relay INFINITI QX56 2011 Factory Service Manual

SYSTEMEXL-11
< SYSTEM DESCRIPTION > [XENON TYPE]
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*: With daytime running light system
AUTO LIGHT SYSTEM
AUTO LIGHT SYSTEM : System DiagramINFOID:0000000006213897
AUTO LIGHT SYSTEM : System Description (For CANADA)INFOID:0000000006218912
OUTLINE
 Auto light system is controlled by each function of BCM and IPDM E/R.
Control by BCM- Combination switch reading function
- Headlamp control function
- Auto light function
- Delay timer function
- Wiper linked auto lighting function
- Auto light adjustment system
Control by IPDM E/R
- Relay control function
 Auto light system has the auto light function, wiper linked auto lighting function and delay timer function.
- Auto light function automatically turns ON/OFF the exterior lamps* and each illumination automatically,
depending on the outside brightness.
- Wiper linked auto lighting function automatically tu rns ON/OFF the exterior lamps* and each illumination
when the light switch is in the AUTO posit ion, according to a front wiper operation.
- When auto light system turns the exterior lamps ON wit h the ignition switch OFF, delay timer function turns
the exterior lamps OFF, depending on the vehicle condition with the auto light function after a certain period
of time.
*: Headlamp (LO/HI), parking lamp, side marker lamp, tail lamp and front fog lamp (Headlamp HI and front fog
lamp depend on the combination switch condition.)
AUTO LIGHT FUNCTION
 BCM detects the combination switch conditi on with the combination switch reading function.
 BCM supplies voltage to optical sensor when the ignition switch is turned ON or ACC.
 Optical sensor converts outside brightness (lux) to voltage and transmits the optical sensor signal to BCM.
 BCM judges outside brightness from the optical sens or signal and judges ON/OFF condition of the exterior
lamp and each illumination according to the outside brightness.
Control part Fail-safe operation
Headlamp  Turns ON the headlamp low relay when the ignition switch is turned ON
 Turns OFF the headlamp low relay when the ignition switch is turned OFF
 Headlamp high relay OFF
JMLIA1254GB
Revision: 2010 May2011 QX56

EXL-12
< SYSTEM DESCRIPTION >[XENON TYPE]
SYSTEM
 BCM transmits each request signal to IPDM E/R wit
h CAN communication according to ON/OFF condition
by the auto light function.
NOTE:
ON/OFF timing differs based on the sensit ivity from the setting. The setting can be set by CONSULT-III. Refer
to EXL-23, "
HEADLAMP : CONSULT-III Function (BCM - HEAD LAMP)".
AUTO LIGHT ADJUSTMENT SYSTEM
The auto light adjustment system automatically, dims/bri ghtens the display and combination meter, according
to brightness outside the vehicle, when lighting switch 1ST or lighting switch 2ND is operated. Refer to INL-11,
"AUTO LIGHT ADJUSTMENT SYSTEM : System Description".
DELAY TIMER FUNCTION
BCM turns the exterior lamp OFF depending on the vehicle condition with the auto light function when the igni-
tion switch is turned OFF.
 Turns the exterior lamp OFF 5 minutes afte r detecting that any door opens. (Door switch ON).
 Turns the exterior lamp OFF a certain period of time* after closing all doors. (Door switch ON →OFF).
 Turns the exterior lamp OFF with the igni tion switch ACC or the light switch OFF.
*: The preset time is 45 seconds. The timer operat ing time can be set by CONSULT-III. Refer to EXL-23,
"HEADLAMP : CONSULT-III Function (BCM - HEAD LAMP)".
NOTE:
When any position other than the light switch AUTO is set, the auto light system function switches to the exte-
rior lamp battery saver function.
AUTO LIGHT SYSTEM : System De scription (Except for CANADA)INFOID:0000000006218908
OUTLINE
 Auto light system is controlled by each function of BCM and IPDM E/R.
Control by BCM- Combination switch reading function
- Headlamp control function
- Auto light function
- Delay timer function
- Wiper linked auto lighting function
- Auto light adjustment system
Control by IPDM E/R- Relay control function
 Auto light system has the auto light function (with twilight lighting function), wiper linked auto lighting function
and delay timer function.
- Auto light function automatically turns ON/OFF the exterior lamps* and each illumination automatically,
depending on the outside brightness.
- Wiper linked auto lighting function automatically turn s ON/OFF the exterior lamps* and each illumination
when the light switch is in the AUTO posit ion, according to a front wiper operation.
- When auto light system turns the exterior lamps ON with the ignition switch OFF, delay timer function turns the exterior lamps OFF, depending on the vehicle conditi on with the auto light function after a certain period
of time.
*: Headlamp (LO/HI), parking lamp, side marker lamp, tail lamp and front fog lamp (Headlamp HI and front fog
lamp depend on the combination switch condition.)
NOTE:
The settings of the twilight lighting function and the wiper linked auto lighting function can be changed with
CONSULT-III. Refer to EXL-23, "
HEADLAMP : CONSULT-III Function (BCM - HEAD LAMP)".
AUTO LIGHT FUNCTION (WITH TWILIGHT LIGHTING FUNCTION)
Description
 BCM detects the combination switch conditi on with the combination switch reading function.
 BCM supplies voltage to the optical sensor when the ignition switch is turned ON or ACC.
 Optical sensor converts outside brightness (lux) to voltage and transmits the optical sensor signal to BCM.
 When ignition switch is turned ON, BCM detects out side brightness from the optical sensor signal and
judges ON/OFF condition of the exterior lamp and each illumination, depending on the outside brightness
condition (standard or twilight).
Revision: 2010 May2011 QX56

