Terminals Of Ecu

CHECK MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)

Fig 1: Identifying Main Body ECU (Instrument Panel Junction Block) Connector Terminals (1 Of 2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Identifying Main Body ECU (Instrument Panel Junction Block) Connector Terminals (2 Of 2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the 4A, 4B, 4D, 4E and F38 main body ECU (instrument panel junction block) connectors.

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

RESISTANCE AND VOLTAGE SPECIFICATION

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
4E-17 (GND1) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
4B-30 (BECU) - Body ground	L - Body ground	Power source	Always	11 to 14 V
4A-21 (DCTY) - Body ground	R - Body ground	Front door courtesy light switch LH signal	Switch pushed (Door closed)	10 kΩ or higher
4A-21 (DCTY) - Body ground	R - Body ground	Front door courtesy light switch LH signal	Switch not pushed (Door open)	Below 1 Ω
4D-7 (KSW) - Body ground	Y - Body ground	Key unlock warning switch signal	No key is in ignition key cylinder	10 kΩ or higher
4D-7 (KSW) - Body ground	Y - Body ground	Key unlock warning switch signal	Key is in ignition key cylinder	Below 1 Ω
F38-23 (CANH) - F38-22 (CANL)	R - W	CAN communication line	Ignition switch OFF	54 to 69 Ω
F38-23 (CANH) - 4E-17 (GND1)	R - W-B	CAN communication line	Ignition switch OFF	200 Ω or higher
F38-22 (CANL) - 4E-17 (GND1)	W - W-B	CAN communication line	Ignition switch OFF	200 Ω or higher

HINT:

If the result is not as specified, the ECU may have a malfunction.