Infiniti FX35 / FX45. Manual - part 595

ASCD BRAKE SWITCH

EC-1141

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Diagnosis Procedure

INFOID:0000000001327042

1.

CHECK OVERALL FUNCTION-I

 With CONSULT-III

1.

Turn ignition switch ON.

2.

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

3.

Check “BRAKE SW1” indication under the following conditions.

 Without CONSULT-III

1.

Turn ignition switch ON.

2.

Check voltage between ECM terminal 108 and ground under the
following conditions.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

2.

CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ASCD brake switch harness connector.

3.

Turn ignition switch ON.

TER-

MI-

NAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

101

P/L

Stop lamp switch

[Ignition switch: OFF]
• Brake pedal: Fully released

Approximately 0V

[Ignition switch: OFF]
• Brake pedal: Slightly depressed

BATTERY VOLTAGE
(11 - 14V)

108

SB

ASCD brake switch

[Ignition switch: ON]
• Brake pedal: Slightly depressed

Approximately 0V

[Ignition switch: ON]
• Brake pedal: Fully released

BATTERY VOLTAGE
(11 - 14V)

CONDITION

INDICATION

Brake pedal: Slightly depressed

OFF

Brake pedal: Fully released

ON

CONDITION

VOLTAGE

Brake pedal: Slightly depressed

Approximately 0V

Brake pedal: Fully released

Battery voltage

MBIB0061E

PBIB2558E

EC-1142

< SERVICE INFORMATION >

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ASCD BRAKE SWITCH

4.

Check voltage between ASCD brake 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.
• Fuse block (J/B) connector E201
• 10A fuse
• Harness for open or short between ASCD brake switch and fuse

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

4.

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.

4.

Also check harness for short to ground or short to power.

OK or NG

OK

>> GO TO 6.

NG

>> GO TO 5.

5.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E211, M41
• Harness for open or short between ECM and ASCD brake switch

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

6.

CHECK ASCD BRAKE SWITCH

Refer to 

EC-1074, "Component Inspection"

 

OK or NG

OK

>> GO TO 7.

NG

>> Replace ASCD brake switch.

7.

CHECK INTERMITTENT INCIDENT

Refer to 

EC-717

.

>> INSPECTION END

Component Inspection

INFOID:0000000001327043

ASCD BRAKE SWITCH

1.

Turn ignition switch OFF.

2.

Disconnect ASCD brake switch harness connector.

Voltage: Battery voltage

PBIB0857E

Continuity should exist.

ASCD BRAKE SWITCH

EC-1143

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3.

Check harness continuity between ASCD brake switch terminals
1 and 2 under the following conditions.

4.

If NG, adjust ASCD brake switch installation, refer to 

BR-5

, and

perform step 3 again.

Condition

Continuity

Brake pedal: Fully released

Should exist

Brake pedal: Slightly depressed

Should not exist

PBIB1536E

EC-1144

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ASCD INDICATOR

ASCD INDICATOR

Component Description

INFOID:0000000001327044

ASCD indicator lamp illuminates to indicate ASCD operation status. Lamp has two indicators, CRUISE and
SET, and is integrated in combination meter.
CRUISE lamp illuminates when MAIN switch on ASCD steering switch is turned ON to indicated that ASCD
system is ready for operation.
SET lamp illuminates when following conditions are met. 
• CRUISE lamp is illuminated.
• SET/COAST switch on ASCD steering switch is turned ON while vehicle speed is within the range of ASCD

setting.

SET lamp remains lit during ASCD control.
Refer to 

EC-615

 for the ASCD function.

CONSULT-III Reference Value in Data Monitor Mode

INFOID:0000000001327045

Specification data are reference value.

MONITOR ITEM

CONDITION

SPECIFICATION

CRUISE LAMP

• Ignition switch: ON

MAIN switch: Pressed at the 1st time 

→

 

at the 2nd time

ON 

→

 OFF

SET LAMP

• MAIN switch: ON
• When vehicle speed is between 

40 km/h (25 MPH) and 144 km/h 
(89 MPH)

ASCD: Operating

ON

ASCD: Not operating

OFF