Air INFINITI QX56 2010 Factory Service Manual

WCS
SEAT BELT BUCKLE SWITCH SIGNAL CIRCUIT
WCS-19
< COMPONENT DIAGNOSIS >
C
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M B A
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SEAT BELT BUCKLE SW ITCH SIGNAL CIRCUIT
DescriptionINFOID:0000000005146158
Transmits a seat belt buckle switch signal to the combination meter.
Component Function CheckINFOID:0000000005146159
1.CHECK COMBINATION METER INPUT SIGNAL
Select “DATA MONITOR” for “METER/M&A” and check the “SEAT BELT W/L” monitor value.
>> Inspection End.
Diagnosis ProcedureINFOID:0000000005146160
Regarding Wiring Diagram information, refer to WCS-23, "Wiring Diagram".
1.CHECK COMBINATION METER INPUT SIGNAL
1. Turn ignition switch ON.
2. Check voltage between combination meter harness connector M24 terminal 24 and ground.
Is the inspection result normal?
YES >> Replace combination meter. Refer to MWI-100,
"Removal and Installation".
NO >> GO TO 2
2.CHECK SEAT BELT BUCKLE SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect combination meter connector and seat belt buckle pre-tensioner assembly LH (seat belt buckle switch) connector.
3. Check continuity between combination meter harness connector M24 (B) terminal 24 and seat belt buckle pre-tensioner assem-
bly LH (seat belt buckle switch ) harness connector B74 (A) ter-
minal 4.
4. Check continuity between combination meter harness connector M24 (B) terminal 24 and ground.
Is the inspection result normal?
YES >> GO TO 3
NO >> Repair harness or connector.
3.CHECK SEAT BELT BUCKLE SWITCH GROUND CIRCUIT SEAT BELT W/L
When seat belt is fastened : OFF
When seat belt is unfastened : ON
24 - Ground
When driver seat belt is fastened : Approx. 12V
When driver seat belt is unfastened : Approx. 0V
AWNIA0212ZZ
24 - 4
: Continuity should exist.
24 - Ground : Continuity should not exist.
AWNIA0213ZZ
Revision: April 20092010 QX56

WCS-20
< COMPONENT DIAGNOSIS >
SEAT BELT BUCKLE SWITCH SIGNAL CIRCUIT
Check continuity between seat belt buckle pre-tensioner assembly
LH (seat belt buckle switch) harness connector B74 terminal 3 and
ground.
Is the inspection result normal?
YES >> Inspection End.
NO >> Repair harness or connector.
Component InspectionINFOID:0000000005146161
1.CHECK SEAT BELT BUCKLE SWITCH
1. Turn ignition switch OFF.
2. Disconnect the seat belt buckle pre-tensioner assembly LH (seat belt buckle switch) connector.
3. Check continuity between terminals 3 and 4.
Is the inspection result normal?
YES >> Inspection End.
NO >> Replace the seat belt buckle pre-tensioner assembly LH (seat belt buckle switch).
3 - Ground : Continuity should exist.
AWNIA0288ZZ
3– 4
When seat belt is
fastened
: Continuity should not exist.
When seat belt is
unfastened : Continuity should exist.
AWNIA0289ZZ
Revision: April 20092010 QX56