EXL-14
< SYSTEM DESCRIPTION >[XENON TYPE]
SYSTEM
AUTO LIGHT ADJUSTMENT SYSTEM
The auto light adjustment system automatically, dims/bri
ghtens the display and combination meter, according
to brightness outside the vehicle, when lighting switch 1ST or lighting switch 2ND is operated. Refer to INL-11,
"AUTO LIGHT ADJUSTMENT SYSTEM : System Description".
DELAY TIMER FUNCTION
BCM turns the exterior lamp OFF depending on the vehicle condition with the auto light function when the igni-
tion switch is turned OFF.
 Turns the exterior lamp OFF 5 minutes afte r detecting that any door opens. (Door switch ON).
 Turns the exterior lamp OFF a certain period of time* after closing all doors. (Door switch ON →OFF).
 Turns the exterior lamp OFF with the igni tion switch ACC or the light switch OFF.
*: The preset time is 45 seconds. The timer operat ing time can be set by CONSULT-III. Refer to EXL-23,
"HEADLAMP : CONSULT-III Function (BCM - HEAD LAMP)".
NOTE:
When any position other than the light switch AUTO is set, the auto light system function switches to the exte-
rior lamp battery saver function.
DAYTIME RUNNING LIGHT SYSTEM
DAYTIME RUNNING LIGHT S YSTEM : System DiagramINFOID:0000000006214028
DAYTIME RUNNING LIGHT SYSTEM : System DescriptionINFOID:0000000006214029
OUTLINE
 Turns the front fog lamp ON as the daytime running light.
 Daytime running light is controlled by daytime runni ng light control function and combination switch reading
function of BCM, and relay c ontrol function of IPDM E/R.
DAYTIME RUNNING LIGHT OPERATION
 BCM detects the combination switch conditi on by the combination switch reading function.
 BCM detects the vehicle condition depending on the following signals.
- Parking brake switch signal (received from combination meter via CAN communication)
 BCM transmits the front fog light request signal to IPDM E/R via CAN communication according to the day-
time running light ON condition.
Daytime running light ON condition- While the engine running with the parking brake released
- Lighting switch OFF
- Lighting switch AUTO (auto light function OFF judgment)
- Passing switch OFF
- Front fog lamp switch OFF
 IPDM E/R turns the integrated front fog lamp relay ON and turns the front fog lamp ON according to the front
fog light request signal.
ACTIVE ADAPTIVE FRONT-LIGHTING SYSTEM
JMLIA1078GB
Revision: 2010 May2011 QX56

SYSTEMEXL-19
< SYSTEM DESCRIPTION > [XENON TYPE]
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agramINFOID:0000000006213903
PARKING, LICENSE PLATE, SIDE MARKER AND TAIL LAMP SYSTEM : System De-
scription
INFOID:0000000006213904
OUTLINE
Parking, license plate, side marker and tail lamps ar e controlled by combination switch reading function and
headlamp control function of BCM, and re lay control function of IPDM E/R.
PARKING, LICENSE PLATE, SIDE MARKER AND TAIL LAMPS OPERATION
 BCM detects the combination switch conditi on by the combination switch reading function.
 BCM transmits the position light request signal to IPDM E/R and the combination meter via CAN communi-
cation according to the ON/OFF condition of the pa rking, license plate, side marker and tail lamps.
Parking, license plate, side marker and tail lamps 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 and tu rns the parking, license plate, side marker and tail
lamps ON according to the position light request signal.
 Combination meter turns the tail lamp indicator lamp ON according to the position light request signal.
PARKING, LICENSE PLATE, SIDE MARKER AND TAIL LAMP SYSTEM : Fail-safe
INFOID:0000000006213905
CAN COMMUNICATION CONTROL
When CAN communication with BCM is impossible, IPDM E/R performs fail-safe control. After CAN communi-
cation recovers normally, it also returns to normal control.
If No CAN Communication Is Available With BCM
*: With daytime running light system
FRONT FOG LAMP SYSTEM
JMLIA0687GB
Control part Fail-safe operation
Parking lamps
 License plate lamps
 Illuminations
 Tail lamps  Turns ON the tail lamp relay and daytime running light relay
* when the ignition switch
is turned ON
 Turns OFF the tail lamp relay and daytime running light relay
* when the ignition switch
is turned OFF
Revision: 2010 May2011 QX56

EXL-20
< SYSTEM DESCRIPTION >[XENON TYPE]
SYSTEM
FRONT FOG LAMP SYSTEM : System Diagram
INFOID:0000000006213906
FRONT FOG LAMP SYSTEM : System DescriptionINFOID:0000000006213907
OUTLINE
Front fog lamp is controlled by combination switch r eading function and front fog lamp control function of BCM,
and relay control function of IPDM E/R.
FRONT FOG LAMP OPERATION
 BCM detects the combination switch conditi on by the combination switch reading function.
 BCM transmits the front fog lights request signal to IPDM E/R via CAN communication according to the front
fog lamp ON condition.
Front fog lamp ON condition- Front fog lamp switch ON and any of the followings. (except for the high beam ON)
 Lighting switch 2ND
 Lighting switch AUTO (auto light function ON judgment)
IPDM E/R turns the integrated front fog lamp relay ON, and turns the front fog lamp ON according to the front
fog lights request signal.
FRONT FOG LAMP SYSTEM : Fail-SafeINFOID:0000000006422123
CAN COMMUNICATION CONTROL
When CAN communication with ECM and BCM is impossible, IPDM E/R performs fail-safe control. After CAN
communication recovers normally, it also returns to normal control.
If No CAN Communication Is Available With BCM
EXTERIOR LAMP BATTERY SAVER SYSTEM
EXTERIOR LAMP BATTERY SAVE R SYSTEM : System DiagramINFOID:0000000006213908
JMLIA1154GB
Control part Fail-safe operation
Front fog lamp Front fog lamp relay OFF
JPLIA1037GB
Revision: 2010 May2011 QX56

