INFINITI QX56 2011 Factory Service Manual

BRC-84
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
C1116 STOP LAMP SWITCH
17.CHECK STOP LAMP RELAY CIRCUIT (2)
1. Turn the ignition switch OFF.
2. Check 10A fuse (#57).
3. Disconnect IPDM E/R harness connector.
4. Check IPDM E/R pin terminals for dam age or loose connection with harness connector.
5. Check continuity between stop lamp relay harness connector and IPDM E/R harness connector.
Is the inspection result normal?
YES >> Perform trouble diagnosis for ignition power supply. Refer to PG-89, "Wiring Diagram - IGNITION
POWER SUPPLY -".
NO >> Repair or replace error-detected parts.
18.CHECK STOP LAMP RELAY POWER SUPPLY (3)
1. Turn the ignition switch OFF.
2. Check voltage between ABS actuator and electr ic unit (control unit) harness connector and ground.
3. Turn the ignition switch ON. CAUTION:
Never start engine.
4. Check voltage between stop lamp relay harness connector and ground.
Is the inspection result normal?
YES >> GO TO 22.
NO >> GO TO 19.
19.CHECK STOP LAMP RELAY CIRCUIT (3)
1. Turn the ignition switch OFF.
2. Disconnect stop lamp relay harness connector.
3. Check continuity between ABS actuator and electr ic unit (control unit) harness connector and stop lamp
relay harness connector.
4. Check continuity between ABS actuator and elec tric unit (control unit) harness connector and ground.
Is the inspection result normal?
YES >> GO TO 20.
Stop lamp relay IPDM E/R Continuity
Connector Terminal Connector Terminal
E581E1559Existed
ABS actuator and electric unit (control unit)
—Voltage
Connector Terminal
E36 37 Ground Approx. 0 V
ABS actuator and electric unit (control unit) — Condition Voltage
Connector Terminal
E36 37 Ground Brake pedal depressed Battery voltage
Brake pedal not depressed Approx. 0 V
ABS actuator and electric unit (c ontrol unit) Stop lamp relay
Continuity
Connector Terminal Connector Terminal
E3637E58 5Existed
ABS actuator and electric unit (control unit) —Continuity
Connector Terminal
E36 37 Ground Not existed
Revision: 2010 May2011 QX56

C1116 STOP LAMP SWITCHBRC-85
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
C
D
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G H
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K L
M A
B
BRC
N
O P
NO >> Repair or replace error-detected parts.
20.CHECK STOP LAMP RELAY POWER SUPPLY (4)
1. Check voltage between stop lamp relay harness connector and ground.
2. Turn the ignition switch ON. CAUTION:
Never start engine.
3. Check voltage between stop lamp relay harness connector and ground.
Is the inspection result normal?
YES >> Check pin terminals and connection of stop lamp relay harness connector for abnormal condi- tions. Repair or replace error-detected parts.
NO >> GO TO 21.
21.CHECK STOP LAMP RELAY CIRCUIT (4)
1. Check 10A fuse (#7).
2. Disconnect fuse block (J/B) harness connector.
3. Check fuse block (J/B) pin terminals for damage or loose connection with harness connector.
4. Check continuity between stop lamp re lay harness connector and fuse block (J/B).
Is the inspection result normal?
YES >> Perform trouble diagnosis for battery power supply. Refer to PG-11, "Wiring Diagram - BATTERY
POWER SUPPLY -".
NO >> Repair or replace error-detected parts.
22.CHECK TERMINAL
Check ABS actuator and electric unit (control unit) pin terminals for damage or loose connection with harness
connector.
Is the inspection result normal?
YES >> Replace ABS actuator and electric unit (control unit). Refer to BRC-137, "Removal and Installa-
tion".
NO >> Repair or replace error-detected parts.
Component Inspection (Stop lamp Switch)INFOID:0000000006222605
1.CHECK STOP LAMP SWITCH
1. Turn the ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
3. Check continuity when stop lamp switch is operated.
Sto p l am p rela y —Voltage
Connector Terminal
E58 3 Ground Battery voltage
Sto p l am p rela y —Voltage
Connector Terminal
E58 3 Ground Battery voltage
Stop lamp relay Fuse block (J/B) Continuity
Connector Terminal Connector Terminal
E58 3 E103 8F Existed
Revision: 2010 May2011 QX56