WCS
KEY SWITCH SIGNAL CIRCUITWCS-21
< COMPONENT DIAGNOSIS >
C
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M B A
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KEY SWITCH SIGNAL CIRCUIT
DescriptionINFOID:0000000005146162
Transmits a key switch signal to the BCM.
Component Function CheckINFOID:0000000005146163
1.CHECK BCM INPUT SIGNAL
Select “DATA MONITOR” for “BCM” and c heck the “KEY ON SW” monitor value.
>> Inspection End.
Diagnosis ProcedureINFOID:0000000005146164
Regarding Wiring Diagram information, refer to WCS-23, "Wiring Diagram".
1.CHECK FUSE
Check if the key switch and ignition knob switch 10A fuse (No. 62, located in the fuse and relay box) is blown.
Is the fuse blown?
YES >> Be sure to repair the cause of malfunction before installing new fuse.
NO >> GO TO 2
2.CHECK BCM INPUT SIGNAL
Check voltage between BCM harness connector and ground.
Is the inspection result normal?
YES >> Inspection End.
NO >> GO TO 3
3.CHECK KEY SWITCH CIRCUIT
1. Disconnect BCM and key switch and ignition knob switch con- nectors.
2. Check continuity between BCM harness connector M18 and key
switch and ignition knob switch harness connector M12.
3. Check continuity between BCM harness connector M18 and ground.KEY ON SW
When key is inserted into key cylinder : ON
When key is removed from key cylinder : OFF
Te r m i n a l s
ConditionVo l ta g e
(Approx.)
(+)
(−)
BCM
connector Te r m i n a l
M18 37 Ground Key is inserted Battery voltage
Key is removed 0
PKIC0721E
AB
Continuity
Connector Terminal Connector Terminal
M18 37M12 4 Yes
AWNIA0159ZZ
Revision: April 20092010 QX56

WCS-22
< COMPONENT DIAGNOSIS >
KEY SWITCH SIGNAL CIRCUIT
Is the inspection result normal?
YES >> GO TO 4
NO >> Repair harness or connector.
4.CHECK KEY SWITCH POWER SUPPLY CIRCUIT
Check voltage between key switch and ignition knob switch harness
connector and ground.
Is the inspection result normal?
YES >> Replace key switch and ignition knob switch.
NO >> Repair harness or connector.
Component InspectionINFOID:0000000005146165
1.CHECK KEY SWITCH
1. Turn ignition switch OFF.
2. Disconnect key switch and ignition knob switch connector.
3. Check continuity between key switch and ignition knob switch terminals 3 and 4.
Is the inspection result normal?
YES >> Inspection End.
NO >> Replace key switch and ignition knob switch.
A GroundContinuity
Connector Terminal
M18 37 No
Te r m i n a l s
Voltag e
(Approx.)
(+)
(−)
Key switch and ignition
knob switch connector Terminal
M12 3Ground Battery voltage
AWNIA0160ZZ
3 – 4
When key is inserted
into key cylinder : Continuity should exist.
When key is removed
from key cylinder : Continuity should not exist.
AWNIA0158ZZ
Revision: April 20092010 QX56

WCS-28
< ECU DIAGNOSIS >
COMBINATION METER
ECU DIAGNOSIS
COMBINATION METER
Reference ValueINFOID:0000000005382408
TERMINAL LAYOUT
PHYSICAL VALUES
WKIA5724E
Te r m i -nal Wire
color Item Condition
Reference value (V)
(Approx.)
Ignition
switch Operation or condition
3 Y/L Fuel level sensor signal — —Refer to MWI-12, "
FUEL GAUGE : System
Description".
4 B/P Fuel level sensor ground ON —0
6 BR/W Generator ONGenerator voltage low
0
Generator voltage normal Battery voltage
10 L CAN-H —— —
11 P C A N - L —— —
13 P Air bag warning lamp in-
put ONAir bag warning lamp ON
4
Air bag warning lamp OFF 0
15 BR CK SUSP warning lamp
input —CK SUSP warning lamp
ON
0
CK SUSP warning lamp
OFF Battery voltage
20 B Ground —— 0
21 O/L Ignition switch ON or
START ON
— Battery voltage
23 W/L Washer fluid level switch ON Washer fluid level low
0
Washer fluid level normal Battery voltage
24 O/B Seat belt buckle switch
LH ONUnfastened (ON)
0
Fastened (OFF) Battery voltage
25 P/L Seat belt buckle switch
RH ONUnfastened (ON)
0
Fastened (OFF) Battery voltage
31 G Parking brake switch ON Parking brake applied
0
Parking brake released Battery voltage
32 P/B Brake fluid level switch ON Brake fluid level low
0
Brake fluid level normal Battery voltage
35 G/O Security indicator input OFF Security indicator ON
0
Security indicator OFF Battery voltage
Revision: April 20092010 QX56

