ignition INFINITI QX56 2007 Factory Service Manual

TROUBLE DIAGNOSIS FOR SYMPTOMS
WT-23
< SERVICE INFORMATION >
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TROUBLE DIAGNOSIS FOR SYMPTOMS
Low Tire Pressure Warning Lamp Does Not Come On When Ignition Switch Is Turned
On
INFOID:0000000003532708
DIAGNOSTIC PROCEDURE
1.SELF-DIAGNOSTIC RESULT CHECK
Using CONSULT-II, check display contents in self-diagnostic results.
Is "CAN COMM CIRCUIT" displayed in the self-diagnosis display items?
YES >> Malfunction in CAN communication system. GO TO LAN-40.
NO >> GO TO 2.
2.CHECK COMBINATION METER
Check combination meter operation. Refer to DI-12, "
Self-Diagnosis Mode of Combination Meter".
Inspection results OK?
OK >> GO TO 3.
NG >> Replace combination meter. Refer to IP-10, "
Removal and Installation".
3.CHECK LOW TIRE PRESSURE WARNING LAMP
Disconnect BCM harness connector.
Does the low tire pressure warning lamp activate?
YES >> Replace BCM. Refer to BCS-24, "BCM".
NO >> Check combination meter operation. Refer to DI-12, "
Self-Diagnosis Mode of Combination
Meter".
Low Tire Pressure Warning Lamp Stays On When Ignition Switch Is Turned On
INFOID:0000000003532709
DIAGNOSTIC PROCEDURE
1.CHECK BCM CONNECTORS
1. Turn ignition switch OFF.
2. Disconnect BCM harness connectors M18 and M20.
3. Check terminals for damage or loose connections.
Inspection results OK?
OK >> GO TO 2.
NG >> Repair or replace damaged parts.
2.CHECK BCM POWER SUPPLY CIRCUIT (BAT)
Check voltage between BCM harness connector M20 terminal 70 and ground.
1.
OK or NG
OK >> GO TO 3.
NG >> Check BCM power supply circuit for open or short.
3.CHECK BCM POWER SUPPLY CIRCUIT (IGN)
1. Turn ignition switch ON.
2. Check voltage between BCM harness connector M18 terminal 38 and ground.Terminals Voltage
(Approx.)
(+) (–)
Connector Terminal
GroundBattery
voltage
M20 70
WEIA0188E

WT-24
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TROUBLE DIAGNOSIS FOR SYMPTOMS
OK or NG
OK >> GO TO 4.
NG >> Check BCM power supply circuit for open or short.
4.CHECK BCM GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between BCM harness connector M20 terminal 67 and ground.
OK or NG
OK >> Replace BCM. Refer to BCS-24, "BCM".
NG >> Repair BCM ground circuit.
Low Tire Pressure Warning Lamp Flashes When Ignition Switch Is Turned On
INFOID:0000000003532710
NOTE:
If low tire pressure warning lamp flashes as shown, the system is normal.
Flash Mode A
• This mode shows transmitter status is OFF-mode.
Carry out transmitter wake up operation. Refer to WT-14, "
Trans-
mitter Wake Up Operation".
DIAGNOSTIC PROCEDURE
1.CHECK BCM CONNECTORS
1. Turn ignition switch OFF.
2. Disconnect BCM harness connectors M18 and M20.
3. Check terminals for damage or loose connections.
Inspection results OK?
OK >> GO TO 2.
NG >> Repair or replace damaged parts.
2.CHECK TIRE PRESSURE WARNING CHECK CONNECTOR CIRCUIT
Check continuity between BCM harness connector M18 terminal 15 and check connector M123 terminal 1. Terminals Voltage
(Approx.)
(+) (–)
Connector Terminal
GroundBattery
voltage
M18 38
WEIA0038E
Terminals Continuity
(+) (–)
Connector Terminal
Ground Yes
M20 67
WEIA0189E
SEIA0347E

