Toyota 4Runner: Terminals Of Ecu

Toyota 4Runner Service Manual / Vehicle Interior / Door Lock / Key Reminder Warning System / Terminals Of Ecu

TERMINALS OF ECU

1. CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

(a) Remove the main body ECU (multiplex network body ECU) (See page ).

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
A-30 (BECU) - Body ground	-	Battery power supply	Always	11 to 14 V
A-31 (ALTB) - Body ground	-	Battery power supply	Always	11 to 14 V
A-32 (IG) - Body ground	-	Ignition switch power supply	Ignition switch ON	11 to 14 V
A-32 (IG) - Body ground	-	Ignition switch power supply	Ignition switch off	Below 1 V
A-29 (ACC) - Body ground	-	ACC power supply	Ignition switch ACC	11 to 14 V
A-29 (ACC) - Body ground	-	ACC power supply	Ignition switch off	Below 1 V
A-11 (GND1) - Body ground	-	Ground	Always	Below 1 Ω
F10-3 (GND2) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
F9-17 (KSW) - Body ground	B - Body ground	Unlock warning switch input	No key in ignition key cylinder	10 kΩ or higher
F9-17 (KSW) - Body ground	B - Body ground	Unlock warning switch input	Key inserted in ignition key cylinder	Below 1 Ω

If the result is not as specified, there may be a malfunction in the wire harness.

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
2F-27 (FLCY) - Body ground	R - Body ground	Front door LH courtesy switch input	Front door LH open	Below 1 V
2F-27 (FLCY) - Body ground	R - Body ground	Front door LH courtesy switch input	Front door LH closed	11 to 14 V

If the result is not as specified, the main body ECU (multiplex network body ECU) or driver side junction block assembly may have a malfunction.

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