Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Terminals Of Ecu

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Vehicle Interior / Seat / Front Power Seat Control System(for Gasoline Model With Memory) / Terminals Of Ecu

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

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

Driver seat belt fastened

Below 1 Ω

(c) Reconnect the R33 and R32 position control ECU assembly connectors.

(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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

(c) Reconnect the I21 outer mirror control ECU assembly LH connector.

(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

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

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

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.

Click here

(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
    System Diagram

    Wireless Transmitter Memory Function does not Operate

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