2008 INFINITI QX56 Factory Service Manual

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Page 1641 of 4083

INFINITI QX56 2008 Factory Service Manual EC-342
< COMPONENT DIAGNOSIS >[VK56DE]
P1572 ICC BRAKE SWITCH
5. Check 1st trip DTC.
6. If 1st trip DTC is detected, go to
EC-342, "
Diagnosis Procedure".
If 1st trip DTC is not detec ted, go to the

Page 1642 of 4083

INFINITI QX56 2008 Factory Service Manual P1572 ICC BRAKE SWITCHEC-343
< COMPONENT DIAGNOSIS > [VK56DE]
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Without CONSULT-IIl
Check voltage between ECM terminal 101 and ground under the fol-
lowing conditions.

Page 1643 of 4083

INFINITI QX56 2008 Factory Service Manual EC-344
< COMPONENT DIAGNOSIS >[VK56DE]
P1572 ICC BRAKE SWITCH
7.CHECK DTC WITH ICC UNIT
Refer to CCS-18
.
OK or NG
OK >> GO TO 8.
NG >> Repair or replace.
8.CHECK POWER SUPPLY CIRCUIT
1. Turn ignitio

Page 1644 of 4083

INFINITI QX56 2008 Factory Service Manual P1572 ICC BRAKE SWITCHEC-345
< COMPONENT DIAGNOSIS > [VK56DE]
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Check the following.
• Harness connectors M31, E152
• Fuse block (J/B) connector M60
• 10A fuse
•

Page 1645 of 4083

INFINITI QX56 2008 Factory Service Manual EC-346
< COMPONENT DIAGNOSIS >[VK56DE]
P1572 ICC BRAKE SWITCH
Component Inspection
INFOID:0000000001365772
ICC BRAKE SWITCH
1. Turn ignition switch OFF.
2. Disconnect ICC brake switch harness connecto

Page 1646 of 4083

INFINITI QX56 2008 Factory Service Manual P1572 ASCD BRAKE SWITCHEC-347
< COMPONENT DIAGNOSIS > [VK56DE]
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P1572 ASCD BRAKE SWITCH
Component DescriptionINFOID:0000000001528784
When the brake pedal is depressed,

P1572 ASCD BRAKE SWITCHEC-347
< COMPONENT DIAGNOSIS > [VK56DE]
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P1572 ASCD BRAKE SWITCH
Component DescriptionINFOID:0000000001528784
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-33, "
System Description" for the ASCD function.
On Board Diagnosis LogicINFOID:0000000001528786
•This self-diagnosis has the one trip detection logic.
• The MIL will not light up for this self-diagnosis.
NOTE:
• If DTC P 1572 is displayed with DTC P0605, first pe rform the trouble diagnosis for DTC P0605. Refer
to EC-291, "
On Board Diagnosis Logic".
• 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 ma lfunction A is detected in two
consecutive trips, DTC is not stored in ECM memory.
DTC Confirmation ProcedureINFOID:0000000001528787
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 procedure for malfunction A, the incident that causes malfunction B can be
detected.
TESTING CONDITION:
Steps 4 and 5 may be conducted with the drive wheels li fted in the shop or by driving the vehicle. If a
road test is expected to be easier, it is unnecessary to lift the vehicle.
WITH CONSULT-III
1. Start engine (VDC switch OFF).
2. Select “DATA MONITOR” mode with CONSULT-III.
3. Press MAIN switch and make sure that CRUISE indicator lights up.
4. Drive the vehicle for at least 5 consecutive seconds under the following condition.
BBIA0373E
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 vehicle is
driving
Revision: March 2010
2008 QX56

Page 1647 of 4083

INFINITI QX56 2008 Factory Service Manual EC-348
< COMPONENT DIAGNOSIS >[VK56DE]
P1572 ASCD BRAKE SWITCH
5. Check 1st trip DTC.
6. If 1st trip DTC is detected, go to
EC-348, "
Diagnosis Procedure".
If 1st trip DTC is not detec ted, go to the

Page 1648 of 4083

INFINITI QX56 2008 Factory Service Manual P1572 ASCD BRAKE SWITCHEC-349
< COMPONENT DIAGNOSIS > [VK56DE]
C
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Without CONSULT-III
Check voltage between ECM terminal 101 and ground under the following conditions.
OK

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