2007 INFINITI M35 Factory Service Manual

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Page 2817 of 4647

INFINITI M35 2007 Factory Service Manual EC-1288
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DTC P1572 ICC BRAKE SWITCH
Revision: 2007 April2007 M35/M45
Component InspectionNBS005MU
ICC BRAKE SWITCH
1. Turn ignition switch OFF.
2. Disconnect ICC brake switch harness connector

Page 2818 of 4647

INFINITI M35 2007 Factory Service Manual DTC P1572 ASCD BRAKE SWITCH
EC-1289
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Revision: 2007 April2007 M35/M45
DTC P1572 ASCD BRAKE SWITCHPFP:25320
Component DescriptionNBS005MV
When the brake pedal is depre

DTC P1572 ASCD BRAKE SWITCH
EC-1289
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DTC P1572 ASCD BRAKE SWITCHPFP:25320
Component DescriptionNBS005MV
When the brake pedal is depressed, ASCD brake switch (2) is
turned OFF and stop lamp switch (1) is turned ON. ECM detects the
state of the brake pedal by this input of two kinds (ON/OFF signal).
Refer to EC-738, "
AUTOMATIC SPEED CONTROL DEVICE
(ASCD)" for the ASCD function.
CONSULT-II Reference Value in Data Monitor ModeNBS005MW
Specification data are reference values.
On Board Diagnosis LogicNBS005MX
This self-diagnosis has the one trip detection logic.
The MIL will not light up for this diagnosis.
NOTE:
If DTC P1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605.
Refer to EC-1190, "
DTC P0605 ECM" .
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.
PBIB2705E
MONITOR ITEM CONDITION SPECIFICATION
BRAKE SW1
(ASCD 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 name DTC detecting condition Possible cause
P1572
1572ASCD brake switchA)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
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 vehi-
cle is driving.

Page 2819 of 4647

INFINITI M35 2007 Factory Service Manual EC-1290
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DTC P1572 ASCD BRAKE SWITCH
Revision: 2007 April2007 M35/M45
DTC Confirmation ProcedureNBS005MY
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has

Page 2820 of 4647

INFINITI M35 2007 Factory Service Manual DTC P1572 ASCD BRAKE SWITCH
EC-1291
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Revision: 2007 April2007 M35/M45
Wiring Diagram NBS005MZ
TBWT1050E

Page 2821 of 4647

INFINITI M35 2007 Factory Service Manual EC-1292
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DTC P1572 ASCD BRAKE SWITCH
Revision: 2007 April2007 M35/M45
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground

Page 2822 of 4647

INFINITI M35 2007 Factory Service Manual DTC P1572 ASCD BRAKE SWITCH
EC-1293
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Revision: 2007 April2007 M35/M45
2. CHECK OVERALL FUNCTION-II
With CONSULT-II
Check “BRAKE SW2” indication in “DATA MONITO

Page 2823 of 4647

INFINITI M35 2007 Factory Service Manual EC-1294
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DTC P1572 ASCD BRAKE SWITCH
Revision: 2007 April2007 M35/M45
3. CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch (2) harness c

Page 2824 of 4647

INFINITI M35 2007 Factory Service Manual DTC P1572 ASCD BRAKE SWITCH
EC-1295
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7. CHECK ASCD BRAKE SWITCH
Refer to EC-1296, "
Component Inspection"
OK or NG
OK >> GO TO 13.

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