ground INFINITI QX56 2011 Factory Service Manual

BRC-76
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
C1111 PUMP MOTOR
1. Turn the ignition switch OFF.
2. Check 50A fusible link (M).
3. Check continuity and short circui
t between ABS actuator and electric unit (control unit) harness connector
terminal (4 or 47) and 50A fusible link (M).
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 ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) 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 MOTOR/ACCUMULATOR ASSEMBLY
Check motor/accumulator assembly. Refer to BR-15, "
Inspection".
Is the inspection result normal?
YES >> GO TO 5.
NO >> Replace motor/accumulator assembly. Refer to BR-29, "
Removal and Installation" and BR-30,
"Disassembly and Assembly".
5.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 electr ic 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-78
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
C1115 WHEEL SENSOR
Measurement connector and te
rminal for signal circuit
4. Check continuity between ABS actuator and electr ic unit (control unit) harness connector and the ground.
Measurement connector and terminal for ground circuit
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace error-detected parts.
4.CHECK WHEEL SENSOR
Check wheel sensor for damage, disconnection or looseness.
 Front wheel sensor: Refer to BRC-134, "
FRONT WHEEL SENSOR : Exploded View".
 Rear wheel sensor: Refer to BRC-135, "
REAR WHEEL SENSOR : Exploded View".
Is the inspection result normal?
YES >> GO TO 5.
NO >> Replace wheel sensor.  Front wheel sensor: Refer to BRC-134, "
FRONT WHEEL SENSOR : Removal and Installation".
 Rear wheel sensor: Refer to BRC-135, "
REAR WHEEL SENSOR : Removal and Installation".
5.CHECK TERMINAL
 Check ABS actuator and electric unit (control unit) pin terminals for damage or loose connection with har-
ness connector.
 Check each wheel sensor pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair or replace error-detected parts.
6.REPLACE WHEEL SENSOR
With CONSULT-III.
1. Connect ABS actuator and electric unit (control unit) harness connector.
2. Replace wheel sensor. Refer to BRC-134, "
FRONT WHEEL SENSOR : Removal and Installation" (front),
BRC-135, "
REAR WHEEL SENSOR : Removal and Installation" (rear).
3. Erase Self-diagnosis result for “ABS”.
4. Start the engine. Drive the vehicle at vehi cle speed of approx. 30 km/h for approx. 1 minute.
5. Perform self-diagnosis for “ABS”.
DTC Is DTC
“C1115” detected?
YES >> Replace ABS actuator and electr ic unit (control unit). Refer to BRC-137, "Removal and Installa-
tion".
NO >> INSPECTION END
ABS actuator and electric unit (control unit) Wheel sensor
Continuity
Connector Terminal Connector Terminal
E36 34 E22 (Front LH wheel)
2 Existed
19 E39 (Front RH wheel)
36 C10 (Rear LH wheel)
21 C11 (Rear RH wheel)
ABS actuator and electric unit (control unit)
—Continuity
Connector Terminal
E36 20, 34
Ground Not existed
33, 19
22, 36
35, 21
Revision: 2010 May2011 QX56

C1116 STOP LAMP SWITCHBRC-79
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
C1116 STOP LAMP SWITCH
DTC LogicINFOID:0000000006222603
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 6” detected?
YES >> Proceed to diagnosis procedure. Refer to BRC-79, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222604
1.CHECK STOP LAMP FOR ILLUMINATION
Depress brake pedal and check that stop lamp turns ON.
Does stop lamp turn ON?
YES >> GO TO 2.
NO >> Check stop lamp system. Refer to EXL-40, "
Wiring Diagram".
2.CHECK STOP LAMP SWITCH CLEARANCE
1. Turn the ignition switch OFF.
2. Check stop lamp clearance. Refer to BR-7, "
Inspection and Adjustment".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Adjust stop lamp switch clearance. Refer to BR-7, "
Inspection and Adjustment".
3.CHECK STOP LAMP SWITCH POWER SUPPLY (1)
1. Disconnect ABS actuator and electric unit (control unit) harness connector.
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 ABS actuator and electr ic unit (control unit) harness connector and ground.
DTC Display Item Malfunction detected condition Possible causes
C1116 STOP LAMP SW  When stop lamp switch signal is not input when brake
pedal depress.
 When stop lamp switch signal is not input when stop lamp relay operates.  Harness or connector
 Stop lamp switch
 Stop lamp relay
 ABS actuator and electric unit
(control unit)
 Battery power supply system
ABS actuator and electric unit (control unit) — Condition Voltage
Connector Terminal
E36 17 Ground Brake pedal depressed
Approx. 0 V
Brake pedal not depressed
Revision: 2010 May2011 QX56

BRC-80
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
C1116 STOP LAMP SWITCH
Is the inspection result normal?
YES >> GO TO 8.
NO >> GO TO 4.
4.CHECK STOP LAMP SWITCH CIRCUIT (1)
1. Turn the ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
3. Check continuity between ABS actuator and electr ic unit (control unit) harness connector and stop lamp
switch 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 5.
NO >> Repair or replace error-detected parts.
5.CHECK STOP LAMP SWITCH
Check stop lamp switch. Refer to BRC-85, "
Component Inspection (Stop lamp Switch)".
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair or replace stop lamp switch. Refer to BR-20, "
Removal and Installation".
6.CHECK STOP LAMP SWITCH POWER SUPPLY (2)
1. Check voltage between stop lamp switch harness connector and ground.
2. Turn the ignition switch ON. CAUTION:
Never start engine.
3. Check voltage between stop lamp switch harness connector and ground.
Is the inspection result normal?
YES >> Check pin terminals and connection of stop lamp switch harness connector for abnormal condi-
tions. Repair or replace error-detected parts.
NO >> GO TO 7.
ABS actuator and electric unit (control unit)
— Condition Voltage
Connector Terminal
E36 17 Ground Brake pedal depressed Battery voltage
Brake pedal not depressed Approx. 0 V
ABS actuator and electric unit (control unit) Stop lamp switch Continuity
Connector Terminal Connector Terminal
E36 17 E115 4 Existed
ABS actuator and electric unit (control unit) —Continuity
Connector Terminal
E36 17 Ground Not existed
Stop lamp switch — Voltage
Connector Terminal
E115 3 Ground Approx. 0 V
Stop lamp switch — Voltage
Connector Terminal
E115 3 Ground Battery voltage
Revision: 2010 May2011 QX56

C1116 STOP LAMP SWITCHBRC-81
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
7.CHECK STOP LAMP SWITCH CIRCUIT (2)
1. Turn the ignition switch OFF.
2. Check 10A fuse (#3).
3. Disconnect fuse block (J/B) harness connector.
4. Check fuse block (J/B) pin terminals for damage or loose connection with harness connector.
5. Check continuity between stop lamp switch harness connector and fuse block (J/B).
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.
8.CHECK STOP LAMP SWITCH 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 ABS actuator and electr ic unit (control unit) harness connector and ground.
Is the inspection result normal?
YES >> GO TO 13.
NO >> GO TO 9.
9.CHECK STOP LAMP SWITCH CIRCUIT (3)
1. Turn the ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
3. Check continuity between ABS actuator and electr ic unit (control unit) harness connector and stop lamp
switch harness connector.
4. Check continuity between ABS actuator and elec tric unit (control unit) harness connector and ground.
Is the inspection result normal?
Stop lamp switch Fuse block (J/B) Continuity
Connector Terminal Connector Terminal
E115 3 E103 4F Existed
ABS actuator and electric unit (control unit)
— Condition Voltage
Connector Terminal
E36 37 Ground Brake pedal depressed
Approx. 0 V
Brake pedal not depressed
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 (control unit) Stop lamp switch Continuity
Connector Terminal Connector Terminal
E36 37 E115 2 Existed
ABS actuator and electric unit (control unit) —Continuity
Connector Terminal
E36 37 Ground Not existed
Revision: 2010 May2011 QX56

BRC-82
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
C1116 STOP LAMP SWITCH
YES >> GO TO 10.
NO >> Repair or replace error-detected parts.
10.CHECK STOP LAMP SWITCH
Check stop lamp switch. Refer to BRC-85, "
Component Inspection (Stop lamp Switch)".
Is the inspection result normal?
YES >> GO TO 11.
NO >> Repair or replace stop lamp switch. Refer to BR-20, "
Removal and Installation".
11 .CHECK STOP LAMP SWITCH POWER SUPPLY (4)
1. Check voltage between stop lamp switch harness connector and ground.
2. Turn the ignition switch ON. CAUTION:
Never start engine.
3. Check voltage between stop lamp switch harness connector and ground.
Is the inspection result normal?
YES >> Check pin terminals and connection of stop lamp switch harness connector for abnormal condi- tions. Repair or replace error-detected parts.
NO >> GO TO 12.
12.CHECK STOP LAMP SWITCH CIRCUIT (4)
1. Turn the ignition switch OFF.
2. Check 10A fuse (#7).
3. Disconnect fuse block (J/B) harness connector.
4. Check fuse block (J/B) pin terminals for damage or loose connection with harness connector.
5. Check continuity between stop lamp swit ch 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.
13.CHECK STOP LAMP RELAY POWER SUPPLY (1)
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 ABS actuator and electr ic unit (control unit) harness connector and ground.
Stop lamp switch
— Voltage
Connector Terminal
E115 1 Ground Approx. 0 V
Stop lamp switch — Voltage
Connector Terminal
E115 1 Ground Battery voltage
Stop lamp switch Fuse block (J/B) Continuity
Connector Terminal Connector Terminal
E115 1 E103 8F Existed
ABS actuator and electric unit (control unit)
—Voltage
Connector Terminal
E36 46 Ground Approx. 0 V
Revision: 2010 May2011 QX56

C1116 STOP LAMP SWITCHBRC-83
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
Is the inspection result normal?
YES >> GO TO 18.
NO >> GO TO 14.
14.CHECK STOP LAMP RELAY CIRCUIT (1)
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 15.
NO >> Repair or replace error-detected parts.
15.CHECK STOP LAMP RELAY
Check stop lamp relay. Refer to BRC-86, "
Component Inspection (Stop Lamp Relay)".
Is the inspection result normal?
YES >> GO TO 16.
NO >> Repair or replace stop lamp relay.
16.CHECK STOP LAMP RELAY POWER SUPPLY (2)
1. Turn the ignition switch OFF.
2. Check voltage between stop lamp relay 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 >> Check pin terminals and connection of stop lamp relay harness connector for abnormal condi- tions. Repair or replace error-detected parts.
NO >> GO TO 17.
ABS actuator and electric unit (control unit) —Voltage
Connector Terminal
E36 46 Ground Battery voltage
ABS actuator and electric unit (control unit) Stop lamp relay Continuity
Connector Terminal Connector Terminal
E3646E58 2Existed
ABS actuator and electric unit (control unit) —Continuity
Connector Terminal
E36 46 Ground Not existed
Sto p l am p rela y —Voltage
Connector Terminal
E58 1 Ground Approx. 0 V
Sto p l am p rela y —Voltage
Connector Terminal
E58 1 Ground Battery voltage
Revision: 2010 May2011 QX56

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
E
G H
I
J
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-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