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: 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, Initialize must be performed Pre-Collision System.
* Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Disconnect the negative (-) terminal cable from the battery.





(b) Disconnect the seat belt control ECU connector.

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

(d) Measure the voltage according to the value (s) in the table below.

Standard voltage:





(e) Reconnect the seat belt control ECU connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - SEAT BELT CONTROL ECU)
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (GROUND CIRCUIT)

(a) Disconnect the negative (-) terminal cable from the battery.





(b) Disconnect the seat belt control ECU connector.

(c) Measure the resistance according to the value (s) in the table below.

Standard resistance:





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

(e) Reconnect the seat belt control ECU connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE SEAT BELT CONTROL ECU Removal