2011 INFINITI QX56 turn signal

P1556, P1557 BATTERY TEMPERATURE SENSOR
EC-429
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2.CHECK BATTERY TEMPERATURE SENSOR INPUT SIGNAL CIRCUIT-II
1. Turn ignition switch ON.
2. Disconnect ECM harness connector.
3. Check the continuity between battery current sensor harness connector and ECM harness connector.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair open circuit.
3.CHECK SENSOR POWER SUPPLY CIRCUIT
Check harness for short to power and short to ground, between the following terminals.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair short to ground or short to power in harness or connectors.
4.CHECK COMPONENTS
Check the following.
 Camshaft position sensor (bank 1) (Refer to EC-306, "
Component Inspection (Camshaft Position Sensor)".)
 CKP sensor (Refer to EC-301, "
Component Inspection (Crankshaft Position Sensor)".)
 Battery current sensor sensor (Refer to EC-423, "
Component Inspection (Battery Current Sensor)".)
 Refrigerant pressure sensor (Refer to EC-520, "
Diagnosis Procedure".)
 EVAP control system pressure sensor (Refer to EC-335, "
Component Inspection (EVAP Control System
Pressure Sensor)".)
Is the inspection result normal?
YES >> GO TO 5.
NO >> Replace malfunctioning component.
5.CHECK APP SENSOR
Refer to EC-470, "
Component Inspection (Accelerator Pedal Position Sensor)".
Is the inspection result normal?
YES >> GO TO 9.
NO >> GO TO 6.
6.REPLACE ACCELERATOR PEDAL ASSEMBLY
Replace accelerator pedal assembly.
>> INSPECTION END
7.CHECK BATTERY TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
Battery current sensor ECM
Continuity
Connector Terminal Connector Terminal
E63 1 E80 139 Existed
ECM Sensor
Connector Terminal Name Connector Terminal
F110 76 Crankshaft position sensor F74 1
77 Camshaft position sensor (bank 1) F84 1
E80 133Battery current sensor E63 2
Refrigerant pressure sensor E77 1
EVAP control system pressure sen-
sor
C17 3
131 APP sensor 2 (Without ICC) E110 1
APP sensor 2 (with ICC) E67 9
Revision: 2010 May2011 QX56

P1564 ASCD STEERING SWITCHEC-431
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
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P1564 ASCD STEERING SWITCH
DTC LogicINFOID:0000000006217935
DTC DETECTION LOGIC
NOTE:
If DTC P1564 is displayed with DTC P0605, first pe
rform the trouble diagnosis for DTC P0605. Refer to
EC-376, "
DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON and wait at least 10 seconds.
2. Press MAIN switch for at least 10 seconds, then release it and wait at least 10 seconds.
3. Press CANCEL switch for at least 10 seconds, then release it and wait at least 10 seconds.
4. Press RESUME/ACCELERATE switch for at least 10 seconds, then release it and wait at least 10 sec-
onds.
5. Press SET/COAST switch for at least 10 seconds , then release it and wait at least 10 seconds.
6. Check DTC.
Is DTC detected?
YES >> Go to EC-431, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006217936
1.CHECK ASCD STEERING SWITCH CIRCUIT
WITH CONSULT-III
1. Turn ignition switch ON.
2. Select “MAIN SW”, “CANCEL SW”, “RESUME/ACC SW” and “SET SW” in “DATA MONITOR” mode with
CONSULT-III.
3. Check each item indication under the following conditions.
DTC No. Trouble diagnosis name
(Trouble diagnosis content) DTC detecting condition Possible cause
P1564 ASCD SW
(ASCD steering switch)  An excessively high voltage signal from the
ASCD steering switch is sent to ECM.
 ECM detects that input signal from the ASCD steering switch is out of the specified
range.
 ECM detects that the ASCD steering switch is stuck ON.  Harness or connectors
(The switch circuit is open or shorted.)
 ASCD steering switch
ECM
Monitor item Condition Indication
MAIN SW MAIN switch Pressed ON
Released OFF
CANCEL SW CANCEL switch Pressed ON
Released OFF
RESUME/ACC SW RESUME/ACCELERATE
switch Pressed ON
Released OFF
Revision: 2010 May2011 QX56

