- The center airbag sensor 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 circuit for the side collision sensor RH (to determine deployment of the front seat side airbag assembly RH and curtain shield airbag assembly RH) for 2 seconds.
- Side airbag sensor RH malfunction
- Rear airbag sensor RH malfunction
- Center airbag sensor assembly malfunction
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000VJRD |
| Model Year Start: 2016 | Model: Sienna | Prod Date Range: [12/2015 - ] |
| Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1642/81; Lost Communication with Side Satellite Sensor Bus RH; 2016 - 2020 MY Sienna [12/2015 - ] | ||
|
DTC |
B1642/81 |
Lost Communication with Side Satellite Sensor Bus RH |
DESCRIPTION
The circuit for the side collision sensor RH (to determine deployment of the front seat side airbag assembly RH and curtain shield airbag assembly RH) is composed of the center airbag sensor assembly, side airbag sensor RH and rear airbag sensor RH.
The side airbag sensor RH and rear airbag sensor RH detect impacts to the vehicle and send signals to the center airbag sensor assembly to determine if the airbag should be deployed.
DTC B1642/81 is recorded when a malfunction is detected in the circuit for the side collision sensor RH (to determine deployment of the front seat side airbag assembly RH and curtain shield airbag assembly RH).
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B1642/81 |
When one of following conditions is met: |
|
WIRING DIAGRAM
PROCEDURE
|
1. |
CHECK CONNECTION OF CONNECTORS |
(a) Turn the ignition switch off.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Check that the connectors are properly connected to the center airbag sensor assembly, side airbag sensor RH and rear airbag sensor RH.
OK:
The connectors are properly connected.
| NG |
|
CONNECT CONNECTORS PROPERLY |
|
|
2. |
CHECK CONNECTORS |
(a) Disconnect the connectors from the center airbag sensor assembly, side airbag sensor RH and rear airbag sensor RH.
(b) Check that the connectors (on the center airbag sensor assembly side, side airbag sensor RH side and rear airbag sensor RH side) are not damaged.
OK:
The connectors are not deformed or damaged.
| NG |
|
REPLACE HARNESS AND CONNECTOR |
|
|
3. |
CHECK SIDE AIRBAG SENSOR RH CIRCUIT (CENTER AIRBAG SENSOR - SIDE AIRBAG SENSOR RH) |
Text in Illustration
|
*1 |
Side Airbag Sensor RH |
*2 |
Center Airbag Sensor Assembly |
|
*3 |
Connector E |
*4 |
Connector B |
|
*5 |
Service Wire |
- |
- |
|
*a |
Rear view of wire harness connector (to Side Airbag Sensor RH) |
*b |
Rear view of wire harness connector (to Center Airbag Sensor Assembly) |
(a) Connect the negative (-) terminal cable to the battery, 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 |
|---|---|---|
|
G12-4 (BBR+) - Body ground |
Ignition switch ON |
Below 1 V |
|
G12-3 (BBR-) - Body ground |
Ignition switch ON |
Below 1 V |
(d) Turn the ignition switch off.
(e) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(f) Using a service wire, connect terminals 18 (BBR+) and 17 (BBR-) 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 |
|---|---|---|
|
G12-4 (BBR+) - G12-3 (BBR-) |
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 |
|---|---|---|
|
G12-4 (BBR+) - G12-3 (BBR-) |
Always |
1 MΩ or higher |
|
G12-4 (BBR+) - Body ground |
Always |
1 MΩ or higher |
|
G12-3 (BBR-) - Body ground |
Always |
1 MΩ or higher |
| NG |
|
|
|
4. |
CHECK REAR AIRBAG SENSOR RH CIRCUIT (SIDE AIRBAG SENSOR RH - REAR AIRBAG SENSOR RH) |
Text in Illustration
|
*a |
Rear view of wire harness connector (to Rear Airbag Sensor RH) |
*b |
Rear view of wire harness connector (to Side Airbag Sensor RH) |
|
*1 |
Rear Airbag Sensor RH |
*2 |
Side Airbag Sensor RH |
|
*3 |
Connector E |
*4 |
Connector B |
|
*5 |
Service Wire |
- |
- |
(a) Connect the negative (-) terminal cable to the battery, 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 |
|---|---|---|
|
G12-1 (BCR+) - Body ground |
Ignition switch ON |
Below 1 V |
|
G12-2 (BCR-) - Body ground |
Ignition switch ON |
Below 1 V |
(d) Turn the ignition switch off.
(e) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(f) Using a service wire, connect terminals 4 (BCR+) and 3 (BCR-) of connector E.
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 |
|---|---|---|
|
G12-1 (BCR+) - G12-2 (BCR-) |
Always |
Below 1 Ω |
(h) Disconnect the service wire from connector E.
(i) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
G12-1 (BCR+) - G12-2 (BCR-) |
Always |
1 MΩ or higher |
|
G12-1 (BCR+) - Body ground |
Always |
1 MΩ or higher |
|
G12-2 (BCR-) - Body ground |
Always |
1 MΩ or higher |
| NG |
|
|
|
5. |
CHECK SIDE AIRBAG SENSOR RH |
(a) Interchange the side airbag sensor LH with RH and connect the connectors to them.
