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10B-2 Body Electrical Control System:
CAN Communication System Description
CAN communication system uses the serial communication in which data is transmitted at a high speed. It uses a
twisted pair of two communication lines for the high-speed data transmission. As one of its characteristics, multiple
control modules can communicate simultaneously. In addition, it has a functionality to detect a communication error
automatically.
Each module reads necessary data from the received data and transmits data. BCM communicates with each control
module about the following information.
[A]: Data which BCM (1) transmits to ECM (2)
• Air conditioning switch signal
• Electric load (Rear end door window defogger switch signal)
• Ignition switch signal
[B]: Data which BCM receives from ECM
• Vehicle speed signal
• Engine coolant temperature signal
• Fuel consumption signal (Distance kilometers per liter of fuel)
[C]: Data which BCM transmits to TCM (A/T model) (3)
• "3" position switch signal ("2" or "3" range signal of A/T selector lever)
[D]: Data which BCM receives from TCM (A/T model)
• Transmission range sensor signal (A/T select lever position indicator)
[E]: Data which BCM transmits to combination meter (4)
• Brake fluid level switch signal
• Parking brake switch signal
• Driver side seat belt buckle switch signal
• Charging system warning lamp signal
• Engine oil pressure switch signal
• Lighting switch signal
• Door switch signal
4
1
[E]
2
[A]
[B]
[C]
[D]
S4RS0AA201002
3
I4RS0AA20032-
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