2011 INFINITI QX56 battery

PCS
SYSTEMPCS-37
< SYSTEM DESCRIPTION > [POWER DISTRIBUTION SYSTEM]
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SYSTEM
POWER DISTRIBUTION SYSTEM
POWER DISTRIBUTION SYSTEM : System DiagramINFOID:0000000006220196
POWER DISTRIBUTION SYST
EM : System DescriptionINFOID:0000000006220197
SYSTEM DESCRIPTION
 PDS (POWER DISTRIBUTION SYSTEM) is the system that BCM controls with the operation of the push-
button ignition switch and performs the power distributi on to each power circuit. This system is used instead
of the mechanical power supply changing mechanism wit h the operation of the conventional key cylinder.
 The push-button ignition switch can be operated when Intelligent Key is in the following condition. Refer to Engine Start Function for details.
- Intelligent Key is in the detection area of the inside key antenna.
- Intelligent Key backside is contact ed to push-button ignition switch.
 The push-button ignition switch operation is input to BCM as a signal. BCM changes the power supply posi-
tion according to the status and operates the follo wing relays to supply power to each power circuit.
- Ignition relay (inside IPDM E/R)
- Ignition relay-1
- ACC relay
- Blower relay
NOTE:
The engine switch operation changes due to the conditions of brake pedal, selector lever and vehicle speed.
 The power supply position can be confirmed with the light ing of the indicators near the push-button ignition
switch.
BATTERY SAVER SYSTEM
When all the following conditions are met for 60 minutes, the battery saver system will cut off the power supply
to prevent battery discharge.
 The ignition switch is in the ACC position
 All doors are closed
 Selector lever is in the P position
Reset Condition of Battery Saver System
In order to prevent the battery from discharging, the battery saver system will cut off the power supply when all
doors are closed, the selector lever is on P position and t he ignition switch is left on ACC position for 1 hour. If
any of the following conditions are met the battery saver system is released and the steering will change auto-
matically to lock position from OFF position.
 Opening any door
 Operating with door request switch on door lock
 Operating with Intelligent Key on door lock
Press push-button ignition switch and ignition swit ch will change to ACC position from OFF position.
JMMIA0444GB
Revision: 2010 May2011 QX56

PCS
DIAGNOSIS SYSTEM (BCM)PCS-39
< SYSTEM DESCRIPTION > [POWER DISTRIBUTION SYSTEM]
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DIAGNOSIS SYSTEM (BCM)
COMMON ITEM
COMMON ITEM : CONSULT-III Fu
nction (BCM - COMMON ITEM)INFOID:0000000006376369
APPLICATION ITEM
CONSULT-III performs the following functions via CAN communication with BCM.
SYSTEM APPLICATION
BCM can perform the following functions for each system.
NOTE:
It can perform the diagnosis modes except the following for all sub system selection items.
×: Applicable item
*: This item is indicated, but not used.
FREEZE FRAME DATA (FFD)
The BCM records the following vehicle condition at the time a particular DTC is detected, and displays on
CONSULT-III.
Diagnosis mode Function Description
Work Support Changes the setting for each system function.
Self Diagnostic Result Displays the diagnosis results judged by BCM. Refer to BCS-57, "
DTCIndex".
CAN Diag Support Monitor Monitors the reception status of CAN communication viewed from BCM. Refer to CONSULT-III opera-
tion manual.
Data Monitor The BCM input/output signals are displayed.
Active Test The signals used to activate each device are forcibly supplied from BCM.
Ecu Identification The BCM part number is displayed.
Configuration  Read and save the vehicle specification.
 Write the vehicle specification when replacing BCM.
System Sub system selection item Diagnosis mode
Work Support Data Monitor Active Test
Door lock DOOR LOCK ×××
Rear window defo gger REAR DEFOGGER ××
Warning chime BUZZER ××
Interior room lamp timer INT LAMP ×××
Exterior lamp HEAD LAMP ×××
Wiper and washer WIPER ×××
Turn signal and hazard warning lamps FLASHER ×××
— AIR CONDITONER* ××
 Intelligent Key system
 Engine start system INTELLIGENT KEY
×××
Combination switch COMB SW ×
Body control system BCM ×
IVIS IMMU ×××
Interior room lamp battery saver BATTERY SAVER ×××
Back door TRUNK ×
Vehicle security system THEFT ALM ×××
RAP system RETAINED PWR ×
Signal buffer system SIGNAL BUFFER ××
Revision: 2010 May2011 QX56

