Pre-Collision System

PRE-COLLISION: PRE-COLLISION SYSTEM: Power Source Circuit

Power Source Circuit

DESCRIPTION

This circuit supplies 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





INSPECTION PROCEDURE
NOTE: When the seat belt control ECU is replaced with a new one, Active Test must be performed Pre-Collision System.

PROCEDURE

1. CHECK WIRE HARNESS (POWER SOURCE CIRCUIT)





(a) Disconnect the negative (-) terminal cable from the battery.
(b) Disconnect the V42 and V43 ECU connectors.
(c) Connect the negative (-) terminal cable to the battery.
(d) Measure the voltage of the wire harness side connector.
Standard voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
2. CHECK WIRE HARNESS (GROUND CIRCUIT)





(a) Disconnect the negative (-) terminal cable from the battery.
(b) Measure the resistance of the wire harness side connector.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE SEAT BELT CONTROL ECU