TROUBLE DIAGNOSIS FOR SYMPTOMS
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OK or NG
OK >> Replace BCM. Refer to BCS-24, "BCM" .
NG >> Repair or replace harness connector.
Hazard Warning Lamps Flash When Ignition Switch Is Turned OnINFOID:0000000003532711
DIAGNOSTIC PROCEDURE
1.CHECK BCM GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM harness connector M20.
3. Check continuity between BCM harness connector M20 terminal 67 and ground.
OK or NG
OK >> Replace BCM. Refer to BCS-24, "BCM".
NG >> Repair BCM ground circuit.
"TIRE PRESSURE" Information in Display Unit Does Not ExistINFOID:0000000003532712
DIAGNOSTIC PROCEDURE
1.SELF-DIAGNOSTIC RESULT CHECK
Using CONSULT-II, check display contents in self-diagnostic results.
Is "CAN COMM CIRCUIT" displayed in the self-diagnosis display items?
YES >> Malfunction in CAN communication system. GO TO LAN-40 .
NO >> GO TO 2.
2.CHECK DISPLAY UNIT
Perform display unit self-diagnosis. Refer to AV-101, "
Self-Diagnosis Mode (NAVI)" .
Inspection results OK?
OK >> Replace BCM. Refer to BCS-24, "BCM" .
NG >> Repair or replace malfunctioning parts.
ID Registration Cannot Be CompletedINFOID:0000000003532713
DIAGNOSTIC PROCEDURE
1.PERFORM ID REGISTRATION OF ALL TRANSMITTERS
Carry out ID registration of all transmitters. Refer to WT-12, "
ID Registration Procedure".
Can ID registration of all transmitters be completed?
YES >> Inspection End.
NO >> GO TO WT-20, "
Data from Transmitter Not Being Received". Continuity should exist.
WEIA0097E
Terminals Continuity
(+) (–)
Connector Terminal
Ground Yes
M20 67
WEIA0189E

FRONT WIPER AND WASHER SYSTEM
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FRONT WIPER AND WASHER SYSTEM
Component Parts and Harness Connector LocationINFOID:0000000003533551
System DescriptionINFOID:0000000003533552
• Both front wiper relays are located in the IPDM E/R (intelligent power distribution module engine room).
• The wiper switch (combination switch) is composed of a combination of 5 output terminals and 5 input termi-
nals. Terminal combination status is read by the BCM when the wiper switch is turned ON.
• BCM controls front wiper LO, HI, and INT (intermittent) operation.
• IPDM E/R (intelligent power distribution module engine room) operates the wiper motor according to CAN
communication signals from the BCM.
Power is supplied at all times
• through 50A fusible link (letter f, located in the fuse and fusible link box)
• to BCM terminal 70, and
• through 30A fuse (No. 39, located in the IPDM E/R)
• to front wiper relay (located in the IPDM E/R).
With the ignition switch in ON or START position, power is supplied
• through 10A fuse (No. 9, located in the fuse block J/B)
• to combination switch terminal 14, and
• through 10A fuse (No. 59 located in the fuse and relay box)
• to BCM terminal 38.
Ground is supplied
• to BCM terminal 67 and
• to combination switch terminal 12
• through grounds M57, M61 and M79, and
• to IPDM E/R terminals 38 and 59 and
• to front wiper motor terminal 1
• through grounds E9, E15, and E24.
WKIA5719E
1. IPDM E/R
E118, E119, E120, E121, E122, E123, E1242. Air cleaner case 3. Front and rear washer motor connector
E105
4. Washer fluid reservoir 5. Front wiper motor
E236. Combination switch (wiper switch) M28
7. BCM M18, M20

