Can Communication Line Control

WARNING: This page is about a different car, the 2007 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

With CAN communication, by connecting each control unit using two communication lines (CAN-L line, CAN-H line), it is possible to transmit a maximum amount of information with minimum wiring. Each control unit can transmit and receive data, and reads necessary information only.

Fail-safe control
- When CAN communication with other control units is impossible, IPDM E/R performs fail-safe control. After CAN communication returns to normal operation, it also returns to normal control.
- Operation of control parts by IPDM E/R during fail-safe mode is as follows:

FAIL-SAFE CONTROL CHART

Controlled system	Fail-safe mode
Headlamp	With the ignition switch ON, the headlamp low relay is ON. With the ignition switch OFF, the headlamp low relay is OFF. With the ignition switch ON or OFF, the headlamp high relay is OFF.
Tail and parking lamps	With the ignition switch ON, the tail lamp relay is ON. With the ignition switch OFF, the tail lamp relay is OFF.
Controlled system	Fail-safe mode
Cooling fan	With the ignition switch ON, cooling fan relay 1 and 3 are ON and cooling fan operates at high speed. With the ignition switch OFF, all cooling relays are OFF.
Front wiper	Until the ignition switch is turned off, the front relays remain in the same status they were in just before fail-safe control was initiated.
Rear window defogger	Rear window defogger relay is OFF.
A/C compressor	A/C relay is OFF (magnet clutch is OFF).
Front fog lamps	Front fog lamp relay is OFF.
Horn	Horn relay is OFF.
Cornering lamps	Cornering lamp relays are OFF.
Daytime lights (Canada only)	With the ignition switch ON, daytime light output is activated (front fog lamp relay is ON). With the ignition switch OFF, daytime light output is OFF (front fog lamp relay is OFF).