2011 INFINITI QX56 relay

HAC-130
< DTC/CIRCUIT DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
REAR A/C SOLENOID VALVE
2. Check continuity between the r
ear A/C relay terminal 3 and 5
when the voltage is supplied between terminal 1 and 2.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace rear A/C relay.
Blower relay Voltage Continuity
Te r m i n a l
35 ON Existed
OFF Not existed
JSIIA1551ZZ
Revision: 2010 May2011 QX56

HAC-134
< SYMPTOM DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
FRONT AUTOMATIC AIR CONDITIONING SYSTEM
Compressor does not operate. Circuit between magnet clutch and
IPDM E/R
 Magnet clutch
 IPDM E/R (A/C relay)
 Circuit between ECM and refriger- ant pressure sensor
 Refrigerant pressure sensor
 CAN communication circuit
 A/C auto amp. HAC-142, "Diagnosis Procedure"
 Insufficient cooling.
 No cool air comes out. (Air flow volume is normal.)
 Magnet clutch control system
 Drive belt slipping
 Refrigerant cycle
 Air leakage from each duct
 A/C auto amp. connection recogni-
tion signal circuit
 Temperature settin g trimmer (front)HAC-138, "FRONT AIR CONDI-
TIONER : Diagnosis Procedure"
 Insufficient heating.
 No warm air comes out. (Air flow volume is nor-
mal.)  Engine cooling system
 Heater hose
 Heater core
 Air leakage from each duct
 Temperature settin
g trimmer (front)HAC-140, "FRONT AIR CONDI-
TIONER : Diagnosis Procedure"
Noise is heard when front
air conditioning system op-
erates. During compressor
operation
Refrigerant cycle
HA-27, "
Symptom Table"
During front blower
motor operation Mixing any foreign object in front
blower motor
 Front blower motor fan breakage
 Front blower motor rotation inferiori- ty HAC-122, "Component Inspection
(Front Blower Motor)"
 Memory function does not operate.
 Setting temperature is not memorized.
 Battery power supply system of A/C
auto amp.
 A/C auto amp. HAC-110, "A/C AUTO AMP. : Diag-
nosis Procedure"
Symptom Corresponding malfunction part Reference
Revision: 2010 May2011 QX56

REAR AUTOMATIC AIR CONDITIONING SYSTEMHAC-135
< SYMPTOM DIAGNOSIS > [AUTOMATIC AIR CONDITIONING]
C
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M A
B
HAC
N
O P
REAR AUTOMATIC AIR CONDITIONING SYSTEM
Diagnosis Chart By SymptomINFOID:0000000006275981
NOTE:
 Perform the self-diagnoses with CONSULT-III before performing the symptom diagnosis. If DTC is detected,
perform the corresponding diagnosis.
 The following table is based on the condition that fr ont automatic air conditioning system operates normally.
Symptom Corresponding malfunction part Reference
 Rear air conditioning system cannot be controlled. (Front A/C control)
 Operation status of rear air conditioning system is not indicated on front display. Multi AV system
AV- 1 9 9 , "
Symptom Table"
Rear air conditioning sys-
tem cannot be controlled.
(Rear A/C control)Operation status of
rear air conditioning
system is not indicated
on rear A/C control
display
 Power supply system of rear A/C
control
 Rear A/C control HAC-115, "
REAR A/C CONTROL :
Diagnosis Procedure"
Operation status of
rear air conditioning
system is indicated on
rear A/C control dis-
play Communication circuit between rear
A/C control and A/C auto amp.
 A/C auto amp. HAC-127, "
Diagnosis Procedure"
 Air outlet does not change.
 Rear mode door motor does not operate normally.  Circuit between rear mode door mo-
tor and A/C auto amp.
 Rear mode door motor control link- age
 Front mode door motor
 A/C auto amp. HAC-116, "REAR MODE DOOR
MOTOR : Diagnosis Procedure"
 Discharge air temperature does not change.
 Rear air mix door motor does not operate normally.  Circuit between rear air mix door
motor and A/C auto amp.
 Rear air mix door motor installation condition
 Rear air mix door motor
 A/C auto amp. HAC-114, "REAR AIR MIX DOOR
MOTOR : Diagnosis Procedure"
Rear blower motor operation is malfunctioning.
 Power supply system of rear blower
motor
 Circuit between rear blower motor
and A/C auto amp..
 Rear blower motor
 A/C auto amp. HAC-131, "Diagnosis Procedure"
 Insufficient cooling.
 No cool air comes out. (Air flow volume is normal.)  Power supply system of rear A/C re-
lay
 Circuit between rear A/C relay and A/C auto amp..
 Circuit between rear A/C relay and rear A/C solenoid valve.
 Circuit between rear A/C solenoid
valve and ground.
 Rear A/C relay
 Rear A/C solenoid valve
 A/C auto amp.
 Refrigerant cycle
 Air leakage from each duct
 Temperature setti ng trimmer (rear) HAC-139, "REAR AIR CONDI-
TIONER : Diagnosis Procedure"
Revision: 2010 May2011 QX56