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FRONT WIPER AND WASHER SYSTEM
LOW SPEED WIPER OPERATION
When the ignition switch is in the ON or START position, and the front wiper switch is turned to the low posi-
tion, the BCM detects a low speed wiper ON request through the combination switch (wiper switch) reading
function. The BCM then sends a front wiper (low) request signal over CAN communication lines
• from BCM terminals 39 and 40
• to IPDM E/R terminals 39 and 40.
When IPDM E/R receives front wiper (low) request signal, it supplies ground to energize the front wiper relay.
With the front wiper relay energized, power is supplied
• through front wiper relay
• to front wiper high relay
• through IPDM E/R terminal 32
• to front wiper motor terminal 3.
With power and ground supplied, the front wiper motor operates at low speed.
HI SPEED WIPER OPERATION
When the ignition switch is in the ON or START position, and the front wiper switch is turned to the high posi-
tion, the BCM detects a high speed wiper ON request through the combination switch (wiper switch) reading
function. The BCM then sends a front wiper (high) request signal over CAN communication lines
• from BCM terminals 39 and 40
• to IPDM E/R terminals 39 and 40.
When the IPDM E/R receives a front wiper (high) request signal, it supplies ground to energize the front wiper
and the front wiper high relays.
With the front wiper and the front wiper high relays energized, power is supplied
• through front wiper relay
• to front wiper high relay
• through IPDM E/R terminal 35
• to front wiper motor terminal 2.
With power and ground supplied, the front wiper motor operates at high speed.
INTERMITTENT OPERATION
Wiper intermittent operation delay interval is determined from the combination of the intermittent wiper dial
position inputs and vehicle speed. During each intermittent operation delay interval, the BCM sends a front
wiper request signal to the IPDM E/R to operate the wipers.
When the ignition switch is in the ON or START position, and the front wiper switch is turned to an intermittent
position, the BCM detects a front wiper (intermittent) ON request through the combination switch (wiper
switch) reading function.
The BCM then sends a front wiper (intermittent) request signal over CAN communication lines
• from BCM terminals 39 and 40
• to IPDM E/R terminals 39 and 40.
When the BCM determines that combination switch status is front wiper intermittent ON, it performs the follow-
ing operations.
• BCM detects ON/OFF status of intermittent wiper dial position.
• BCM calculates operation interval from wiper dial position and vehicle speed signal received through CAN
communications.
• BCM sends front wiper request signal (INT) to IPDM E/R at calculated operation interval.
When the IPDM E/R receives a front wiper request signal (INT), it supplies ground to energize the front wiper
relay. It then sends an auto-stop signal to the BCM, and conducts intermittent front wiper motor operation.
AUTO STOP OPERATION
When the wiper arms are not located at the base of the windshield, and the wiper switch is turned OFF, the
wiper motor will continue to operate until the wiper arms reach the windshield base. When the wiper arms
reach the base of windshield, front wiper motor terminals 6 and 1 are connected.
Ground is supplied
• to IPDM E/R terminal 43
• through front wiper motor terminal 6
• through front wiper motor terminal 1
• through grounds E9, E15, and E24.
The IPDM E/R sends an auto stop operation signal to the BCM through CAN communication lines.
When the BCM receives an auto stop operation signal, the BCM sends wiper stop signal to the IPDM E/R over
CAN communication lines. The IPDM E/R then de-energizes the front wiper relay.
The wiper motor will then stop the wiper arms at the STOP position.

FRONT WIPER AND WASHER SYSTEM
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FRONT WASHER OPERATION
When the ignition switch is in the ON or START position, and the front and rear washer switches are OFF, the
front and rear washer motor is supplied power
• through 10A fuse (No. 9, located in the fuse block J/B)
• through combination switch (wiper switch) terminal 14
• through combination switch (wiper switch) terminal 13
• to front and rear washer motor terminal 1, and
• through combination switch (wiper switch) terminal 11
• to front and rear washer motor terminal 2.
When the front wiper switch is in the front washer position, the BCM detects a front washer signal request
through the combination switch (wiper switch) reading function.
Combination switch ground is supplied
• to front and rear washer motor terminal 2
• through combination switch (wiper switch) terminal 11
• through combination switch (wiper switch) terminal 12
• through grounds M57, M61 and M79.
With ground supplied, the front and rear washer motor is operated in the front direction.
When the BCM detects that front washer motor has operated for 0.4 seconds or longer, the BCM uses CAN
communication and sends a wiper request signal to the IPDM E/R for low speed operation of wipers.
When the BCM detects that the washer switch is OFF, low speed operation cycles approximately 3 times and
then stops.
MIST OPERATION
When the wiper switch is temporarily placed in the mist position, wiper low speed operation cycles once and
then stops. For additional information about wiper operation under this condition, refer to "LOW SPEED
WIPER OPERATION".
If the switch is held in the mist position, low speed operation continues.
FAIL-SAFE FUNCTION
The BCM includes fail-safe function to prevent malfunction of electrical components controlled by CAN com-
munications if a malfunction in CAN communications occurs.
The BCM uses CAN communications to stop output of electrical components it controls.
Until the ignition switch is turned off, the front wiper system remains in same status as just before fail-safe con-
trol was initiated. (If wiper was in low speed operation just before fail-safe, it continues low speed operation
until ignition switch is turned OFF.)
When fail-safe status is initiated, the BCM remains in standby until normal signals are received.
When normal signals are received, fail-safe status is canceled.
COMBINATION SWITCH READING FUNCTION
Refer to BCS-3, "System Description".
CAN Communication System DescriptionINFOID:0000000003533553
Refer to LAN-4.

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FRONT WIPER AND WASHER SYSTEM
Work Flow
INFOID:0000000003533558
1. Confirm the trouble symptom or customer complaint.
2. Understand the system description, refer to WW-3, "
System Description".
3. Perform preliminary inspection, refer to WW-10, "
Preliminary Check".
4. Check symptom and repair or replace the cause of malfunction.
5. Does wiper function operate normally? If it operates normally, GO TO 6. If not, GO TO 4.
6. Inspection End.
Preliminary CheckINFOID:0000000003533559
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 is blown, be sure to eliminate cause of blown fuse before installing new fuse.
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 or short between BCM and fuse.
3.GROUND CIRCUIT INSPECTION (BCM)
Check for continuity between BCM terminal and ground.
OK or NG
OK >> Inspection End.
NG >> Repair/replace BCM ground circuit.
Unit Power source Fuse No.
Front and rear washer motor Ignition switch ON or START 9
Front wiper relay Battery 39
BCMIgnition switch ON or START 59
Battery f
Terminals Ignition switch position
(+)
(–) OFF ON
Connector Terminal
M18 38
Ground0V
Battery voltage
M20 70 Battery voltage
WKIA2089E
Te r m i n a l s
Ignition switch
conditionContinuity
Connector Terminal
M20 67 Ground OFF Yes
WKIA2090E

FRONT WIPER AND WASHER SYSTEM
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CONSULT-II Function (BCM)INFOID:0000000003533560
CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
CONSULT-II START PROCEDURE
Refer to GI-36, "CONSULT-II Start Procedure".
WORK SUPPORT
Operation Procedure
1. Touch "WIPER" on the "SELECT TEST ITEM" screen.
2. Touch "WORK SUPPORT" on the "SELECT DIAG MODE" screen.
3. Touch "WIPER SPEED SETTING" on the "SELECT WORK ITEM" screen.
4. Touch "START".
5. Touch "CHANGE SETT".
6. The setting will be changed and "CUSTOMIZING COMPLETE" will be displayed.
7. Touch "END".
Work Support Setting Item
DATA MONITOR
Display Item List
BCM diagnostic
test itemDiagnostic mode Description
Inspection by partWORK SUPPORTSupports inspections and adjustments. Commands are transmitted to the BCM for
setting the status suitable for required operation, input/output signals are received
from the BCM and received data is displayed.
DATA MONITOR Displays BCM input/output data in real time.
ACTIVE TEST Operation of electrical loads can be checked by sending drive signal to them.
SELF-DIAG RESULTS Displays BCM self-diagnosis results.
CAN DIAG SUPPORT MNTR The result of transmit/receive diagnosis of CAN communication can be read.
ECU PART NUMBER BCM part number can be read.
CONFIGURATION Performs BCM configuration read/write functions.
Item Description CONSULT-II
WIPER SPEED SETTINGWhen wiper switch is at INTERMITTENT, front wiper intermittent
time can be selected according to vehicle speed.
• ON (Operated)/OFF (Not operated)ON/OFF
ALL SIGNALS Monitors all the items.
SELECTION FROM MENU Selects and monitors the individual item selected.
Monitor item name
"OPERATION OR UNIT"Contents
IGN ON SW "ON/OFF"Displays "IGN Position (ON)/OFF, ACC Position (OFF)" status as judged from ignition
switch signal.
IGN SW CAN "ON/OFF"Displays "IGN switch ON (ON)/Other OFF or ACC (OFF)" status as judged from CAN
communications.
FR WIPER HI "ON/OFF" Displays "Front Wiper HI (ON)/Other (OFF)" status as judged from wiper switch signal.
FR WIPER LOW "ON/OFF"Displays "Front Wiper LOW (ON)/Other (OFF)" status as judged from wiper switch sig-
nal.
FR WIPER INT "ON/OFF" Displays "Front Wiper INT (ON)/Other (OFF)" status as judged from wiper switch signal.

