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 a 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 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 REFERENCE CHART
     
     

     Controlled system	Fail-safe mode
     Headlamp	With the ignition switch ON, headlamp low relay is ON, headlamp high relays are OFF, and daytime light system (Canada only) is OFF. With the ignition switch OFF, the headlamp relays are OFF.
     Tail, license plate 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.
     Cooling fan	With the ignition switch ON, cooling fan relay-1, relay-2, and relay-3 are ON. With the ignition switch OFF, all cooling fan relays are OFF.
     Front wiper	Until the ignition switch is turned off, the front wiper relays remain in the same status they were in just before fail-safe control was initiated.
     Rear window defogger	Rear window defogger relay OFF
     A/C compressor	A/C relay is OFF
     Front fog lamps (if equipped)	Front fog lamp relay OFF