- 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 circuit for the side collision sensor LH (to determine deployment of the front seat side airbag assembly LH and curtain shield airbag assembly LH) for 2 seconds.
- Side airbag sensor LH malfunction
- Rear airbag sensor LH malfunction
- Center airbag sensor assembly malfunction
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000VJR8 |
| Model Year Start: 2016 | Model: Sienna | Prod Date Range: [12/2015 - ] |
| Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1637/82; Lost Communication with Rear Airbag Sensor LH; 2016 - 2020 MY Sienna [12/2015 - ] | ||
|
DTC |
B1637/82 |
Lost Communication with Rear Airbag Sensor LH |
DESCRIPTION
The circuit for the side collision sensor LH (to determine deployment of the front seat side airbag assembly LH and curtain shield airbag assembly LH) is composed of the center airbag sensor assembly, side airbag sensor LH and rear airbag sensor LH.
The side airbag sensor LH and rear airbag sensor LH detect impacts to the vehicle and send signals to the center airbag sensor assembly to determine if the airbag should be deployed.
DTC B1637/82 is recorded when a malfunction is detected in the circuit for the side collision sensor LH (to determine deployment of the front seat side airbag assembly LH and curtain shield airbag assembly LH).
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B1637/82 |
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 LH and rear airbag sensor LH.
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 LH and rear airbag sensor LH.
(b) Check that the connectors (on the center airbag sensor assembly side, side airbag sensor LH side and rear airbag sensor LH side) are not damaged.
OK:
The connectors are not deformed or damaged.
| NG |
|
REPLACE HARNESS AND CONNECTOR |
|
|
3. |
CHECK SIDE AIRBAG SENSOR LH |
|
(a) Interchange the side airbag sensor RH with LH 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 B1632/81 is output |
A |
|
DTC B1632/81 and B1637/82 are not output |
B |
|
DTC B1637/82 is output |
C |
Text in Illustration
|
*1 |
Side Airbag Sensor RH |
|
*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 |
|
|
|
4. |
CHECK REAR AIRBAG SENSOR LH CIRCUIT |
Text in Illustration
|
*a |
Rear view of wire harness connector (to Side Airbag Sensor LH) |
*b |
Rear view of wire harness connector (to Rear Airbag Sensor LH) |
|
*1 |
Side Airbag Sensor LH |
*2 |
Rear Airbag Sensor LH |
|
*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 |
|---|---|---|
|
K32-2 (BCL+) - Body ground |
Ignition switch ON |
Below 1 V |
|
K32-1 (BCL-) - 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 1 (BCL+) and 2 (BCL-) 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 |
|---|---|---|
|
K32-2 (BCL+) - K32-1 (BCL-) |
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 |
|---|---|---|
|
K32-2 (BCL+) - K32-1 (BCL-) |
Always |
1 MΩ or higher |
|
K32-2 (BCL+) - Body ground |
Always |
1 MΩ or higher |
|
K32-1 (BCL-) - Body ground |
Always |
1 MΩ or higher |
| NG |
|
|
|
5. |
CHECK REAR AIRBAG SENSOR LH |
(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 B1637/82 is output |
A |
|
DTC B1632/81 is output |
B |
|
DTC B1632/81 and B1637/82 are not output |
C |
Text in Illustration
|
*1 |
Rear Airbag Sensor RH |
|
*2 |
Side Airbag Sensor LH |
HINT:
DTCs other than B1632/81 and B1637/82 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 LH and RH to their original positions and connect the connectors to them.
| C |
|
| A |
|
| B |
|
|
6. |
CHECK FLOOR WIRE (REAR AIRBAG SENSOR LH - FRONT DOOR WIRE LH) |
Text in Illustration
|
*a |
Front view of wire harness connector (to Front Door Wire LH) |
*b |
Rear view of wire harness connector (to Rear Airbag Sensor LH) |
|
*1 |
Side Airbag Sensor LH |
*2 |
Rear Airbag Sensor LH |
|
*3 |
Front Door Wire LH |
*4 |
Floor Wire |
|
*5 |
Connector C |
*6 |
Connector B |
|
*7 |
Service Wire |
- |
- |
(a) Disconnect the floor wire connector from the front door wire LH.
(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 |
|---|---|---|
|
HK1-2 (BCL+) - Body ground |
Ignition switch ON |
Below 1 V |
|
HK1-4 (BCL-) - 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 (BCL-) and 4 (BCL+) 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 |
|---|---|---|
|
HK1-2 (BCL+) - HK1-4 (BCL-) |
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 |
|---|---|---|
|
HK1-2 (BCL+) - HK1-4 (BCL-) |
Always |
1 MΩ or higher |
|
HK1-2 (BCL+) - Body ground |
Always |
1 MΩ or higher |
|
HK1-4 (BCL-) - Body ground |
Always |
1 MΩ or higher |
| OK |
|
REPLACE FRONT DOOR WIRE LH |
| NG |
|
REPLACE FLOOR WIRE |
|
|