FRONT POWER SEAT CONTROL SYSTEM (w/ Memory) TERMINALS OF ECU

CHECK FRONT POWER SEAT SWITCH (for LHD)

Disconnect the b4 and b5 connectors from the front power seat switch LH.

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
b4-1 (GND2) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
b4-2 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
b4-6 (+B2) - b4-1 (GND2)	SB - W-B	Power source	Always	11 to 14 V
b4-7 (+B) - b4-2 (GND)	W - W-B	Power source	Always	11 to 14 V
b5-12 (SYSB) - b4-2 (GND)	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.

Reconnect the b4 and b5 switch connectors.

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
b4-3 (SLD+) - b4-2 (GND)	L - W-B	Sliding motor signal (forward)	Slide switch off	Below 1 V
b4-3 (SLD+) - b4-2 (GND)	L - W-B	Sliding motor signal (forward)	Slide switch on (Forward)	11 to 14 V
b4-4 (SLD-) - b4-2 (GND)	GR - W-B	Sliding motor signal (rearward)	Slide switch off	Below 1 V
b4-4 (SLD-) - b4-2 (GND)	GR - W-B	Sliding motor signal (rearward)	Slide switch on (Rearward)	11 to 14 V
b4-5 (FRV-) - b4-2 (GND)	R - W-B	Front vertical motor signal (downward)	Front vertical switch off	Below 1 V
b4-5 (FRV-) - b4-2 (GND)	R - W-B	Front vertical motor signal (downward)	Front vertical switch on (Downward)	11 to 14 V
b4-8 (FRV+) - b4-2 (GND)	B - W-B	Front vertical motor signal (upward)	Front vertical switch off	Below 1 V
b4-8 (FRV+) - b4-2 (GND)	B - W-B	Front vertical motor signal (upward)	Front vertical switch on (Upward)	11 to 14 V
b4-9 (RCL+) - b4-2 (GND)	P - W-B	Reclining motor signal (forward)	Reclining switch off	Below 1 V
b4-9 (RCL+) - b4-2 (GND)	P - W-B	Reclining motor signal (forward)	Reclining switch on (Forward)	11 to 14 V
b4-11 (RCL-) - b4-2 (GND)	LG - W-B	Reclining motor signal (rearward)	Reclining switch off	Below 1 V
b4-11 (RCL-) - b4-2 (GND)	LG - W-B	Reclining motor signal (rearward)	Reclining switch on (Rearward)	11 to 14 V
b4-10 (LFT+) - b4-2 (GND)	V - W-B	Lifter motor signal (upward)	Lifter switch off	Below 1 V
b4-10 (LFT+) - b4-2 (GND)	V - W-B	Lifter motor signal (upward)	Lifter switch on (Upward)	11 to 14 V
b4-12 (LFT-) - b4-2 (GND)	G - W-B	Lifter motor signal (downward)	Lifter switch off	Below 1 V
b4-12 (LFT-) - b4-2 (GND)	G - W-B	Lifter motor signal (downward)	Lifter switch on (Downward)	11 to 14 V
b5-1 (SGND) - b4-2 (GND)	BR - W-B	Ground	Always	Below 1 Ω
b5-3 (SSFV) - b5-1 (SGND)	R - BR	Front vertical position signal	Front vertical function operating	4.5 to 4.8 V
b5-4 (SSRL) - b5-1 (SGND)	P - BR	Lifter position signal	Lifter function operating	4.5 to 4.8 V
b5-5 (SSRS) - b5-1 (SGND)	G- BR	Slide position signal	Slide function operating	4.5 to 4.8 V
b5-11 (SSRR) - b5-1 (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 may have a malfunction.

CHECK FRONT POWER SEAT SWITCH (for RHD)

Disconnect the a4 and a5 connectors from the front power seat switch RH.

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
a4-1 (GND2) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
a4-2 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
a4-6 (+B2) - a4-1 (GND2)	SB - W-B	Power source	Always	11 to 14 V
a4-7 (+B) - a4-2 (GND)	W - W-B	Power source	Always	11 to 14 V
a5-12 (SYSB) - a4-2 (GND)	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.

Reconnect the a4 and a5 switch connectors.

