2011 INFINITI QX56 brake

C1111 PUMP MOTORBRC-75
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
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C1111 PUMP MOTOR
DTC LogicINFOID:0000000006222599
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK DTC DETECTION
With CONSULT-III.
1. Turn the ignition switch OFF and depress the brake pedal 20 times or more.
2. Start the engine and wait for 3 minutes or more. CAUTION:
Never drive the vehicle.
3. Depress the brake pedal, and then operate the ABS act uator and electric unit (control unit) motor repeats
ON and OFF 4 times or more.
CAUTION:
Never drive the vehicle.
4. Perform self-diagnosis for “ABS”.
Is DTC
“C 1111” detected?
YES >> Proceed to diagnosis procedure. Refer to BRC-75, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222600
1.CHECK ABS MOTOR AND MOTOR 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 ABS MOTOR AND MOTOR RELAY POWER SUPPLY CIRCUIT
DTC Display Item Malfunction detected condition Possible causes
C 1111 P U M P M O T O R  When a malfunction is detected in motor or motor
relay.
 When a low pressure malfunction is detected in ac- cumulator.
 When a malfunction is detected in accumulator
pressure sensor.  Harness or connector
 ABS actuator and electric unit
(control unit)
Fusible link
 Battery power supply system
 Motor/accumulator assembly
ABS actuator and electric unit (control unit)
—Voltage
Connector Terminal
E36 4 Ground Battery voltage
E37 47
ABS actuator and electric unit (control unit)
—Voltage
Connector Terminal
E36 4 Ground Battery voltage
E37 47
Revision: 2010 May2011 QX56

C1116 STOP LAMP SWITCHBRC-79
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
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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]
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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-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

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

C1142 PRESS SENSORBRC-95
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
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C1142 PRESS SENSOR
DTC LogicINFOID:0000000006222617
DTC DETECTION LOGIC
*: Models with Advanced Driver Assistance System
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
“C1142” detected?
YES >> Proceed to diagnosis procedure. Refer to BRC-95, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222618
1.CHECK STOP LAMP SWITCH SUSTEM
Check stop lamp switch system. Refer to BRC-79, "
Diagnosis Procedure".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace error-detected parts.
2.CHECK BRAKE FLUID LEACKAGE
Check brake fluid leakage. Refer to BR-10, "
Inspection".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace error-detected parts.
3.CHECK BRAKE PIPING
Check brake piping. Refer to BR-24, "
FRONT : Inspection" (front), BR-26, "REAR : Inspection" (rear).
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace error-detected parts.
4.CHECK BRAKE PEDAL
Check brake pedal. Refer to BR-21, "
Inspection and Adjustment".
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace error-detected parts.
5.CHECK HYDRAULIC BOOSTER ASSEMBLY
Check hydraulic booster assembly. Refer to BR-32, "
Inspection and Adjustment".
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair or replace error-detected parts.
6.CHECK FRONT DISC BRAKE
Check front disc brake. Refer to BR-39, "
BRAKE CALIPER ASSEMBLY : Inspection".
DTC Display Item Malfunction detected condition Possible causes
C1142 PRESS SEN CIRCUIT When a malfunction is detected in master cylinder
pressure sensor or control pressure sensor
*. Stop lamp switch system
 ABS actuator and electric unit
(control unit)
 Brake system
Revision: 2010 May2011 QX56

BRC-96
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
C1142 PRESS SENSOR
Is the inspection result normal?
YES >> GO TO 7.
NO >> Repair or replace error-detected parts.
7.CHECK REAR DISC BRAKE
Check rear disc brake. Refer to BR-45, "
BRAKE CALIPER ASSEMBLY : Inspection".
Is the inspection result normal?
YES >> GO TO 8.
NO >> Repair or replace error-detected parts.
8.CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
With CONSULT-III.
1. Erase Self-diagnosis result for “ABS”.
2. Start the engine and drive the vehicle for a short period of time.
3. Perform self-diagnosis for “ABS”.
Is DTC
“C1142” detected?
YES >> Replace ABS actuator and electr ic unit (control unit). Refer to BRC-137, "Removal and Installa-
tion"
NO >> Check ABS actuator and electric unit (control unit) harness connector and terminal for damage,
looseness and disconnection. Repair or replace error-detected parts.
Revision: 2010 May2011 QX56