PCS
DIAGNOSIS SYSTEM (BCM)PCS-41
< SYSTEM DESCRIPTION > [POWER DISTRIBUTION SYSTEM]
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ENGINE START BY I-KEY
Engine start function mode can be changed to operation with this mode
 On: Operate
 Off: Non-operation
TRUNK/GLASS HATCH OPEN Buzzer reminder function mode by back door opener switch can be changed to operation with
this mode
 On: Operate
 Off: Non-operation
PANIC ALARM SET Panic alarm button pressing time on Intelligent Key button can be selected from the following
with this mode
 MODE 1: 0.5 sec
 MODE 2: Non-operation
 MODE 3: 1.5 sec
TRUNK OPEN DELAY Back door open button pressing to Intelligent Key button can be selected as per the following
in this mode
 MODE 1: Press and hold
 MODE 2: Press twice
 MODE 3: Press and hold, or press twice
LO- BATT OF KEY FOB WARN Intelligent Key low battery warning mode can be changed to operation with this mode
 On: Operate
 Off: Non-operation
ANTI KEY LOCK IN FUNCTI Key reminder function mode can be changed to operation with this mode
 On: Operate
 Off: Non-operation
HAZARD ANSWER BACK Hazard reminder function mode by door request switch and Intelligent Key button can be se-
lected from the following with this mode
 Lock Only: Door lock operation only
 Unlock Only: Door unlock operation only
 Lock/Unlock: Lock and unlock operation
 Off: Non-operation
ANS BACK I-KEY LOCK Buzzer reminder function (lock operation) mode by door request switch can be selected from
the following with this mode
 Horn Chirp: Sound horn
 Buzzer: Sound Intelligent Key warning buzzer
 Off: Non-operation
ANS BACK I-KEY UNLOCK Buzzer reminder function (unlock operation) mode by door request switch can be changed to
operation with this mode
 On: Operate
 Off: Non-operation
SHORT CRANKING OUTPUT Starter motor can operate during the times below
 70 msec
100 msec
200 msec
CONFIRM KEY FOB ID It can be checked wh ether Intelligent Key ID code is registered or not in this mode
AUTO LOCK SET Auto door lock operation time can be changed in this mode
 MODE 1: OFF
 MODE 2: 30 sec
 MODE 3: 1 minute
 MODE 4: 2 minutes
 MODE 5: 3 minutes
 MODE 6: 4 minutes
 MODE 7: 5 minutes
HORN WITH KEYLESS LOCK Horn reminder function mode by Intelligent Key button can be selected from the following with
this mode
 On: Operate
 Off: Non-operation
Monitor item Description
Revision: 2010 May2011 QX56

