Nissan Maxima Service and Repair Manual: System description

  • Relay control system
  • System Diagram 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.

  • Power control system
  • System Diagram System Description COOLING FAN CONTROL IPDM E/R controls cooling fans according to the status of the cooling fan speed request signal received from ECM via CAN communication. GENERATOR CONTROL IPDM E/R outputs power generation command signal (PWM signal) to the generator according to the status of the power generation command value signal received from ECM via CAN communication. Refer to CHG-9, "System Description".

  • Signal buffer system
  • System Diagram System Description IPDM E/R reads the status of the oil pressure switch and transmits the oil pressure switch signal to BCM via CAN communication. IPDM E/R receives the rear window defogger status signal from BCM via CAN communication and transmits it to ECM via CAN communication.

  • Power consumption control system
  • System Diagram System Description OUTLINE IPDM E/R incorporates a power consumption control function that reduces the power consumption according to the vehicle status. IPDM E/R changes its status (control mode) with the sleep wake up signal received from BCM via CAN communication. Normal mode (wake-up) CAN communication is normally performed with other control units. Individual unit control by IPDM E/R is normally performed. Low power consumption mode (sleep) Low power consumption control is active. CAN transmission is stopped. SLEEP MODE ACTIVATION IPDM E/R judges that the sleep-ready conditions are fulfilled when the ignition switch is OFF and none of the conditions below are present.

  • Diagnosis system (IPDM E/R)
  • Diagnosis Description AUTO ACTIVE TEST Description In auto active test mode, the IPDM E/R sends a drive signal to the following systems to check their operation. Oil pressure warning lamp Front wiper (LO, HI) Parking lamps Side marker lamps License plate lamps Tail lamps Front fog lamps (if equipped) Headlamps (LO, HI) A/C compressor (magnet clutch) Cooling fans Operation Procedure Close the hood and lift the wiper arms from the windshield. (Prevent windshield damage due to wiper operation) NOTE: When auto active test is performed with hood opened, sprinkle water on windshield beforehand. Turn ignition switch OFF.

Power control system

Relay control system