2008 INFINITI FX35 Service Manual

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Page 1705 of 3924

INFINITI FX35 2008 Service Manual
DTC P1572 ICC BRAKE SWITCHEC-465
< SERVICE INFORMATION > [VQ35DE]
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DTC P1572 ICC BRAKE SWITCH
Component DescriptionINFOID:0000000001326330
When the brake pedal is depre

DTC P1572 ICC BRAKE SWITCHEC-465
< SERVICE INFORMATION > [VQ35DE]
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DTC P1572 ICC BRAKE SWITCH
Component DescriptionINFOID:0000000001326330
When the brake pedal is depressed, ICC 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
ACS-7
for the ICC function.
CONSULT-III Reference Val ue in Data Monitor ModeINFOID:0000000001326331
Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000001326332
This self-diagnosis has the one trip detection logic.
The MIL will not light up for this self-diagnosis.
NOTE:
If DTC P1572 is displayed with DT C P0605, first perform the trouble diagnosis for DTC P0605. Refer
to EC-422
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 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:0000000001326333
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.
PBIB1539E
MONITOR ITEM CONDITION SPECIFICATION
BRAKE SW1
(ICC 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 ICC brake switch A)
When the vehicle speed is above 30km/h (19
MPH), ON signals from the stop lamp switch
and the ICC brake switch are sent to ECM at
the same time. Harness or connectors
(Stop lamp switch circuit is shorted.)
Harness or connectors (ICC brake switch circuit is shorted.)
Stop lamp switch
ICC brake switch
ICC brake hold relay
Incorrect stop lamp switch installation
Incorrect ICC brake switch installation
ECM
B)
ICC brake switch signal is not sent to ECM
for extremely long time while the vehicle is
driving
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

Page 1706 of 3924

INFINITI FX35 2008 Service Manual
EC-466
< SERVICE INFORMATION >[VQ35DE]
DTC P1572 ICC BRAKE SWITCH
Procedure for malfunction B is not described here. It
takes extremely long time to complete procedure for
malfunction B. By perfor

Page 1707 of 3924

INFINITI FX35 2008 Service Manual
DTC P1572 ICC BRAKE SWITCHEC-467
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Wiring DiagramINFOID:0000000001326334
Specification data are reference values
and are measured betwe

Page 1708 of 3924

INFINITI FX35 2008 Service Manual
EC-468
< SERVICE INFORMATION >[VQ35DE]
DTC P1572 ICC BRAKE SWITCH
Diagnosis Procedure
INFOID:0000000001326335
1.CHECK OVERALL FUNCTION-I
With CONSULT-III
1. Turn ignition switch ON.
2. Select “BRA

Page 1709 of 3924

INFINITI FX35 2008 Service Manual
DTC P1572 ICC BRAKE SWITCHEC-469
< SERVICE INFORMATION > [VQ35DE]
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Check voltage between ECM terminal 101 and ground under the fol-
lowing conditions.
OK or NG
OK >> GO

Page 1710 of 3924

INFINITI FX35 2008 Service Manual
EC-470
< SERVICE INFORMATION >[VQ35DE]
DTC P1572 ICC BRAKE SWITCH
2. Disconnect ICC brake switch harness connector.
3. Turn ignition switch ON.
4. Check voltage between ICC brake switch terminal 1 an

Page 1711 of 3924

INFINITI FX35 2008 Service Manual
DTC P1572 ICC BRAKE SWITCHEC-471
< SERVICE INFORMATION > [VQ35DE]
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OK or NG
OK >> GO TO 11.
NG >> GO TO 10.
10.DETECT MALFUNCTIONING PART
Check the following.
Harness

Page 1712 of 3924

INFINITI FX35 2008 Service Manual
EC-472
< SERVICE INFORMATION >[VQ35DE]
DTC P1572 ICC BRAKE SWITCH
OK or NG
OK >> GO TO 16.
NG >> GO TO 15.
15.DETECT MALFUNCTIONING PART
Check the following.
Harness connectors E211, M41
Harness

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