Nissan Maxima Service and Repair Manual: 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. Then it transmits a sleep-ready signal (ready) to BCM via CAN communication.

• Front wiper fail-safe operation
• Outputting signals to actuators
• Switches or relays operating
• Auto active test is starting
• Emergency OFF
• Output requests are being received from control units via CAN communication.

• IPDM E/R stops CAN communication and enters the low power consumption mode when it receives a sleep wake up signal (sleep) from BCM and the sleep-ready conditions are fulfilled.

WAKE-UP OPERATION

• IPDM E/R changes from the low power consumption mode to the normal mode when it receives a sleep wake-up signal (wake up) from BCM or any of the following conditions is fulfilled. In addition, it transmits a sleep-ready signal (not-ready) to BCM via CAN communication to report the CAN communication start.

• Ignition switch ON
• An output request is received from a control unit via CAN communication.

Component Parts Location

1. BCM M16, M17, M18, M19, M20, M21 (view with instrument panel removed)
2. Combination meter M24
3. IPDM E/R E16, E17, E18, E200, E201, F10