relay INFINITI QX56 2004 Factory Service Manual

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SERVICE INFORMATION FOR ELECTRICAL INCIDENT
Revision: August 20072004 QX56

Freezing

Water intrusion

Electrical load

Cold or hot start up
Get a thorough description of the incident from the customer. It is important for simulating the conditions of the
problem.
Vehicle Vibration
The problem may occur or become worse while driving on a rough road or when engine is vibrating (idle with
A/C on). In such a case, you will want to check for a vibration related condition. Refer to the following illustra-
tion.
CONNECTORS & HARNESS
Determine which connectors and wiring harness would affect the electrical system you are inspecting. Gently
shake each connector and harness while monitoring the system for the incident you are trying to duplicate.
This test may indicate a loose or poor electrical connection.
HINT
Connectors can be exposed to moisture. It is possible to get a thin film of corrosion on the connector termi-
nals. A visual inspection may not reveal this without disconnecting the connector. If the problem occurs inter-
mittently, perhaps the problem is caused by corrosion. It is a good idea to disconnect, inspect and clean the
terminals on related connectors in the system.
SENSORS & RELAYS
Gently apply a slight vibration to sensors and relays in the system you are inspecting.
This test may indicate a loose or poorly mounted sensor or relay.
ENGINE COMPARTMENT
There are several reasons a vehicle or engine vibration could cause an electrical complaint. Some of the
things to check for are:

Connectors not fully seated.

Wiring harness not long enough and is being stressed due to engine vibrations or rocking.

Wires laying across brackets or moving components.

Loose, dirty or corroded ground wires.

Wires routed too close to hot components.
To inspect components under the hood, start by verifying the integrity of ground connections. (Refer to Ground
Inspection described later.) First check that the system is properly grounded. Then check for loose connection
by gently shaking the wiring or components as previously explained. Using the wiring diagrams inspect the
wiring for continuity.
BEHIND THE INSTRUMENT PANEL
An improperly routed or improperly clamped harness can become pinched during accessory installation. Vehi-
cle vibration can aggravate a harness which is routed along a bracket or near a screw.
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SERVICE INFORMATION FOR ELECTRICAL INCIDENT
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Cold or Hot Start Up
On some occasions an electrical incident may occur only when the car is started cold, or it may occur when
the car is restarted hot shortly after being turned off. In these cases you may have to keep the car overnight to
make a proper diagnosis.
CIRCUIT INSPECTION
Introduction
In general, testing electrical circuits is an easy task if it is approached in a logical and organized method.
Before beginning it is important to have all available information on the system to be tested. Also, get a thor-
ough understanding of system operation. Then you will be able to use the appropriate equipment and follow
the correct test procedure.
You may have to simulate vehicle vibrations while testing electrical components. Gently shake the wiring har-
ness or electrical component to do this.
NOTE:
Refer to “How to Check Terminal” to probe or check terminal.
Testing for “Opens” in the Circuit
Before you begin to diagnose and test the system, you should rough sketch a schematic of the system. This
will help you to logically walk through the diagnosis process. Drawing the sketch will also reinforce your work-
ing knowledge of the system.
CONTINUITY CHECK METHOD
The continuity check is used to find an open in the circuit. The digital multimeter (DMM) set on the resistance
function will indicate an open circuit as over limit (no beep tone or no ohms symbol). Make sure to always start
with the DMM at the highest resistance level.
To help in understanding the diagnosis of open circuits, please refer to the previous schematic.

Disconnect the battery negative cable.

Start at one end of the circuit and work your way to the other end. (At the fuse block in this example)

Connect one probe of the DMM to the fuse block terminal on the load side.

Connect the other probe to the fuse block (power) side of SW1. Little or no resistance will indicate that
portion of the circuit has good continuity. If there were an open in the circuit, the DMM would indicate an
over limit or infinite resistance condition. (point A)

Connect the probes between SW1 and the relay. Little or no resistance will indicate that portion of the cir-
cuit has good continuity. If there were an open in the circuit, the DMM would indicate an over limit or infi-
nite resistance condition. (point B)

Connect the probes between the relay and the solenoid. Little or no resistance will indicate that portion of
the circuit has good continuity. If there were an open in the circuit, the DMM would indicate an over limit or
infinite resistance condition. (point C)
Any circuit can be diagnosed using the approach in the previous example.
OPEN A circuit is open when there is no continuity through a section of the circuit.
SHORTThere are two types of shorts.

