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