WCS-48
< ECU DIAGNOSIS >
COMBINATION METER
DTC Index
INFOID:0000000005382411
NOTE:
Function Specifications
Speedometer
Zero indication.
Tachometer
Fuel gauge
Engine coolant temperature gauge
Engine oil pressure gauge
Voltage gauge
Illumination control
Meter illumination Change to nighttime mode when communication is lost.
Segment LCD Odometer
Freeze current indication.
A/T position Display turns off.
Buzzer Buzzer turns off.
Warning lamp/indicator lamp ABS warning lamp
Lamp turns on when communication is lost.
Brake warning lamp
VDC OFF indicator lamp
SLIP indicator lamp
A/T CHECK warning lamp
Lamp turns off when communication is lost.
Oil pressure/coolant temperature
warning lamp
Light indicator
Malfunction indicator lamp
Master warning lamp
Air bag warning lamp
High beam indicator
Turn signal indicator lamp
CRUISE indicator lamp
Driver and passenger seat belt warn-
ing lamp
Lamp turns off when disconnected.
Charge warning lamp
Security indicator lamp
4WD indicator lamp
AT P i n d i c a t o r l a m p
CK SUSP warning lamp
Low tire pressure warning lamp
Lamp will flash every second for 1 minute and then stay on con-
tinuously thereafter.
CONSULT-III display
MalfunctionReference
page
CAN COMM CIRC
[U1000] Malfunction is detected in CAN communication.
CAUTION:
Even when there is no malfunction on CAN communication system, malfunction may be
misinterpreted when battery has low voltage (when maintaining 7 - 8 V for about 2 sec-
onds) or 10A fuse [No. 3, located in
the fuse block (J/B)] is disconnected. MWI-26
VEHICLE SPEED
CIRC
[B2205]Malfunction is detected when an erroneous speed signal is input.
CAUTION:
Even when there is no malfunction on speed signal system, malfunction may be misin-
terpreted when battery has lo
w voltage (when maintaining 7 - 8 V for about 2 seconds). MWI-27
Revision: April 20092010 QX56

WCS-50
< ECU DIAGNOSIS >
BCM (BODY CONTROL MODULE)
BCM (BODY CONTROL MODULE)
Reference ValueINFOID:0000000005382423
VALUES ON THE DIAGNOSIS TOOL
Monitor ItemCondition Value/Status
AIR COND SW A/C switch OFF
OFF
A/C switch ON ON
AUT LIGHT SYS Outside of the room is dark
OFF
Outside of the room is bright ON
AUTO LIGHT SW Lighting switch OFF
OFF
Lighting switch AUTO ON
BACK DOOR SW Back door closed
OFF
Back door opened ON
CARGO LAMP SW Cargo lamp switch OFF
OFF
Cargo lamp switch ON ON
CDL LOCK SW Door lock/unlock switch does not operate
OFF
Press door lock/unlock switch to the LOCK side ON
CDL UNLOCK SW Door lock/unlock switch does not operate
OFF
Press door lock/unlock switch to the UNLOCK side ON
DOOR SW-AS Front door RH closed
OFF
Front door RH opened ON
DOOR SW-DR Front door LH closed
OFF
Front door LH opened ON
DOOR SW-RL Rear door LH closed
OFF
Rear door LH opened ON
DOOR SW-RR Rear door RH closed
OFF
Rear door RH opened ON
ENGINE RUN Engine stopped
OFF
Engine running ON
FR FOG SW Front fog lamp switch OFF
OFF
Front fog lamp switch ON ON
FR WASHER SW Front washer switch OFF
OFF
Front washer switch ON ON
FR WIPER LOW Front wiper switch OFF
OFF
Front wiper switch LO ON
FR WIPER HI Front wiper switch OFF
OFF
Front wiper switch HI ON
FR WIPER INT Front wiper switch OFF
OFF
Front wiper switch INT ON
FR WIPER STOP Any position other than front wiper stop position
OFF
Front wiper stop position ON
HAZARD SW When hazard switch is not pressed
OFF
When hazard switch is pressed ON
Revision: April 20092010 QX56