SHORT CIRCUITWhen a circuit contacts another circuit and causes the normal resistance to
change.

SHORT TO GROUND When a circuit contacts a ground source and grounds the circuit.
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SERVICE INFORMATION FOR ELECTRICAL INCIDENT
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VOLTAGE CHECK METHOD
To help in understanding the diagnosis of open circuits please refer to the previous schematic.
In any powered circuit, an open can be found by methodically checking the system for the presence of voltage.
This is done by switching the DMM to the voltage function.

Connect one probe of the DMM to a known good ground.

Begin probing at one end of the circuit and work your way to the other end.

With SW1 open, probe at SW1 to check for voltage.
voltage; open is further down the circuit than SW1.
no voltage; open is between fuse block and SW1 (point A).

Close SW1 and probe at relay.
voltage; open is further down the circuit than the relay.
no voltage; open is between SW1 and relay (point B).

Close the relay and probe at the solenoid.
voltage; open is further down the circuit than the solenoid.
no voltage; open is between relay and solenoid (point C).
Any powered circuit can be diagnosed using the approach in the previous example.
Testing for “Shorts” in the Circuit
To simplify the discussion of shorts in the system, please refer to the following schematic.
RESISTANCE CHECK METHOD

Disconnect the battery negative cable and remove the blown fuse.

Disconnect all loads (SW1 open, relay disconnected and solenoid disconnected) powered through the
fuse.

Connect one probe of the DMM to the load side of the fuse terminal. Connect the other probe to a known
good ground.

With SW1 open, check for continuity.
continuity; short is between fuse terminal and SW1 (point A).
no continuity; short is further down the circuit than SW1.

Close SW1 and disconnect the relay. Put probes at the load side of fuse terminal and a known good
ground. Then, check for continuity.
continuity; short is between SW1 and the relay (point B).
no continuity; short is further down the circuit than the relay.

Close SW1 and jump the relay contacts with jumper wire. Put probes at the load side of fuse terminal and
a known good ground. Then, check for continuity.
continuity; short is between relay and solenoid (point C).
no continuity; check solenoid, retrace steps.
VOLTAGE CHECK METHOD

Remove the blown fuse and disconnect all loads (i.e. SW1 open, relay disconnected and solenoid discon-
nected) powered through the fuse.

Turn the ignition key to the ON or START position. Verify battery voltage at the battery + side of the fuse
terminal (one lead on the battery + terminal side of the fuse block and one lead on a known good ground).

With SW1 open and the DMM leads across both fuse terminals, check for voltage.
voltage; short is between fuse block and SW1 (point A).
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SERVICE INFORMATION FOR ELECTRICAL INCIDENT
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no voltage; short is further down the circuit than SW1.

With SW1 closed, relay and solenoid disconnected and the DMM leads across both fuse terminals, check
for voltage.
voltage; short is between SW1 and the relay (point B).
no voltage; short is further down the circuit than the relay.

With SW1 closed, relay contacts jumped with fused jumper wire check for voltage.
voltage; short is down the circuit of the relay or between the relay and the disconnected solenoid (point C).
no voltage; retrace steps and check power to fuse block.
Ground Inspection
Ground connections are very important to the proper operation of electrical and electronic circuits. Ground
connections are often exposed to moisture, dirt and other corrosive elements. The corrosion (rust) can
become an unwanted resistance. This unwanted resistance can change the way a circuit works.
Electronically controlled circuits are very sensitive to proper grounding. A loose or corroded ground can drasti-
cally affect an electronically controlled circuit. A poor or corroded ground can easily affect the circuit. Even
when the ground connection looks clean, there can be a thin film of rust on the surface.
When inspecting a ground connection follow these rules:

Remove the ground bolt or screw.

Inspect all mating surfaces for tarnish, dirt, rust, etc.

Clean as required to assure good contact.

Reinstall bolt or screw securely.

Inspect for “add-on” accessories which may be interfering with the ground circuit.

