2007 INFINITI QX56 Factory Service Manual

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Page 1601 of 3061

INFINITI QX56 2007 Factory Service Manual EC-518
< SERVICE INFORMATION >
DTC P1564 ASCD STEERING SWITCH
• Combination switch (spiral cable)
• Harness for open and short between ECM and combination switch
>> Repair open circuit or short to

Page 1602 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P1568 ICC FUNCTION
EC-519
< SERVICE INFORMATION >
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DTC P1568 ICC FUNCTION
On Board Diagnosis LogicINFOID:0000000003532053
•This self-diagnosis has the one trip det

Page 1603 of 3061

INFINITI QX56 2007 Factory Service Manual EC-520
< SERVICE INFORMATION >
DTC P1572 ICC BRAKE SWITCH
DTC P1572 ICC BRAKE SWITCH
Component DescriptionINFOID:0000000003532056
When the brake pedal is depressed, ICC brake switch is turned OFF
and

EC-520
< SERVICE INFORMATION >
DTC P1572 ICC BRAKE SWITCH
DTC P1572 ICC BRAKE SWITCH
Component DescriptionINFOID:0000000003532056
When the brake pedal is depressed, ICC brake switch is turned OFF
and stop lamp switch is turned ON. ECM detects the state of the
brake pedal by this input of two kinds (ON/OFF signal).
Refer to ACS-6
for the ICC function.
CONSULT-II Reference Value in Data Monitor ModeINFOID:0000000003532057
Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000003532058
•This diagnosis has the one trip detection logic.
•The MIL will not light up for this self-diagnosis.
NOTE:
•If DTC P1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
to EC-444
.
•This self-diagnosis has the one trip 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 OFF. And even when malfunction A is detected in two
consecutive trips, DTC is not stored in ECM memory.
DTC Confirmation ProcedureINFOID:0000000003532059
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
• If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
BBIA0470E
MONITOR ITEM CONDITION SPECIFICATION
BRAKE SW1
(ICC brake switch)• Ignition switch: ONBrake pedal: Fully released ON
Brake pedal: Slightly depressed OFF
BRAKE SW2
(stop lamp switch)• Ignition switch: ONBrake pedal: Fully released OFF
Brake pedal: Slightly depressed ON
DTC No.Trouble diagnosis
nameDTC detecting condition Possible cause
P1572
1572ICC brake switchA)When vehicle speed is above 30 km/h (19
MPH), ON signals from the stop lamp
switch and the ICC brake switch are sent to
ECM at the same time.• Harness or connectors
(The stop lamp switch circuit is shorted.)
• Harness or connectors
(The ICC brake switch circuit is shorted.)
• Stop lamp switch
• ICC brake switch
• ICC brake hold relay
• Incorrect stop lamp switch installation
• Incorrect ICC brake switch installation
•ECM B)ICC brake switch signal is not sent to ECM
for extremely long time while the vehicle is
driving

Page 1604 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P1572 ICC BRAKE SWITCH
EC-521
< SERVICE INFORMATION >
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• Procedure for malfunction B is not described here. It takes extremely long time to complete procedure for

Page 1605 of 3061

INFINITI QX56 2007 Factory Service Manual EC-522
< SERVICE INFORMATION >
DTC P1572 ICC BRAKE SWITCH
Wiring Diagram
INFOID:0000000003532060
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do

Page 1606 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P1572 ICC BRAKE SWITCH
EC-523
< SERVICE INFORMATION >
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Diagnosis ProcedureINFOID:0000000003532061
1.CHECK OVERALL FUNCTION-I
With CONSULT-II
1. Turn ignition switch

Page 1607 of 3061

INFINITI QX56 2007 Factory Service Manual EC-524
< SERVICE INFORMATION >
DTC P1572 ICC BRAKE SWITCH
Without CONSULT-II
Check voltage between ECM terminal 101 and ground under the fol-
lowing conditions.
OK or NG
OK >> GO TO 14.
NG >> GO TO 1

Page 1608 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P1572 ICC BRAKE SWITCH
EC-525
< SERVICE INFORMATION >
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6.CHECK ICC BRAKE SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ICC brake switch harn

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