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.

2004 Infiniti QX56 AWDFACTORY OEM SERVICE PROCEDURE

ASCD Brake Switch

Turn ignition switch OFF.
Disconnect ASCD brake switch harness connector.

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

CHECKING HARNESS CONTINUITY CONDITION

Condition	Continuity
When brake pedal is fully released.	Should exist.
When brake pedal is depressed.	Should not exist.

If NG, adjust ASCD brake switch installation, refer to BRAKE PEDAL , and perform step 3 again.

Fig 1: Checking Harness Continuity Between ASCD Brake Switch Terminals 1 & 2

Courtesy of NISSAN MOTOR CO., U.S.A.

Factory Service Tools

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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.