If several wires are crimped into one ground eyelet terminal, check for proper crimps. Make sure all of the
wires are clean, securely fastened and providing a good ground path. If multiple wires are cased in one
eyelet make sure no ground wires have excess wire insulation.
For detailed ground distribution information, refer to “Ground Distribution” in PG section.
Voltage Drop Tests
Voltage drop tests are often used to find components or circuits which have excessive resistance. A voltage
drop in a circuit is caused by a resistance when the circuit is in operation.
Check the wire in the illustration. When measuring resistance with DMM, contact by a single strand of wire will
give reading of 0 ohms. This would indicate a good circuit. When the circuit operates, this single strand of wire
is not able to carry the current. The single strand will have a high resistance to the current. This will be picked
up as a slight voltage drop.
Unwanted resistance can be caused by many situations as follows:

Undersized wiring (single strand example)

Corrosion on switch contacts

Loose wire connections or splices.
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GW-2Revision: August 20072004 QX56 Rear Power Window Switch LH or RH Power Supply
and Ground Circuit Check ...................................... 58
Rear Power Window Motor LH Circuit Check ......... 58
Rear Power Window Motor RH Circuit Check ........ 59
Limit Switch Circuit Check Rear LH and RH ........... 60
Encoder Circuit Check Rear LH or RH ................... 62
Power Window Serial Link Check Rear LH or RH ... 64
Rear Power Vent Window Switch Circuit Check ..... 65
Rear Power Vent Window Motor LH Circuit Check ... 65
Rear Power Vent Window Motor RH Circuit Check ... 66
Rear Power Vent Window Relay (OPEN) Check .... 66
Rear Power Vent Window Relay (CLOSE) Check ... 67
FRONT DOOR GLASS AND REGULATOR ............. 69
Removal and Installation ........................................ 69
FRONT DOOR GLASS ....................................... 69
FRONT DOOR GLASS REGULATOR ................ 70
FITTING INSPECTION AND SETTING AFTER
INSTALLATION .................................................... 70
REAR DOOR GLASS AND REGULATOR ............... 72
Removal and Installation ........................................ 72
REAR DOOR GLASS .......................................... 72
REAR DOOR GLASS REGULATOR ................... 73
SIDE WINDOW GLASS ............................................ 75
Removal and Installation ........................................ 75
REMOVAL ........................................................... 75
INSTALLATION .................................................... 75
INSIDE MIRROR ....................................................... 76
Wiring Diagram — I/MIRR — ................................. 76
Removal and Installation ........................................ 77
INSIDE MIRROR ................................................. 77
REAR WINDOW DEFOGGER .................................. 78
Component Parts and Harness Connector Location ... 78
System Description ................................................. 79CAN Communication System Description ..............80
Schematic ...............................................................81
Wiring Diagram — DEF — ......................................82
Terminal and Reference Value for BCM ..................85
Terminal and Reference Value for IPDM E/R ..........85
Work Flow ...............................................................85
CONSULT-II Function (BCM) ..................................86
CONSULT-II BASIC OPERATION PROCEDURE
...86
DATA MONITOR ..................................................87
ACTIVE TEST ......................................................87
Trouble Diagnoses Symptom Chart ........................87
BCM Power Supply and Ground Circuit Check ......89
Rear Window Defogger Switch Circuit Check .........90
Rear Window Defogger Power Supply Circuit
Check ......................................................................91
Rear Window Defogger Circuit Check ....................92
Door Mirror Defogger Power Supply Circuit Check ...92
Door Mirror LH Defogger Circuit Check ..................94
Door Mirror RH Defogger Circuit Check .................95
Rear Window Defogger Signal Check ....................96
Filament Check .......................................................96
Filament Repair .......................................................97
REPAIR EQUIPMENT .........................................97
REPAIRING PROCEDURE .................................97
DOOR MIRROR .........................................................99
Wiring Diagram — MIRROR — ..............................99
Door Mirror Assembly ........................................... 100
REMOVAL .......................................................... 100
INSTALLATION .................................................. 100
Door Mirror Glass .................................................. 100
REMOVAL .......................................................... 100
INSTALLATION .................................................. 101

POWER WINDOW SYSTEM
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POWER WINDOW SYSTEMPFP:25401
Component Parts and Harness Connector LocationEIS002UM
System DescriptionEIS002UN
Power is supplied at all time

