There is a case that Toyota handheld tester cannot be used when ECU is abnormal Wiring Diagram

FL Block No. 1

DC/DC

Ignition Switch

Block No. 2 MAIN

Battery

ECU-IG

IG1 Relay

Instrument Panel J/B

Brake ECU

J11 J/C

ID IE

8

B11

GND3

17

GND4

31

-HB10

GND1

6

GND2

F12678

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