Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VJR7
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 -           ]
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1632/81; Lost Communication with Rear Airbag Sensor RH; 2016 - 2020 MY Sienna [12/2015 -        ]

DTC

B1632/81

Lost Communication with Rear Airbag Sensor 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 B1632/81 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

B1632/81

When one of following conditions is met:

  • 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 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
  • No. 2 floor wire
  • Front door wire RH
  • Side airbag sensor RH
  • Rear airbag sensor RH
  • Center airbag sensor assembly

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

OK

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

OK

3.

CHECK SIDE AIRBAG SENSOR RH

(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 ).

(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 2016 - 2020 MY Sienna [12/2015 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: DTC CHECK / CLEAR ).

Result

Result

Proceed to

DTC B1637/82 is output

A

DTC B1632/81 and B1637/82 are not output

B

DTC B1632/81 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

REPLACE SIDE AIRBAG SENSOR RH

B

USE SIMULATION METHOD TO CHECK

C

4.

CHECK REAR AIRBAG SENSOR RH CIRCUIT

Text in Illustration

*1

Side Airbag Sensor RH

*2

Rear Airbag Sensor RH

*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 Rear Airbag Sensor RH)

(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

L50-2 (BCR+) - Body ground

Ignition switch ON

Below 1 V

L50-1 (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 1 (BCR+) and 2 (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

L50-2 (BCR+) - L50-1 (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

L50-2 (BCR+) - L50-1 (BCR-)

Always

1 MΩ or higher

L50-2 (BCR+) - Body ground

Always

1 MΩ or higher

L50-1 (BCR-) - Body ground

Always

1 MΩ or higher

NG

GO TO STEP 6

OK

5.

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 2016 - 2020 MY Sienna [12/2015 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: DTC CHECK / CLEAR ).

(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 2016 - 2020 MY Sienna [12/2015 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: DTC CHECK / CLEAR ).

Result

Result

Proceed to

DTC B1632/81 is output

A

DTC B1637/82 is output

B

DTC B1632/81 and B1637/82 are not output

C

Text in Illustration

*1

Rear Airbag Sensor LH

*2

Side Airbag Sensor RH

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

USE SIMULATION METHOD TO CHECK

A

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

B

REPLACE REAR AIRBAG SENSOR RH

6.

CHECK NO. 2 FLOOR WIRE (REAR AIRBAG SENSOR RH - FRONT DOOR WIRE RH)

Text in Illustration

*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

Front view of wire harness connector

(to Front Door Wire RH)

*b

Rear view of wire harness connector

(to Rear Airbag Sensor RH)

(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