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

to BCM terminal 70

through BCM terminal 69

to main power window and door lock/unlock switch terminal 19

to power window and door lock/unlock switch RH terminal 10.
With ignition switch in ON or START position,
Power is supplied

through 10A fuse (No. 59, located in the fuse and relay box)

to BCM terminal 38

through BCM terminal 68

to main power window and door lock/unlock switch terminal 10.

to rear power vent window relays (OPEN and CLOSE) terminal 1.
With ignition switch in ON or START position,
Ground is supplied

to BCM terminal 67

to main power window and door lock/unlock switch terminal 17

to power window and door lock/unlock switch RH terminal 11

through body grounds M57, M61 and M79.
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POWER WINDOW SYSTEM
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to rear power window control unit LH or RH terminal 1

through rear power window control unit LH or RH terminal 7

through rear power window switch LH or RH terminal 2 and 3

through rear power window switch LH or RH terminal 5

through rear power window control unit LH or RH terminal 11

to rear power window motor LH or RH terminal 2.
Ground is supplied

to rear power window control unit LH or RH terminal 15

through rear power window control unit LH or RH terminal 16

through rear power window switch LH or RH terminal 1 and 7

through rear power window switch LH or RH terminal 4

through rear power window control unit LH or RH terminal 12

to rear power window motor LH or RH terminal 1.
Then, the motor raises the window until the switch is released.
WINDOW DOWN
When the rear power window switch LH or RH is pressed in the down position
Power is supplied

to rear power window control unit LH or RH terminal 1

through rear power window control unit LH or RH terminal 7

through rear power window switch LH or RH terminal 2 and 3

through rear power window switch LH or RH terminal 4

through rear power window control unit LH or RH terminal 12

to rear power window motor LH or RH terminal 1.
Ground is supplied

to rear power window control unit LH or RH terminal 15

through rear power window control unit LH or RH terminal 16

through rear power window switch LH or RH terminal 1 and 7

through rear power window switch LH or RH terminal 5

through rear power window control unit LH or RH terminal 11

to rear power window motor LH or RH terminal 2.
Then, the motor lowers the window until the switch is released.
MAIN POWER WINDOW AND DOOR LOCK/UNLOCK SWITCH OPERATION
Signal is sent

through main power window and door lock/unlock switch terminal 14

to rear power window control unit LH or RH terminal 1.
The operation of power window after receiving the signal is the same as operating the power window with rear
power window switch LH or RH.
VENT WINDOW CLOSE
When the rear power vent window switch is pressed in the close position
Power is supplied

to rear power vent window relay (CLOSE) terminal 5

through rear power vent window relay (CLOSE) terminal 3

to rear power vent window motors terminal 2.
Ground is supplied

to rear power vent window relay (OPEN) terminal 4

through rear power vent window relay (OPEN) terminal 3

to rear power vent window motors terminal 1.
Then, the motors close the windows until the switch is released.
VENT WINDOW OPEN
When the main power window and door lock/unlock switch (rear LH) is pressed in the open position
Power is supplied

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POWER WINDOW SYSTEM
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to rear power vent window relay (OPEN) terminal 5

through rear power vent window relay (OPEN) terminal 3

to rear power vent window motors terminal 1.
Ground is supplied

to rear power vent window relay (CLOSE) terminal 4

through rear power vent window relay (CLOSE) terminal 3

to rear power vent window motors terminal 2.
Then, the motors open the windows until the switch is released.
AUTO OPERATION
The power window AUTO feature enables the driver to open or close the window without holding the window
switch in the down or up position.
POWER WINDOW SERIAL LINK
Main power window and door lock/unlock switch, power window and door lock/unlock switch RH, rear power
window control units and BCM transmit and receive the signal by power window serial link.
The signal is transmitted from BCM to main power window and door lock/unlock switch and power window and
door lock/unlock switch RH

Keyless power window down signal.

Rear power window switch illumination.
The signal is transmitted from main power window and door lock/unlock switch to power window and door
lock/unlock switch RH

Front door window RH operation signal.

Power window control by front door lock assembly LH (key cylinder switch) signal.

Power window lock signal.

Retained power operation signal.

