SWITCH TO HIGH BEAM
EXL-139
< SYMPTOM DIAGNOSIS >
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BOTH SIDE HEADLAMPS DO NOT SWITCH TO HIGH BEAM
DescriptionINFOID:0000000005146688
The headlamps (both sides) do not switch to high beam when the combination switch (lighting and turn signal
switch) is in the HI or PASS setting.
Diagnosis ProcedureINFOID:0000000005146689
1.COMBINATION SWITCH (LIGHTING AND TURN SIGNAL SWITCH) INSPECTION
Check the combination switch (lighting and turn signal switch). Refer to BCS-38, "
Diagnosis Procedure".
Is the combination switch (lighting and turn signal switch) normal?
YES >> GO TO 2.
NO >> Repair or replace the malfunctioning part.
2.CHECK HEADLAMP (HI) REQUEST SIGNAL INPUT
CONSULT-III DATA MONITOR
1. Select "HL HI REQ" of IPDM E/R DATA MONITOR item.
2. With operating the combination switch (lighting and turn signal switch), check the monitor status.
Is the item status normal?
YES >> GO TO 3.
NO >> Replace BCM. Refer to BCS-59, "
Removal and Installation" .
3.HEADLAMP (HI) CIRCUIT INSPECTION
Check the headlamp (HI) circuit. Refer to EXL-30, "
Description".
Is the headlamp (HI) circuit normal?
YES >> Replace IPDM E/R. Refer to PCS-35, "Removal and Installation of IPDM E/R" .
NO >> Repair or replace the malfunctioning part.
Monitor item ConditionMonitor status
HL HI REQ Combination switch (lighting and
turn signal switch)
(2ND) HI or PASS
ON
Except for HI or
PASS OFF
Revision: April 20092010 QX56

EXL-140
< SYMPTOM DIAGNOSIS >
BOTH SIDE HEADLAMPS (LO) ARE NOT TURNED ON
BOTH SIDE HEADLAMPS (LO) ARE NOT TURNED ON
DescriptionINFOID:0000000005146690
The headlamps (both sides) do not turn ON in any combination switch (lighting and turn signal switch) setting.
Diagnosis ProcedureINFOID:0000000005146691
1.COMBINATION SWITCH (LIGHTING AND TURN SIGNAL SWITCH) INSPECTION
Check the combination switch (lighting and turn signal switch). Refer to BCS-38, "
Diagnosis Procedure".
Is the combination switch (lighting and turn signal switch) normal?
YES >> GO TO 2.
NO >> Repair or replace the malfunctioning part.
2.CHECK HEADLAMP (LO) REQUEST SIGNAL INPUT
CONSULT-III DATA MONITOR
1. Select "HL LO REQ" of IPDM E/R DATA MONITOR item.
2. With operating the combination switch (lighting and turn signal switch), check the monitor status.
Is the item status normal?
YES >> GO TO 3.
NO >> Replace BCM. Refer to BCS-59, "
Removal and Installation" .
3.HEADLAMP (LO) CIRCUIT INSPECTION
Check the headlamp (LO) circuit. Refer to EXL-33, "
Description".
Is the headlamp (LO) circuit normal?
YES >> Replace IPDM E/R. Refer to PCS-35, "Removal and Installation of IPDM E/R" .
NO >> Repair or replace the malfunctioning part.
Monitor item ConditionMonitor status
HL LO REQ Combination switch
(lighting and turn signal
switch) 2ND
ON
OFF OFF
Revision: April 20092010 QX56

PARKING, LICENSE PLATE AND TAIL LAMPS ARE NOT TURNED ON
EXL-141
< SYMPTOM DIAGNOSIS >
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PARKING, LICENSE PLATE AND TA IL LAMPS ARE NOT TURNED ON
DescriptionINFOID:0000000005146692
The parking, license plate and tail lamps do not turn ON in with any combination switch (lighting and turn sig-
nal switch) setting.
Diagnosis ProcedureINFOID:0000000005146693
1.COMBINATION SWITCH (LIGHTING AND TURN SIGNAL SWITCH) INSPECTION
Check the combination switch (lighting and turn signal switch). Refer to BCS-38, "
Diagnosis Procedure".
Is the combination switch (lighting and turn signal switch) normal?
YES >> GO TO 2.
NO >> Repair or replace the malfunctioning part.
2.CHECK TAIL LAMP RELAY REQUEST SIGNAL INPUT
CONSULT-III DATA MONITOR
1. Select "TAIL & CLR REQ" of IPDM E/R DATA MONITOR item.
2. With operating the combination switch (lighting and turn signal switch), check the monitor status.
Is the item status normal?
YES >> GO TO 3.
NO >> Replace BCM. Refer to BCS-59, "
Removal and Installation".
3.PARK LAMP CIRCUIT INSPECTION
Check the parking lamp circuit. Refer to EXL-38, "
Description".
Is the tail lamp circuit normal?
YES >> Replace IPDM E/R. Refer to PCS-35, "Removal and Installation of IPDM E/R".
NO >> Repair or replace the malfunctioning part.
Monitor item ConditionMonitor status
TAIL & CLR
REQ combination switch (lighting
and turn signal switch) 1ST
ON
OFF OFF
Revision: April 20092010 QX56