2007 INFINITI QX56 Factory Service Manual

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Page 1609 of 3061

INFINITI QX56 2007 Factory Service Manual EC-526
< SERVICE INFORMATION >
DTC P1572 ICC BRAKE SWITCH
3. Check voltage between stop lamp switch terminal 3 and ground
with CONSULT -II or tester.
OK or NG
OK >> GO TO 12.
NG >> GO TO 11.
11 .DETEC

Page 1610 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P1572 ICC BRAKE SWITCH
EC-527
< SERVICE INFORMATION >
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3. Check continuity between ICC brake switch terminals 1 and 2
under the following conditions.
If NG, adjust I

Page 1611 of 3061

INFINITI QX56 2007 Factory Service Manual EC-528
< SERVICE INFORMATION >
DTC P1572 ASCD BRAKE SWITCH
DTC P1572 ASCD BRAKE SWITCH
Component DescriptionINFOID:0000000003532063
When the brake pedal is depressed, ASCD brake switch is turned
OFF a

EC-528
< SERVICE INFORMATION >
DTC P1572 ASCD BRAKE SWITCH
DTC P1572 ASCD BRAKE SWITCH
Component DescriptionINFOID:0000000003532063
When the brake pedal is depressed, ASCD 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 EC-30
for the ASCD function.
CONSULT-II Reference Value in Data Monitor ModeINFOID:0000000003532064
Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000003532065
•This self-diagnosis has the one trip detection logic.
•The MIL will not light up for this self-diagnosis.
NOTE:
•If DTC P 1572 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:0000000003532066
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.
• Procedure for malfunction B is not described here. It takes extremely long time to complete procedure for
malfunction B. By performing procedure for malfunction A, the incident that causes malfunction B can be
detected.
BBIA0373E
MONITOR ITEM CONDITION SPECIFICATION
BRAKE SW 1
(ASCD brake switch)• Ignition switch: ONBrake pedal: Fully released ON
Brake pedal: Slightly depressed OFF
BRAKE SW 2
(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
1572ASCD brake switchA)When the vehicle speed is above 30km/h (19
MPH), ON signals from the stop lamp switch
and the ASCD brake switch are sent to ECM
at the same time.• Harness or connectors
(The stop lamp switch circuit is shorted.)
• Harness or connectors
(The ASCD brake switch circuit is shorted.)
• 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 vehicle is
driving

Page 1612 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P1572 ASCD BRAKE SWITCH
EC-529
< SERVICE INFORMATION >
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TESTING CONDITION:
Steps 4 and 5 may be conducted with the drive wheels lifted in the shop or by driving the

Page 1613 of 3061

INFINITI QX56 2007 Factory Service Manual EC-530
< SERVICE INFORMATION >
DTC P1572 ASCD BRAKE SWITCH
Wiring Diagram
INFOID:0000000003532067
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do

Page 1614 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P1572 ASCD BRAKE SWITCH
EC-531
< SERVICE INFORMATION >
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Diagnosis ProcedureINFOID:0000000003532068
1.CHECK OVERALL FUNCTION-I
With CONSULT-II
1. Turn ignition switc

Page 1615 of 3061

INFINITI QX56 2007 Factory Service Manual EC-532
< SERVICE INFORMATION >
DTC P1572 ASCD BRAKE SWITCH
Without CONSULT-II
Check voltage between ECM terminal 101 and ground under the following conditions.
OK or NG
OK >> GO TO 11.
NG >> GO TO 7.

Page 1616 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P1572 ASCD BRAKE SWITCH
EC-533
< SERVICE INFORMATION >
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• Harness connectors M31, E152
• Fuse block (J/B) connector M4
• 10A fuse
• Harness for open or short

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