INL-4
< SYSTEM DESCRIPTION >
COMPONENT PARTS
SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts LocationINFOID:0000000006216048
Component DescriptionINFOID:0000000006216049
1. BCMRefer to BCS-4, "
BODY CONTROL
SYSTEM : Componen t Parts Loca-
tion"
2. Personal lamp 3. Luggage room lamp
4. Remote keyless entry receiver Refer to DLK-11, "
DOOR LOCK
SYSTEM :
ComponentPartsLocation"
5. Back door lock assembly
(back door switch) 6. Automatic back door close switch
7. Door request switch 8. Door switch 9. Step lamp
10. Paddle lamp 11. Optical sensor 12. IPDM E/R Refer to PCS-4, "
Component Parts
Location"
13. Vanity mirror lamp 14. Combination meter 15. Combination switch
16. Front door lock assembly (driver
side) (door key cylinder switch, un-
lock sensor) 17. Door lock and unlock switch 18. Foot lamp
19. Push-button ignition switch 20. AV control unit Refer to AV- 9 , "
Component Parts Lo-
cation"
21. Map lamp
JMLIA0837ZZ
Part Description
BCM Controls the interior lighting system.
IPDM E/R Controls the integrated relay according to the request signal from BCM (via CAN com-
munication).
Remote keyless entry receiver Refer to DLK-12, "
DOOR LOCK SYSTEM : ComponentDescription".
AV control uni Receives the dimmer signal from BCM via CAN communication.
Optical sensor Refer to EXL-7, "
EXTERIOR LIGHTING SYSTEM : ComponentDescription".
Unlock sensor Detects door lock condition of driver side door.
Revision: 2010 May2011 QX56

INL-10
< SYSTEM DESCRIPTION >
SYSTEM
Each function of interior room lamp battery saver can be set by CONSULT-III. Refer to INL-15, "BATTERY
SAVER : CONSULT-III Function (BCM - BATTERY SAVER)".
ILLUMINATION CONTROL SYSTEM
ILLUMINATION CONTROL SYSTEM : System DiagramINFOID:0000000006216054
ILLUMINATION CONTROL SYS TEM : System DescriptionINFOID:0000000006216055
OUTLINE
Each illumination lamp is controlled by each function of BCM, IPDM E/R and combination meter.
Control by BCM Combination switch reading function
 Headlamp control function
Control by IPDM E/R Relay control function
Control by combination meter Meter illumination control function (Refer to MWI-16, "METER ILLUMINATION CONTROL : System Descrip-
tion".)
ILLUMINATION CONTROL
 BCM detects the combination switch conditi on by the combination switch reading function.
 BCM transmits position light request signal to IPDM E/R and combination meter according to tail lamp ON
condition.
Tail lamp ON condition- Lighting switch 1ST
- Lighting switch 2ND
- Lighting switch AUTO, and the auto light function ON judgment
- Lighting switch AUTO, with the front fog lamp switch ON and the ignition switch ON
 IPDM E/R turns the integrated tail lamp relay ON acco rding to position light request signal. It provides the
power supply to each illumination lamp.
 Combination meter enters in the nighttime mode accord ing to position light request signal. Under the night-
time mode the combination meter controls the illu minance by controlling each illumination lamp (ground
side).
AUTO LIGHT ADJUSTMENT SYSTEM
JPLIA0855GB
Revision: 2010 May2011 QX56

