PRE-CRASH SAFETY SYSTEM - Power Source Circuit

DESCRIPTION

This circuit supplies power to the seat belt control ECU when the ignition switch is ON.

Pre-Crash Safety System - Power Source Circuit. PRE-CRASH SAFETY. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Start the engine before inspection. Check the IG1 NO. 1 relay or battery if the starting system does not start.

1.INSPECT FUSE (ECU-IG No. 1, PSB)

Remove the ECU-IG No. 1 and PSB fuses from the main body ECU.

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

Standard Resistance:
Tester Connection Condition Specified Condition
ECU-IG No. 1 fuse Always Below 1 Ω
PSB fuse

REPLACE FUSE

OK

2.CHECK HARNESS AND CONNECTOR (SEAT BELT CONTROL ECU - BATTERY AND BODY GROUND)

Disconnect the E41 and E42 seat belt control ECU connectors.

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

Standard Voltage:
Tester Connection Switch Condition Specified Condition
E42-8 (IG1) - Body ground Ignition switch ON 11 to 14 V
Ignition switch off Below 1 V
E41-7 (+B) - Body ground Always 11 to 14 V

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

Standard Resistance:
Tester Connection Condition Specified Condition
E41-8 (PGND) - Body ground Always Below 1 Ω

REPLACE SEAT BELT CONTROL ECU ()

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE SEAT BELT CONTROL ECU ()