EC-432
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P1564 ASCD STEERING SWITCH
WITHOUT CONSULT-III
1. Turn ignition switch ON.
2. Check the voltage between ECM harness connector terminals under the following conditions.
Is the inspection result normal?
YES >> GO TO 7.
NO >> GO TO 2.
2.CHECK ASCD STEERING SWITCH GRO UND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Disconnect combination switch harness connector.
4. Check the continuity between combination switch and ECM harness connector.
5. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3.
3.DETECT MALFUNCTIONING PART
Check the following.
 Combination switch (spiral cable)
 Harness for open and short between ECM and combination switch
>> Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK ASCD STEERING SWITCH INPUT SI GNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between combination switch and ECM harness connector.
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 5.
SET SW SET/COAST switch Pressed ON
Released OFF
ECM Condition Voltage (V)
Connector +–
Te r m i n a l Te r m i n a l
E80 128
(ASCD steering switch signal) 130MAIN switch: Pressed Approx. 0
CANCEL switch: Pressed Approx. 1
SET/COAST switch: Pressed Approx. 2
RESUME/ACCELERATE switch: Pressed Approx. 3
All ASCD steering switches: Released Approx. 4
Monitor item Condition Indication
Combination switch ECM
Continuity
Connector Terminal Connector Terminal
— 32 E80 130 Existed
Combination switch ECM Continuity
Connector Terminal Connector Terminal
— 25 E80 128 Existed
Revision: 2010 May2011 QX56

EC-434
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P1564 ICC STEERING SWITCH
P1564 ICC STEERING SWITCH
DTC LogicINFOID:0000000006217938
DTC DETECTION LOGIC
NOTE:
If DTC P1564 is displayed with DTC P0605, first pe
rform the trouble diagnosis for DTC P0605. Refer to
EC-376, "
DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON and wait at least 10 seconds.
2. Press MAIN switch for at least 10 seconds, then release it and wait at least 10 seconds.
3. Press CANCEL switch for at least 10 seconds , then release it and wait at least 10 seconds.
4. Press RESUME/ACCELERATE switch for at least 10 seconds, then release it and wait at least 10 sec-
onds.
5. Press SET/COAST switch for at least 10 seconds , then release it and wait at least 10 seconds.
6. Press DISTANCE switch for at least 10 seconds , then release it and wait at least 10 seconds.
7. Press LDP switch for at least 10 seconds, t hen release it at wait at least 10 seconds.
8. Check DTC.
Is DTC detected?
YES >> Go to EC-434, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006217939
1.CHECK ICC STEERING SWITCH CIRCUIT
1. Turn ignition switch ON.
2. Check the voltage between ECM harness connector terminals under the following conditions.
DTC No. Trouble diagnosis name
(Trouble diagnosis content) DTC detecting condition Possible cause
P1564 ASCD SW
(ICC steering switch)  An excessively high voltage signal from the
ICC steering switch is sent to ECM.
 ECM detects that input signal from the ICC steering switch is out of the specified range.
 ECM detects that the ICC steering switch is stuck ON.  Harness or connectors
(The switch circuit is open or shorted.)
 ICC steering switch
ECM
Revision: 2010 May2011 QX56

P1564 ICC STEERING SWITCHEC-435
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Is the inspection result normal?
YES >> GO TO 7.
NO >> GO TO 2.
2.CHECK ICC STEERING SWITCH GRO
UND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Disconnect combination switch harness connector.
4. Check the continuity between combination switch and ECM harness connector.
5. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3.
3.DETECT MALFUNCTIONING PART
Check the following.
 Combination switch (spiral cable)
 Harness for open and short between ECM and combination switch
>> Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK ICC STEERING SWITCH INPUT SI GNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between combination switch and ECM harness connector.
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 5.
5.DETECT MALFUNCTIONING PART
Check the following.
 Combination switch (spiral cable)
 Harness for open and short between ECM and combination switch
ECM
Condition Voltage (V)
Connector +–
Te r m i n a l Te r m i n a l
E80 128
(ICC steering switch signal) 130MAIN switch: Pressed Approx. 0
DYNAMIC DRIVER ASSISTANCE switch: Pressed Approx. 1.0
CANCEL switch: Pressed Approx. 1.9
DISTANCE switch: Pressed Approx. 2.6
SET/COAST switch: Pressed Approx. 3.2
RESUME/ACCELERATE switch: Pressed Approx. 3.7
All ICC steering switches: Released Approx. 4.2
Combination switch ECM
Continuity
Connector Terminal Connector Terminal
— 32 E80 130 Existed
Combination switch ECM Continuity
Connector Terminal Connector Terminal
— 25 E80 130 Existed
Revision: 2010 May2011 QX56

P1568 ICC FUNCTIONEC-437
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P1568 ICC FUNCTION
DTC LogicINFOID:0000000006217941
DTC DETECTION LOGIC
NOTE:

If DTC P1568 is displayed with DTC UXXXX, perform the trouble diagnosis for DTC UXXXX.
 If DTC P1568 is displayed with DTC P0605, perform the trouble diagnosis for DTC P0605. Refer to
EC-376, "
DTC Logic".
 If DTC P1568 is displayed with DTC P0607, perform the trouble diagnosis for DTC P0607. Refer to
EC-378, "
DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Step 2 may be conducted with the dr ive wheels lifted in the shop or by driving the vehicle. If a road test
is expected to be easier, it is unnecessary to lift the vehicle.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Press MAIN switch on ICC steering switch.
3. Drive the vehicle at more than 40 km/h (25 MPH). CAUTION:
Always drive vehicle at a safe speed.
4. Press SET/COAST switch.
5. Check DTC.
Is DTC detected?
YES >> Go to EC-437, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006217942
1.REPLACE ADAS CONTROL UNIT
1. Replace ADAS control unit. Refer to DAS-63, "
Removal and Installation".
2. Check DTC of ADAS control unit. Refer to DAS-38, "
DTC Index".
>> INSPECTION END
DTC No. Trouble diagnosis name
(Trouble diagnosis content) DTC Detecting Condit
ion Possible Cause
P1568 ICC COMMAND VALUE
(ICC function) ECM detects a difference between signals
from ADAS control unit is out of specified
range.  Harness or connectors
(The CAN communication line is open or
shorted.)
 ADAS control unit
ECM
Revision: 2010 May2011 QX56

EC-438
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P1572 ASCD BRAKE SWITCH
P1572 ASCD BRAKE SWITCH
DTC LogicINFOID:0000000006217943
DTC DETECTION LOGIC
NOTE:

If DTC P1572 is displayed with DTC P0605, first pe rform the trouble diagnosis for DTC P0605. Refer
to EC-376, "
DTC Logic".
 This self-diagnosis has the one tr ip detection logic. When malfunction A is detected, DTC is not
stored in ECM memory. And in that case, 1st trip DTC and 1st trip freeze frame data are displayed.
1st trip DTC is erased when ignition switch is tu rned OFF. And even when malfunction A is detected
in two consecutive trips, DTC is not stored in ECM memory.
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
NOTE:
The procedure for malfunction B is not described. It ta kes an extremely long time to complete the procedure
for malfunction B. By performing the procedure for malfunc tion A, the condition that causes malfunction B can
be detected.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A
1. Start engine (VDC switch OFF).
2. Press MAIN switch and check that CRUISE indicator is displayed in combination meter.
3. Drive the vehicle for at least 5 consec utive seconds under the following conditions.
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
This procedure may be conducted with the drive wheel s lifted in the shop or by driving the vehicle.
If a road test is expected to be easier , it is unnecessary to lift the vehicle.
4. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-439, "Diagnosis Procedure".
NO >> GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE
1. Drive the vehicle for at least 5 consec utive seconds under the following conditions.
CAUTION:
DTC No. Trouble diagnosis name
(Trouble diagnosis content) DTC detecting condition Possible cause
P1572 ASCD BRAKE SW
(ASCD brake switch) A)
When the vehicle speed is above 30 km/h
(19 MPH), ON signals from the stop lamp
switch and the ASCD brake switch are
sent to the ECM at the same time.  Harness or connectors
(The stop lamp switch circuit is shorted.)
 Harness or connectors
(The ASCD brake switch circuit is short-
ed.)
 Stop lamp switch
 ASCD brake switch
 Incorrect stop lamp switch installation
 Incorrect ASCD brake switch installation
ECM
B)
ASCD brake switch signal is not sent to
ECM for extremely long time while the ve-
hicle is being driven.
Vehicle speed More than 30 km/h (19 mph)
Selector lever Suitable position
Revision: 2010 May2011 QX56

P1572 ASCD BRAKE SWITCHEC-439
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Always drive vehicle at a safe speed.
NOTE:
This procedure may be conducted with the drive wheel
s lifted in the shop or by driving the vehicle.
If a road test is expected to be easier , it is unnecessary to lift the vehicle.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-439, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006217944
1.CHECK OVERALL FUNCTION-I
WITH CONSULT-III
1. Turn ignition switch ON.
2. Select “BRAKE SW1” in “DATA MONITOR” mode with CONSULT-III.
3. Check “BRAKE SW1” indication under the following conditions.
WITHOUT CONSULT-III
1. Turn ignition switch ON.
2. Check the voltage between ECM harness connector terminals as per the following.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 3.
2.CHECK OVERALL FUNCTION-II
WITH CONSULT-III
Select “BRAKE SW2” and check indication under the following conditions.
WITHOUT CONSULT-III
Check the voltage between ECM harness connector terminals under the following conditions.
Vehicle speed More than 30 km/h (19 mph)
Selector lever Suitable position
Driving location Depress the brake pedal for more than 5 seconds so as
not to come off from the above-mentioned vehicle speed.
Monitor item Condition Indication
BRAKE SW1
(ASCD brake switch) Brake pedalSlightly depressed OFF
Fully released ON
ECM Condition Voltage (V)
Connector +–
Terminal Terminal
E80 147
(ASCD brake switch signal) 175 Brake pedalSlightly depressed Approx. 0
Fully released Battery voltage
Monitor item Condition Indication
BRAKE SW2
(Stop lamp switch) Brake pedalSlightly depressed ON
Fully released OFF
Revision: 2010 May2011 QX56