2009 NISSAN LATIO Service Repair Manual

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Page 2785 of 4331

NISSAN LATIO 2009 Service Repair Manual DTC P1572 ASCD BRAKE SWITCH
EC-1429
< SERVICE INFOMATION >
[MR TYPE 2] C
D E
F
G H
I
J
K L
M A EC
NP
O
DTC P1572 ASCD BRAKE SWITCH
Component Description INFOID:0000000004500308
When the brake pedal

DTC P1572 ASCD BRAKE SWITCH
EC-1429
< SERVICE INFOMATION >
[MR TYPE 2] C
D E
F
G H
I
J
K L
M A EC
NP
O
DTC P1572 ASCD BRAKE SWITCH
Component Description INFOID:0000000004500308
When the brake pedal is depressed, ASCD brake switch (2) is
turned OFF and stop lamp switch (1) is turned ON. ECM detects the
state of the brake pedal by this input of two kinds (ON/OFF signal).
Refer to EC-1033 for the ASCD function.
CONSULT-III Reference Val ue in Data Monitor Mode INFOID:0000000004500309
Specification data are reference values.
On Board Diagnosis Logic INFOID:0000000004500310
This self-diagnosis has the on e trip detection logic.
The MIL will not light up for this diagnosis.
NOTE:
• If DTC P1572 is displayed with DT C P0605, first perform the trouble diagnosis for DTC P0605. Refer
to EC-1393 .
• 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. BBIA0708E
MONITOR ITEM CONDITION SPECIFICATION
BRAKE SW1
(ASCD brake switch) • Ignition switch: ON• Brake pedal: Fully released (A/T, CVT)
• Brake pedal and clutch pedal: Fully re- leased (M/T) ON
• Brake pedal: Slightly depressed (A/T, CVT)
• Brake pedal and/or clutch pedal: Slight- ly depressed (M/T) OFF
BRAKE SW2
(Stop lamp switch) • Ignition switch: ONBrake 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
(Stop lamp switch circuit is shorted.)
• Harness or connectors (ASCD brake switch circuit is shorted.)
• Harness or connectors
(ASCD clutch switch circuit is shorted.)
(M/T)
• Stop lamp switch
• ASCD brake switch
• ASCD clutch switch (M/T)
• Incorrect stop lamp switch installation
• Incorrect ASCD brake switch installation
• Incorrect ASCD clutch switch installation (M/T)
• ECM
B)
ASCD brake switch signal is not sent to ECM
for extremely long time while the vehicle is
driving

Page 2786 of 4331

NISSAN LATIO 2009 Service Repair Manual Diagnosis Procedure " .
If 1st trip DTC is not detec ted, go to the following step.
6. Drive the vehicle for at least 5 consecutive seconds under the following condition.
7. Check 1st trip DTC.
8. If

Page 2787 of 4331

NISSAN LATIO 2009 Service Repair Manual DTC P1572 ASCD BRAKE SWITCH
EC-1431
< SERVICE INFOMATION >
[MR TYPE 2] C
D E
F
G H
I
J
K L
M A EC
NP
O
Wiring Diagram
INFOID:0000000004500312
Specification data are reference values and are measured

Page 2788 of 4331

NISSAN LATIO 2009 Service Repair Manual EC-1432< SERVICE INFOMATION >
[MR TYPE 2]
DTC P1572 ASCD BRAKE SWITCH
Diagnosis Procedure INFOID:00000000045003131.
CHECK OVERALL FUNCTION-I
With CONSULT-III
1. Turn ignition switch ON.
2. Select “

Page 2789 of 4331

NISSAN LATIO 2009 Service Repair Manual DTC P1572 ASCD BRAKE SWITCH
EC-1433
< SERVICE INFOMATION >
[MR TYPE 2] C
D E
F
G H
I
J
K L
M A EC
NP
O
Without CONSULT-III
Check voltage between ECM terminal 99 and ground under the fol-
lo

Page 2790 of 4331

NISSAN LATIO 2009 Service Repair Manual EC-1434< SERVICE INFOMATION >
[MR TYPE 2]
DTC P1572 ASCD BRAKE SWITCH
2. Disconnect ASCD brake switch (2) harness connector.
- Stop lamp switch (1)
3. Turn ignition switch ON.
4. Check voltage betwe

Page 2791 of 4331

NISSAN LATIO 2009 Service Repair Manual DTC P1572 ASCD BRAKE SWITCH
EC-1435
< SERVICE INFOMATION >
[MR TYPE 2] C
D E
F
G H
I
J
K L
M A EC
NP
O
OK or NG OK >> GO TO 15.
NG >> Replace ASCD brake switch. 9.
CHECK ASCD CLUTCH SWITCH INPUT SIGNA

Page 2792 of 4331

NISSAN LATIO 2009 Service Repair Manual EC-1436< SERVICE INFOMATION >
[MR TYPE 2]
DTC P1572 ASCD BRAKE SWITCH
• Harness for open or short between stop lamp switch and battery >> Repair open circuit or short to ground or short to power in

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