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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.

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. INSPECT FUSE (PSB)
(a) Remove the PSB fuse from the main body ECU LH (cowl side junction block LH).
(b) Measure the resistance according to the value (s) in the table below.
Standard Resistance:






NG -- REPAIR OR REPLACE FUSE
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
(a) Disconnect the cable from the negative (-) battery terminal.
CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
NOTICE: When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.





(b) Disconnect the Q38 connector of the seat belt control ECU.
(c) Connect the cable to the negative (-) battery terminal.
(d) Measure the voltage according to the value (s) in the table below.
Standard Voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (GROUND CIRCUIT)
(a) Disconnect the cable from the negative (-) battery terminal.
CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
NOTICE: When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.





(b) Measure the resistance according to the value (s) in the table below.
Standard Resistance:






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