fuse INFINITI QX56 2004 Factory Service Manual

TROUBLE DIAGNOSES
WT-21
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Revision: August 20072004 QX56
Malfunction Code/Symptom ChartEES0012G
Code/Symptom Malfunction partReference
page
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18Front-left tire pressure drops to 193 kPa (2.0 kg/cm
2 , 28 psi) or less
Front-right tire pressure drops to 193 kPa (2.0 kg/cm2 , 28 psi) or less
Rear-right tire pressure drops to 193 kPa (2.0 kg/cm2 , 28 psi) or less
Rear-left tire pressure drops to 193 kPa (2.0 kg/cm2 , 28 psi) or less—
21
22
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24Transmitter no data (front - left)
Transmitter no data (front - right)
Transmitter no data (rear - right)
Transmitter no data (rear - left)WT-23,
"Inspection 1:
Transmitter or
Control Unit
(BCM)"
31
32
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34Transmitter checksum error (front - left)
Transmitter checksum error (front - right)
Transmitter checksum error (rear - right)
Transmitter checksum error (rear - left)WT-23,
"Inspection 2:
Tran s mitte r -
1"
35
36
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38Transmitter pressure data error (front - left)
Transmitter pressure data error (front - right)
Transmitter pressure data error (rear - right)
Transmitter pressure data error (rear - left)WT-24,
"Inspection 3:
Tran s mitte r -
2"
41
42
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44Transmitter function code error (front - left)
Transmitter function code error (front - right)
Transmitter function code error (rear - right)
Transmitter function code error (rear - left)WT-23,
"Inspection 2:
Tran s mitte r -
1"
45
46
47
48Transmitter battery voltage low (front - left)
Transmitter battery voltage low (front - right)
Transmitter battery voltage low (rear - right)
Transmitter battery voltage low (rear - left)WT-23,
"Inspection 2:
Tran s mitte r -
1"
52 Vehicle speed signalWT-25, "Inspection 4:
Vehicle Speed
Signal"
Low tire pressure warning lamp does
not come on when ignition switch is
turned on.Fuse or combination meter
BCM connector or circuit
BCM WT-26,
"Inspection 1:
Low Tire
Pressure
Warning
Lamp Does
Not Come On
When Ignition
Switch Is
Turned On"
Low tire pressure warning lamp stays
on when ignition switch is turned on.Combination meter
BCM connector or circuit
BCMWT-26,
"Inspection 2:
Low Tire
Pressure
Warning
Lamp Stays
On When
Ignition
Switch Is
Turned On"

WT-22
TROUBLE DIAGNOSES
Revision: August 20072004 QX56
Low tire pressure warning lamp
flashes when ignition switch is turned
on.BCM harness connector or circuit
BCM
Transmitter's mode off
ID registration not yet completedWT-28,
"Inspection 3:
Low Tire
Pressure
Warning
Lamp Flashes
When Ignition
Switch Is
Turned On"
Hazard warning lamp flashes when
ignition switch is turned on.BCM harness connector or circuit
BCMWT-29,
"Inspection 4:
Hazard Warn-
ing Lamp
Flashes When
Ignition
Switch Is
Turned On"
“TIRE PRESSURE” information in dis-
play does not exist.Fuse
Display unit
BCM WT-30,
"Inspection 5:
“TIRE PRES-
SURE” Infor-
mation In
Display Unit
Does Not
Exist"
ID registration cannot be completed.Transmitter
Remote keyless entry receiver harness connector or circuit
Remote keyless entry receiver
BCM harness connector or circuit
BCMWT-30,
"Inspection 6:
ID Registra-
tion Cannot
Be Com-
pleted"
Code/Symptom Malfunction partReference
page

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FRONT WIPER AND WASHER SYSTEM
Revision: August 20072004 QX56
FRONT WIPER AND WASHER SYSTEMPFP:28810
Components Parts and Harness Connector LocationEKS007F5
System DescriptionEKS007F6

Both front wiper relays are located in 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 ter-
minals. Terminal combination status is read by the BCM (body control module) when the wiper switch is
turned ON.

BCM controls front wiper LO, HI, and INT (intermittent) operation.

IPDM E/R operates the wiper motor according to CAN communication signals from the BCM.
Power is supplied at all times

to ignition relay, located in the IPDM E/R, and

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
WKIA3400E

FRONT WIPER AND WASHER SYSTEM
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to ignition relay, located in the IPDM E/R, and

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.
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.

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FRONT WIPER AND WASHER SYSTEM
Revision: August 20072004 QX56

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 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 WW-5, "
LOW
SPEED WIPER OPERATION" .
If the switch is held in the mist position, low speed operation continues.
FAIL -S AFE F UN CTI ON
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.

