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Power Source Circuit





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

NOTICE:
When the seat belt control ECU is replaced with a new one, Initialization 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 seat belt control ECU connectors.

(c) Connect the negative (-) terminal cable to the battery.

(d) Measure the voltage of the wire harness side connector.

Standard voltage:





(e) Reconnect the seat belt control ECU connectors.

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) Disconnect the seat belt control ECU connector.

(c) Measure the resistance of the wire harness side connector.

Standard resistance:





(d) Connect the cable to the negative (-) battery terminal.

(e) Reconnect the seat belt control ECU connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE SEAT BELT CONTROL ECU Removal