WARNING: This page is about a different car, the 2008 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

Intelligent Key Unit

INTELLIGENT KEY UNIT - INPUT/OUTPUT SIGNAL CHART

Switch/Input signal	Input signal to Intelligent Key unit	Intelligent Key unit function	Actuator/Output signal
Key switch	Mechanical key (insert/remove)	Engine start function	KEY warning lamp/buzzer Steering lock unit Starter relay request (to IPDM E/R) Inside key antenna (Front and rear center console, overhead console, luggage compartment) Key interlock solenoid
Ignition knob switch	Ignition knob (push/release)
Steering lock unit	Steering lock (lock/unlock)
Inside key antenna (Front and rear center console, overhead console, luggage compartment)	Intelligent key (inside antenna detection area or not.)

IPDM E/R

IPDM E/R - INPUT/OUTPUT SIGNAL CHART

Switch/Input signal	Input signal to IPDM E/R	IPDM E/R function	Actuator/Output signal
Park/neutral position switch	P, N range	Engine start function	Starter relay Starter motor

BCM

BCM - INPUT/OUTPUT SIGNAL CHART

Switch/Input signal	Input signal to BCM	BCM function	Actuator/Output signal
Key switch	Brake (press/release)	Engine start function	Inside key antenna (Front and rear center console, overhead console, luggage compartment)

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.

Safety Warning

Input/Output Signal Chart

Use the Manual With the Right Hardware

When to See a Mechanic