INFINITI QX56 2011 Factory Service Manual

PCS-50
< WIRING DIAGRAM >[POWER DISTRIBUTION SYSTEM]
POWER DISTRIBUTION SYSTEM
JCMWM8333GB
Revision: 2010 May2011 QX56

PCS
POWER DISTRIBUTION SYSTEMPCS-51
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JCMWM8334GB
Revision: 2010 May2011 QX56

PCS-52
< WIRING DIAGRAM >[POWER DISTRIBUTION SYSTEM]
POWER DISTRIBUTION SYSTEM
JCMWM8335GB
Revision: 2010 May2011 QX56

PCS
DIAGNOSIS AND REPAIR WORK FLOWPCS-53
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BASIC INSPECTION
DIAGNOSIS AND REPAIR WORK FLOW
Work FlowINFOID:0000000006220202
OVERALL SEQUENCE
DETAILED FLOW
JMKIA3449GB
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PCS-54
< BASIC INSPECTION >[POWER DISTRIBUTION SYSTEM]
DIAGNOSIS AND REPAIR WORK FLOW
1.GET INFORMATION ABOUT SYMPTOM
Get detailed information from the customer about the symptom (the condition and the environment when the
incident/malfunction occurs).
>> GO TO 2.
2.CHECK DTC
1. Check DTC for BCM and IPDM E/R.
2. Perform the following procedure if DTC is displayed.
- Record DTC and freeze frame data (Pri nt them out with CONSULT-III.)
- Erase DTC.
- Study the relationship between the cause detected by DTC and the symptom described by the customer.
3. Check related service bulletins for information.
Are any symptoms described and any DTC detected?
Symptom is described, DTC is displayed>>GO TO 3.
Symptom is described, DTC is not displayed>>GO TO 4.
Symptom is not described, DTC is displayed>>GO TO 5.
3.CONFIRM THE SYMPTOM
Confirm the symptom described by the customer.
Connect CONSULT-III to the vehicle in the “DATA MO NITOR” mode and check real time diagnosis results.
Verify relation between the symptom and the condition when the symptom is detected.
>> GO TO 5.
4.CONFIRM THE SYMPTOM
Confirm the symptom described by the customer.
Connect CONSULT-III to the vehicle in the “DATA MO NITOR ” mode and check real time diagnosis results.
Verify relation between the symptom and the condition when the symptom is detected.
>> GO TO 6.
5.PERFORM DTC CONFIRMATION PROCEDURE
Perform DTC Confirmation Procedure for the display ed DTC, and then check that DTC is detected again.
At this time, always connect CONSULT-III to the vehicle, and check diagnostic results in real time.
If two or more DTCs are detected, refer to BCS-56, "
DTCInspectionPriorityChart", and determine trouble
diagnosis order.
NOTE:
Perform Component Function Check if DTC Confirmati on Procedure is not included in Service Manual. This
simplified check procedure is an effective alternativ e, although DTC cannot be detected during this check.
If the result of Component Function Check is NG, it is the same as the detection of DTC by DTC Confirmation
Procedure.
Is DTC detected?
YES >> GO TO 7.
NO >> Refer to GI-40, "
Intermittent Incident".
6.DETECT MALFUNCTIONING SYSTEM BY SYMPTOM DIAGNOSIS
Detect malfunctioning system according to SYMPTOM DIAGNOSIS based on the confirmed symptom in step
4, and determine the trouble diagnosis order based on possible causes and symptom.
>> GO TO 7.
7.DETECT MALFUNCTIONING PART BY DIAGNOSTIC PROCEDURE
Inspect according to Diagnostic Procedure of the system.
NOTE:
The Diagnostic Procedure described based on open circuit inspection. A short circuit inspection is also
required for the circuit check in the Diagnostic Procedure.
Revision: 2010 May2011 QX56