BRC-86
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
C1116 STOP LAMP SWITCH
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace stop lamp switch. Refer to
BR-20, "
Removal and Installation".
Component Inspection (Stop Lamp Relay)INFOID:0000000006222606
1.CHECK STOP LAMP RELAY
1. Apply 12 V to stop lamp relay connector terminal (1 and 2). CAUTION:
 Never make the terminals short.
 Connect the fuse between the termina ls when applying the voltage.
2. Check continuity between stop lamp relay connector terminals.
3. Check resistance between stop lamp relay connector terminals.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace stop lamp relay.
Stop lamp switch Condition Continuity
Te r m i n a l
1 − 2
3 − 4 When stop lamp switch is released
(When brake pedal is depressed)
Existed
When stop lamp switch is pressed
(When brake pedal is released) Not existed
Sto p l am p rela y
Condition Continuity
Te r m i n a l
3 − 5 Apply 12 V to stop lamp relay connector
terminal (1 and 2)
Existed
Do not apply 12 V to stop lamp relay con-
nector terminal (1 and 2) Not existed
Sto p l am p rela y Resistance
Te r m i n a l
1 − 2Approx. 50 Ω
Revision: 2010 May2011 QX56

C1118 TRANSFER CONTROL UNITBRC-87
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
C
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M A
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BRC
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C1118 TRANSFER CONTROL UNIT
DTC LogicINFOID:0000000006222607
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK DTC DETECTION
With CONSULT-III
1. Turn the ignition switch OFF to ON.
2. Perform self-diagnosis for “ABS”.
Is DTC
“C 111 8” detected?
YES >> Proceed to diagnosis procedure. Refer to BRC-87, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222608
1.CHECK TRANSFER CO NTROL UNIT SYSTEM
With CONSULT-III.
Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is any DTC detected?
YES >> Check the DTC.
NO >> GO TO 2.
2.CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
With CONSULT-III.
1. Erase Self-diagnosis result for “ABS”.
2. Turn the ignition switch OFF.
3. Start the engine and drive the vehicle for a short period of time.
4. Check that the 4WD warning lamp turns OFF.
5. After the vehicle stops, perform self-diagnosis for “ABS”.
Is DTC
“C 111 8” detected?
YES >> Replace ABS actuator and electric unit (control unit). Refer to BRC-137, "Removal and Installa-
tion".
NO >> Check pin terminals and connection of each harness connector for abnormal conditions. Repair or
replace error-detected parts.
DTC Display Item Malfunction detected condition Possible causes
C1118 4WD SYSTEM When a malfunction is detected in transfer control unit
system.  Transfer control unit
 ABS actuator and electric unit
(control unit)
 CAN communication line
Revision: 2010 May2011 QX56

BRC-88
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
C1120, C1122, C1124, C112
6 ABS IN VALVE SYSTEM
C1120, C1122, C1124, C1126 ABS IN VALVE SYSTEM
DTC LogicINFOID:0000000006222609
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK DTC DETECTION
With CONSULT-III
1. Turn the ignition switch OFF to ON.
2. Perform self-diagnosis for “ABS”.
Is DTC
“C1120”, “C1122”, “C1124” or “C1126” detected?
YES >> Proceed to diagnosis procedure. Refer to BRC-88, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222610
1.CHECK ABS IN VALVE POWER SUPPLY
1. Turn the ignition switch OFF.
2. Disconnect ABS actuator and electric unit (control unit) harness connector.
3. Check voltage between ABS actuator and electr ic unit (control unit) harness connector and ground.
4. Turn the ignition switch ON. CAUTION:
Never start engine.
5. Check voltage between ABS actuator and electr ic unit (control unit) harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK ABS IN VALVE POWER SUPPLY CIRCUIT
1. Turn the ignition switch OFF.
2. Check 30A fusible link (L).
3. Check continuity and short circui t between ABS actuator and electric unit (control unit) harness connector
terminal (1) and 30A fusible link (L).
Is the inspection result normal?
DTC Display Item Malfunction detected condition Possible causes
C1120 FR LH IN ABS SOL When a malfunction is detected in front LH ABS IN
valve.
 Harness or connector
 ABS actuator and electric unit (control unit)
 Fusible link
 Battery power supply system
C1122 FR RH IN ABS SOL
When a malfunction is detected in front RH ABS IN
valve.
C1124 RR LH IN ABS SOL When a malfunction is de
tected in rear LH ABS IN
valve.
C1126 RR RH IN ABS SOL When a malfunction is de
tected in rear RH ABS IN
valve.
ABS actuator and electric unit (control unit) — Voltage
Connector Terminal
E36 1 Ground Battery voltage
ABS actuator and electric unit (control unit)
—Voltage
Connector Terminal
E36 1 Ground Battery voltage
Revision: 2010 May2011 QX56

