relay INFINITI QX56 2006 Factory Service Manual

FRONT FOG LAMPLT-77
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4. IPDM E/R INSPECTION
1. Disconnect front turn/fog lamp connectors
2. Start auto active test. Refer to PG-24, "
Auto Active Test" . When
front fog lamp relay is operating, check voltage between left/right
front turn/fog lamp connector terminal and ground.
OK or NG
OK >> Check front fog lamp bulbs and replace as necessary.
NG >> Replace IPDM E/R. Refer to PG-30, "
Removal and Installation of IPDM E/R" .
Front Fog Lamp Does Not Illuminate (One Side)EKS00B9L
1. BULB INSPECTION
Inspect bulbs of lamps which do not illuminate.
OK or NG
OK >> GO TO 2.
NG >> Replace lamp bulb. Refer to LT- 7 9 , "
Bulb Replacement" .
2. INSPECTION BETWEEN IPDM E/R AND FRONT FOG LAMPS
1. Disconnect IPDM E/R connector and inoperative front fog lamp connector.
2. Check continuity between harness connector terminals of IPDM E/R and harness connector terminal of front turn/fog lamps.
OK or NG
OK >> Check ground circuit. If OK, replace IPDM E/R. Refer to PG-30, "
Removal and Installation of IPDM E/R" . If NG,
repair harness or connector.
NG >> Check for short circuits and open circuits in harness between IPDM E/R and front turn/fog lamps.
Front turn/fog lamp (+)
(– ) Voltage
(Approx.)
Connec-
tor Terminal
LH E101 1 Ground Battery voltage
RH E102 1
WKIA1884E
IPDM E/R Front turn/fog lamp Continuity
Connector Terminal Connector Terminal
E123 50 LH E101 1
Ye s
51 RH E102 1
WKIA3553E

LT-80
TURN SIGNAL AND HAZARD WARNING LAMPS
Revision: November 20092006 QX56
TURN SIGNAL AND HAZARD WARNING LAMPSPFP:26120
Component Parts and Harness Connector LocationEKS00B9P
System DescriptionEKS00B9Q
OUTLINE
Power is supplied at all times

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

to BCM (body control module) terminal 70, and

through 10A fuse [No. 19, located in the fuse block (J/B)]

to combination meter terminal 8.
TURN SIGNAL OPERATION
When the ignition switch is in the ON or START position, power is supplied

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

to BCM terminal 38, and

through 10A fuse [No. 14, located in the fuse block (J/B)]

to combination meter terminal 24.
Ground is supplied

to BCM terminal 67 and

to combination meter terminal 17

through grounds M57, M61 and M79.
LH Turn
When the turn signal switch is moved to the left position, the BCM, interpreting it as turn signal is ON, outputs
turn signal from BCM terminal 60.
The BCM supplies power

through BCM terminal 60

to front turn/fog lamp LH terminal 2
WKIA3554E

LT-106
STOP LAMP
Revision: November 20092006 QX56
STOP LAMPPFP:26550
System DescriptionEKS00BAD
Power is supplied at all times

through 10A fuse [No. 20, located in fuse block (J/B)]

to stop lamp switch terminal 3, and

to stop lamp relay terminal 1.
When the brake pedal is pressed, the stop lamp switch is closed and power is supplied

through stop lamp switch terminal 4

to stop lamp relay terminal 3

through stop lamp relay terminal 4

to rear combination lamp LH and RH terminal 2, and

to high-mounted stop lamp terminal 1.
Ground is supplied

to rear combination lamp LH terminal 1, and

to high-mounted stop lamp terminal 2

through grounds B7 and B19, and

to rear combination lamp RH terminal 1

through grounds B117 and B132.
With power and ground supplied, the stop lamps illuminate.

PARKING, LICENSE PLATE AND TAIL LAMPSLT-111
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PARKING, LICENSE PLATE AND TAIL LAMPSPFP:26550
Component Parts and Harness Connector LocationEKS00BAK
System DescriptionEKS00BAL
Control of the parking, license plate, and tail lamp operation is dependent upon the position of the lighting
switch (combination switch). When the lighting switch is placed in the 1ST position, the BCM (body control
module) receives input signal requesting the parking, license plate, side marker and tail lamps to illuminate.
This input signal is communicated to the IPDM E/R (intelligent power distribution module engine room) across
the CAN communication lines. The CPU (central processing unit) of the IPDM E/R controls the tail lamp relay
coil. This relay, when energized, directs power to the parking, license plate and tail lamps, which then illumi-
nate.
Power is supplied at all times