LAN
SYSTEMLAN-31
< SYSTEM DESCRIPTION > [CAN]
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N
Meter display signal
TR
RT
Oil pressure switch signal TR
RT
Position light request signal T R R
Rear fog light status signal T R
Rear window defogger con-
trol signal TR
RT
Sleep wake up signal T R R R R R R
Starter control relay signal T R
Starter relay status signal TRR
RT
Starting mode signal T R
Steering lock relay signal TRR
RT
Theft warning horn request
signal TR
Turn indicator signal R T R R
A/C display signal R T
A/C ON signal R T
Ambient temperature signal T R
Blower fan ON signal R T
Distance to empty signal R T
Fuel level low warning sig-
nal RT
Fuel level sensor signal R T
Manual mode shift down
signal RT
Manual mode shift up sig-
nal RT
Manual mode signal R T
Non-manual mode signal R T
Odometer signal R T
Parking brake switch signal R R T R R
Sleep-ready signal RT
RT
RT
Tow mode switch signal R T
Wake up signal RT
RT
Steering angle sensor mal-
function signal RR T R R
Steering angle sensor sig-
nal RR RR T R R
Steering angle speed signal R T R R Signal name
ECM
4WD
ABS
TCM
A-BAG AFS
AV
BCM
CGW
HVAC M&A
STRG
TPMS
IPDM-E
ADPPSB
E-SUS ICC
PWBD
Revision: 2010 May2011 QX56

LAN-32
< SYSTEM DESCRIPTION >[CAN]
SYSTEM
Steering calibration signal R T R
Hazard request signalRT
RT
Horn request signal R T
Low tire pressure warning
lamp signal RT
Tire pressure data signal R T
A/C compresso r feedback
signal RRT
Detention switch signal R T R
Engine restart control sig-
nal RT
Front wiper stop position
signal RT
High beam status signal R T
Hood switch signal R T
Low beam status signal R R T
Push-button ignition switch
status signal RT
Starter control relay signal R T
Steering lock unit status
signal RT
CK SUSP indi cator lamp
signal RT
Brake fluid pressure control
signal R
T
BSW warning lamp signal R T
IBA OFF indicator lamp sig-
nal RT
IBA operation signal RT
ICC operation signal R T
ICC warning lamp signal R T
Lane departure warning
lamp signal RT
LDP ON indicator lamp sig-
nal RT
Target yaw moment signal R T
Signal name
ECM
4WD
ABS
TCM
A-BAG
AFSAV
BCM
CGW
HVAC
M&A
STRG
TPMS
IPDM-E ADP
PSB
E-SUS ICC
PWBD
Revision: 2010 May2011 QX56

MWI
COMPONENT PARTSMWI-7
< SYSTEM DESCRIPTION >
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METER SYSTEM : Com ponent DescriptionINFOID:0000000006221691
CLOCK
Unit Description
Combination meter Controls the following with the signals received from each unit via CAN communication and the sig-
nals from switches and sensors.
 Speedometer
 Tachometer
 Engine coolant temperature gauge
 Fuel gauge
 Engine oil pressure gauge
 Voltmeter
 Warning lamps
 Indicator lamps
 Meter illumination control
 Meter effect function
 Information display
Trip computer switch Transmits the following signals to the combination meter.
 Enter switch signal
 Select switch signal
Trip reset and illumination con-
trol switch Transmits the following signals to the combination meter.
 Trip reset switch signal
 Illumination control switch signal (+)
 Illumination control switch signal (
−)
ECM Transmits the following signals to the combination meter via CAN communication.
 Engine speed signal
 Engine coolant temperature signal
 Engine status signal
 Fuel consumption monitor signal
ABS actuator and electric unit
(control unit) Transmits the vehicle speed signal to the combination meter via CAN communication.
IPDM E/R Transmits the oil pressure switch signal to the BCM via CAN communication.
BCM Transmits the following signals to the combination meter via CAN communication.
 Oil pressure switch signal
 Position light request signal
 Dimmer signal
 Door switch signal
 Meter ring illumination request signal
 Starter relay status signal
TCM Transmits the shift position signal to the combination meter via CAN communication.
A/T shift selector Transmits the following signals to the combination meter.
 Manual mode signal
 Non-manual mode signal
 Manual mode shift up signal
 Manual mode shift down signal
Fuel level sensor unit Transmits the fuel level sensor signal to the combination meter.
Oil pressure switch Transmits the oil pressure switch signal to the IPDM E/R.
Ambient sensor Transmits the ambient sensor signal to the combination meter.
A/C auto amp. Transmits the A/C auto amp. connection recognition signal to the combination meter.
Parking brake switch Transmits the parking brake switch signal to the combination meter.
Washer level switch Transmits the washer level switch signal to the combination meter.
Revision: 2010 May2011 QX56