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
a4-3 (SLD+) - a4-2 (GND)	L - W-B	Sliding motor signal (forward)	Slide switch off	Below 1 V
a4-3 (SLD+) - a4-2 (GND)	L - W-B	Sliding motor signal (forward)	Slide switch on (Forward)	11 to 14 V
a4-4 (SLD-) - a4-2 (GND)	GR - W-B	Sliding motor signal (rearward)	Slide switch off	Below 1 V
a4-4 (SLD-) - a4-2 (GND)	GR - W-B	Sliding motor signal (rearward)	Slide switch on (Rearward)	11 to 14 V
a4-5 (FRV-) - a4-2 (GND)	R - W-B	Front vertical motor signal (downward)	Front vertical switch off	Below 1 V
a4-5 (FRV-) - a4-2 (GND)	R - W-B	Front vertical motor signal (downward)	Front vertical switch on (Downward)	11 to 14 V
a4-8 (FRV+) - a4-2 (GND)	B - W-B	Front vertical motor signal (upward)	Front vertical switch off	Below 1 V
a4-8 (FRV+) - a4-2 (GND)	B - W-B	Front vertical motor signal (upward)	Front vertical switch on (Upward)	11 to 14 V
a4-9 (RCL+) - a4-2 (GND)	P - W-B	Reclining motor signal (forward)	Reclining switch off	Below 1 V
a4-9 (RCL+) - a4-2 (GND)	P - W-B	Reclining motor signal (forward)	Reclining switch on (Forward)	11 to 14 V
a4-11 (RCL-) - a4-2 (GND)	LG - W-B	Reclining motor signal (rearward)	Reclining switch off	Below 1 V
a4-11 (RCL-) - a4-2 (GND)	LG - W-B	Reclining motor signal (rearward)	Reclining switch on (Rearward)	11 to 14 V
a4-10 (LFT+) - a4-2 (GND)	V - W-B	Lifter motor signal (upward)	Lifter switch off	Below 1 V
a4-10 (LFT+) - a4-2 (GND)	V - W-B	Lifter motor signal (upward)	Lifter switch on (Upward)	11 to 14 V
a4-12 (LFT-) - a4-2 (GND)	G - W-B	Lifter motor signal (downward)	Lifter switch off	Below 1 V
a4-12 (LFT-) - a4-2 (GND)	G - W-B	Lifter motor signal (downward)	Lifter switch on (Downward)	11 to 14 V
a5-1 (SGND) - a4-2 (GND)	BR - W-B	Ground	Always	Below 1 Ω
a5-3 (SSFV) - a5-1 (SGND)	R - BR	Front vertical position signal	Front vertical function operating	4.5 to 4.8 V
a5-4 (SSRL) - a5-1 (SGND)	P - BR	Lifter position signal	Lifter function operating	4.5 to 4.8 V
a5-5 (SSRS) - a5-1 (SGND)	G - BR	Slide position signal	Slide function operating	4.5 to 4.8 V
a5-11 (SSRR) - a5-1 (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 may have a malfunction.

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

Text in Illustration
*A	for LHD	*B	for RHD

Remove the main body ECU Click here.

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)	Ignition switch ON	11 to 14 V
A-32 (IG) - Body ground	-	Power source (IG)	Ignition switch off	Below 1 V
A-11 (GND) - Body ground	-	Body ground	Always	Below 1 Ω
G63-3 (GND2) - Body ground	W-B - Body ground	Body ground	Always	Below 1 Ω

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

Install the main body ECU Click here.

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
G63-25 (M1) - Body ground	SB - Body ground	Memory switch M1 signal	Memory switch M1 off	Pulse generation (See waveform 1 or 2)
G63-25 (M1) - Body ground	SB - Body ground	Memory switch M1 signal	Memory switch M1 on	Below 1 V
G63-26 (MM) - Body ground	LG - Body ground	Memory switch SET signal	Memory switch SET off	Pulse generation (See waveform 1 or 2)
G63-26 (MM) - Body ground	LG - Body ground	Memory switch SET signal	Memory switch SET on	Below 1 V
G63-27 (M2) - Body ground	V - Body ground	Memory switch M2 signal	Memory switch M2 off	Pulse generation (See waveform 1 or 2)
G63-27 (M2) - Body ground	V - Body ground	Memory switch M2 signal	Memory switch M2 on	Below 1 V
2I-27 (FLCY) - Body ground*1	R - Body ground	Front door courtesy light switch LH signal	Front door LH closed	11 to 14 V
2I-27 (FLCY) - Body ground*1	R - Body ground	Front door courtesy light switch LH signal	Front door LH open	Below 1 V
2H-26 (FRCY) - Body ground*2	B - Body ground	Front door courtesy light switch RH signal	Front door RH closed	11 to 14 V
2H-26 (FRCY) - Body ground*2	B - Body ground	Front door courtesy light switch RH signal	Front door RH open	Below 1 V

*1: for LHD
*2: for RHD

Using an oscilloscope, check waveform 1.

Waveform 1 (Reference)
Item	Content
Terminal No. (Symbol)	G63-25 (M1) - Body ground G63-26 (MM) - Body ground G63-27 (M2) - Body ground
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	Memory switch M1 off Memory switch SET off Memory switch M2 off

Using an oscilloscope, check waveform 2.

Waveform 2 (Reference)
Item	Content
Terminal No. (Symbol)	G63-25 (M1) - Body ground G63-26 (MM) - Body ground G63-27 (M2) - Body ground
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	Memory switch M1 off Memory switch SET off Memory switch M2 off