SEAT: FRONT POWER SEAT CONTROL SYSTEM (for Gasoline Model with Memory): TERMINALS OF ECU; 2019 - 2022 MY Avalon [04/2018

Last Modified: 08-21-2023	6.11:8.1.0	Doc ID: RM100000001APSY
Model Year Start: 2019	Model: Avalon	Prod Date Range: [04/2018 - ]
Title: SEAT: FRONT POWER SEAT CONTROL SYSTEM (for Gasoline Model with Memory): TERMINALS OF ECU; 2019 - 2022 MY Avalon [04/2018 - ]

TERMINALS OF ECU

CHECK POSITION CONTROL ECU ASSEMBLY

(a) Disconnect the R33 and R32 position control ECU assembly connectors.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
R33-3 (B) - Body ground	W - Body ground	Battery power supply	Always	11 to 14 V
R32-1 (IG) - Body ground	LG - Body ground	Ignition power supply	Engine switch off	Below 1 V
R32-1 (IG) - Body ground	LG - Body ground	Ignition power supply	Engine switch on (IG)	11 to 14 V
R32-15 (SYSB) - Body ground	W - Body ground	System power source	Always	11 to 14 V
R33-2 (E) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
R32-27 (DBCL) - Body ground	P-W - Body ground	Driver seat belt buckle switch signal	Driver seat belt unfastened	10 kΩ or higher
R32-27 (DBCL) - Body ground	P-W - Body ground	Driver seat belt buckle switch signal	Driver seat belt fastened	Below 1 Ω