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FRONT WIPER AND WASHER SYSTEM
ACTIVE TEST
Display Item List
CONSULT-II Function (IPDM E/R)INFOID:0000000003533561
CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
CONSULT-II START PROCEDURE
Refer to GI-36, "CONSULT-II Start Procedure".
DATA MONITOR
All Items, Main Items, Select Item Menu
NOTE:
Perform monitoring of IPDM E/R data with the ignition switch ON. When the ignition switch is at ACC, the dis-
play may not be correct.
ACTIVE TEST
Display Item List
FR WASHER SW "ON/OFF"Displays "Front Washer Switch (ON)/Other (OFF)" status as judged from wiper switch
signal.
INT VOLUME (1 - 7)Displays intermittent operation dial position setting (1 - 7) as judged from wiper switch
signal.
FR WIPER STOP "ON/OFF" Displays "Stopped (ON)/Operating (OFF)" status as judged from the auto-stop signal.
VEHICLE SPEED "0.0 km/h" Displays vehicle speed as received from CAN communication. Monitor item name
"OPERATION OR UNIT"Contents
Te s t i t e mDisplay on CONSULT-II
screenDescription
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.
IPDM E/R diagnostic Mode Description
SELF-DIAG RESULTS Displays IPDM E/R self-diagnosis results.
DATA MONITOR Displays IPDM E/R input/output data in real time.
CAN DIAG SUPPORT MNTR The result of transmit/receive diagnosis of CAN communication can be read.
ACTIVE TEST Operation of electrical loads can be checked by sending drive signal to them.
ALL SIGNALS Monitors all the items.
MAIN SIGNALS Monitors predetermined items.
SELECTION FROM MENU Selects and monitors the individual item selected.
Item nameCONSULT-II
screen displayDisplay or unitMonitor item selection
Description
ALL
SIGNALSMAIN
SIGNALSSELECTION
FROM MENU
Front wiper re-
questFR WIP REQ STOP/1LO/LO/HI x x x Signal status input from BCM.
Wiper auto stop WIP AUTO STOP ACT P/STOP P x x x Output status of IPDM E/R.
Wiper protection WIP PROT OFF/LS/HS/BLOCK x x x Control status of IPDM E/R.

FRONT WIPER AND WASHER SYSTEM
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Front Wiper Does Not OperateINFOID:0000000003533562
CAUTION:
During IPDM E/R fail-safe control, front wipers may not operate. Refer to PG-17, "
System Description"
to make sure that it is not in fail-safe status.
Inspection Procedure
1.CHECK IPDM E/R TO FRONT WIPERS
With CONSULT-II
1. Select "IPDM E/R" with CONSULT-II, and select "ACTIVE
TEST" on "SELECT DIAG MODE" screen.
2. Select "FRONT WIPER" on "SELECT TEST ITEM" screen.
Without CONSULT-II
1. Turn on front wipers using auto active test. Refer to PG-20,
"Auto Active Test".
2. Confirm front wiper operation.
OK or NG
OK >> GO TO 4.
NG >> GO TO 2.
2.IPDM E/R TO FRONT WIPERS CIRCUIT INSPECTION
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R connectors and front wiper motor connector.
3. Check continuity between IPDM E/R harness connector termi-
nals and front wiper motor harness connector terminals.
4. Check continuity between IPDM E/R harness connector termi-
nals and ground.
Te s t i t e mCONSULT-II
screen displayDescription
Front wiper (HI, LO) output FRONT WIPER With a certain operation (OFF, HI, LO) front wiper relays can be operated.
SKIA3486E
Te r m i n a l s
Continuity
Connector Terminal Connector Terminal
E12132
E233
Ye s 35 2
E122 43 6
WKIA2082E
Te r m i n a l s
Continuity
Connector Terminal
E12132
Ground No 35
E122 43
WKIA2099E