2005 INFINITI QX4 ignition

LT-90
TURN SIGNAL AND HAZARD WARNING LAMPS
Revision: October 20052005 QX56
Turn Signal Lamp Does Not OperateEKS00B9X
1. CHECK COMBINATION SWITCH INPUT SIGNAL
With CONSULT-II
Select "BCM" on CONSULT-II. With "FLASHER" data monitor, make
sure "TURN SIGNAL R" and "TURN SIGNAL L" turns ON-OFF
linked with operation of lighting switch.
Without CONSULT-II
Refer to LT- 1 0 0 , "
Combination Switch Inspection" .
OK or NG
OK >> GO TO 2.
NG >> Check lighting switch. Refer to LT-100, "
Combination Switch Inspection" .
2. ACTIVE TEST
With CONSULT-II
1. Select "FLASHER" during active test. Refer to LT-89, "
ACTIVE
TEST" .
2. Make sure "FLASHER RH" and "FLASHER LH" operate.
Without CONSULT-II
GO TO 3.
OK or NG
OK >> Replace BCM. Refer to BCS-20, "Removal and Installa-
tion of BCM" .
NG >> GO TO 3.
3. CHECK TURN SIGNAL LAMPS CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM connector and front turn/fog lamp LH and RH
connectors.
3. Check continuity between BCM harness connector M20 terminal
60 (G/B) and front turn/fog lamp LH harness connector E101 ter-
minal 2 (G/B).
4. Check continuity between BCM harness connector M20 terminal
61 (G/Y) and front turn/fog lamp RH harness connector E102
terminal 2 (G/Y).
OK or NG
OK >> GO TO 4.
NG >> Repair harness or connector.When lighting switch is in
TURN RH position: TURN SIGNAL R ON
When lighting switch is in
TURN LH position: TURN SIGNAL L ON
SKIA4499E
SKIA6190E
60 (G/B) - 2 (G/B) : Continuity should exist.
61 (G/Y) - 2 (G/Y) : Continuity should exist.
WKIA1890E

TURN SIGNAL AND HAZARD WARNING LAMPS
LT-93
C
D
E
F
G
H
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J
L
MA
B
LT
Revision: October 20052005 QX56
3. CHECK HAZARD SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM connector and hazard switch connector.
3. Check continuity between BCM harness connector M18 terminal
29 (W/B) and hazard switch harness connector M55 terminal 2
(W/B).
OK or NG
OK >> GO TO 4.
NG >> Repair harness or connector.
4. CHECK GROUND
Check continuity between hazard switch harness connector M55 ter-
minal 1 (B) and ground.
OK or NG
OK >> GO TO 5.
NG >> Repair harness or connector.
5. CHECK HAZARD SWITCH
1. Disconnect hazard switch connector.
2. Check continuity of hazard switch.
OK or NG
OK >> Replace BCM if hazard warning lamps do not work after
setting the connector again. Refer to BCS-20, "
Removal
and Installation of BCM" .
NG >> Replace hazard switch. Refer to LT-96, "
Removal and Installation" .
Turn Signal Indicator Lamp Does Not OperateEKS00BA0
1. CHECK CAN COMMUNICATION SYSTEM
Check CAN communication. Refer to LAN-5, "
CAN COMMUNICATION" .
OK or NG
OK >> Replace combination meter. Refer to IP-13, "Combination Meter" .
NG >> Repair as necessary.29 (W/B) - 2 (W/B) : Continuity should exist.
WKIA1894E
1 (B) - Ground : Continuity should exist.
WKIA1895E
Te r m i n a l
Condition Continuity
Hazard switch
12Hazard switch is ON Yes
Hazard switch is OFF No
WKIA1896E

LT-98
COMBINATION SWITCH
Revision: October 20052005 QX56
Combination Switch Reading FunctionEKS00BA8
For details, refer to BCS-3, "COMBINATION SWITCH READING FUNCTION" .
CONSULT-II Function (BCM)EKS00BA9
CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
CONSULT-II OPERATION
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carries out CAN communication.
1. With the ignition switch OFF, connect CONSULT-II and CON-
SULT-II CONVERTER to the data link connector, then turn igni-
tion switch ON.
2. Touch "START (NISSAN BASED VHCL)".
3. Touch "BCM" on "SELECT SYSTEM" screen.
If "BCM" is not indicated, go to GI-39, "
CONSULT-II Data Link
Connector (DLC) Circuit" .
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.
BBIA0369E
BCIA0029E
BCIA0030E

