| Last Modified: 08-21-2023 | 6.11:8.1.0 | Doc ID: RM100000001APTA |
| Model Year Start: 2019 | Model: Avalon | Prod Date Range: [04/2018 - ] |
| Title: SEAT: FRONT POWER SEAT CONTROL SYSTEM (for Gasoline Model with Memory): One or more Power Seat Motors do not Operate; 2019 - 2022 MY Avalon [04/2018 - ] | ||
|
One or more Power Seat Motors do not Operate |
DESCRIPTION
Signals are input into the position control ECU assembly. The built-in ECU manages the signals received from the position control ECU assembly and operates each motor. If the position control ECU assembly receives 2 or more operation signals for the same motor, the motor will be stopped. Manual operation resumes when the position control ECU assembly receives only 1 signal.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
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 [04/2018 - ]; SEAT: FRONT POWER SEAT CONTROL SYSTEM (for Gasoline Model with Memory): OPERATION CHECK](/t3Portal/stylegraphics/info.gif)
|
Result |
Proceed to |
|---|---|
|
One or more power seat functions do not operate |
A |
|
All power seat functions do not operate |
B |
| B |
|
GO TO OTHER DIAGNOSIS PROCEDURE (Front Power Seat does not Operate with Front Power Seat Switch) |
|
|
2. |
READ VALUE USING TECHSTREAM (POWER SEAT SWITCH) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine 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 |
|---|---|---|---|---|
|
Reclining Rear |
Reclining switch signal (Rearward) |
ON or OFF |
ON: Reclining switch (Rearward) on OFF: Reclining switch (Rearward) off |
- |
|
Reclining Front |
Reclining switch signal (Forward) |
ON or OFF |
ON: Reclining switch (Forward) on OFF: Reclining switch (Forward) off |
- |
|
Front Vertical Down |
Front vertical switch signal (Downward) |
ON or OFF |
ON: Front vertical switch (Downward) on OFF: Front vertical switch (Downward) off |
- |
|
Front Vertical Up |
Front vertical switch signal (Upward) |
ON or OFF |
ON: Front vertical switch (Upward) on OFF: Front vertical switch (Upward) off |
- |
|
Lifter Switch Down |
Lifter switch signal (Downward) |
ON or OFF |
ON: Lifter switch (Downward) on OFF: Lifter switch (Downward) off |
- |
|
Lifter Switch Up |
Lifter switch signal (Upward) |
ON or OFF |
ON: Lifter switch (Upward) on OFF: Lifter switch (Upward) off |
- |
|
Slide Rear |
Slide switch signal (Rearward) |
ON or OFF |
ON: Slide switch (Rearward) on OFF: Slide switch (Rearward) off |
- |
|
Slide Front |
Slide switch signal (Forward) |
ON or OFF |
ON: Slide switch (Forward) on OFF: Slide switch (Forward) off |
- |
|
Lumbar Switch UP |
Lumbar support adjuster switch signal (Upward) |
ON or OFF |
ON: Lumbar support adjuster switch (Upward) on OFF: Lumbar support adjuster switch (Upward) off |
- |
|
Lumbar Switch Down |
Lumbar support adjuster switch signal (Downward) |
ON or OFF |
ON: Lumbar support adjuster switch (Downward) on OFF: Lumbar support adjuster switch (Downward) off |
- |
|
Lumbar Switch Front |
Lumbar support adjuster switch signal (Forward) |
ON or OFF |
ON: Lumbar support adjuster switch (Forward) on OFF: Lumbar support adjuster switch (Forward) off |
- |
|
Lumbar Switch Rear |
Lumbar support adjuster switch signal (Rearward) |
ON or OFF |
ON: Lumbar support adjuster switch (Rearward) on OFF: Lumbar support adjuster switch (Rearward) off |
- |
Body Electrical > Driver Seat > Data List
|
Tester Display |
|---|
|
Reclining Rear |
|
Reclining Front |
|
Front Vertical Down |
|
Front Vertical Up |
|
Lifter Switch Down |
|
Lifter Switch Up |
|
Slide Rear |
|
Slide Front |
|
Lumbar Switch UP |
|
Lumbar Switch Down |
|
Lumbar Switch Front |
|
Lumbar Switch Rear |
OK:
On the Techstream screen, ON or OFF is displayed accordingly
| NG |
|
|
|
3. |
PERFORM ACTIVE TEST USING TECHSTREAM (POWER SEAT MOTOR) |
(a) Enter the following menus: Body Electrical / Driver Seat / Active Test.
(b) Perform the Active Test according to the display on the Techstream.
