2011 NISSAN TIIDA brake light

DTC P1572 ASCD BRAKE SWITCHEC-931
< SERVICE INFORMATION > [MR18DE]
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DTC P1572 ASCD BRAKE SWITCH
Component DescriptionINFOID:0000000006342129
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-523
for the ASCD function.
CONSULT-III Reference Val ue in Data Monitor ModeINFOID:0000000006342130
Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000006342131
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-895
.
• 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.
BBIA0708E
Monitor item ConditionSpecification
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
Revision: May 2010
2011 Versa

EC-932
< SERVICE INFORMATION >[MR18DE]
DTC P1572 ASCD BRAKE SWITCH
DTC Confirmation Procedure
INFOID:0000000006342132
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
• If DTC Confirmation Procedure has been previously conducted, 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 3 and 6 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.
2. Press MAIN switch and make sure that CRUISE indicator lights up.
3. Drive the vehicle for at least 5 consecutive seconds under the following condition.
4. Check 1st trip DTC.
5. If 1st trip DTC is detected, go to EC-934, "
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 1st trip DTC is detected, go to EC-934, "
Diagnosis Procedure".
WITH GST
Follow the procedure “WITH CONSULT-III” above.
Vehicle speed More than 30 km/h (19 MPH)
Shift lever Suitable position
Vehicle speed More than 30 km/h (19 MPH)
Shift lever Suitable position
Driving location Depress the brake pedal for more than 5
seconds so as not to come off from the
above-mentioned vehicle speed.
Revision: May 2010
2011 Versa

EC-934
< SERVICE INFORMATION >[MR18DE]
DTC P1572 ASCD BRAKE SWITCH
Diagnosis Procedure
INFOID:0000000006342134
1.CHECK OVERALL FUNCTION-I
With CONSULT-III
1. Turn ignition switch ON.
2. Select “BRAKE SW1” in “DAT A MONITOR” mode with CONSULT-III.
3. Check “BRAKE SW1” indication under the following conditions.
M/T models
A/T and CVT models
Without CONSULT-III
1. Turn ignition switch ON.
2. Check voltage between ECM terminal 100 and ground under the
following conditions.
M/T models
A/T and CVT models
OK or NG
OK >> GO TO 2.
NG (M/T models) >>GO TO 3.
NG (A/T and CVT models) >>GO TO 4.
2.CHECK OVERALL FUNCTION-II
With CONSULT-III
Check “BRAKE SW2” indication in “DATA MONITOR” mode.
TERMI-
NAL NO. WIRE
COLOR ITEM
CONDITION DATA (DC Voltage)
99 R Stop lamp switch [Ignition switch: ON]
• Brake pedal: Fully released
Approximately 0 V
[Ignition switch: ON]
• Brake pedal: Slightly depressed BATTERY VOLTAGE
(11 - 14 V)
100 G ASCD brake switch • Brake pedal: Slightly depressed (A/T, CVT)
• Brake pedal and/or clutch pedal: Slightly de-
pressed (M/T) Approximately 0 V
• Brake pedal: Fully released (A/T, CVT)
• Brake pedal and clutch pedal: Fully released (M/T) BATTERY VOLTAGE
(11 - 14 V)
Condition Indication
Clutch pedal and/or brake pedal: Slightly depressed OFF
Clutch pedal and brake pedal: Fully released ON
Condition Indication
Brake pedal: Slightly depressed OFF
Brake pedal: Fully released ON
Condition Voltage
Clutch pedal and/or brake pedal: Slightly depressed Approximately 0 V
Clutch pedal and brake pedal: Fully released Battery voltage
Condition Voltage
Brake pedal: Slightly depressed Approximately 0 V
Brake pedal: Fully released Battery voltage
PBIB3315E
Revision: May 2010 2011 Versa

DTC P1572 ASCD BRAKE SWITCHEC-935
< SERVICE INFORMATION > [MR18DE]
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Without CONSULT-III
Check voltage between ECM terminal 99 and ground under the fol-
lowing conditions.
OK or NG
OK >> GO TO 15.
NG >> GO TO 11.
3.CHECK ASCD CLUTCH SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ASCD clutch switch (1) harness connector.
- Clutch pedal (2)
3. Turn ignition switch ON.
4. Check voltage between ASCD clutch switch terminal 1 and ground under the following conditions with CONSULT-III or
tester.
OK or NG
OK >> GO TO 9.
NG >> GO TO 4.
4.CHECK ASCD BRAKE SWITCH POWER SUPPLY
1. Turn ignition switch OFF.
Condition Indication
Brake pedal: Fully released OFF
Brake pedal: Slightly depressed ON
ConditionVoltage
Brake pedal: Fully released Approximately 0 V
Brake pedal: Slightly depressed Battery voltage
PBIB0311E
BBIA0709E
ConditionVoltage
Brake pedal: Fully released Battery voltage
Brake pedal: Slightly depressed Approx. 0 V
PBIB0857E
Revision: May 2010 2011 Versa

