Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001BZC4
Model Year Start: 2019 Model: Avalon HV Prod Date Range: [04/2018 -           ]
Title: SEAT: FRONT POWER SEAT CONTROL SYSTEM (for HV Model with Memory): Power Seat Power Easy Access System Function does not Operate; 2019 - 2022 MY Avalon HV [04/2018 -        ]

Power Seat Power Easy Access System Function does not Operate

DESCRIPTION

  • Perform either of the following and check that the driver seat moves rearward:
    • With the power switch off and the shift lever in P, unfasten the driver seat seat belt.
    • With the shift lever in P and the driver seat seat belt unfastened, turn the power switch off.
  • Perform either of the following and check that the driver seat moves forward:
    • With the shift lever in P, fasten the driver seat seat belt.
    • With the shift lever in P, turn the power switch from off to on (IG).

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • The front power seat control system uses the CAN communication system. First, confirm that there is no malfunction in the CAN communication system. Refer to the How to Proceed with Troubleshooting procedure.

    Click here 2019 - 2022 MY Avalon HV [04/2018 -        ]; SEAT: FRONT POWER SEAT CONTROL SYSTEM (for HV Model with Memory): HOW TO PROCEED WITH TROUBLESHOOTING

  • Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

    Click here 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION 2021 - 2022 MY Avalon HV [08/2020 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION

HINT:

When troubleshooting a function, first make sure that the function is set to the default setting.

Click here 2019 - 2022 MY Avalon HV [04/2018 -        ]; SEAT: FRONT POWER SEAT CONTROL SYSTEM (for HV Model with Memory): CUSTOMIZE PARAMETERS

PROCEDURE

1.

CHECK FRONT POWER SEAT OPERATION

(a) Check that each function of the power seat operates normally by using the front power seat switch LH.

Click here 2019 - 2022 MY Avalon HV [04/2018 -        ]; SEAT: FRONT POWER SEAT CONTROL SYSTEM (for HV Model with Memory): OPERATION CHECK

Result

Proceed to

Power seat functions operate normally

A

All power seat functions do not operate

B

One or more power seat motors do not operate

C
B

GO TO OTHER FLOW CHART (Front Power Seat does not Operate with Front Power Seat Switch)

C

GO TO OTHER FLOW CHART (One or more Power Seat Motors do not Operate)

A

2.

READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Driver Seat / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Driver Seat > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Driver Seat Buckle SW

Driver seat belt buckle switch

ON or OFF

ON: Driver seat belt fastened

OFF: Driver seat belt unfastened

-

Body Electrical > Driver Seat > Data List

Tester Display

Driver Seat Buckle SW

OK:

On the Techstream screen, ON or OFF is displayed accordingly.

NG

GO TO STEP 5

OK

3.

REPLACE POSITION CONTROL ECU ASSEMBLY

(a) Temporarily replace the position control ECU assembly with a new or known good one.

Click here 2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; SEAT: POWER SEAT SWITCH: REMOVAL 2022 MY Avalon Avalon HV [08/2021 -        ]; SEAT: POWER SEAT SWITCH: REMOVAL

NEXT

4.

CHECK POWER SEAT POWER EASY ACCESS SYSTEM

(a) Check the power seat power easy access system.

Click here 2019 - 2022 MY Avalon HV [04/2018 -        ]; SEAT: FRONT POWER SEAT CONTROL SYSTEM (for HV Model with Memory): OPERATION CHECK

OK:

Power seat power easy access system is normal.

OK

END (POSITION CONTROL ECU ASSEMBLY WAS DEFECTIVE)
NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2022 MY Avalon Avalon HV [08/2021 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

5.

INSPECT FRONT SEAT INNER BELT ASSEMBLY LH

(a) Remove the front seat inner belt assembly LH.

Click here 2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY: REMOVAL 2022 MY Avalon Avalon HV [08/2021 -        ]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY: REMOVAL

(b) Inspect the front seat inner belt assembly LH.

Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY: INSPECTION

NG

REPLACE FRONT SEAT INNER BELT ASSEMBLY LH 2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY: REMOVAL 2022 MY Avalon Avalon HV [08/2021 -        ]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY: REMOVAL

OK

6.

CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT SEAT INNER BELT ASSEMBLY LH - BODY GROUND)

(a) Disconnect the R32 position control ECU assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

R32-27 (DBCL) - K54-5 (RDC)

Always

Below 1 Ω

R32-27 (DBCL) or K54-5 (RDC) - Body ground

Always

10 kΩ or higher

K54-6 (E) - Body ground

Always

Below 1 Ω
OK

REPLACE POSITION CONTROL ECU ASSEMBLY 2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; SEAT: POWER SEAT CONTROL ECU: REMOVAL 2022 MY Avalon Avalon HV [08/2021 -        ]; SEAT: POWER SEAT CONTROL ECU: REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR