Toyota 4Runner: Terminals Of Ecu

Toyota 4Runner Service Manual / Vehicle Interior / Seat / Front Power Seat Control System(w/ Memory) / Terminals Of Ecu

TERMINALS OF ECU

1. CHECK FRONT POWER SEAT SWITCH LH

(a) Disconnect the b18 and b19 connectors from the front power seat switch LH.

(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
b18-2 (GND1) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
b18-7 (+B1) - b18-2 (GND1)	W - W-B	Power source	Always	11 to 14 V
b19-12 (SYSB) - b18-2 (GND1)	P - W-B	System power source	Always	11 to 14 V

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

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
b18-3 (SLD+) - b18-2 (GND1)	L - W-B	Sliding motor signal (forward)	Slide switch off	Below 1 V
b18-3 (SLD+) - b18-2 (GND1)	L - W-B	Sliding motor signal (forward)	Slide switch on (Forward)	11 to 14 V
b18-4 (SLD-) - b18-2 (GND1)	GR - W-B	Sliding motor signal (rearward)	Slide switch off	Below 1 V
b18-4 (SLD-) - b18-2 (GND1)	GR - W-B	Sliding motor signal (rearward)	Slide switch on (Rearward)	11 to 14 V
b18-5 (FRV-) - b18-2 (GND1)	R - W-B	Front vertical motor signal (downward)	Front vertical switch off	Below 1 V
b18-5 (FRV-) - b18-2 (GND1)	R - W-B	Front vertical motor signal (downward)	Front vertical switch on (Downward)	11 to 14 V
b18-6 (+B2) - b18-1 (GND2)	SB - W-B	Power source	Always	11 to 14 V
b18-8 (FRV+) - b18-2 (GND1)	B - W-B	Front vertical motor signal (upward)	Front vertical switch off	Below 1 V
b18-8 (FRV+) - b18-2 (GND1)	B - W-B	Front vertical motor signal (upward)	Front vertical switch on (Upward)	11 to 14 V
b18-9 (RCL+) - b18-2 (GND1)	P - W-B	Reclining motor signal (forward)	Reclining switch off	Below 1 V
b18-9 (RCL+) - b18-2 (GND1)	P - W-B	Reclining motor signal (forward)	Reclining switch on (Forward)	11 to 14 V
b18-11 (RCL-) - b18-2 (GND1)	LG - W-B	Reclining motor signal (rearward)	Reclining switch off	Below 1 V
b18-11 (RCL-) - b18-2 (GND1)	LG - W-B	Reclining motor signal (rearward)	Reclining switch on (Rearward)	11 to 14 V
b18-10 (LFT+) - b18-2 (GND1)	V - W-B	Lifter motor signal (upward)	Lifter switch off	Below 1 V
b18-10 (LFT+) - b18-2 (GND1)	V - W-B	Lifter motor signal (upward)	Lifter switch on (Upward)	11 to 14 V
b18-12 (LFT-) - b18-2 (GND1)	G - W-B	Lifter motor signal (downward)	Lifter switch off	Below 1 V
b18-12 (LFT-) - b18-2 (GND1)	G - W-B	Lifter motor signal (downward)	Lifter switch on (Downward)	11 to 14 V
b19-1 (SGND) - b18-2 (GND1)	BR - W-B	Ground	Always	Below 1 Ω
b19-3 (SSFV) - b19-1 (SGND)	R - BR	Front vertical position signal	Front vertical function operating	4.5 to 4.8 V
b19-4 (SSRL) - b19-1 (SGND)	P - BR	Lifter position signal	Lifter function operating	4.5 to 4.8 V
b19-5 (SSRS) - b19-1 (SGND)	G- BR	Slide position signal	Slide function operating	4.5 to 4.8 V
b19-11 (SSRR) - b19-1 (SGND)	V - BR	Reclining position signal	Reclining function operating	4.5 to 4.8 V

If the result is not as specified, the front power seat switch LH may have a malfunction.

2. 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	-	Power source	Always	11 to 14 V
A-32 (IG) - Body ground	-	Power source (IG)	Engine switch on (IG)	11 to 14 V
A-32 (IG) - Body ground	-	Power source (IG)	Engine 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

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

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