WCS-66
< SYMPTOM DIAGNOSIS >
THE LIGHT REMINDER WARNING DOES NOT SOUND
SYMPTOM DIAGNOSIS
THE LIGHT REMINDER WARNING DOES NOT SOUND
DescriptionINFOID:0000000005146175
Light reminder warning does not sound even though headlamp is illuminated.
Diagnosis ProcedureINFOID:0000000005146176
1.CHECK COMBINATION SWITCH (LIGHTING SWITCH) OPERATION
Check that the headlamps operate normally by operat ing the combination switch (lighting switch).
Do they operate normally?
YES >> GO TO 2
NO >> Refer to EXL-4, "
Work Flow".
2.CHECK FRONT DOOR SWITCH LH SIGNAL CIRCUIT
Perform inspection of the front door s witch LH signal circuit. Refer to DLK-71, "
Diagnosis Procedure".
Is the inspection result normal?
YES >> GO TO 3
NO >> Repair harness or connector.
3.CHECK FRONT DOOR SWITCH LH
Perform a unit inspection for the front door switch LH. Refer to DLK-71, "
Diagnosis Procedure".
Is the inspection result normal?
YES >> Replace the BCM. Refer to BCS-59, "Removal and Installation".
NO >> Replace the front door switch LH.
Revision: April 20092010 QX56

WCS
THE SEAT BELT WARNING CONTINUES SOUNDING, OR DOES NOT SOUND
WCS-67
< SYMPTOM DIAGNOSIS >
C
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THE SEAT BELT WARNING CONTIN UES SOUNDING, OR DOES NOT
SOUND
DescriptionINFOID:0000000005146177
• Seat belt warning does not sound even though driver seat belt is not fastened.
• Seat belt warning sounds even though driver seat belt is fastened.
Diagnosis ProcedureINFOID:0000000005146178
1.CHECK WARNING CHIME OPERATION
1. With key removed from key switch and the front door LH open, turn lighting switch to 1st or 2nd position.
2. Return lighting switch to off position, and insert key into key switch.
Does warning chime sound for both steps?
YES >> GO TO 2
NO >> Replace combination meter. Refer to MWI-100, "
Removal and Installation".
2.CHECK SEAT BELT WARNING LAMP
1. Turn ignition switch ON.
2. Check the operation of the seat belt warning lamp in the combination meter.
Is the inspection result normal?
YES >> Replace BCM. Refer to BCS-59, "Removal and Installation".
NO >> GO TO 3
3.CHECK SEAT BELT BUCKLE SWITCH CIRCUIT
Perform inspection of the seat belt buckle switch circuit. Refer to WCS-19, "
DiagnosisProcedure".
Is the inspection result normal?
YES >> GO TO 4
NO >> Repair harness or connector.
4.CHECK SEAT BELT BUCKLE SWITCH UNIT
Perform a unit inspection for the seat belt buckle switch. Refer to WCS-20, "
Component Inspection".
Is the inspection result normal?
YES >> Replace the combination meter. Refer to MWI-100, "Removal and Installation".
NO >> Replace the seat belt buckle pre-tensioner assembly LH (seat belt buckle switch). Seat belt fastened : OFF
Seat belt not fastened : ON
Revision: April 20092010 QX56

WCS-68
< SYMPTOM DIAGNOSIS >
THE KEY WARNING DOES NOT SOUND
THE KEY WARNING DOES NOT SOUND
DescriptionINFOID:0000000005146179
Key warning does not sound even though key is in ignition and front door LH is opened.
Diagnosis ProcedureINFOID:0000000005146180
1.CHECK WARNING CHIME OPERATION
With key removed from the ignition and the front door LH open, turn the lighting switch to 1st or 2nd position.
Does warning chime sound?
YES >> GO TO 2
NO >> Replace combination meter. Refer to MWI-100, "
Removal and Installation".
2.CHECK KEY SWITCH CIRCUIT
Perform inspection of the key switch circuit. Refer to WCS-21, "
DiagnosisProcedure".
Is the inspection result normal?
YES >> GO TO 3
NO >> Repair harness or connector.
3.CHECK KEY SWITCH
Perform a unit inspection for the key switch. Refer to WCS-22, "
Component Inspection".
Is the inspection result normal?
YES >> Replace the BCM. Refer to BCS-59, "Removal and Installation".
NO >> Replace the key switch and ignition knob switch.
Revision: April 20092010 QX56