Nissan Pathfinder (2012 year). Manual - part 283

P1564 ASCD STEERING SWITCH

EC-345

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

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2. Loosen and retighten three ground screws on the body. Refer to 

EC-97, "Ground Inspection"

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2.

CHECK ASCD STEERING SWITCH CIRCUIT

 With CONSULT

1. Turn ignition switch ON.

2. Select “MAIN SW”, “CANCEL SW”, “RESUME/ACC SW” and “SET SW” in “DATA MONITOR” mode with

CONSULT.

3. Check each item indication under the following conditions.

 Without CONSULT

1. Turn ignition switch ON.

2. Check voltage between ECM terminal 99 and ground with press-

ing each button.

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 3.

3.

CHECK ASCD STEERING SWITCH GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Disconnect combination switch harness connector.

BBIA0539E

Switch Monitor 

item

Condition

Indication

MAIN switch

MAIN SW

Pressed

ON

Released

OFF

CANCEL switch

CANCEL SW

Pressed

ON

Released

OFF

RESUME/ACCELER-
ATE switch

RESUME/ACC SW

Pressed

ON

Released

OFF

SET/COAST switch

SET SW

Pressed

ON

Released

OFF

Switch

Condition

Voltage [V]

MAIN switch

Pressed

Approx. 0

Released

Approx. 4

CANCEL switch

Pressed

Approx. 1

Released

Approx. 4

RESUME/ACCELERATE 
switch

Pressed

Approx. 3

Released

Approx. 4

SET/COAST switch

Pressed

Approx. 2

Released

Approx. 4

PBIB0311E

August 2012

2012 Pathfinder

EC-346

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

P1564 ASCD STEERING SWITCH

3. Disconnect ECM harness connector.

4. Check harness continuity between combination switch terminal 15 and ECM terminal 67. Refer to Wiring

Diagram.

5. Also check harness for short to ground and short to power.
OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors M31, E152

• Harness connectors E5, F14

• Combination switch (spiral cable)

• Harness for open and short between ECM and combination switch

>> Repair open circuit or short to ground or short to power in harness or connectors.

5.

CHECK ASCD STEERING SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Check harness continuity between ECM terminal 99 and combination switch terminal 14.

Refer to Wiring Diagram.

2. Also check harness for short to ground and short to power.
OK or NG

OK

>> GO TO 7.

NG

>> GO TO 6.

6.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors M31, E152

• Combination switch (spiral cable)

• Harness for open and short between ECM and combination switch

>> Repair open circuit or short to ground or short to power in harness or connectors.

7.

CHECK ASCD STEERING SWITCH

Refer to 

EC-346, "Component Inspection"

.

OK or NG

OK

>> GO TO 8.

NG

>> Replace steering switch. Refer to 

ST-20, "Removal and Installation"

.

8.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-37, "Intermittent Incident"

.

>>

INSPECTION END

Component Inspection

INFOID:0000000007358298

ASCD STEERING SWITCH

1. Disconnect combination switch (spiral cable).

Continuity should exist.

Continuity should exist.

August 2012

2012 Pathfinder

P1564 ASCD STEERING SWITCH

EC-347

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2. Check continuity between combination switch (spiral cable) ter-

minals 14 and 15 with pushing each switch.

Switch

Condition

Resistance [

Ω

]

MAIN switch

Pressed

Approx. 0

Released

Approx. 4,000

CANCEL switch

Pressed

Approx. 250

Released

Approx. 4,000

RESUME/ACCELERATE 
switch

Pressed

Approx. 1,480

Released

Approx. 4,000

SET/COAST switch

Pressed

Approx. 660

Released

Approx. 4,000

JMBIA1066GB

August 2012

2012 Pathfinder

EC-348

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

P1572 ASCD BRAKE SWITCH

P1572 ASCD BRAKE SWITCH

Component Description

INFOID:0000000007358299

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 those two types of input (ON/OFF signal).

Refer to 

EC-53, "System Description"

 for the ASCD function.

On Board Diagnosis Logic

INFOID:0000000007358300

This self-diagnosis has the one trip detection logic.

The MIL will not illuminate for this diagnosis.

NOTE:

•

If DTC P 1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer

to 

EC-309

.

•

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 is turn OFF. And even when malfunction A is detected in

two consecutive trips, DTC is not stored in ECM memory.

DTC Confirmation Procedure

INFOID:0000000007358301

CAUTION:

Always drive vehicle at a safe speed.

NOTE:

• The procedure for malfunction B is not described. It takes an extremely long time to complete the procedure

for malfunction B. By performing the procedure for malfunction A, the condition that causes malfunction B

can be detected. 

• If DTC Confirmation Procedure has been previously conducted, always perform the following before con-

ducting the next step.

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON.

3. Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:

Steps 4 and 5 may be conducted with the drive wheels lifted 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

1. Start engine (VDC switch OFF).
2. Select “DATA MONITOR” mode with CONSULT.
3. Press MAIN switch and make sure that CRUISE indicator illuminates.

BBIA0560E

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 
being driven

August 2012

2012 Pathfinder

P1572 ASCD BRAKE SWITCH

EC-349

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

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4. Drive the vehicle for at least 5 consecutive seconds under the following condition.

