2006 INFINITI FX35 Service Manual

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Page 1921 of 4462

INFINITI FX35 2006 Service Manual DTC P1572 ICC BRAKE SWITCH EC-537
[VQ35DE]
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EC
Revision: 2006 December 2006 FX35/FX45
16. CHECK STOP LAMP SWITCH
Refer to EC-537, "
Component Inspection"
OK or

Page 1922 of 4462

INFINITI FX35 2006 Service Manual EC-538
[VQ35DE]
DTC P1572 ASCD BRAKE SWITCH
Revision: 2006 December 2006 FX35/FX45
DTC P1572 ASCD BRAKE SWITCHPFP:25320
Component DescriptionNBS003XK
When the brake pedal is depressed, ASCD brake swit

EC-538
[VQ35DE]
DTC P1572 ASCD BRAKE SWITCH
Revision: 2006 December 2006 FX35/FX45
DTC P1572 ASCD BRAKE SWITCHPFP:25320
Component DescriptionNBS003XK
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-36, "
AUTOMATIC SPEED CONTROL DEVICE (ASCD)"
for the ASCD function.
CONSULT-II Reference Value in Data Monitor ModeNBS003XL
Specification data are reference values.
On Board Diagnosis LogicNBS003XM
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-481, "
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.
PBIB1605E
MONITOR ITEM CONDITION SPECIFICATION
BRAKE SW1
(ASCD brake switch)
Ignition switch: ON Brake pedal: Fully released ON
Brake pedal: Slightly depressed OFF
BRAKE SW2
(Stop lamp switch)
Ignition switch: ON Brake pedal: Fully released OFF
Brake pedal: Slightly depressed ON
DTC No. Trouble Diagnosis
Name DTC Detecting Condition Possible Cause
P1572
1572 ASCD brake switch A)
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
(Stop lamp switch circuit is shorted.)
Harness or connectors
(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 1923 of 4462

INFINITI FX35 2006 Service Manual DTC P1572 ASCD BRAKE SWITCH EC-539
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Revision: 2006 December 2006 FX35/FX45
DTC Confirmation ProcedureNBS003XN
CAUTION:
Always drive vehicle at a safe sp

Page 1924 of 4462

INFINITI FX35 2006 Service Manual EC-540
[VQ35DE]
DTC P1572 ASCD BRAKE SWITCH
Revision: 2006 December 2006 FX35/FX45
Wiring Diagram NBS003XO
TBWM1402E

Page 1925 of 4462

INFINITI FX35 2006 Service Manual DTC P1572 ASCD BRAKE SWITCH EC-541
[VQ35DE]
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EC
Revision: 2006 December 2006 FX35/FX45
Specification data are reference values and are measured between each terminal

Page 1926 of 4462

INFINITI FX35 2006 Service Manual EC-542
[VQ35DE]
DTC P1572 ASCD BRAKE SWITCH
Revision: 2006 December 2006 FX35/FX45
2. CHECK OVERALL FUNCTION-II
With CONSULT-II
Check “BRAKE SW2” indication in “DATA MONITOR” mode.
Witho

Page 1927 of 4462

INFINITI FX35 2006 Service Manual DTC P1572 ASCD BRAKE SWITCH EC-543
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EC
Revision: 2006 December 2006 FX35/FX45
3. CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.

Page 1928 of 4462

INFINITI FX35 2006 Service Manual EC-544
[VQ35DE]
DTC P1572 ASCD BRAKE SWITCH
Revision: 2006 December 2006 FX35/FX45
7. CHECK ASCD BRAKE SWITCH
Refer to EC-545, "
Component Inspection"
OK or NG
OK >> GO TO 13.
NG >> Replace ASC

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