FRONT WIPER AND WASHER SYSTEM
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Terminals and Reference Values for IPDM E/R EKS007FB
Work FlowEKS007FC
1. Confirm the symptom or customer complaint.
2. Understand the system description, refer to WW-4, "
System Description" .
3. Perform preliminary inspection, refer to WW-13, "
Preliminary Inspection" .
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 InspectionEKS007FD
INSPECTION FOR POWER SUPPLY AND GROUND CIRCUIT
Inspection procedure
1. CHECK FUSE
Check if wiper or washer fuse is blown.
35 O/B Combination switch output 2
ON

Light switch and wiper switch OFF

Wiper dial position 4
36 R/W Combination switch output 1
38 W/L Ignition switch (ON) ON — Battery voltage
39 W CAN-H ON — —
40 R CAN-L ON — —
67 B Ground — — 0V
70 W/B Battery power OFF — Battery voltage Te r m i n a l
No.Wire
colorSignal nameMeasuring condition
Reference Value (V)
(Approx.) Igni-
tion
switchOperation or condition
SKIA5292E
Te r m i n a l
No.Wire
colorSignal nameMeasuring condition
Reference value (V)
(Approx.) Ignition
switchOperation or condition
32 L Low speed signal ON Wiper switchOFF 0V
LO Battery voltage
35 L/B High speed signal ON Wiper switchOFF 0V
HI Battery voltage
43 L/Y Wiper auto stop signal ONWiper operating Battery voltage
Wiper stopped 0V
38 B Ground — — 0V
39 W CAN-H ON — —
40 R CAN-L ON — —
59 B Ground — — 0V
Unit Power source Fuse and fusible link No.
Front and rear washer motor Ignition switch ON or START 9
Front wiper relay Battery 39

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FRONT WIPER AND WASHER SYSTEM
Revision: August 20072004 QX56
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" .
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 BCM terminal and ground.
OK or NG
OK >> Inspection End.
NG >> Repair/replace BCM ground circuit.
BCMIgnition switch ON or START 59
Batteryf Unit Power source Fuse and fusible link No.
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
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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Revision: August 20072004 QX56
REAR WIPER AND WASHER SYSTEMPFP:28710
Components Parts and Harness Connector LocationEKS007FO
System DescriptionEKS007FP

The wiper switch (combination switch) is composed of a combination of 5 output terminals and 5 input ter-
minals. Terminal combination status is read by the BCM (body control module) when switch is turned ON.

The BCM controls rear wiper ON and INT (intermittent) operation.
Power is supplied at all times

through 50A fusible link (letter f , located in the fuse and fusible link box)

to BCM terminal 70.
With the ignition switch in ON or START position, power is supplied at all times

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.
REAR WIPER OPERATION
When the ignition switch is in the ON or START position, and the rear wiper switch is in the ON position, the
BCM detects a rear wiper ON request through the combination switch (wiper switch) reading function.
The BCM will first check the status of the glass hatch ajar switch before supplying power to the rear wiper
motor. If the glass hatch ajar switch is closed (ground) the BCM will not turn on the rear wiper motor. If the
glass hatch ajar switch is open (not grounded) the BCM will control the rear wiper motor as follows.
The BCM controls rear wiper motor operation by switching direction of current flow between the two rear wiper
motor output circuits.
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REAR WIPER AND WASHER SYSTEM
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through BCM terminal 67

through grounds M57, M61 and M79.
With output circuit 1 power and ground supplied, the rear wiper motor operates in a counterclockwise sweep
direction until auto stop switch 1 closes (full sweep position). Auto stop switch 1 supplies ground

to BCM terminal 44

through rear wiper motor terminal 2

through rear wiper motor terminal 5

through grounds B117 and B132.
When the BCM receives this ground signal it turns off output circuit 1 and turns on output circuit 2.
Power is supplied to output circuit 2 for reverse operation (clockwise sweep),

through BCM terminal 54

to rear wiper motor terminal 6.
Ground is supplied

to rear wiper motor terminal 4

through BCM terminal 55

through BCM terminal 67

through grounds M57, M61 and M79.
With output circuit 2 power and ground supplied the rear wiper motor operates in a clockwise sweep direction
until auto stop switch 2 closes (full sweep position). Auto stop switch 2 supplies ground

to BCM terminal 26

through rear wiper motor terminal 1

through rear wiper motor terminal 3

through grounds B117 and B132.
When the BCM receives this ground signal it turns off output circuit 2 and starts the timing function of 7 sec-
onds. After approximately 7 seconds the BCM turns on output circuit 1. This process repeats until the rear
wiper switch or ignition switch is turned off.
AUTO STOP OPERATION
When the rear wiper switch is turned off, the BCM will continue the cycle of output circuit 1 or output circuit 2
until auto stop switch 1 and auto stop switch 2 are both in the closed position. When the BCM receives ground
signals from auto stop switch 1 and auto stop switch 2 simultaneously, output circuit 1 and output circuit 2 are
both turned off.
REAR 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 11

to front and rear washer motor terminal 2, and

through combination switch (wiper switch) terminal 13

to front and rear washer motor terminal 1.
When the rear wiper switch is in rear washer position, the BCM detects a rear washer signal by BCM wiper
switch reading function. Combination switch ground is supplied

to front and rear washer motor terminal 1

through combination switch (wiper switch) terminal 13

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 rear direction.
When the BCM detects that the rear washer motor has operated for 0.4 seconds or longer, BCM operates the
rear wiper motor.
When the BCM detects that the rear washer switch is in OFF, the rear wiper motor cycles approximately 3
times and then stops.

REAR WIPER AND WASHER SYSTEM
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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