2013 Infiniti QX56 AWDFACTORY OEM SERVICE PROCEDURE

Can Communication Control

When CAN communication with ECM and BCM is impossible, IPDM E/R performs fail-safe control. After CAN communication recovers normally, it also returns to normal control.

If No CAN Communication Is Available With ECM

Control part Fail-safe operation
Cooling fan
  • Transmits the pulse duty signal (PWM signal) 100% when the ignition switch is turned ON.
  • Transmits the pulse duty signal (PWM signal) 0% when the ignition switch is turned OFF.
A/C compressor A/C relay OFF
Alternator Transmits the power generation command signal (PWM signal) 0%

If No CAN Communication Is Available With BCM

Control part Fail-safe operation
Headlamp
  • Turns ON the headlamp low relay when the ignition switch is turned ON
  • Turns OFF the headlamp low relay when the ignition switch is turned OFF
  • Headlamp high relay OFF
  • Parking lamp
  • License plate lamp
  • Illumination
  • Tail lamp
  • Side marker lamp
  • Turns ON the tail lamp relay when the ignition switch is turned ON
  • Turns OFF the tail lamp relay when the ignition switch is turned OFF
Front wiper motor
  • The status just before activation of fail-safe control is maintained until the ignition switch is turned OFF while the front wiper is operating at LO or HI speed.
  • The wiper is operated at LO speed until the ignition switch is turned OFF if the fail-safe control is activated while the front wiper is set in the INT mode and the front wiper motor is operating.
  • Return automatically wiper to stop position when ignition switch is turned ON if fail-safe control is activated while front wiper motor is operated and wiper stops in the other position than stop position.
Front fog lamp Front fog lamp relay OFF
Horn Horn OFF
Ignition relay The status just before activation of fail-safe is maintained.
Starter motor Starter control relay OFF
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.