Pre-Collision Safety System

Power Source Circuit

DESCRIPTION
This circuit supplies power to the seat belt control ECU.

When the power switch is turned ON (IG), the D-IG1 relay turns ON and power is supplied to the main body ECU. Power is then supplied from the main body ECU to the luggage room junction block ECU, which then turns ON the L-IG1 relay to supply power to the seat belt control ECU.

HINT: There may be a malfunction in the power source circuit if either of the following occurs: 1) neither DTCs nor "normal system" codes are output but the pre-collision system is not functioning normally; or 2) DTCs are not output and a "normal system" code is output, but the pre-collision system is not functioning normally.

Wiring Diagram:

Step 1-2:

INSPECTION PROCEDURE

NOTE: When the seat belt control ECU is replaced with a new one, Active Test must be performed.