REAR POWER SEAT CONTROL SYSTEM(for Third Row) TERMINALS OF ECU

CHECK FOLD SEAT CONTROL ECU (RH SEAT)

Disconnect the k3 and k4 fold seat control ECU (RH seat) connectors.

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
k4-2 (+B) - Body ground	W - Body ground	Battery power supply	Always	11 to 14 V
k4-1 (IND1) - Body ground	B - Body ground	Battery power supply	Always	11 to 14 V
k3-1 (ECUB) - Body ground	W - Body ground	System power source	Always	11 to 14 V
k3-3 (IG) - Body ground	B - Body ground	IG switch signal	Engine switch off	Below 1 V
k3-3 (IG) - Body ground	B - Body ground	IG switch signal	Engine switch on (IG)	11 to 14 V
k4-10 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
k4-9 (GND2) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
k3-40 (IND2) - Body ground	W-B - Body ground	System ground	Always	Below 1 Ω

Reconnect the k3 and k4 fold seat control ECU (RH seat) connectors.
Measure the resistance and voltage according to the value(s) in the table below.

Using an oscilloscope, check the waveform.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
k4-4 (FLD+) - Body ground	L - Body ground	Lifter motor operation signal (Fold)	Fold switch (RH) of fold seat switch assembly or No. 1 fold seat switch assembly released → pushed (Fold operation)	Below 1 V → 11 to 14 V
k4-8 (FLD-) - Body ground	SB - Body ground	Lifter motor operation signal (Return)	Return switch (RH) of fold seat switch assembly or No. 1 fold seat switch assembly released → pushed (Return operation)	Below 1 V → 11 to 14 V
k3-11 (SV1) - k3-8 (SG1)	R - G	Lifter motor position sensor power source	Engine switch off → Engine switch on (IG)	Below 1 V → 5.5 to 10 V
k3-10 (SFLD) - k3-8 (SG1)	P - G	Lifter motor position sensor signal	Lifter motor (RH) operating (Fold/return operation)	Pulse generation (Hi: 5.5 to 10 V, Lo: Below 1 V)
k3-8(SG1) - Body ground	G - Body ground	Lifter motor position sensor ground	Always	Below 1 Ω
k4-3 (RCL+) - Body ground	L - Body ground	Reclining motor operation signal (Fold)	Fold switch (RH) of fold seat switch assembly or No. 1 fold seat switch assembly released → pushed (Fold operation)	Below 1 V → 11 to 14 V
k4-7 (RCL-) - Body ground	SB - Body ground	Reclining motor operation signal (Fold)	Return switch (RH) of fold seat switch assembly or No. 1 fold seat switch assembly released → pushed (Return operation)	Below 1 V → 11 to 14 V
k3-31 (SV2) - k3-28 (SG2)	R - G	Reclining motor position sensor power source	Engine switch off → Engine switch on (IG)	Below 1 V → 5.5 to 10 V
k3-9 (SRCL) - k3-28 (SG2)	P - G	Reclining motor position sensor signal	Reclining motor (RH) operating (Fold/return operation)	Pulse generation (Hi: 5.5 to 10 V, Lo: Below 1 V)
k3-28 (SG2) - Body ground	G - Body ground	Reclining motor position sensor ground	Always	Below 1 Ω
k3-25 (RCLR) - Body ground	B - Body ground	Fold seat switch assembly (return switch (RH)) operation signal	Return switch (RH) of fold seat switch assembly released → pushed	11 to 14 V → Below 1 V
k3-26 (RCLF) - Body ground	L - Body ground	Fold seat switch assembly (fold switch (RH)) operation signal	Fold switch (RH) of fold seat switch assembly released → pushed	11 to 14 V → Below 1 V
k3-7 (RTRN) - Body ground	B - Body ground	Fold seat switch assembly (return switch (RH)) operation signal	Return switch (RH) of No. 1 fold seat switch assembly released → pushed	11 to 14 V → Below 1 V
k3-12 (FOLD) - Body ground	L - Body ground	Fold seat switch assembly (fold switch (RH)) operation signal	Fold switch (RH) of No. 1 fold seat switch assembly released → pushed	11 to 14 V → Below 1 V
k3-17 (P) - Body ground	GR - Body ground	Driving condition signal	Any of the following conditions are met: Engine switch off Engine switch on (IG) and vehicle speed 5 km/h (3.1 mph) or more Engine switch on (IG), shift lever not in P, brake pedal not depressed and parking brake released	11 to 14 V
k3-17 (P) - Body ground	GR - Body ground	Driving condition signal	Engine switch is on (IG) and any of the following conditions are met: Vehicle speed below 5 km/h (3.1 mph) and shift lever in P Vehicle speed below 5 km/h (3.1 mph) and brake pedal depressed Vehicle speed below 5 km/h (3.1 mph) and parking brake applied	Below 1 V
k3-18 (R CL) - Body ground	P - Body ground	Rear door courtesy light switch assembly (RH) input signal	Rear door RH open → closed	Below 1 V → 11 to 14 V
k3-19 (BDCY) - Body ground	R - Body ground	Back door courtesy light switch assembly input signal	Back door open → closed	Below 1 V → 11 to 14 V