PCS
DIAGNOSIS SYSTEM (BCM)PCS-43
< SYSTEM DESCRIPTION > [POWER DISTRIBUTION SYSTEM]
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*: OFF is displayed when brake pedal is depressed while brake switch power supply is OFF.
ACTIVE TEST
PRMT RKE STRT
NOTE:
This item is displayed, but cannot be monitored
TRNK/HAT MNTR NOTE:
This item is displayed, but cannot be monitored
RKE-LOCK Indicates [On/Off] condition of LOCK signal from Intelligent Key
RKE-UNLOCK Indicates [On/Off] condition of UNLOCK signal from Intelligent Key
RKE-TR/BD NOTE:
This item is displayed, but cannot be monitored
RKE-PANIC Indicates [On/Off] condition of PANIC button of Intelligent Key
RKE-MODE CHG Indicates [On/Off] condition of MODE CHANGE signal from Intelligent Key
RKE OPE COUN1 When remote keyless entry receiver receives the signal transmitted while operating on Intelli-
gent Key, the numerical value start changing
RKE OPE COUN2 NOTE:
This item is displayed, but cannot be monitored
Monitor Item Condition
Test item Description
BATTERY SAVER This test is able to check interior room lamp operation
 On: Operate
 Off: Non-operation
OUTSIDE BUZZER This test is able to check Intelligent Key warning buzzer operation
 On: Operate
 Off: Non-operation
INSIDE BUZZER This test is able to check warning chime in combination meter operation
 Take Out: Take away warning chime sounds when CONSULT-III screen is touched
 Key: Key warning chime sounds when CONSULT-III screen is touched
 Knob: OFF position warning chime sounds when CONSULT-III screen is touched
 Off: Non-operation
INDICATOR This test is able to check warning lamp operation
 KEY ON: “KEY” Warning lamp illuminates when CONSULT-III screen is touched
 KEY IND: “KEY” Warning lamp blinks when CONSULT-III screen is touched
 Off: Non-operation
INT LAMP This test is able to check interior room lamp operation
 On: Operate
 Off: Non-operation
LCD This test is able to check meter display information
 Engine start information displays when “BP N” on CONSULT-III screen is touched
 Engine start information displays when “BP I” on CONSULT-III screen is touched
 Key ID warning displays when “ID NG” on CONSULT-III screen is touched
 Steering lock information displays when “ROTAT” on CONSULT-III screen is touched
 P position warning displays when “SFT P” on CONSULT-III screen is touched
 INSRT: This item is displayed, but cannot be monitored
 BATT: This item is displayed, but cannot be monitored
 Take away through window warning displays when “NO KY” on CONSULT-III screen is
touched
 Take away warning displa y when “OUTKEY” on CONSUL T-III screen is touched
 OFF position warning display when “LK WN” on CONSULT-III screen is touched
FLASHER This test is able to check security hazard lamp operation
The hazard lamps are activated after “LH/RH/Off” on CONSULT-III screen is touched
P RANGE This test is able to check A/T shift selector power supply
 On: Operate
 Off: Non-operation
ENGINE SW ILLUMI This test is able to check push-button ignition switch illumination operation
Push-ignition switch illumination illuminates when “ON” on CONSULT-III screen is touched
Revision: 2010 May2011 QX56

PCS
B2614 ACC RELAY CIRCUITPCS-57
< DTC/CIRCUIT DIAGNOSIS > [POWER DISTRIBUTION SYSTEM]
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Is the inspection result normal?
YES >> Replace BCM. Refer to
BCS-81, "Removal and Installation".
NO >> Repair or replace harness.
3.CHECK ACCESSORY RELAY GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between accessory relay harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair accessory relay ground circuit.
4.CHECK ACCESSORY RELAY POWER SUPPLY CIRCUIT-2
1. Turn ignition switch ACC.
2. Check voltage between accessory relay harness connector and ground.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Check continuity open or short between accessory relay and battery.
5.CHECK ACCESSORY RELAY
Refer to PCS-57, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 6.
NO >> Replace accessory relay.
6.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
>> INSPECTION END
Component InspectionINFOID:0000000006220205
1.CHECK ACCESSORY RELAY
1. Turn ignition switch OFF.
2. Remove accessory relay.
Accessory relay
GroundContinuity
Te r m i n a l
1 Not existed
Accessory relay
GroundContinuity
Te r m i n a l
2 Existed
(+)
(–)Voltage (V)
(Approx.)
Accessory relay
Te r m i n a l5 Ground Battery voltage
Revision: 2010 May2011 QX56

