Can Communication Line Control

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

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

     Controlled system	Fail-safe mode
     Headlamps	With the ignition switch ON, the headlamp low relay is ON. With the ignition switch OFF, the headlamp low relay is OFF.
     Tail, parking and license plate lamps	With the ignition switch ON, the tail lamp relay is ON. With the ignition switch OFF, the tail lamp relay is OFF.
     Cooling fan	With the ignition switch ON, the cooling fan HI operates. With the ignition switch OFF, the cooling fan stops.
     Front wiper	Until the ignition switch is turned off, the front wiper LO and HI remains in the same status it was in just before fail-safe control was initiated.
     Rear window defogger	Rear window defogger relay OFF
     A/C compressor	A/C relay OFF
     Front fog lamps	Front fog lamp relay OFF