SYSTEMEXL-21
< SYSTEM DESCRIPTION > [XENON TYPE]
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EXTERIOR LAMP BATTERY SAVE R SYSTEM : System DescriptionINFOID:0000000006213909
OUTLINE
 Exterior lamp battery saver system is c ontrolled by each function of BCM and IPDM E/R.
Control by BCM
- Combination switch reading function
- Headlamp control function
- Exterior lamp battery saver function
Control by IPDM E/R
- Relay control function
 BCM turns the exterior lamp* OFF after a period of ti me to prevent the battery from over-discharge when the
ignition switch is turned OFF with the exterior lamp ON.
*: Headlamp (LO/HI), parking lamp, tail lamp, side marker lamp, license plate lamp and front fog lamp
EXTERIOR LAMP BATTERY SAVER ACTIVATION
BCM activates the timer and turns the exterior lamp OFF 5 minutes after the ignition switch is turned from ON
→ OFF with the exterior lamps ON.
NOTE:
 Headlamp control function turns the exterior lamps ON normally when the ignition switch is turned ACC or
the engine started (both before and after the exte rior lamp battery saver is turned OFF).
 The timer starts at the time that the lighting switch is turned from OFF → 1ST or 2ND with the exterior lamp
OFF.
Revision: 2010 May2011 QX56

DIAGNOSIS SYSTEM (IPDM E/R)EXL-29
< SYSTEM DESCRIPTION > [XENON TYPE]
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CONSULT-III Function (IPDM E/R)INFOID:0000000006368067
APPLICATION ITEM
CONSULT-III performs the following functi ons via CAN communication with IPDM E/R.
SELF DIAGNOSTIC RESULT
Refer to PCS-22, "DTCIndex".
DATA MONITOR
Monitor item
Oil pressure warning lamp does not operate Perform auto active test.
Does the oil pressure warning
lamp blink?YES
 Harness or connector be-
tween IPDM E/R and oil
pressure switch
 Oil pressure switch
 IPDM E/R
NO  CAN communication signal
between IPDM E/R and
BCM
 CAN communication signal
between BCM and combi-
nation meter
 Combination meter
Symptom Inspection contents Possible cause
Diagnosis mode Description
Ecu Identification Allows confirmation of IPDM E/R part number.
Self Diagnostic Result Displays the diagnosis results judged by IPDM E/R.
Data Monitor Displays the real-time input/output data from IPDM E/R input/output data.
Active Test IPDM E/R can provide a drive signal to electronic components to check their operations.
CAN Diag Support Monitor The results of transmit/receive diagnosis of CAN communication can be read.
Monitor Item [Unit] MAIN SIG-
NALS Description
RAD FAN REQ
[1/2/3/4] ×Displays the value of the cooling fan speed request signal received from ECM via
CAN communication.
AC COMP REQ
[Off/On] ×Displays the status of the A/C compressor request signal received from ECM via
CAN communication.
TAIL&CLR REQ
[Off/On] ×
Displays the status of the position light request signal received from BCM via CAN
communication.
HL LO REQ
[Off/On] ×Displays the status of the low beam request signal received from BCM via CAN
communication.
HL HI REQ
[Off/On] ×Displays the status of the high beam request signal received from BCM via CAN
communication.
FR FOG REQ
[Off/On] ×Displays the status of the front fog light request signal received from BCM via
CAN communication.
FR WIP REQ
[Stop/1LOW/Low/Hi] ×
Displays the status of the front wiper request signal received from BCM via CAN
communication.
WIP AUTO STOP
[STOP P/ACT P] ×
Displays the status of the front wiper auto stop signal judged by IPDM E/R.
WIP PROT
[Off/BLOCK] ×
Displays the status of the front wiper fail-safe operation judged by IPDM E/R.
IGN RLY1 -REQ
[Off/On] Displays the status of the ignition switch ON signal received from BCM via CAN
communication.
IGN RLY
[Off/On] ×
Displays the status of the ignition relay judged by IPDM E/R.
Revision: 2010 May2011 QX56

