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.

2002 Infiniti Q45FACTORY OEM SERVICE PROCEDURE

Rear Defogger Switch Does Not Work.

CHECK REAR DEFOGGER SWITCH INPUT SIGNAL
1. Turn ignition switch ON.
2. Check voltage between multifunction switch connector M83 terminal 5(G/R) and ground.
  
  Fig 1: Multifunction Switch Connector Terminal And Ground Voltage Specifications
  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.