Body Electrical > Driver Seat > Active Test
|
Tester Display |
Measurement Item |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
Seat Reclining |
Seat reclining operation |
OFF/Rear/Front |
- |
|
Front Vertical Operation |
Seat front vertical operation |
OFF/Down/Up |
- |
|
Lifter Operation |
Seat lifter operation |
OFF/Down/Up |
- |
|
Seat Slide Operation |
Seat slide operation |
OFF/Rear/Front |
- |
|
Lumbar Lift |
Lumbar support operation (Upward - Downward) |
OFF/Up/Down |
- |
|
Lumbar Slide |
Lumbar support operation (Forward - Rearward) |
OFF/Rear/Front |
- |
Body Electrical > Driver Seat > Active Test
|
Tester Display |
|---|
|
Seat Reclining |
Body Electrical > Driver Seat > Active Test
|
Tester Display |
|---|
|
Front Vertical Operation |
Body Electrical > Driver Seat > Active Test
|
Tester Display |
|---|
|
Lifter Operation |
Body Electrical > Driver Seat > Active Test
|
Tester Display |
|---|
|
Seat Slide Operation |
Body Electrical > Driver Seat > Active Test
|
Tester Display |
|---|
|
Lumbar Slide |
Body Electrical > Driver Seat > Active Test
|
Tester Display |
|---|
|
Lumbar Lift |
|
Result |
Proceed to |
|---|---|
|
All power seat functions operate normally |
A |
|
Slide function does not operate normally |
B |
|
Front vertical function does not operate normally |
C |
|
Lifter function does not operate normally |
D |
|
Reclining function does not operate normally |
E |
|
Lumbar support adjustment function does not operate normally |
F |
| A |
|
REPLACE POSITION CONTROL ECU ASSEMBLY
|
| C |
|
| D |
|
| E |
|
| F |
|
|
|
4. |
INSPECT SLIDE MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY LH) |
(a) Remove the slide motor (separate type front seat cushion spring assembly LH).
Click here
(b) Inspect the slide motor (separate type front seat cushion spring assembly LH).
Click here
| OK |
|
| NG |
|
REPLACE SLIDE MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY LH)
|
|
5. |
INSPECT FRONT VERTICAL MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY LH) |
(a) Remove the front vertical motor (separate type front seat cushion spring assembly LH).
Click here
(b) Inspect the front vertical motor (separate type front seat cushion spring assembly LH).
Click here
| OK |
|
| NG |
|
REPLACE FRONT VERTICAL MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY LH)
|
|
6. |
INSPECT LIFTER MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY LH) |
(a) Remove the lifter motor (separate type front seat cushion spring assembly LH).
Click here
(b) Inspect the lifter motor (separate type front seat cushion spring assembly LH).
Click here
| OK |
|
| NG |
|
REPLACE LIFTER MOTOR (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY LH)
|
|
7. |
INSPECT RECLINING MOTOR (FRONT SEATBACK FRAME SUB-ASSEMBLY LH) |
(a) Remove the reclining motor (front seatback frame sub-assembly LH).
Click here
(b) Inspect the reclining motor (front seatback frame sub-assembly LH).
Click here
| OK |
|
| NG |
|
REPLACE RECLINING MOTOR (FRONT SEATBACK FRAME SUB-ASSEMBLY LH)
|
|
8. |
INSPECT LUMBAR SUPPORT ADJUSTER ASSEMBLY LH |
(a) Remove the lumbar support adjuster assembly LH.
Click here
(b) Inspect the lumbar support adjuster assembly LH.
Click here
| NG |
|
REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY LH
|
|
|
9. |
CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - POWER SEAT MOTOR) |
(a) Disconnect the R33 and R30 position control ECU assembly connectors.
(b) Measure the resistance according to the value(s) in the table below.
HINT:
Check the wire harness and connector between the position control ECU assembly and applicable motor.
