Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSINFINITI2008FX45 AWD V8-4.5L (VK45DE)REPAIR AND DIAGNOSISCRUISE CONTROLBRAKE SWITCH (CRUISE CONTROL)TESTING AND INSPECTIONASCD BRAKE SWITCH
2008 Infiniti FX45 AWD V8-4.5L (VK45DE)
ASCD Brake Switch
2008 Infiniti FX45 AWD V8-4.5L (VK45DE)SECTION ASCD Brake Switch
ASCD BRAKE SWITCH
Component Description
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 this input of two kinds (ON/OFF signal).
Refer to EC-615 for the ASCD function. Automatic Speed Control Device (ASCD)
CONSULT-III Reference Value in Data Monitor Mode
Wiring Diagram
Diagrams: Other diagrams referred to by name within these diagrams can be found at Diagrams By Diagram Name. Diagrams By Diagram Name
Diagnosis Procedure
Component Inspection
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.
4. If NG, adjust ASCD brake switch installation, refer to BR-5, Adjustments and perform step 3 again.
Component Description
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 this input of two kinds (ON/OFF signal).
Refer to EC-615 for the ASCD function. Automatic Speed Control Device (ASCD)
CONSULT-III Reference Value in Data Monitor Mode
Wiring Diagram
EC-ASCBOF-01:
Diagrams: Other diagrams referred to by name within these diagrams can be found at Diagrams By Diagram Name. Diagrams By Diagram Name
Diagnosis Procedure
Step 1-2:
Step 2 (Continued)-7:
Component Inspection
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.
4. If NG, adjust ASCD brake switch installation, refer to BR-5, Adjustments and perform step 3 again.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.