| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000VJWC |
| Model Year Start: 2016 | Model: Sienna | Prod Date Range: [12/2015 - ] |
| Title: SEAT: REAR POWER SEAT CONTROL SYSTEM: Reclining Motor Circuit; 2016 - 2020 MY Sienna [12/2015 - ] | ||
|
Reclining Motor Circuit |
DESCRIPTION
The fold seat control ECU receives a switch operation signal from the rear power seat switch and the fold seat switch, and activates the reclining motor. At this time, the Hall IC (seatback position sensor) detects the actuation of the seatback and sends a seatback actuation signal to the fold seat control ECU. The fold seat control ECU uses signals from the Hall IC (seatback position sensor) to detect if an object is caught or if any other abnormal condition has occurred.
WIRING DIAGRAM
PROCEDURE
|
1. |
CHECK FOLD SEAT CONTROL ECU |
|
(a) Remove the fold seat control ECU with its connectors still connected (See page
|
|
![2016 - 2020 MY Sienna [12/2015 - ]; SEAT: POWER SEAT CONTROL ECU(for Rear No. 2 Seat): REMOVAL](/t3Portal/stylegraphics/info.gif)
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
LH Side
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
b2-22 (SRCL) - b2-36 (SG2) |
Motor is operating |
Pulse generation |
|
b2-25 (SV2) - b2-36 (SG2) |
Back door open |
9 to 14 V |
|
b3-2 (RCL+) - b3-6 (RCL-) |
Back door open Lock switch unlock Rear power seat switch on (Forward) |
11 to 14 V |
|
b3-6 (RCL-) - b3-2 (RCL+) |
Back door open Lock switch unlock Rear power seat switch on (Backward) |
11 to 14 V |
RH Side
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
a2-22 (SRCL) - a2-36 (SG2) |
Motor is operating |
Pulse generation |
|
a2-25 (SV2) - a2-36 (SG2) |
Back door open |
9 to 14 V |
|
a3-2 (RCL+) - a3-6 (RCL-) |
Back door open Lock switch unlock Rear power seat switch on (Forward) |
11 to 14 V |
|
a3-6 (RCL-) - a3-2 (RCL+) |
Back door open Lock switch unlock Rear power seat switch on (Backward) |
11 to 14 V |
Text in Illustration
|
*a |
Component with harness connected (Fold Seat Control ECU) |
|
*b |
LH Side |
|
*c |
RH Side |
(c) Reinstall the fold seat control ECU.
| OK |
|
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (See page
|
|
|
2. |
CHECK HARNESS AND CONNECTOR (FOLD SEAT CONTROL ECU - RECLINING MOTOR) |
(a) Disconnect the b2 and b3 or a2 and a3 fold seat control ECU connectors.
(b) Disconnect the b4 and b5 or a4 and a5 reclining motor connectors.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
LH Side
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
b2-22 (SRCL) - b4-1 (HLS) |
Always |
Below 1 Ω |
|
b2-22 (SRCL) - Body ground |
Always |
10 kΩ or higher |
|
b2-25 (SV2) - b4-3 (HLV) |
Always |
Below 1 Ω |
|
b2-25 (SV2) - Body ground |
Always |
10 kΩ or higher |
|
b2-36 (SG2) - b4-2 (HLG) |
Always |
Below 1 Ω |
|
b2-36 (SG2) - Body ground |
Always |
10 kΩ or higher |
|
b3-2 (RCL+) - b5-1 (FWD) |
Always |
Below 1 Ω |
|
b3-2 (RCL+) - Body ground |
Always |
10 kΩ or higher |
|
b3-6 (RCL-) - b5-2 (BACK) |
Always |
Below 1 Ω |
|
b3-6 (RCL-) - Body ground |
Always |
10 kΩ or higher |
RH Side
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
a2-22 (SRCL) - a4-1 (HLS) |
Always |
Below 1 Ω |
|
a2-22 (SRCL) - Body ground |
Always |
10 kΩ or higher |
|
a2-25 (SV2) - a4-3 (HLV) |
Always |
Below 1 Ω |
|
a2-25 (SV2) - Body ground |
Always |
10 kΩ or higher |
|
a2-36 (SG2) - a4-2 (HLG) |
Always |
Below 1 Ω |
|
a2-36 (SG2) - Body ground |
Always |
10 kΩ or higher |
|
a3-2 (RCL+) - a5-1 (FWD) |
Always |
Below 1 Ω |
|
a3-2 (RCL+) - Body ground |
Always |
10 kΩ or higher |
|
a3-6 (RCL-) - a5-2 (BACK) |
Always |
Below 1 Ω |
|
a3-6 (RCL-) - Body ground |
Always |
10 kΩ or higher |
(d) Reconnect the reclining motor connectors.
(e) Reconnect the fold seat control ECU connectors.
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. |
INSPECT NO. 2 SEATBACK FRAME SUB-ASSEMBLY (RECLINING MOTOR) |
|
(a) Remove the No. 2 seatback frame sub-assembly (reclining motor) (See page
|
|
(b) Check the operation of the reclining motor.
(1) Apply battery voltage to the reclining motor and check the operation of the reclining motor.
OK:
LH Side
|
Measurement Condition |
Specified Condition |
|---|---|
|
Battery positive (+) → Terminal 1 Battery negative (-) → Terminal 2 |
Forward |
|
Battery positive (+) → Terminal 2 Battery negative (-) → Terminal 1 |
Backward |
RH Side
|
Measurement Condition |
Specified Condition |
|---|---|
|
Battery positive (+) → Terminal 1 Battery negative (-) → Terminal 2 |
Forward |
|
Battery positive (+) → Terminal 2 Battery negative (-) → Terminal 1 |
Backward |
Text in Illustration
|
*a |
Component without harness connected (No. 2 Seatback Frame Sub-assembly (Reclining Motor)) |
(c) Reinstall the No. 2 seatback frame sub-assembly (reclining motor).
| OK |
|
| NG |
|
REPLACE NO. 2 SEATBACK FRAME SUB-ASSEMBLY (See page
|
|
|