C1120, C1122, C1124, C1126 ABS IN VALVE SYSTEM
BRC-89
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
YES >> Perform trouble diagnosis for battery power supply. Refer to PG-11, "Wiring Diagram - BATTERY
POWER SUPPLY -".
NO >> Repair or replace error-detected parts.
3.CHECK ABS IN VALVE GROUND CIRCUIT
1. Turn the ignition switch OFF.
2. Check continuity between ABS actuator and electr ic unit (control unit) harness connector and the ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace error-detected parts.
4.CHECK TERMINAL
Check ABS actuator and electric unit (control unit) pin terminals for damage or loose connection with harness
connector.
Is the inspection result normal?
YES >> Replace ABS actuator and electric unit (control unit). Refer to BRC-137, "Removal and Installa-
tion".
NO >> Repair or replace error-detected parts.
ABS actuator and electric unit (control unit)
—Continuity
Connector Terminal
E36 2
Ground Existed
3
E37 48
Revision: 2010 May2011 QX56

BRC-90
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
C1121, C1123, C
1125, C1127 ABS OUT VALVE SYSTEM
C1121, C1123, C1125, C1127 ABS OUT VALVE SYSTEM
DTC LogicINFOID:0000000006222611
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK DTC DETECTION
With CONSULT-III
1. Turn the ignition switch OFF to ON.
2. Perform self-diagnosis for “ABS”.
Is DTC
“C1121”, “C1123”, “C1125” or “C1127” detected?
YES >> Proceed to diagnosis procedure. Refer to BRC-90, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222612
1.CHECK ABS OUT VALVE POWER SUPPLY
1. Turn the ignition switch OFF.
2. Disconnect ABS actuator and electric unit (control unit) harness connector.
3. Check voltage between ABS actuator and electr ic unit (control unit) harness connector and ground.
4. Turn the ignition switch ON. CAUTION:
Never start engine.
5. Check voltage between ABS actuator and electr ic unit (control unit) harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK ABS OUT VALVE POWER SUPPLY CIRCUIT
1. Turn the ignition switch OFF.
2. Check 30A fusible link (L).
3. Check continuity and short circui t between ABS actuator and electric unit (control unit) harness connector
terminal (1) and 30A fusible link (L).
Is the inspection result normal?
DTC Display Item Malfunction detected condition Possible causes
C1121 FR LH OUT ABS SOL When a malfunction is dete
cted in front LH ABS OUT
valve.
 Harness or connector
 ABS actuator and electric unit (control unit)
 Fusible link
 Battery power supply system
C1123 FR RH OUT ABS SOL
When a malfunction is detected in front RH ABS OUT
valve.
C1125 RR LH OUT ABS SOL When a malfunction is detected in rear LH ABS OUT
valve.
C1127 RR RH OUT ABS SOL When a malfunction is detected in rear RH ABS OUT
valve.
ABS actuator and electric
unit (control unit)
—Voltage
Connector Terminal
E36 1 Ground Battery voltage
ABS actuator and electric unit (control unit)
—Voltage
Connector Terminal
E36 1 Ground Battery voltage
Revision: 2010 May2011 QX56