PCS-60
< DTC/CIRCUIT DIAGNOSIS >[POWER DISTRIBUTION SYSTEM]
B2615 BLOWER RELAY CIRCUIT
YES >> GO TO 6.
NO >> Repair or replace harness.
3.CHECK BLOWER RELAY GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between blower relay harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair blower relay ground circuit.
4.CHECK BLOWER RELAY POWER SUPPLY CIRCUIT-2
1. Turn ignition switch ON or ACC.
2. Check voltage between blower relay harness connector and ground.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Check continuity open or short between blower relay and battery.
5.CHECK BLOWER RELAY
Refer to PCS-60, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 6.
NO >> Replace blower relay.
6.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
>> INSPECTION END
Component InspectionINFOID:0000000006220208
1.CHECK BLOWER RELAY
1. Turn ignition switch OFF.
2. Remove blower relay.
3. Check the continuity between blower relay terminals.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace blower relay
Blower relay
GroundContinuity
Te r m i n a l
2 Existed
(+)
(–)Voltage (V)
(Approx.)
Blower relay
Te r m i n a l 5 Ground Battery voltage
Terminals Condition Continuity
3 and 5 12 V direct current supply between terminals 1 and 2 Existed
No current supply Not existed
PBIB0098E
Revision: 2010 May2011 QX56

PCS-62
< DTC/CIRCUIT DIAGNOSIS >[POWER DISTRIBUTION SYSTEM]
B2616 IGNITION RELAY CIRCUIT
YES >> Replace BCM. Refer to
BCS-81, "Removal and Installation".
NO >> Repair or replace harness.
3.CHECK IGNITION RELAY-1 GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between igniti on relay-1 harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair ignition relay-1 ground circuit.
4.CHECK IGNITION RELAY-1 POWER SUPPLY CIRCUIT-2
1. Turn ignition switch ON.
2. Check voltage between ignition relay-1 harness connector and ground.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Check continuity open or short between ignition relay-1 and battery.
5.CHECK IGNITION RELAY-1
Refer to PCS-62, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 6.
NO >> Replace ignition relay-1.
6.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
>> INSPECTION END
Component InspectionINFOID:0000000006220211
1.CHECK IGNITION RELAY-1
1. Turn ignition switch OFF.
2. Remove ignition relay-1.
3. Check the continuity between ignition relay-1 terminals.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace Ignition relay-1.
Ignition relay-1
GroundContinuity
Te r m i n a l
1 Existed
(+)
(–)Voltage (V)
(Approx.)
Ignition relay-1
Te r m i n a l 5 Ground Battery voltage
Terminals Condition Continuity
3 and 5 12 V direct current supply between terminals 1 and 2 Existed
No current supply Not existed
PBIB0098E
Revision: 2010 May2011 QX56

PCS-72
< DTC/CIRCUIT DIAGNOSIS >[POWER DISTRIBUTION SYSTEM]
PUSH-BUTTON IGNITION SWITCH
Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 4.
4.CHECK PUSH-BUTTON IGNITION SWITCH CIRCUIT 2
1. Disconnect BCM connector.
2. Check continuity between IPDM E/R harness connec tor and push-button ignition switch harness connec-
tor.
3. Check continuity between IP DM E/R harness connector and ground.
Is the inspection result normal?
YES >> Replace IPDM E/R.
NO >> Repair or replace harness.
5.CHECK PUSH-BUTTON IGNITION SWITCH GROUND CIRCUIT
Check continuity between push-button ignition switch harness connector and ground.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair or replace harness.
6.CHECK PUSH-BUTTON IGNITION SWITCH
Refer to PCS-72, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 7.
NO >> Replace push-button ignition switch.
7.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
>> INSPECTION END
Component InspectionINFOID:0000000006220224
1.CHECK PUSH-BUTTON IGNITION SWITCH
1. Turn ignition switch OFF.
2. Disconnect push-button ignition switch connector.
3. Check continuity between push- button ignition switch terminals.
(+)
(–)Voltage (V)
(Approx.)
IPDM E/R
Connector Terminal E17 66 Ground Battery voltage
IPDM E/R Push-button ignition switch Continuity
Connector Terminal Connector Terminal
E17 66 M101 4 Existed
IPDM E/R GroundContinuity
Connector Terminal
E17 66 Not existed
Push-button ignition switch GroundContinuity
Connector Terminal
M101 1 Existed
Revision: 2010 May2011 QX56