2009 INFINITI QX56 Factory Service Manual

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Page 1657 of 4171

INFINITI QX56 2009 Factory Service Manual
EC-330
< COMPONENT DIAGNOSIS >[VK56DE]
P1564 ASCD STEERING SWITCH
2. Disconnect combination switch harness connector M102.
3. Disconnect ECM harness connector.
4. Check harness continuity between com

Page 1658 of 4171

INFINITI QX56 2009 Factory Service Manual
P1564 ASCD STEERING SWITCHEC-331
< COMPONENT DIAGNOSIS > [VK56DE]
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2. Check continuity between combination switch (spiral cable) ter-
minals 14 and 15 with pushing each

Page 1659 of 4171

INFINITI QX56 2009 Factory Service Manual
EC-332
< COMPONENT DIAGNOSIS >[VK56DE]
P1568 ICC FUNCTION
P1568 ICC FUNCTION
On Board Diagn
osis LogicINFOID:0000000003771635
This self-diagnosis has the one trip detection logic.
The MIL will n

Page 1660 of 4171

INFINITI QX56 2009 Factory Service Manual
P1572 ICC BRAKE SWITCHEC-333
< COMPONENT DIAGNOSIS > [VK56DE]
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P1572 ICC BRAKE SWITCH
Component DescriptionINFOID:0000000003771638
When the brake pedal is depressed, IC

P1572 ICC BRAKE SWITCHEC-333
< COMPONENT DIAGNOSIS > [VK56DE]
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P1572 ICC BRAKE SWITCH
Component DescriptionINFOID:0000000003771638
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
CCS-13
for the ICC function.
On Board Diagnosis LogicINFOID:0000000003771639
This diagnosis has the on e 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-282, "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 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:0000000003771640
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
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.
If DTC Confirmation Procedure has been previously c onducted, always perform the following before con-
ducting the next step.
1. Turn ignition swich OFF and wait at least 10 seconds.
2. Turn ignition swich ON.
3. Turn ignition swich OFF and wait at least 10 seconds.
TESTING CONDITION:
Steps 4 and 7 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.
1. Start engine (VDC switch OFF).
2. Select “DATA MONITOR” mode with CONSULT-IIl.
3. Press MAIN switch and make sure that CRUISE lamp lights up.
4. Drive the vehicle for at least 5 consec utive seconds under the following conditions.
BBIA0470E
DTC No.Trouble diagnosis
name DTC detecting condition Possible cause
P1572
1572 ICC brake switch A)
When vehicle speed is above 30 km/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
(The stop lamp switch circuit is shorted.)
Harness or connectors
(The 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
Revision: December 20092009 QX56

Page 1661 of 4171

INFINITI QX56 2009 Factory Service Manual
EC-334
< COMPONENT DIAGNOSIS >[VK56DE]
P1572 ICC BRAKE SWITCH
5. Check 1st trip DTC.
6. If 1st trip DTC is detected, go to
EC-334, "Diagnosis Procedure"
.
If 1st trip DTC is not detec ted, go to the

Page 1662 of 4171

INFINITI QX56 2009 Factory Service Manual
P1572 ICC BRAKE SWITCHEC-335
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Check voltage between ECM terminal 101 and ground under the fol-
lowing conditions.
OK or NG
OK >> GO TO

Page 1663 of 4171

INFINITI QX56 2009 Factory Service Manual
EC-336
< COMPONENT DIAGNOSIS >[VK56DE]
P1572 ICC BRAKE SWITCH
Refer to
CCS-18.
OK or NG
OK >> GO TO 8.
NG >> Repair or replace.
8.CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnec

Page 1664 of 4171

INFINITI QX56 2009 Factory Service Manual
P1572 ICC BRAKE SWITCHEC-337
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Fuse block (J/B) connector M60
10A fuse
Harness for open or short between stop lamp switch and batt

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