| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000VJWE |
| Model Year Start: 2016 | Model: Sienna | Prod Date Range: [12/2015 - ] |
| Title: SEAT: REAR POWER SEAT CONTROL SYSTEM: Lock Switch Circuit; 2016 - 2020 MY Sienna [12/2015 - ] | ||
|
Lock Switch Circuit |
DESCRIPTION
Each of the left and right seats has lock switches that detect the lock condition of the seat legs to the floor when the seat is in the original or folded-down state. If any of the lock switches detect an unlock condition, the 3rd SEAT indicator on the combination meter will come on and the folding-down, return, and reclining operations will be disabled.
WIRING DIAGRAM
PROCEDURE
|
1. |
CHECK FOLD SEAT CONTROL ECU |
|
(a) Remove the fold seat control ECU with its connector still connected (See page
|
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
LH Side
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
b2-38 (LCKF) - Body ground |
All lock switches lock |
11 to 14 V |
|
Any of the lock switches unlock |
Below 1 V |
RH Side
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
a2-38 (LCKF) - Body ground |
All lock switches lock |
11 to 14 V |
|
Any of the lock switches unlock |
Below 1 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 - LOCK SWITCH) |
(a) Disconnect the b2 or a2 fold seat control ECU connector.
(b) Disconnect the b1 or a1 No. 2 seat cushion frame sub-assembly (lock switch) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
LH Side
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
b2-38 (LCKF) - b1-9 (LS+) |
Always |
Below 1 Ω |
|
b2-38 (LCKF) - Body ground |
Always |
10 kΩ or higher |
RH Side
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
a2-38 (LCKF) - a1-9 (LS+) |
Always |
Below 1 Ω |
|
a2-38 (LCKF) - Body ground |
Always |
10 kΩ or higher |
(d) Reconnect the No. 2 seat cushion frame sub-assembly (lock switch) connector.
(e) Reconnect the fold seat control ECU connector.
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. |
CHECK HARNESS AND CONNECTOR (LOCK SWITCH - BODY GROUND) |
|
(a) Disconnect the b1 or a1 No. 2 seat cushion frame sub-assembly (lock switch) connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
LH Side
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
b1-1 (E) - Body ground |
Always |
Below 1 Ω |
RH Side
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
a1-1 (E) - Body ground |
Always |
Below 1 Ω |
Text in Illustration
|
*a |
Front view of wire harness connector (to No. 2 Seat Cushion Frame Sub-assembly (Lock Switch)) |
|
*b |
LH Side |
|
*c |
RH Side |
(c) Reconnect the No. 2 seat cushion frame sub-assembly (lock switch) connector.
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
REPLACE NO. 2 SEAT CUSHION FRAME SUB-ASSEMBLY |
HINT:
Since the lock switch cannot be inspected while it is removed from the vehicle, replace the No. 2 seat cushion frame sub-assembly with a normal one and check that the condition returns to normal (See page
![2016 - 2018 MY Sienna [12/2015 - 08/2018]; SEAT: REAR NO. 2 SEAT ASSEMBLY(for Power Seat Type LH Side): DISASSEMBLY](/t3Portal/stylegraphics/info.gif)
).
OK:
Same problem does not occur.
| OK |
|
END |
| NG |
|
|
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