2006 INFINITI QX56 Factory Service Manual

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Page 1721 of 3383

INFINITI QX56 2006 Factory Service Manual EC-510Revision: November 2009
DTC P1572 ICC BRAKE SWITCH
2006 QX56
STOP LAMP SWITCH
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
3. Check continuity between stop lamp

Page 1722 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P1572 ASCD BRAKE SWITCHEC-511
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Revision: November 2009 2006 QX56
DTC P1572 ASCD BRAKE SWITCHPFP:25320
Component DescriptionUBS00L13
When the brake pedal is depressed, ASCD

DTC P1572 ASCD BRAKE SWITCHEC-511
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Revision: November 2009 2006 QX56
DTC P1572 ASCD BRAKE SWITCHPFP:25320
Component DescriptionUBS00L13
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-29, "
AUTOMATIC SPEED CONTROL DEVICE (ASCD)"
for the ASCD function.
CONSULT-II Reference Value in Data Monitor ModeUBS00L14
Specification data are reference values.
On Board Diagnosis LogicUBS00L15
This self-diagnosis has the one trip detection logic.
The MIL will not light up for this diagnosis.
NOTE:
If DTC P 1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605.
Refer to EC-457, "
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.
BBIA0373E
MONITOR ITEM CONDITIONSPECIFICATION
BRAKE SW 1
(ASCD brake switch)
Ignition switch: ON Brake pedal: Fully released ON
Brake pedal: Slightly depressed OFF
BRAKE SW 2
(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
(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 1723 of 3383

INFINITI QX56 2006 Factory Service Manual EC-512Revision: November 2009
DTC P1572 ASCD BRAKE SWITCH
2006 QX56
DTC confirmation ProcedureUBS00L16
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been prev

Page 1724 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P1572 ASCD BRAKE SWITCHEC-513
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Revision: November 2009 2006 QX56
Wiring Diagram UBS00L17
BBWA1703E

Page 1725 of 3383

INFINITI QX56 2006 Factory Service Manual EC-514Revision: November 2009
DTC P1572 ASCD BRAKE SWITCH
2006 QX56
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals

Page 1726 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P1572 ASCD BRAKE SWITCHEC-515
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Revision: November 2009 2006 QX56
2. CHECK OVERALL FUNCTION-II
With CONSULT-II
Check “BRAKE SW2 ” indication in “DATA MONITOR ” mo

Page 1727 of 3383

INFINITI QX56 2006 Factory Service Manual EC-516Revision: November 2009
DTC P1572 ASCD BRAKE SWITCH
2006 QX56
3. CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch harness connector.
3. T

Page 1728 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P1572 ASCD BRAKE SWITCHEC-517
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Revision: November 2009 2006 QX56
7. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch

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