EXL-30
< SYSTEM DESCRIPTION >[XENON TYPE]
DIAGNOSIS SYSTEM (IPDM E/R)
ACTIVE TEST
Te s t i t e m
PUSH SW
[Off/On]Displays the status of the push-button ignition switch judged by IPDM E/R.
INTER/NP SW
[Off/On] Displays the status of the shift position judged by IPDM E/R.
ST RLY CONT
[Off/On] Displays the status of the starter relay status signal received from BCM via CAN
communication.
IHBT RLY -REQ
[Off/On] Displays the status of the starter control relay signal received from BCM via CAN
communication.
ST/INHI RLY
[Off/ ST ON/INHI ON/UNKWN] Displays the status of the starter relay and starter control relay judged by IPDM
E/R.
DETENT SW
[Off/On] Displays the status of the A/T shift selector (detention switch) judged by IPDM E/
R.
S/L RLY -REQ
[Off/On] Displays the status of the steering lock relay signal received from BCM via CAN
communication.
S/L STATE
[LOCK/UNLK/UNKWN] Displays the status of the steering lock judged by IPDM E/R.
OIL P SW
[Open/Close] Displays the status of the oil pressure switch judged by IPDM E/R.
HOOD SW
[Off/On] Displays the status of the hood switch judged by IPDM E/R.
HL WASHER REQ
[Off/On] Displays the status of the headlamp washer request signal received from BCM via
CAN communication.
THFT HRN REQ
[Off/On] Displays the status of the theft warning horn request signal received from BCM
via CAN communication.
HORN CHIRP
[Off/On] Displays the status of the horn reminder signal received from BCM via CAN com-
munication.
Monitor Item
[Unit] MAIN SIG-
NALS Description
Test item Operation Description
CORNERING LAMP LH
NOTE:
This item is indicated, but cannot be tested.
RH
HORN On Operates horn relay for 20 ms.
REAR DEFOGGER Off OFF
On Operates the rear window defogger relay.
FRONT WIPER Off OFF
Lo Operates the front wiper relay.
Hi Operates the front wiper relay and front wiper high relay.
MOTOR FAN* 1OFF
2 Transmits 50% pulse duty signal (PWM signal) to the cooling fan control module.
3 Transmits 75% pulse duty signal (PWM signal) to the cooling fan control module.
4
Transmits 100% pulse duty signal (PWM signal) to the cooling fan control mod-
ule.
HEAD LAMP WASHER On Operates the headlamp washer relay for 1 second.
Revision: 2010 May2011 QX56

DIAGNOSIS SYSTEM (IPDM E/R)EXL-31
< SYSTEM DESCRIPTION > [XENON TYPE]
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*: Operates while the engine is running. EXTERNAL LAMPS
Off OFF
TAIL Operates the tail lamp relay.
Lo Operates the headlamp low relay.
Hi
Operates the headlamp low relay and ON/OFF the headlamp high relay at 1 sec-
ond intervals.
Fog Operates the front fog lamp relay.
Test item Operation Description
Revision: 2010 May2011 QX56

PARKING, LICENSE PLATE, SIDE MARKER AND TAIL LAMPS ARE NOT TURNED ON
EXL-119
< SYMPTOM DIAGNOSIS > [XENON TYPE]
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PARKING, LICENSE PLATE, SIDE MARKER AND TAIL LAMPS ARE NOT
TURNED ON
DescriptionINFOID:0000000006213986
The parking, license plate, tail lamps and side marker are not turned ON in any condition.
Diagnosis ProcedureINFOID:0000000006213987
1.CHECK FUSE
Check that the following fuse is fusing.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair the applicable circuit. And then replace the fuse.
2.COMBINATION SWITCH INSPECTION
Check combination switch. Refer to BCS-80, "
Symptom Table".
Is the combination switch normal?
YES >> GO TO 3.
NO >> Repair or replace the malfunctioning part.
3.CHECK TAIL LAMP RELAY REQUEST SIGNAL INPUT
CONSULT-III DATA MONITOR
1. Select “TAIL & CLR REQ” of IPDM E/R data monitor item.
2. With operating the lighting switch, check the monitor status.
Is the inspection result normal?
YES >> Replace IPDM E/R.
NO >> Replace BCM. Refer to BCS-81, "
Removal and Installation".
Location Fuse No. Capacity
IPDM E/R #46 10 A
#47 10 A
Monitor item Condition Monitor status
TAIL & CLR REQ Lighting switch 1ST On
OFF Off
Revision: 2010 May2011 QX56