Can Communication System: Fail-Safe

WARNING: This page is about a different car, the 2007 Lexus GX 470. However, it is still accessible from the selected car via links, so may be relevant.

FAIL-SAFE FUNCTION

When communication fails in any of the CAN bus lines (communication lines) due to a short circuit or any other causes, the fail-safe function, which is specified for each system, operates to prevent the system from malfunctioning.
This function operates for each system when communication is impossible. (For further details, see the information for each system.)

FAIL-SAFE TABLE

Function	ECM	Skid Control ECU	Steering Angle Sensor	Yaw Rate Sensor	Action when unable to communicate	DTC detection (Driver detectable)
VSC Control (Controls VSC/TRC engine output)	-	Rx	Tx	Tx	VSC function stops	Detectable (Light comes on)
VSC Control (Controls VSC/ TRC engine output)	Rx or Tx	Tx or Rx	-	-	VSC function stops	Detectable (Light comes on)

HINT:

Rx: Reception from each ECU (sensor).
Tx: Transmission to each ECU (sensor).