COMBINATION SWITCH
LT-101
C
D
E
F
G
H
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J
L
MA
B
LT
Revision: October 20052005 QX56
3. HARNESS INSPECTION
1. Turn ignition switch OFF.
2. Disconnect BCM and combination switch connectors.
3. Check for continuity between BCM harness connector of the suspect system and the corresponding com-
bination switch connector terminals.
4. Check for continuity between each terminal of BCM harness connector in suspect malfunctioning system
and ground.
OK or NG
OK >> GO TO 4.
NG >> Check harness between BCM and combination switch for open or short circuit.
Sus-
pect
systemTe r m i n a l s
Continuity BCM Combination switch
ConnectorTe r m i n a l
(Wire color)ConnectorTe r m i n a l
(Wire color)
1
M18Input 1 6 (V)
M286 (V)
Ye s Output 1 36 (R/W) 1 (R/W)
2Input 2 5 (G/B) 7 (G/B)
Output 2 35 (O/B) 2 (O/B)
3Input 3 4 (Y) 10 (Y)
Output 3 34 (L) 3 (L)
4Input 4 3 (G/Y) 9 (G/Y)
Output 4 33 (R/Y) 4 (R/Y)
5Input 5 2 (SB) 8 (SB)
Output 5 32 (R/G) 5 (R/G)
Suspect
systemTe r m i n a l s
Continuity BCM
Connector Terminal (Wire color)
1
M18Input 1 6 (V)
Ground No Output 1 36 (R/W)
2Input 2 5 (G/B)
Output 2 35 (O/B)
3Input 3 4 (Y)
Output 3 34 (L)
4Input 4 3 (G/Y)
Output 4 33 (R/Y)
5Input 5 2 (SB)
Output 5 32 (R/G)
LKIA0284E

LT-102
COMBINATION SWITCH
Revision: October 20052005 QX56
4. BCM OUTPUT TERMINAL INSPECTION
1. Turn lighting switch and wiper switch to OFF.
2. Set wiper dial to position 4.
3. Connect BCM and combination switch connectors.
4. Turn ignition switch ON.
5. Check combination switch input terminal voltage waveform of
suspect malfunctioning system.
OK or NG
OK >> Open circuit in combination switch, GO TO 5.
NG >> Replace BCM. Refer to BCS-20, "
Removal and Installa-
tion of BCM" .
5. COMBINATION SWITCH INSPECTION
Referring to table below, perform combination switch inspection.
>> Inspection End.
Removal and InstallationEKS00BAB
For details, refer to LT- 9 5 , "Removal and Installation" .
Switch Circuit InspectionEKS00BAC
For details, refer to LT-100, "Combination Switch Inspection" .
Suspect systemTerminals
Combination switch (+)
Connector Terminal (Wire color)
1
M28Input 1 1 (R/W)
2 Input 2 2 (O/B)
3 Input 3 3 (L)
4 Input 4 4 (R/Y)
5 Input 5 5 (R/G)
SKIA4976E
Procedure
12 345 67
Replace
lighting
switch.Confirm
check
results.OK INSPECTION END
Confirm
check
results.OK INSPECTION END
Confirm
check
results.OK INSPECTION END
NGReplace wiper
switch.NGReplace switch
base.NGConfirm symptom
again.

LT-108
PARKING, LICENSE PLATE AND TAIL LAMPS
Revision: October 20052005 QX56
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

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
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

PARKING, LICENSE PLATE AND TAIL LAMPS
LT-109
C
D
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F
G
H
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L
MA
B
LT
Revision: October 20052005 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 + 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 –

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-5, "CAN COMMUNICATION" .

LT-114
PARKING, LICENSE PLATE AND TAIL LAMPS
Revision: October 20052005 QX56
Terminals and Reference Values for BCMEKS00BAP
Terminal
No.Wire
colorSignal nameMeasuring condition
Reference value
(Approx.) Ignition
switchOperation or condition
2 SB Combination switch input 5 ONLighting, turn, wiper OFF
Wiper dial position 4
3 G/Y Combination switch input 4 ONLighting, turn, wiper OFF
Wiper dial position 4
4 Y Combination switch input 3 ONLighting, turn, wiper OFF
Wiper dial position 4
5 G/B Combination switch input 2
ONLighting, turn, wiper OFF
Wiper dial position 4
6 V Combination switch input 1
32 R/G Combination switch output 5 ONLighting, turn, wiper OFF
Wiper dial position 4
33 R/Y Combination switch output 4 ONLighting, turn, wiper OFF
Wiper dial position 4
34 L Combination switch output 3 ONLighting, turn, wiper OFF
Wiper dial position 4
SKIA5291E
SKIA5292E
SKIA5291E
SKIA5292E
SKIA5291E
SKIA5292E
SKIA5291E