EC-938
< SERVICE INFORMATION >[MR18DE]
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 harness or connectors.
13.CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 99 and stop lamp switch terminal 2. Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 14.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
14.CHECK STOP LAMP SWITCH
Refer to EC-938, "
Component Inspection"
OK or NG
OK >> GO TO 15.
NG >> Replace stop lamp switch.
15.CHECK INTERMITTENT INCIDENT
Refer to EC-632
.
>> INSPECTION END
Component InspectionINFOID:0000000006342135
ASCD BRAKE SWITCH
1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch harness connector.
3. Check continuity between ASCD brake switch terminals 1 and 2
under the following conditions.
If NG, adjust ASCD brake switch installation, refer to BR-6
, and
perform step 3 again.
ASCD CLUTCH SWITCH
1. Turn ignition switch OFF.
2. Disconnect ASCD clutch switch harness connector. Continuity should exist.
Condition
Continuity
Brake pedal: Fully released. Should exist.
Brake pedal: Slightly depressed. Should not exist.
SEC023D
Revision: May 2010 2011 Versa

DTC P1572 ASCD BRAKE SWITCHEC-939
< SERVICE INFORMATION > [MR18DE]
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3. Check continuity between ASCD clutch switch terminals 1 and 2
under the following conditions.
If NG, adjust ASCD clutch switch installation, refer to CL-6
, and
perform step 3 again.
STOP LAMP SWITCH
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
3. Check continuity between stop lamp switch terminals 1 and 2 under the following conditions.
If NG, adjust stop lamp switch installation, refer to BR-6
, and perform step 3 again.
ConditionContinuity
Clutch pedal: Fully released. Should exist.
Clutch pedal: Slightly depressed. Should not exist.
SEC023D
ConditionContinuity
Brake pedal: Fully released. Should not exist.
Brake pedal: Slightly depressed. Should exist.
PBIB3318E
Revision: May 2010 2011 Versa

EC-944
< SERVICE INFORMATION >[MR18DE]
DTC P1805 BRAKE SWITCH
DTC P1805 BRAKE SWITCH
DescriptionINFOID:0000000006342149
Brake switch signal is applied to the ECM through the stop lamp switch when the brake pedal is depressed.
This signal is used mainly to decrease the engine speed when the vehicle is driving.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000006342150
Specification data are reference values.
On Board Diagn
osis LogicINFOID:0000000006342151
The MIL will not light up for this self-diagnosis.
FA I L - S A F E M O D E
When the malfunction is detected, the ECM enters in fail-safe mode.
DTC Confirmation ProcedureINFOID:0000000006342152
1. Turn ignition switch ON.
2. Fully depress the brake pedal for at least 5 seconds.
3. Erase the DTC.
4. Check 1st trip DTC.
5. If 1st trip DTC is detected, go to EC-946, "
Diagnosis Procedure".
Monitor item Condition Specification
BRAKE SW • Ignition switch: ON Brake pedal: Fully released
OFF
Brake pedal: Slightly depressed ON
DTC No. Trouble diagnosis nameDTC detecting condition Possible cause
P1805
1805 Brake switch A brake switch signal is not sent to ECM for
extremely long time while the vehicle is driv-
ing. • Harness or connectors
(Stop lamp switch circuit is open or shorted.)
• Stop lamp switch
Engine operation condition in fail-fail safe mode
ECM controls the electric throttle control actuator by regulating the throttle opening to a small range.
Therefore, acceleration will be poor.
Vehicle condition Driving condition
Engine: Idling Normal
Accelerating Poor acceleration
Revision: May 2010 2011 Versa

EC-946
< SERVICE INFORMATION >[MR18DE]
DTC P1805 BRAKE SWITCH
Diagnosis Procedure
INFOID:0000000006342154
1.CHECK STOP LAMP SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Check the stop lamp when depressing and releasing the brake pedal.
OK or NG
OK >> GO TO 4.
NG >> GO TO 2.
2.CHECK STOP LAMP SWIT CH POWER SUPPLY CIRCUIT
1. Disconnect stop lamp switch (1) harness connector.
- Brake pedal (2)
2. Check voltage between stop lamp switch terminal 1 and ground with CONSULT-III or tester.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
3.DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors M69, E7
• 10 A fuse
• Harness for open and short between stop lamp switch and battery
TERMI- NAL NO. WIRE
COLOR ITEM
CONDITION DATA (DC Voltage)
99 R Stop lamp switch [Ignition switch: OFF]
• Brake pedal: Fully released
Approximately 0 V
[Ignition switch: OFF]
• Brake pedal: Slightly depressed BATTERY VOLTAGE
(11 - 14 V)
Brake pedal Stop lamp
Fully released Not illuminated
Slightly depressed Illuminated
BBIA0710E
Voltage: Battery voltage
PBIB3317E
Revision: May 2010 2011 Versa