2008 INFINITI FX35 Service Manual

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Page 2305 of 3924

INFINITI FX35 2008 Service Manual
DTC P1572 ICC BRAKE SWITCHEC-1065
< SERVICE INFORMATION > [VK45DE]
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4. Check voltage between ICC brake switch terminal 1 and ground
with CONSULT-III or tester.
OK or NG

Page 2306 of 3924

INFINITI FX35 2008 Service Manual
EC-1066
< SERVICE INFORMATION >[VK45DE]
DTC P1572 ICC BRAKE SWITCH
Refer to
EC-1067, "Component Inspection".
OK >> GO TO 17.
NG >> Replace ICC brake hold relay.
12.CHECK STOP LAMP SWITCH POWER SUPPL

Page 2307 of 3924

INFINITI FX35 2008 Service Manual
DTC P1572 ICC BRAKE SWITCHEC-1067
< SERVICE INFORMATION > [VK45DE]
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16.CHECK STOP LAMP SWITCH
Refer to EC-1067, "
Component Inspection"
OK or NG
OK >> GO TO 17.
NG >>

Page 2308 of 3924

INFINITI FX35 2008 Service Manual
EC-1068
< SERVICE INFORMATION >[VK45DE]
DTC P1572 ASCD BRAKE SWITCH
DTC P1572 ASCD BRAKE SWITCH
Component DescriptionINFOID:0000000001326942
When the brake pedal is depressed, ASCD brake switch is tu

EC-1068
< SERVICE INFORMATION >[VK45DE]
DTC P1572 ASCD BRAKE SWITCH
DTC P1572 ASCD BRAKE SWITCH
Component DescriptionINFOID:0000000001326942
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-615
for the ASCD function.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000001326943
Specification data are reference values.
On Board Diagn osis LogicINFOID:0000000001326944
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 pe rform the trouble diagnosis for DTC P0605. Refer
to EC-1007
.
This self-diagnosis has the one tr ip 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 igniti on switch OFF. And even when ma lfunction A is detected in two
consecutive trips, DTC is not stored in ECM memory.
DTC Confirmation ProcedureINFOID:0000000001326945
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously conduc ted, 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 procedur e for malfunction A, the incident that causes malfunction B can be
detected.
PBIB2558E
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 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 ve-
hicle is driving.
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

Page 2309 of 3924

INFINITI FX35 2008 Service Manual
DTC P1572 ASCD BRAKE SWITCHEC-1069
< SERVICE INFORMATION > [VK45DE]
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TESTING CONDITION:
Steps 4 and 5 may be conducted with the drive wheels li
fted in the shop or by d

Page 2310 of 3924

INFINITI FX35 2008 Service Manual
EC-1070
< SERVICE INFORMATION >[VK45DE]
DTC P1572 ASCD BRAKE SWITCH
Wiring Diagram
INFOID:0000000001326946
Specification data are reference values and are measured between each terminal and ground.
C

Page 2311 of 3924

INFINITI FX35 2008 Service Manual
DTC P1572 ASCD BRAKE SWITCHEC-1071
< SERVICE INFORMATION > [VK45DE]
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Diagnosis ProcedureINFOID:0000000001326947
1.CHECK OVERALL FUNCTION-I
With CONSULT-III
1. Turn ign

Page 2312 of 3924

INFINITI FX35 2008 Service Manual
EC-1072
< SERVICE INFORMATION >[VK45DE]
DTC P1572 ASCD BRAKE SWITCH
OK or NG
OK >> GO TO 13.
NG >> GO TO 8.
3.CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect A

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