CHECK FOLD SEAT CONTROL ECU (LH SEAT)

Disconnect the m4 and m5 fold seat control ECU (LH seat) connectors.

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
m5-2 (+B) - Body ground	W - Body ground	Battery power supply	Always	11 to 14 V
m5-1 (IND1) - Body ground	B - Body ground	Battery power supply	Always	11 to 14 V
m4-1 (ECUB) - Body ground	W - Body ground	System power source	Always	11 to 14 V
m4-3 (IG) - Body ground	B - Body ground	IG switch signal	Engine switch off	Below 1 V
m4-3 (IG) - Body ground	B - Body ground	IG switch signal	Engine switch on (IG)	11 to 14 V
m5-10 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
m5-9 (GND2) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
m4-40 (IND2) - Body ground	W-B - Body ground	System ground	Always	Below 1 Ω

Reconnect the m4 and m5 fold seat control ECU (LH seat) connectors.
Measure the resistance and voltage according to the value(s) in the table below.

Using an oscilloscope, check the waveform.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
m5-4 (FLD+) - Body ground	L - Body ground	Lifter motor operation signal (Fold)	Fold switch (LH) of fold seat switch assembly or No. 1 fold seat switch assembly released → pushed (Fold operation)	Below 1 V → 11 to 14 V
m5-8 (FLD-) - Body ground	SB - Body ground	Lifter motor operation signal (Return)	Return switch (LH) of fold seat switch assembly or No. 1 fold seat switch assembly released → pushed (Return operation)	Below 1 V → 11 to 14 V
m4-11 (SV1) - m4-8 (SG1)	R - G	Lifter motor position sensor power source	Engine switch off → Engine switch on (IG)	Below 1 V → 5.5 to 10 V
m4-10 (SFLD) - m4-8 (SG1)	P - G	Lifter motor position sensor signal	Lifter motor (LH) operating (Fold/return operation)	Pulse generation (Hi: 5.5 to 10 V, Lo: Below 1 V)
m4-8(SG1) - Body ground	G - Body ground	Lifter motor position sensor ground	Always	Below 1 Ω
m5-3 (RCL+) - Body ground	L - Body ground	Reclining motor operation signal (Fold)	Fold switch (LH) of fold seat switch assembly or No. 1 fold seat switch assembly released → pushed (Fold operation)	Below 1 V → 11 to 14 V
m5-7 (RCL-) - Body ground	SB - Body ground	Reclining motor operation signal (Fold)	Return switch (LH) of fold seat switch assembly or No. 1 fold seat switch assembly released → pushed (Return operation)	Below 1 V → 11 to 14 V
m4-31 (SV2) - m4-28 (SG2)	R - B	Reclining motor position sensor power source	Engine switch off → Engine switch on (IG)	Below 1 V → 5.5 to 10 V
m4-9 (SRCL) - m4-28 (SG2)	P - B	Reclining motor position sensor signal	Reclining motor (LH) operating (Fold/return operation)	Pulse generation (Hi: 5.5 to 10 V, Lo: Below 1 V)
m4-28 (SG2) - Body ground	B - Body ground	Reclining motor position sensor ground	Always	Below 1 Ω
m4-25 (RCLR) - Body ground	B - Body ground	Fold seat switch assembly (return switch (LH)) operation signal	Return switch (LH) of fold seat switch assembly released → pushed	11 to 14 V → Below 1 V
m4-26 (RCLF) - Body ground	L - Body ground	Fold seat switch assembly (fold switch (LH)) operation signal	Fold switch (LH) of fold seat switch assembly released → pushed	11 to 14 V → Below 1 V