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

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
R33-1 (SLD+) - Body ground	L - Body ground	Slide motor signal (forward)	Slide switch off	Below 1 V
R33-1 (SLD+) - Body ground	L - Body ground	Slide motor signal (forward)	Slide switch on (Forward)	11 to 14 V
R33-5 (SLD-) - Body ground	GR - Body ground	Slide motor signal (rearward)	Slide switch off	Below 1 V
R33-5 (SLD-) - Body ground	GR - Body ground	Slide motor signal (rearward)	Slide switch on (Rearward)	11 to 14 V
R33-6 (LFT+) - Body ground	G - Body ground	Lifter motor signal (upward)	Lifter switch off	Below 1 V
R33-6 (LFT+) - Body ground	G - Body ground	Lifter motor signal (upward)	Lifter switch on (Upward)	11 to 14 V
R30-5 (LFT-) - Body ground	BR - Body ground	Lifter motor signal (downward)	Lifter switch off	Below 1 V
R30-5 (LFT-) - Body ground	BR - Body ground	Lifter motor signal (downward)	Lifter switch on (Downward)	11 to 14 V
R33-10 (RCL+) - Body ground	LG - Body ground	Reclining motor signal (forward)	Reclining switch off	Below 1 V
R33-10 (RCL+) - Body ground	LG - Body ground	Reclining motor signal (forward)	Reclining switch on (Forward)	11 to 14 V
R30-6 (RCL-) - Body ground	P - Body ground	Reclining motor signal (rearward)	Reclining switch off	Below 1 V
R30-6 (RCL-) - Body ground	P - Body ground	Reclining motor signal (rearward)	Reclining switch on (Rearward)	11 to 14 V
R33-7 (FRV+) - Body ground	B - Body ground	Front vertical motor signal (upward)	Front vertical switch off	Below 1 V
R33-7 (FRV+) - Body ground	B - Body ground	Front vertical motor signal (upward)	Front vertical switch on (Upward)	11 to 14 V
R30-4 (FRV-) - Body ground	R - Body ground	Front vertical motor signal (downward)	Front vertical switch off	Below 1 V
R30-4 (FRV-) - Body ground	R - Body ground	Front vertical motor signal (downward)	Front vertical switch on (Downward)	11 to 14 V
R33-9 (L+) - Body ground	Y - Body ground	Lumbar support adjuster motor signal (forward)	Lumbar support adjuster switch off	Below 1 V
R33-9 (L+) - Body ground	Y - Body ground	Lumbar support adjuster motor signal (forward)	Lumbar support adjuster switch on (Forward)	11 to 14 V
R30-3 (L-) - Body ground	V - Body ground	Lumbar support adjuster motor signal (rearward)	Lumbar support adjuster switch off	Below 1 V
R30-3 (L-) - Body ground	V - Body ground	Lumbar support adjuster motor signal (rearward)	Lumbar support adjuster switch on (Rearward)	11 to 14 V
R33-8 (LV+) - Body ground	O - Body ground	Lumbar support adjuster motor signal (upward)	Lumbar support adjuster switch off	Below 1 V
R33-8 (LV+) - Body ground	O - Body ground	Lumbar support adjuster motor signal (upward)	Lumbar support adjuster switch on (Upward)	11 to 14 V
R30-1 (LV-) - Body ground	GR-W - Body ground	Lumbar support adjuster motor signal (downward)	Lumbar support adjuster switch off	Below 1 V
R30-1 (LV-) - Body ground	GR-W - Body ground	Lumbar support adjuster motor signal (downward)	Lumbar support adjuster switch on (Downward)	11 to 14 V
R32-4 (LFLF) - Body ground	Y-B - Body ground	Front power seat switch LH (lumbar support adjuster switch (forward)) signal	Lumbar support adjuster switch off	11 to 14 V
R32-4 (LFLF) - Body ground	Y-B - Body ground		Lumbar support adjuster switch on (Forward)	Below 1 V
R32-18 (LFLR) - Body ground	V-B - Body ground	Front power seat switch LH (lumbar support adjuster switch (rearward)) signal	Lumbar support adjuster switch off	11 to 14 V
R32-18 (LFLR) - Body ground	V-B - Body ground		Lumbar support adjuster switch on (Rearward)	Below 1 Ω
R32-9 (SLDF) - Body ground	L-B - Body ground	Front power seat switch LH (slide switch (forward)) signal	Slide switch off	11 to 14 V
R32-9 (SLDF) - Body ground	L-B - Body ground	Front power seat switch LH (slide switch (forward)) signal	Slide switch on (Forward)	Below 1 V
R32-23 (SLDR) - Body ground	GR-B - Body ground	Front power seat switch LH (slide switch (rearward)) signal	Slide switch off	11 to 14 V
R32-23 (SLDR) - Body ground	GR-B - Body ground	Front power seat switch LH (slide switch (rearward)) signal	Slide switch on (Rearward)	Below 1 V
R32-8 (RCLF) - Body ground	LG-B - Body ground	Front power seat switch LH (reclining switch (forward)) signal	Reclining switch off	11 to 14 V
R32-8 (RCLF) - Body ground	LG-B - Body ground		Reclining switch on (Forward)	Below 1 V
R32-22 (RCLR) - Body ground	P-B - Body ground	Front power seat switch LH (reclining switch (rearward)) signal	Reclining switch off	11 to 14 V
R32-22 (RCLR) - Body ground	P-B - Body ground		Reclining switch on (Rearward)	Below 1 V
R32-3 (LVU) - Body ground	O-B - Body ground	Front power seat switch LH (lumbar support adjuster switch (upward)) signal	Lumbar support adjuster switch off	11 to 14 V
R32-3 (LVU) - Body ground	O-B - Body ground		Lumbar support adjuster switch on (Upward)	Below 1 V
R32-17 (LVD) - Body ground	GR-W - Body ground	Front power seat switch LH (lumbar support adjuster switch (downward)) signal	Lumbar support adjuster switch off	11 to 14 V
R32-17 (LVD) - Body ground	GR-W - Body ground		Lumbar support adjuster switch on (Downward)	Below 1 V
R32-6 (FRVU) - Body ground	B - Body ground	Front power seat switch LH (front vertical switch (upward)) signal	Front vertical switch off	11 to 14 V
R32-6 (FRVU) - Body ground	B - Body ground		Front vertical switch on (Upward)	Below 1 V
R32-20 (FRVD) - Body ground	R-B - Body ground	Front power seat switch LH (front vertical switch (downward)) signal	Front vertical switch off	11 to 14 V
R32-20 (FRVD) - Body ground	R-B - Body ground		Front vertical switch on (Downward)	Below 1 V
R32-7 (LFTU) - Body ground	G-B - Body ground	Front power seat switch LH (lifter switch (upward)) signal	Lifter switch off	11 to 14 V
R32-7 (LFTU) - Body ground	G-B - Body ground	Front power seat switch LH (lifter switch (upward)) signal	Lifter switch on (Upward)	Below 1 V
R32-21 (LFTD) - Body ground	BR-B - Body ground	Front power seat switch LH (lifter switch (downward)) signal	Lifter switch off	11 to 14 V
R32-21 (LFTD) - Body ground	BR-B - Body ground		Lifter switch on (Downward)	Below 1 V
R32-12 (SENG) - Body ground	BR - Body ground	Sensor ground	Always	Below 1 Ω

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

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
R32-10 (SSFV) - Body ground	R - Body ground	Front vertical position signal	Front vertical function operating	4.8 to 5.1 V
R32-11 (SSRR) - Body ground	O - Body ground	Reclining position signal	Reclining function operating	4.8 to 5.1 V
R32-25 (SSRL) - Body ground	P - Body ground	Lifter position signal	Lifter function operating	4.8 to 5.1 V
R32-26 (SSRS) - Body ground	G - Body ground	Slide position signal	Slide function operating	4.8 to 5.1 V

CHECK OUTER MIRROR CONTROL ECU ASSEMBLY LH

(a) Disconnect the I21 outer mirror control ECU assembly LH connector.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
I21-6 (CPUB) - I21-7 (GND)	LA-L - W-B	Battery power supply	Always	11 to 14 V
I21-14 (BDR) - I21-7 (GND)	GR - W-B	Battery power supply	Always	11 to 14 V
I21-5 (SIG) - I21-7 (GND)	LA-B - W-B	Ignition power supply	Engine switch on (IG)	11 to 14 V
I21-5 (SIG) - I21-7 (GND)	LA-B - W-B	Ignition power supply	Always	Below 1 V
I21-7 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

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

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
I21-1 (MM) - I21-7 (GND)	GR - W-B	SET switch signal for seat memory switch	SET switch on	Below 1 V
I21-1 (MM) - I21-7 (GND)	GR - W-B	SET switch signal for seat memory switch	SET switch off	11 to 14 V
I21-2 (M1) - I21-7 (GND)	BR - W-B	M1 switch signal for seat memory switch	M1 switch on	Below 1 V
I21-2 (M1) - I21-7 (GND)	BR - W-B	M1 switch signal for seat memory switch	M1 switch off	11 to 14 V
I21-3 (M2) - I21-7 (GND)	R - W-B	M2 switch signal for seat memory switch	M2 switch on	Below 1 V
I21-3 (M2) - I21-7 (GND)	R - W-B	M2 switch signal for seat memory switch	M2 switch off	11 to 14 V

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

(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Tester Connection	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	-	Ignition power supply	Engine switch on (IG)	11 to 14 V
MB-32 (IG) - Body ground	-	Ignition power supply	Engine switch off	Below 1 V
MB-30 (ACC) - Body ground	-	Ignition power supply	Engine switch on (ACC)	11 to 14 V
MB-30 (ACC) - Body ground	-	Ignition power supply	Engine switch off	Below 1 V
MB-11 (GND1) - Body ground	-	Ground	Always	Below 1 Ω
G33-1 (FLCY) - Body ground	W - Body ground	Front door courtesy light switch assembly (driver door) input	Front door LH closed (OFF) → open (ON)	10 kΩ or higher → Below 1 Ω