Standard Resistance:
Slide Motor
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
R33-1 (SLD+) - R23-4 (SLD+) |
Always |
Below 1 Ω |
|
R33-1 (SLD+) or R23-4 (SLD+) - Body ground |
Always |
10 kΩ or higher |
|
R33-5 (SLD-) - R23-3 (SLD-) |
Always |
Below 1 Ω |
|
R33-5 (SLD-) or R23-3 (SLD-) - Body ground |
Always |
10 kΩ or higher |
Front Vertical Motor
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
R33-7 (FRV+) - R27-3 (FRV+) |
Always |
Below 1 Ω |
|
R33-7 (FRV+) or R27-3 (FRV+) - Body ground |
Always |
10 kΩ or higher |
|
R30-4 (FRV-) - R27-1 (FRV-) |
Always |
Below 1 Ω |
|
R30-4 (FRV-) or R27-1 (FRV-) - Body ground |
Always |
10 kΩ or higher |
Lifter Motor
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
R33-6 (LFT+) - R29-3 (LFT+) |
Always |
Below 1 Ω |
|
R33-6 (LFT+) or R29-3 (LFT+) - Body ground |
Always |
10 kΩ or higher |
|
R30-5 (LFT-) - R29-1 (LFT-) |
Always |
Below 1 Ω |
|
R30-5 (LFT-) or R29-1 (LFT-) - Body ground |
Always |
10 kΩ or higher |
Reclining Motor
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
R33-10 (RCL+) - a10-3 (RCL+) |
Always |
Below 1 Ω |
|
R33-10 (RCL+) or a10-3 (RCL+) - Body ground |
Always |
10 kΩ or higher |
|
R30-6 (RCL-) - a10-1 (RCL-) |
Always |
Below 1 Ω |
|
R30-6 (RCL-) or a10-1 (RCL-) - Body ground |
Always |
10 kΩ or higher |
Front Lumbar Support Motor
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
R33-9 (L+) - a8-2 (L+) |
Always |
Below 1 Ω |
|
R33-9 (L+) or a8-2 (L+) - Body ground |
Always |
10 kΩ or higher |
|
R30-3 (L-) - a8-1 (L-) |
Always |
Below 1 Ω |
|
R30-3 (L-) or a8-1 (L-) - Body ground |
Always |
10 kΩ or higher |
|
R33-8 (LV+) - a9-2 (LV+) |
Always |
Below 1 Ω |
|
R33-8 (LV+) or a9-2 (LV+) - Body ground |
Always |
10 kΩ or higher |
|
R30-1 (LV-) - a9-1 (LV-) |
Always |
Below 1 Ω |
|
R30-1 (LV-) or a9-1 (LV-) - Body ground |
Always |
10 kΩ or higher |
| OK |
|
REPLACE POSITION CONTROL ECU ASSEMBLY
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
10. |
INSPECT FRONT POWER SEAT SWITCH LH |
(a) Remove the front power seat switch LH.
Click here
(b) Inspect the front power seat switch LH.
Click here
| NG |
|
REPLACE FRONT POWER SEAT SWITCH LH
|
|
|
11. |
CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT POWER SEAT SWITCH LH) |
(a) Disconnect the R32 position control ECU assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Ground
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
R31-20 (E) - R33-2 (E) |
Always |
Below 1 Ω |
|
R31-20 (E) or R33-2 (E) - Body ground |
Always |
Below 1 Ω |
Slide Function
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
R31-6 (SLDR) - R32-23 (SLDR) |
Always |
Below 1 Ω |
|
R31-6 (SLDR) or R32-23 (SLDR) - Body ground |
Always |
10 kΩ or higher |
|
R31-7 (SLDF) - R32-9 (SLDF) |
Always |
Below 1 Ω |
|
R31-7 (SLDF) or R32-9 (SLDF) - Body ground |
Always |
10 kΩ or higher |
Reclining Function
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
R31-1 (RCLR) - R32-22 (RCLR) |
Always |
Below 1 Ω |
|
R31-1 (RCLR) or R32-22 (RCLR) - Body ground |
Always |
10 kΩ or higher |
|
R31-2 (RCLF) - R32-8 (RCLF) |
Always |
Below 1 Ω |
|
R31-2 (RCLF) or R32-8 (RCLF) - Body ground |
Always |
10 kΩ or higher |
Front Vertical Function
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
R31-4 (FRVU) - R32-6 (FRVU) |
Always |
Below 1 Ω |
|
R31-4 (FRVU) or R32-6 (FRVU) - Body ground |
Always |
10 kΩ or higher |
|
R31-5 (FRVD) - R32-20 (FRVD) |
Always |
Below 1 Ω |
|
R31-5 (FRVD) or R32-20 (FRVD) - Body ground |
Always |
10 kΩ or higher |
Lifter Function
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
R31-3 (LFTU) - R32-7 (LFTU) |
Always |
Below 1 Ω |
|
R31-3 (LFTU) or R32-7 (LFTU) - Body ground |
Always |
10 kΩ or higher |
|
R31-8 (LFTD) - R32-21 (LFTD) |
Always |
Below 1 Ω |
|
R31-8 (LFTD) or R32-21 (LFTD) - Body ground |
Always |
10 kΩ or higher |
Lumbar Support Adjustment Function
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
R31-17 (R) - R32-18 (LFLR) |
Always |
Below 1 Ω |
|
R31-17 (R) or R32-18 (LFLR) - Body ground |
Always |
10 kΩ or higher |
|
R31-14 (H) - R32-4 (LFLF) |
Always |
Below 1 Ω |
|
R31-14 (H) or R32-4 (LFLF) - Body ground |
Always |
10 kΩ or higher |
|
R31-11 (LRU+) - R32-3 (LVU) |
Always |
Below 1 Ω |
|
R31-11 (LRU+) or R32-3 (LVU) - Body ground |
Always |
10 kΩ or higher |
|
R31-9 (LRD+) - R32-17 (LVD) |
Always |
Below 1 Ω |
|
R31-9 (LRD+) or R32-17 (LVD) - Body ground |
Always |
10 kΩ or higher |
| OK |
|
REPLACE POSITION CONTROL ECU ASSEMBLY
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|