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

to tail lamp relay, located in the IPDM E/R, and

through 20A fuse (No. 53, located in the IPDM E/R)

to CPU of the IPDM E/R, and

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

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

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

to BCM terminal 38

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

to BCM terminal 67

through grounds M57, M61 and M79, and

to IPDM E/R terminals 38 and 59

through grounds E9, E15 and E24.
WKIA3468E

LT-112
PARKING, LICENSE PLATE AND TAIL LAMPS
Revision: November 20092006 QX56
OPERATION BY LIGHTING SWITCH
With the lighting switch in the 1ST or 2ND position (or if the auto light system is activated), the BCM receives
input signal requesting the parking, license plate, side marker and tail lamps to illuminate. This input signal is
communicated to the IPDM E/R across the CAN communication lines. The CPU of the IPDM E/R controls the
tail lamp relay coil, which when energized, directs power

through 10 A fuse (No. 37, located in the IPDM E/R)

through IPDM E/R terminal 57

to front combination lamp LH and RH terminal 3

to license plate lamps terminal 1 and

to rear combination lamp LH and RH terminal 3.
Ground is supplied

to front combination lamp LH and RH terminal 4

through grounds E9, E15 and E24, and

to rear combination lamp LH terminal 1

through grounds B7 and B19, and

to rear combination lamp RH terminal 1 and

to license plate lamps terminal 2

through grounds B117 and B132.
With power and ground supplied, the parking, license plate and tail lamps illuminate.
COMBINATION SWITCH READING FUNCTION
Refer to BCS-3, "COMBINATION SWITCH READING FUNCTION" .
EXTERIOR LAMP BATTERY SAVER CONTROL
When the combination switch (lighting switch) is in the 1ST (or 2ND) position, and the ignition switch is turned
from ON or ACC to OFF, the battery saver control feature is activated.
Under this condition, the parking, license and tail lamps remain illuminated for 5 minutes, then the parking,
license plate and tail lamps are turned off.
Exterior lamp battery saver control mode can be changed by the function setting of CONSULT-II.
CAN Communication System DescriptionEKS00BAM
Refer to LAN-26, "CAN COMMUNICATION" .

PARKING, LICENSE PLATE AND TAIL LAMPSLT-123
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6. CHECK GROUND
1. Check continuity between front combination lamp harness con- nector and ground.
2. Check continuity between license lamps plate connector and ground.
3. Check continuity between rear combination lamp harness con- nector and ground.
OK or NG
OK >> Check bulbs.
NG >> Repair harness or connector.
Parking, License Plate and Tail Lamps Do Not Turn OFF (After Approx. 10 Min-
utes)
EKS00BAV
1. CHECK IPDM E/R
1. Turn ignition switch ON. Turn the combination switch (lighting switch) to the OFF position. Turn ignition switch OFF.
2. Verify that the parking, license plate, and tail lamps turn on and off after approximately 10 minutes.
OK or NG
OK >> Ignition relay malfunction. Refer to PG-19, "Function of Detecting Ignition Relay Malfunction" .
NG >> Inspection End.
Front combination lamp Continuity
Connector Terminal
RH E107 4Ground Yes
LH E11
WKIA1904E
License plate lamps Continuity
Connector Terminal
D703 2Ground Yes
WKIA4615E
Rear combination lamp
Continuity
Connector Terminal
RH B130 1Ground Yes
LH B70
WKIA1905E

LT-126
TRAILER TOW
Revision: November 20092006 QX56
TRAILER TOWPFP:93020
Component Parts and Harness Connector LocationEKS00BB1
System DescriptionEKS00BB2
Power is supplied at all times

to ignition relay, located in the IPDM E/R (intelligent power distribution module engine room), and

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

to BCM (body control module) terminal 70, and

through 10A fuse (No. 32, located in the IPDM E/R)
1. Fuse and fusible link box2. IPDM E/R fuse layout 3. Fuse and relay box
4. IPDM E/R E118, E119, E120, E121, E122, E123, E124 5. A. Steering column
B. Data link connector M22
C. BCM M18, M19, M20
(View with instrument lower panel
LH removed) 6. A. Trailer turn relay LH E156
B. Battery
C. Trailer tow relay 2 E140
D. Trailer turn relay RH E157
7. A. Trailer tow relay 1 M51 B. Electric brake (pre-wiring) M76
(View with instrument lower panel
LH removed) 8. Trailer connector C2
9. Combination switch (lighting switch)
M28
WKIA4616E

TRAILER TOWLT-127
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through IPDM E/R terminal 61

to trailer tow relay 1 terminal 3, and

through 20A fuse (No. 53, located in the IPDM E/R)

to CPU (central processing unit) of the IPDM E/R, and

through 30A fusible link (letter j , located in the fuse and fusible link box)

to trailer tow relay 2 terminals 3 and 6, and

through 40A fusible link (letter k , located in the fuse and fusible link box)

to electric brake (pre-wiring) terminal 5.
With the ignition switch in the ON or START position, power is supplied

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

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

to BCM terminal 38, and

through 10A fuse (No. 51, located in the IPDM E/R)

to trailer tow relay 2 terminal 1.
Ground is supplied

to BCM terminal 67

to electric brake (pre-wiring) terminal 1, and

through grounds M57, M61 and M79, and

to IPDM E/R terminals 38 and 59

to trailer tow relay 1 terminal 2

to trailer tow relay 2 terminal 2, and

to trailer connector terminal 2

to trailer turn relay LH and RH terminal 2

through grounds E9, E15 and E24.
TRAILER TAIL LAMP OPERATION
The trailer tail lamps are controlled by the trailer tow relay 1.
With the lighting switch in the parking and tail lamp ON (1ST) position, AUTO position (and the auto light sys-
tem is activated) or headlamp ON (2ND) position, power is supplied

through the tail lamp relay, located in the IPDM E/R

through 10A fuse (No. 36, located in the IPDM E/R)

through IPDM E/R terminal 49

to trailer tow relay 1 terminal 1.
When energized, trailer tow relay 1 supplies tail lamp power to trailer connector terminal 6.
TRAILER BRAKE, TURN SIGNAL AND HAZARD LAMP OPERATION
The trailer brake, turn signal and hazard lamps are controlled by the BCM through trailer turn relays (LH and
RH). When the brake pedal is depressed, the BCM receives stop lamp switch signal through CAN communi-
cation. If the brake pedal is depressed or either turn signal or the hazard lamps are turned on, the BCM sup-
plies voltage to the trailer turn relays (LH and RH) to make them cycle on and off.
Trailer turn relay LH output is supplied

through BCM terminal 52

to trailer turn relay LH terminal 1.
Trailer turn relay RH output is supplied

through BCM terminal 51

to trailer turn relay RH terminal 1.
Left trailer brake, turn signal and hazard lamp output is supplied

through trailer turn relay LH terminal 3

to trailer connector terminal 1.
Right trailer brake, turn signal and hazard lamp output is supplied

through trailer turn relay RH terminal 3

LT-128
TRAILER TOW
Revision: November 20092006 QX56

to trailer connector terminal 4.
TRAILER BRAKE OPERATION
The trailer brake is controlled by the electric brake. The electric brake receives stop lamp switch signal at elec-
tric brake (pre-wiring) terminal 2 when the brake pedal is depressed.
When the brake pedal is depressed, power is supplied by the electric brake

through electric brake (pre-wiring) terminal 3

to trailer connector terminal 3.
TRAILER POWER SUPPLY OPERATION
The trailer power supply is controlled by the trailer tow relay 2.
When the ignition switch is in the ON or START position, power is supplied

through 10A fuse (No. 51, located in the IPDM E/R)

through IPDM E/R terminal 16

to trailer tow relay 2 terminal 1.
When energized, the trailer tow relay 2 supplies power

through trailer tow relay 2 terminals 5 and 7

to trailer connector terminal 5.

INTERIOR ROOM LAMPLT-135
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System DescriptionEKS00BB6
When room lamp and personal lamp switch is in DOOR position, room lamp and personal lamp ON/OFF is
controlled by timer according to signals from switches including key switch and key lock solenoid, front door
switch LH, unlock signal from keyfob, door lock and unlock switch, front door lock assembly LH (key cylinder
switch), ignition switch, and glass hatch ajar switch.
When room lamp and personal lamp turns ON, there is a gradual brightening over 1 second. When room lamp
and personal lamp turns OFF, there is a gradual dimming over 1 second.
The room lamp and personal lamp timer is controlled by the BCM (body control module).
Room lamp and personal lamp timer control settings can be changed with CONSULT-II.
Ignition keyhole illumination turns ON when front door LH is opened (door switch ON) or key is removed from
key cylinder. Illumination turns OFF when front door LH is closed (door switch OFF).
Step and foot lamps turn ON when front or rear doors are opened (door switch ON). Lamps turn OFF when
front and rear doors are closed (all door switches OFF).
POWER SUPPLY AND GROUND
Power is supplied at all times

through 10A fuse [No. 19, located in the fuse block (J/B)]

to key switch and key lock solenoid terminal 3, and

through 15A fuse [No. 22, located in the fuse block (J/B)]

to BCM terminal 57, and

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

to BCM terminal 70.
When the key is inserted in key switch and key lock solenoid, power is supplied

through the key switch and key lock solenoid terminal 4

to BCM terminal 37.
With the ignition switch in the ON or START position, power is supplied

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

to BCM terminal 38.
Ground is supplied

to BCM terminal 67

through grounds M57, M61 and M79.
When the front door LH is opened, ground is supplied

to BCM terminal 47

through case ground of front door switch LH.
When the front door RH is opened, ground is supplied

to BCM terminal 12

through case ground of front door switch RH.
When the rear door LH is opened, ground is supplied

to BCM terminal 48

through case ground of rear door switch LH.
When the rear door RH is opened, ground is supplied

to BCM terminal 13

through case ground of rear door switch RH.
When the liftgate is opened, ground is supplied

to BCM terminal 43

through back door latch (door ajar switch) terminal 7

through back door latch (door ajar switch) terminal 8

through grounds B7 and B19.
When the glass hatch is opened, ground is supplied

to BCM terminal 42

through case ground of glass hatch ajar switch.