5. Check 1st trip DTC.

If DTC is detected, go to 

EC-349, "Diagnosis Procedure"

.

If DTC is not detected, 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 DTC is detected, go to 

EC-349, "Diagnosis Procedure"

.

 WITH GST

Follow the procedure “WITH CONSULT” above.

Diagnosis Procedure

INFOID:0000000007358302

1.

CHECK OVERALL FUNCTION-I

 With CONSULT

1. Turn ignition switch ON.

2. Select “BRAKE SW1” in “DATA MONITOR” mode with CONSULT.

3. Check “BRAKE SW1” indication under the following conditions.

 Without CONSULT

1. Turn ignition switch ON.

2. Check voltage between ECM terminal 108 and ground under the

following conditions.

OK or NG

OK

>> GO TO 2.

NG

>> GO TO 3.

2.

CHECK OVERALL FUNCTION-II

 With CONSULT

Check “BRAKE SW2” indication in “DATA MONITOR” mode. 

 Without CONSULT

VHCL SPEED SE

More than 30 km/h (19 MPH)

Selector lever

Suitable position 

VHCL SPEED SE

More than 30 km/h (19 MPH)

Selector lever

Suitable position 

Driving location

Depress the brake pedal for more than 
five seconds so as not to come off from 
the above-mentioned vehicle speed.

CONDITION

INDICATION

When brake pedal: Slightly depressed

OFF

When brake pedal: Fully released

ON

CONDITION

VOLTAGE

When brake pedal: Slightly depressed

Approximately 0V

When brake pedal: Fully released

Battery voltage

MBIB0061E

CONDITION

INDICATION

When brake pedal: Fully released

OFF

When brake pedal: Slightly depressed

ON

August 2012

2012 Pathfinder

EC-350

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

P1572 ASCD BRAKE SWITCH

Check voltage between ECM terminal 101 and ground under the following conditions.

OK or NG

OK

>> GO TO 11.

NG

>> GO TO 7.

3.

CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect ASCD brake switch harness connector.

3. Turn ignition switch ON.

4. Check voltage between ASCD brake switch terminal 1 and

ground with CONSULT or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.

• Fuse block (J/B) connector E160

• 10 A fuse (No.12)

• Harness for open or short between ASCD brake switch and fuse

>> Repair open circuit or short to ground in harness or connectors.

5.

CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check harness continuity between ECM terminal 108 and ASCD brake switch terminal 2.

Refer to Wiring Diagram.

CONDITION

VOLTAGE

When brake pedal: Fully released

Approximately 0V

When brake pedal: Slightly depressed

Battery voltage

MBIB0060E

BBIA0560E

Voltage: Battery voltage

PBIB0857E

Continuity should exist.

August 2012

2012 Pathfinder

P1572 ASCD BRAKE SWITCH

EC-351

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

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4. Also check harness for short to ground and short to power.
OK or NG

OK

>> GO TO 6.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

6.

CHECK ASCD BRAKE SWITCH

Refer to 

EC-352, "Component Inspection"

.

OK or NG

OK

>> GO TO 11.

NG

>> Replace ASCD brake switch. Refer to 

BR-23, "Removal and Installation"

.

7.

CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect stop lamp switch harness connector.

3. Check voltage between stop lamp switch terminal 1 and ground

with CONSULT or tester.

OK or NG

OK

>> GO TO 9.

NG

>> GO TO 8.

8.

DETECT MALFUNCTIONING PART

Check the following.

• Fuse block (J/B) connector E160

• 10 A fuse (No.20)

• 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.

9.

CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Disconnect ECM harness connector.

2. Check harness continuity between ECM terminal 101 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 10.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

10.

CHECK STOP LAMP SWITCH

BBIA0560E

Voltage: Battery voltage

PBIB1184E

Continuity should exist.

August 2012

2012 Pathfinder

EC-352

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

P1572 ASCD BRAKE SWITCH

Refer to 

EC-352, "Component Inspection"

.

OK or NG

OK

>> GO TO 11.

NG

>> Replace stop lamp switch. Refer to 

BR-23, "Removal and Installation"

.

11.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-37, "Intermittent Incident"

.

>>

INSPECTION END

Component Inspection

INFOID:0000000007358303

ASCD BRAKE SWITCH

1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch harness connector.
3. Check harness continuity between ASCD brake switch terminals

1 and 2 under the following conditions.

If NG, adjust ASCD brake switch installation, refer to 

BR-17,

"Inspection and Adjustment - Standard Pedal"

and perform step

3 again.

STOP LAMP SWITCH

1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
3. Check harness continuity between stop lamp switch terminals 1

and 2 under the following conditions.

If NG, adjust stop lamp switch installation, refer to 

BR-17,

"Inspection and Adjustment - Standard Pedal"

, and perform step

3 again.

Condition

Continuity

When brake pedal: Fully released.

Should exist.

When brake pedal: Slightly depressed.

Should not exist.

SEC023D

Condition

Continuity

When brake pedal: Fully released.

Should not exist.

When brake pedal: Slightly depressed.

Should exist.

PBIB1185E

August 2012

2012 Pathfinder