PCS
DIAGNOSIS AND REPAIR WORK FLOWPCS-55
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Is malfunctioning part detected?
YES >> GO TO 8.
NO >> Check voltage of related BCM terminals using CONSULT-III.
8.REPAIR OR REPLACE THE MALFUNCTIONING PART
1. Repair or replace the malfunctioning part.
2. Reconnect parts or connectors disconnected during Diagnostic Procedure again after repair and replace-
ment.
3. Check DTC. If DTC is displayed, erase it.
>> GO TO 9.
9.FINAL CHECK
When DTC was detected in step 2, perform DTC C onfirmation Procedure or Component Function Check
again, and then check that the malfunction is repaired securely.
When symptom was described by the customer, refer to c onfirmed symptom in step 3 or 4, and check that the
symptom is not detected.
Does the symptom reappear?
YES (DTC is detected)>>GO TO 7.
YES (Symptom remains)>>GO TO 6.
NO >> INSPECTION END
Revision: 2010 May2011 QX56

PCS-56
< DTC/CIRCUIT DIAGNOSIS >[POWER DISTRIBUTION SYSTEM]
B2614 ACC RELAY CIRCUIT
DTC/CIRCUIT DIAGNOSIS
B2614 ACC RELAY CIRCUIT
DTC LogicINFOID:0000000006220203
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn the power supply position to ACC under the following conditions, and wait for 2 second or more.
- Selector lever is in the P position
- Do not depress brake pedal
2. Check “Self-diagnosis result” of BCM with CONSULT-III.
Is DTC detected?
YES >> Go to PCS-56, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006220204
1.CHECK ACCESSORY RELAY POWER SUPPLY-1
1. Turn ignition switch OFF.
2. Disconnect accessory relay.
3. Check voltage between accessory relay harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK ACCESSORY RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM connector.
3. Check continuity between accessory relay harness connector and BCM harness connector.
4. Check continuity between accessory relay harness connector and ground.
DTC No. Trouble diagnosis
name DTC detecting condition Possible cause
B2614 BCM An immediate operation of accessory relay is re-
quested by BCM, but there is no response for more
than 2 second.  Harness or connectors
(Accessory relay ci rcuit is open or
shorted)
BCM
 Accessory relay
(+)
(–) Condition Voltage (V)
(Approx.)
Accessory relay
Te r m i n a l
1 Ground Ignition switch OFF 0
ACC or ON 12
Accessory relay BCM Continuity
Terminal Connector Terminal
1 M71 96 Existed
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PCS
B2614 ACC RELAY CIRCUITPCS-57
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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-58
< DTC/CIRCUIT DIAGNOSIS >[POWER DISTRIBUTION SYSTEM]
B2614 ACC RELAY CIRCUIT
3. Check the continuity between accessory relay terminals.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace accessory relay
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
B2615 BLOWER RELAY CIRCUITPCS-59
< DTC/CIRCUIT DIAGNOSIS > [POWER DISTRIBUTION SYSTEM]
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B2615 BLOWER RELAY CIRCUIT
DTC LogicINFOID:0000000006220206
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON under the following conditions, and wait for 1 second or more.
- Selector lever is in the P position
- Do not depress brake pedal
2. Check “Self-diagnosis result” of BCM with CONSULT-III.
Is DTC detected?
YES >> Go to PCS-59, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006220207
1.CHECK BLOWER RELAY POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect blower relay.
3. Check voltage between blower relay harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK BLOWER RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM connector.
3. Check continuity between blower relay harness connector and BCM harness connector.
4. Check continuity between blower relay harness connector and ground.
Is the inspection result normal?
DTC No. Trouble diagnosis
name DTC detecting condition Possible cause
B2615 BCM BCM detects a difference of signal for 1 second or
more between the following items.
 Blower relay ON/OFF request
 Blower relay feedback  Harness or connectors
(Blower relay circuit is open or
shorted)
BCM
 Blower relay
(+)
(–) Condition Voltage (V)
(Approx.)
Blower relay
Te r m i n a l
1 Ground Ignition switch OFF or ACC 0
ON 12
Blower relay BCM Continuity
Terminal Connector Terminal
1 M71 106 Existed
Blower relay GroundContinuity
Te r m i n a l
1 Not existed
Revision: 2010 May2011 QX56