C1121, C1123, C1125, C1127 ABS OUT VALVE SYSTEM
BRC-91
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
YES >> Perform trouble diagnosis for battery power supply. Refer to PG-11, "Wiring Diagram - BATTERY
POWER SUPPLY -".
NO >> Repair or replace error-detected parts.
3.CHECK ABS OUT VALVE GROUND CIRCUIT
1. Turn the ignition switch OFF.
2. Check continuity between ABS actuator and electr ic unit (control unit) harness connector and the ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace error-detected parts.
4.CHECK TERMINAL
Check ABS actuator and electric unit (control unit) pin terminals for damage or loose connection with harness
connector.
Is the inspection result normal?
YES >> Replace ABS actuator and electric unit (control unit). Refer to BRC-137, "Removal and Installa-
tion".
NO >> Repair or replace error-detected parts.
ABS actuator and electric unit (control unit) —Continuity
Connector Terminal
E36 2
Ground Existed
3
E37 48
Revision: 2010 May2011 QX56

BRC-92
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
C1130 ENGINE SIGNAL
C1130 ENGINE SIGNAL
DTC LogicINFOID:0000000006222613
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK DTC DETECTION
With CONSULT-III
1. Turn the ignition switch OFF to ON.
2. Perform self-diagnosis for “ABS”.
Is DTC
“C1130” detected?
YES >> Proceed to diagnosis procedure. Refer to BRC-92, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222614
1.CHECK ENGINE SYSTEM
With CONSULT-III.
Perform self-diagnosis for “ENGINE”.
Is any DTC detected?
YES >> Check the DTC.
NO >> GO TO 2.
2.CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
With CONSULT-III.
1. Erase Self-diagnosis result for “ABS”.
2. Turn the ignition switch OFF.
3. Start the engine and drive the vehicle for a short period of time.
4. Check that the malfunction indicator lamp (MIL) turns OFF.
5. After the vehicle stops, perform self-diagnosis for “ABS”.
Is DTC
“C1130” detected?
YES >> Replace ABS actuator and electr ic unit (control unit). Refer to BRC-137, "Removal and Installa-
tion".
NO >> Check pin terminals and connection of each harness connector for abnormal conditions. Repair or
replace error-detected parts.
DTC Display Item Malfunction detected condition Possible causes
C1130 ENGINE SIGNAL 1 When a malfunction is detected in ECM system. ECM
 ABS actuator and electric unit
(control unit)
 CAN communication line
Revision: 2010 May2011 QX56

C1140 ACTUATOR RELAY SYSTEMBRC-93
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
C
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G H
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M A
B
BRC
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C1140 ACTUATOR RELAY SYSTEM
DTC LogicINFOID:0000000006222615
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK DTC DETECTION
With CONSULT-III.
1. Turn the ignition switch OFF to ON.
2. Perform self-diagnosis for “ABS”.
Is DTC
“C1140” detected?
YES >> Proceed to diagnosis procedure. Refer to BRC-93, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222616
1.CHECK ACTUATOR RELAY POWER SUPPLY
1. Turn the ignition switch OFF.
2. Disconnect ABS actuator and electric unit (control unit) harness connector.
3. Check voltage between ABS actuator and electr ic unit (control unit) harness connector and ground.
4. Turn the ignition switch ON. CAUTION:
Never start engine.
5. Check voltage between ABS actuator and electr ic unit (control unit) harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK ACTUATOR RELAY POWER SUPPLY CIRCUIT
1. Turn the ignition switch OFF.
2. Check 30A fusible link (L).
3. Check continuity and short circuit between ABS act uator and electric unit (control unit) harness connector
terminal (1) and 30A fusible link (L).
Is the inspection result normal?
YES >> Perform trouble diagnosis for battery power supply. Refer to PG-11, "Wiring Diagram - BATTERY
POWER SUPPLY -".
NO >> Repair or replace error-detected parts.
3.CHECK ACTUATOR RELAY GROUND CIRCUIT
DTC Display Item Malfunction detected condition Possible causes
C1140 ACTUATOR RLY When a malfunction is detected in actuator relay.  Harness or connector
 ABS actuator and electric unit
(control unit)
Fusible link
 Battery power supply system
ABS actuator and electric unit (control unit) —Voltage
Connector Terminal
E36 1 Ground Battery voltage
ABS actuator and electric unit (control unit)
—Voltage
Connector Terminal
E36 1 Ground Battery voltage
Revision: 2010 May2011 QX56