Rear power window operation.
POWER WINDOW LOCK
The power window lock is designed to lock operation of all windows except for front door window LH.
When in the lock position, the power window lock signal is transmitted to power window and door lock/unlock
switch RH by power window serial link. This prevents the power window motor from operating.
RETAINED POWER OPERATION
When the ignition switch is turned to the OFF position from ON or START position.
Power is supplied for 45 seconds

to main power window and door lock/unlock switch terminal 10

from BCM terminal 68.
When power and ground are supplied, the BCM continues to be energized, and the power window can be
operated.
The retained power operation is canceled when the front LH or front RH door is opened.
RAP signal period can be changed by CONSULT-II. Refer to GW-33, "
CONSULT-II Function (BCM)" .
ANTI-PINCH SYSTEM
Main power window and door lock/unlock switch, power window and door lock/unlock switch RH and rear
power window control unit LH and RH monitors the power window motor operation and the power window
position (full closed or other) for each power window by the signals from encoder and limit switch in power win-
dow motor.
When a window switch detects interruption during the following close operation,

automatic close operation when ignition switch is in the ON position

automatic close operation during retained power operation
Main power window and door lock/unlock switch, power window and door lock/unlock switch RH and rear
power window control unit LH and RH controls each power window motor for open and the power window will
be lowered about 150 mm (5.91 in).

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Trouble Diagnoses Symptom ChartEIS0 02 UW

Check that other systems using the signal of the following systems operate normally.
Symptom Repair order Refer to page
None of the power windows can be operated using any switch1. BCM power supply and ground circuit checkGW-38
2. Main power window and door lock/unlock
power supply and ground circuit checkGW-39
3. Power window serial link check front LH and
RHGW-40
Front power window LH alone does not operate1. Main power window and door lock/unlock
power supply and ground circuit checkGW-392. Front power window motor LH circuit checkGW-41
3. Replace main power window and door lock/
unlock switchEI-31
Front power window RH alone does not operate1. Power window and door lock/unlock switch
RH power supply and ground circuit checkGW-402. Power window serial link check front LH and
RHGW-54
3. Front power window motor RH circuit checkGW-42
4. Replace BCMBCS-19
Rear power window LH alone does not operate1. Rear power window control unit LH or RH
power supply and ground circuit checkGW-56
2. Rear power window switch LH or RH power
supply and ground circuit checkGW-58
3. Rear power window motor LH circuit checkGW-58
4. Power window serial link check rear LH and
RHGW-64
5. Replace BCMBCS-19
Rear power window RH alone does not operate1. Rear power window control unit LH or RH
power supply and ground circuit checkGW-56
2. Rear power window switch LH or RH power
supply and ground circuit checkGW-58
3. Rear power window motor RH circuit checkGW-59
4. Power window serial link check rear LH and
RHGW-64
5. Replace BCMBCS-19
Rear power vent windows do not operate 1. Rear power vent window switch circuit checkGW-65
Rear power vent window LH alone does not operate1. Rear power vent window motor LH circuit
checkGW-65
Rear power vent window RH alone does not operate1. Rear power vent window motor RH circuit
checkGW-66
Rear power vent windows do not open1. Rear power vent window relay (OPEN)
checkGW-65
Rear power vent windows do not close1. Rear power vent window relay (CLOSE)
checkGW-65

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BCM Power Supply and Ground Circuit CheckEIS002UX
1. CHECK FUSE AND FUSIBLE LINK
Check 50A fusible link (letter f located in the fuse and fusible link box).
Check 10A fuse (No. 59, located in the fuse and relay box).
NOTE:
Refer to GW-15, "
Component Parts and Harness Connector Location" .
OK or NG
OK >> GO TO 2.
NG >> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse. Refer to PG-
3, "PRECAUTIONS" .
2. CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch ON.
2. Check voltage between BCM connector M18, M20 terminals 11, 38, 70 and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace harness.
3. CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM.
3. Check continuity between BCM connector M20 terminal 67 and ground.
OK or NG
OK >> Power supply and ground circuit is OK.
NG >> Repair or replace harness.11 (O) - Ground : Battery voltage
38 (W/L) - Ground : Battery voltage
70 (W/B) - Ground : Battery voltage
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67 (B) - Ground : Continuity should exist.
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