(b) Connect the negative (-) terminal cable to the battery, 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 in the memory (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 90 seconds.
(g) Check for DTCs (See page
).
Result
|
Result |
Proceed to |
|---|---|
|
DTC B1647/82 is output |
A |
|
DTC B1642/81 and B1647/82 are not output |
B |
|
DTC B1642/81 is output |
C |
Text in Illustration
|
*1 |
Side Airbag Sensor LH |
|
*2 |
Center Airbag Sensor Assembly |
(h) Turn the ignition switch off.
(i) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(j) Return the side airbag sensor RH and LH to their original positions and connect the connectors to them.
| A |
|
| B |
|
|
|
6. |
CHECK REAR AIRBAG SENSOR RH |
(a) Interchange the rear airbag sensor LH with RH and connect the connectors to them.
(b) Connect the negative (-) terminal cable to the battery, 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 in the memory (See page
).
(e) Turn the ignition switch off.
(f) Turn the ignition switch to ON, and wait for at least 90 seconds.
(g) Check for DTCs (See page
).
Result
|
Result |
Proceed to |
|---|---|
|
DTC B1642/81 is output |
A |
|
DTC B1647/82 is output |
B |
|
DTC B1642/81 and B1647/82 are not output |
C |
Text in Illustration
|
*1 |
Rear Airbag Sensor LH |
|
*2 |
Side Airbag Sensor RH |
HINT:
DTCs other than B1642/81 and B1647/82 may be output at this time, but they are not related to this check.
(h) Turn the ignition switch off.
(i) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(j) Return the rear airbag sensor RH and LH to their original positions and connect the connectors to them.
| C |
|
| A |
|
| B |
|
|
7. |
CHECK NO. 2 FLOOR WIRE (CENTER AIRBAG SENSOR ASSEMBLY - FRONT DOOR WIRE RH) |
Text in Illustration
|
*1 |
Side Airbag Sensor RH |
*2 |
Center Airbag Sensor Assembly |
|
*3 |
Front Door Wire RH |
*4 |
No. 2 Floor Wire |
|
*5 |
Connector C |
*6 |
Connector B |
|
*7 |
Service Wire |
- |
- |
|
*a |
Front view of wire harness connector (to Front Door Wire RH) |
*b |
Rear view of wire harness connector (to Center Airbag Sensor Assembly) |
(a) Disconnect the No. 2 floor wire connector from the front door wire RH.
(b) Connect the negative (-) terminal cable to the battery, 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 |
|---|---|---|
|
GL1-1 (BBR-) - Body ground |
Ignition switch ON |
Below 1 V |
|
GL1-3 (BBR+) - Body ground |
Ignition switch ON |
Below 1 V |
(e) Turn the ignition switch off.
(f) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(g) Using a service wire, connect terminals 18 (BBR+) and 17 (BBR-) 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 |
|---|---|---|
|
GL1-1 (BBR-) - GL1-3 (BBR+) |
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 |
|---|---|---|
|
GL1-1 (BBR-) - GL1-3 (BBR+) |
Always |
1 MΩ or higher |
|
GL1-1 (BBR-) - Body ground |
Always |
1 MΩ or higher |
|
GL1-3 (BBR+) - Body ground |
Always |
1 MΩ or higher |
| OK |
|
REPLACE FRONT DOOR WIRE RH |
| NG |
|
REPLACE NO. 2 FLOOR WIRE |
|
8. |
CHECK NO. 2 FLOOR WIRE (REAR AIRBAG SENSOR RH - FRONT DOOR WIRE RH) |
Text in Illustration
|
*a |
Front view of wire harness connector (to Front Door Wire RH) |
*b |
Rear view of wire harness connector (to Rear Airbag Sensor RH) |
|
*1 |
Side Airbag Sensor RH |
*2 |
Rear Airbag Sensor RH |
|
*3 |
Front Door Wire RH |
*4 |
No. 2 Floor Wire |
|
*5 |
Connector C |
*6 |
Connector B |
|
*7 |
Service Wire |
- |
- |
(a) Disconnect the No. 2 floor wire connector from the front door wire RH.
(b) Connect the negative (-) terminal cable to the battery, 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 |
|---|---|---|
|
GL1-2 (BCR+) - Body ground |
Ignition switch ON |
Below 1 V |
|
GL1-4 (BCR-) - Body ground |
Ignition switch ON |
Below 1 V |
(e) Turn the ignition switch off.
(f) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(g) Using a service wire, connect terminals 3 (BCR-) and 4 (BCR+) 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 |
|---|---|---|
|
GL1-2 (BCR+) - GL1-4 (BCR-) |
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 |
|---|---|---|
|
GL1-2 (BCR+) - GL1-4 (BCR-) |
Always |
1 MΩ or higher |
|
GL1-2 (BCR+) - Body ground |
Always |
1 MΩ or higher |
|
GL1-4 (BCR-) - Body ground |
Always |
1 MΩ or higher |
| OK |
|
REPLACE FRONT DOOR WIRE RH |
| NG |
|
REPLACE NO. 2 FLOOR WIRE |
|
|