2013 Infiniti QX56 AWDFACTORY OEM SERVICE PROCEDURE

RELAY CONTROL SYSTEM: System Description

IPDM E/R activates the internal control circuit to perform the relay ON-OFF control according to the input signals from various sensors and the request signals received from control units via CAN communication.

CAUTION: IPDM E/R integrated relays cannot be removed.
Control relay Input/output Transmit unit Control part Refer to
  • Headlamp low relay
  • Headlamp high relay
  • Low beam request signal
  • High beam request signal
 BCM (CAN)
  • Headlamp (LO)
  • Headlamp (HI)
 SYSTEM
Front fog lamp relay Front fog light request signal BCM (CAN) Front fog lamp FRONT FOG LAMP SYSTEM
Tail lamp relay Position light request signal BCM (CAN)
  • Parking lamp
  • License plate lamp
  • Tail lamp
  • Side marker lamp
 HIGH FLASHER OPERATION
Illuminations SYSTEM
  • Front wiper relay
  • Front wiper high relay
 Front wiper request signal BCM (CAN) Front wiper motor "FRONT WIPER AND WASHER SYSTEM: SYSTEM DIAGRAM "
Front wiper stop position signal Front wiper motor
Rear window defogger relay Rear window defogger control signal BCM (CAN) Rear window defogger "SYSTEM DIAGRAM "
  • Horn relay
  • Theft warning horn relay
  • Theft warning horn request signal
  • Horn reminder signal
 BCM (CAN) Horn (high) Horn (low) VEHICLE SECURITY SYSTEM
  • Starter relayNOTE
  • Starter control relay
 Starter control relay signal BCM (CAN) Starter motor PUSH-BUTTON IGNITION SWITCH , PUSH-BUTTON IGNITION SWITCH
Starter relay control signal TCM
A/C relay A/C compressor request signal ECM (CAN) A/C compressor (Magnet clutch) FRONT AUTOMATIC AIR CONDITIONING SYSTEM: AIR OUTLET CONTROL
Headlamp washer relay Headlamp washer request signal BCM (CAN) Headlamp washer pump "HEADLAMP WASHER SYSTEM: SYSTEM DIAGRAM "
  • Ignition relay
  • Ignition relay-2
  • Ignition relay-3
 Ignition switch ON signal BCM (CAN) Each control unit, sensor, actuator and relay (ignition power supply) B2098 IGNITION RELAY ON STUCK 
Vehicle speed signal Combination meter (CAN)
Push-button ignition switch signal Push-button ignition switch
NOTE: BCM controls the starter relay.
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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.