m4-7 (RTRN) - Body ground	B - Body ground	Fold seat switch assembly (return switch (LH)) operation signal	Return switch (LH) of No. 1 fold seat switch assembly released → pushed	11 to 14 V → Below 1 V
m4-12 (FOLD) - Body ground	L - Body ground	Fold seat switch assembly (fold switch (LH)) operation signal	Fold switch (LH) of No. 1 fold seat switch assembly released → pushed	11 to 14 V → Below 1 V
m4-17 (P) - Body ground	GR - Body ground	Driving condition signal	Any of the following conditions are met: Engine switch off Engine switch on (IG) and vehicle speed 5 km/h (3.1 mph) or more Engine switch on (IG), shift lever not in P, brake pedal not depressed and parking brake released	11 to 14 V
m4-17 (P) - Body ground	GR - Body ground	Driving condition signal	Engine switch is on (IG) and any of the following conditions are met: Vehicle speed below 5 km/h (3.1 mph) and shift lever in P Vehicle speed below 5 km/h (3.1 mph) and brake pedal depressed Vehicle speed below 5 km/h (3.1 mph) and parking brake applied	Below 1 V
m4-18 (R CL) - Body ground	P - Body ground	Rear door courtesy light switch assembly (LH) input signal	Rear door LH open → closed	Below 1 V → 11 to 14 V
m4-19 (BDCY) - Body ground	R - Body ground	Back door courtesy light switch assembly input signal	Back door open → closed	Below 1 V → 11 to 14 V

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

for LHD

for RHD

Disconnect the MB main body ECU (multiplex network body ECU) connector.

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
MB-31 (BECU) - Body ground	-	Battery power supply	Always	11 to 14 V
MB-32 (IG) - Body ground	-	IG power supply	Engine switch off	Below 1 V
MB-32 (IG) - Body ground	-	IG power supply	Engine switch on (IG)	11 to 14 V
MB-11 (GND1) - Body ground	-	Ground	Always	Below 1 Ω

Reconnect the MB main body ECU (multiplex network body ECU) connector.

Click here

Check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
J9-16 (SFTP) - Body ground	-	Driving condition signal	Any of the following conditions are met: Engine switch off Engine switch on (IG) and vehicle speed 5 km/h (3.1 mph) or more Engine switch on (IG), shift lever not in P, brake pedal not depressed and parking brake released	11 to 14 V
Engine switch is on (IG) and any of the following conditions are met: Vehicle speed below 5 km/h (3.1 mph) and shift lever in P Vehicle speed below 5 km/h (3.1 mph) and brake pedal depressed Vehicle speed below 5 km/h (3.1 mph) and parking brake applied	Below 1 V

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

J9-16 (SFTP) - Body ground

Driving condition signal

Any of the following conditions are met:

Engine switch off
Engine switch on (IG) and vehicle speed 5 km/h (3.1 mph) or more
Engine switch on (IG), shift lever not in P, brake pedal not depressed and parking brake released

11 to 14 V

Engine switch is on (IG) and any of the following conditions are met:

Vehicle speed below 5 km/h (3.1 mph) and shift lever in P
Vehicle speed below 5 km/h (3.1 mph) and brake pedal depressed
Vehicle speed below 5 km/h (3.1 mph) and parking brake applied

Below 1 V