- The center airbag sensor assembly receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the seat position sensor circuit for 2 seconds.
- Seat position sensor malfunction
- Center airbag sensor assembly malfunction
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000VJQY |
| Model Year Start: 2016 | Model: Sienna | Prod Date Range: [12/2015 - ] |
| Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1653/35; Seat Position Airbag Sensor Circuit Malfunction; 2016 - 2020 MY Sienna [12/2015 - ] | ||
|
DTC |
B1653/35 |
Seat Position Airbag Sensor Circuit Malfunction |
DESCRIPTION
The seat position sensor circuit consists of the center airbag sensor assembly and the seat position sensor.
DTC B1653/35 is stored when a malfunction is detected in the seat position sensor circuit.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B1653/35 |
When one of following conditions is met: |
|
WIRING DIAGRAM
PROCEDURE
|
1. |
CHECK CONNECTION OF CONNECTORS |
(a) Turn the ignition switch off.
(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(c) Check that the connectors are properly connected to the center airbag sensor assembly and the seat position sensor.
OK:
The connectors are properly connected.
| NG |
|
CONNECT CONNECTORS PROPERLY |
|
|
2. |
CHECK CONNECTORS |
(a) Disconnect the connectors from the center airbag sensor assembly and the seat position sensor.
(b) Check that the connectors (on the center airbag sensor assembly side and seat position sensor side) are not damaged.
OK:
The connectors are not deformed or damaged.
| NG |
|
REPLACE HARNESS AND CONNECTOR |
|
|
3. |
CHECK SEAT POSITION SENSOR CIRCUIT (CENTER AIRBAG SENSOR ASSEMBLY - SEAT POSITION SENSOR) |
Text in Illustration
|
*1 |
Seat Position Sensor |
*2 |
Center Airbag Sensor Assembly |
|
*3 |
Connector E |
*4 |
Connector B |
|
*5 |
Service Wire |
- |
- |
|
*a |
Front view of wire harness connector (to Seat Position Sensor) |
*b |
Rear view of wire harness connector (to Center Airbag Sensor Assembly) |
(a) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
1 - Body ground |
Ignition switch ON |
Below 1 V |
|
2 - Body ground |
Ignition switch ON |
Below 1 V |
(d) Turn the ignition switch off.
(e) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(f) Using a service wire, connect terminals 17 (LSP-) and 9 (LSP+) of connector B.
NOTICE:
Do not forcibly insert a service wire into the terminals of the connector when connecting the wire.
(g) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
1 - 2 |
Always |
Below 1 Ω |
(h) Disconnect the service wire from connector B.
(i) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
1 - 2 |
Always |
1 MΩ or higher |
|
1 - Body ground |
Always |
1 MΩ or higher |
|
2 - Body ground |
Always |
1 MΩ or higher |
| NG |
|
|
|
4. |
CHECK SEAT POSITION SENSOR |
|
(a) Connect the connectors to the center airbag sensor assembly and the seat position sensor. |
|
(b) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(c) Turn the ignition switch to ON, and wait for at least 60 seconds.
(d) Clear the DTCs stored (See page
![2016 - 2020 MY Sienna [12/2015 - ]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: DTC CHECK / CLEAR](/t3Portal/stylegraphics/info.gif)
).
(e) Turn the ignition switch off.
(f) Turn the ignition switch to ON, and wait for at least 60 seconds.
(g) Check for DTCs (See page
).
OK:
DTC B1653/35 is not output.
Text in Illustration
|
*1 |
Seat Position Sensor |
|
*2 |
Center Airbag Sensor Assembly |
HINT:
Codes other than DTC B1653/35 may be output at this time, but they are not related to this check.
| OK |
|
|
|
5. |
REPLACE SEAT POSITION SENSOR |
(a) Turn the ignition switch off.
(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(c) Replace the seat position sensor (See page
).
HINT:
Perform inspection using parts from a normal vehicle if possible.
|
|
6. |
CHECK CENTER AIRBAG SENSOR ASSEMBLY |
|
(a) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds. |
|
(b) Turn the ignition switch to ON, and wait for at least 60 seconds.
(c) Clear the DTCs (See page
).
(d) Turn the ignition switch off.
(e) Turn the ignition switch to ON, and wait for at least 60 seconds.
(f) Check for DTCs (See page
).
OK:
DTC B1653/35 is not output.
Text in Illustration
|
*1 |
Seat Position Sensor |
|
*2 |
Center Airbag Sensor Assembly |
HINT:
Codes other than DTC B1653/35 may be output at this time, but they are not related to this check.
| OK |
|
END |
| NG |
|
|
7. |
CHECK FLOOR WIRE (CENTER AIRBAG SENSOR ASSEMBLY - FRONT SEAT INNER BELT ASSEMBLY LH) |
Text in Illustration
|
*1 |
Seat Position Sensor |
*2 |
Center Airbag Sensor Assembly |
|
*3 |
Front Seat Inner Belt Assembly LH |
*4 |
Floor Wire |
|
*5 |
Connector C |
*6 |
Connector B |
|
*7 |
Service Wire |
- |
- |
|
*a |
Front view of wire harness connector (to Front Seat Inner Belt Assembly LH) |
*b |
Rear view of wire harness connector (to Center Airbag Sensor Assembly) |
(a) Disconnect the floor wire connector from the front seat inner belt assembly LH.
(b) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(c) Turn the ignition switch to ON.
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
K24-4 (LSP+) - Body ground |
Ignition switch ON |
Below 1 V |
|
K24-3 (LSP-) - Body ground |
Ignition switch ON |
Below 1 V |
(e) Turn the ignition switch off.
(f) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(g) Using a service wire, connect terminals 17 (LSP-) and 9 (LSP+) of connector B.
NOTICE:
Do not forcibly insert a service wire into the terminals of the connector when connecting the wire.
(h) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K24-4 (LSP+) - K24-3 (LSP-) |
Always |
Below 1 Ω |
(i) Disconnect the service wire from connector B.
(j) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K24-4 (LSP+) - K24-3 (LSP-) |
Always |
1 MΩ or higher |
|
K24-4 (LSP+) - Body ground |
Always |
1 MΩ or higher |
|
K24-3 (LSP-) - Body ground |
Always |
1 MΩ or higher |
| OK |
|
| NG |
|
REPLACE FLOOR WIRE |
|
|