Supplemental Restraint Systems. Dtc B1632/81 Lost Communication With Rear Airbag Sensor Rh

The circuit for the side collision sensor LH or RH (to determine deployment of the front seat airbag LH or RH, rear seat side airbag LH or RH and curtain shield airbag LH or RH) is composed of the center airbag sensor, side airbag sensor LH or RH, and rear airbag sensor LH or RH.
The side airbag sensor LH or RH and rear airbag sensor LH or RH detect impacts to the vehicle and send signals to the center airbag sensor to determine if the airbag should be deployed.
DTC B1632/81 or B1697/82 is stored when a malfunction is detected in the circuit for the side collision sensor LH or RH (to determine deployment of the front seat airbag LH or RH, rear seat side airbag LH or RH and curtain shield airbag LH or RH).

DTC Code	DTC Detection Condition	Trouble Area
B1632/81	When one of the following conditions is met: 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 airbag RH and curtain shield airbag RH) for 2 seconds. A side airbag sensor RH malfunction. A rear airbag sensor RH malfunction. A center airbag sensor malfunction.	No. 2 floor wire Front door wire RH Side airbag sensor RH Rear airbag sensor RH Center airbag sensor assembly
B1633/81	When one of the following conditions is met: 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 airbag RH and curtain shield airbag RH) for 2 seconds. A side airbag sensor RH malfunction. A rear airbag sensor RH malfunction. A center airbag sensor malfunction.	No. 2 floor wire Front door wire RH Side airbag sensor RH Rear airbag sensor RH Center airbag sensor assembly
B1697/82	When one of the following conditions is met: 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 LH (to determine deployment of the front seat airbag LH and curtain shield airbag LH) for 2 seconds. A side airbag sensor LH malfunction. A rear airbag sensor LH malfunction. A center airbag sensor malfunction.	Floor wire Front door wire LH Side airbag sensor LH Rear airbag sensor LH Center airbag sensor assembly
B1698/82	When one of the following conditions is met: 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 LH (to determine deployment of the front seat airbag LH and curtain shield airbag LH) for 2 seconds. A side airbag sensor LH malfunction. A rear airbag sensor LH malfunction. A center airbag sensor malfunction.	Floor wire Front door wire LH Side airbag sensor LH Rear airbag sensor LH Center airbag sensor assembly

WIRING DIAGRAM

Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System.
Dtc
B1632/81 Lost Communication With Rear Airbag Sensor Rh

INSPECTION PROCEDURE

NOTICE:

After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work (Click here).
When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Click here).

1.CHECK FOR DTC

Turn the ignition switch to ON, and wait for at least 60 seconds.

Clear the DTCs stored in the memory (Click here).

Turn the ignition switch off.

Turn the ignition switch to ON, and wait for at least 60 seconds.

Check for DTCs (Click here).
Result
Result
Proceed to
DTC B1632, B1633, B1697 and B1698 are not output
A
DTC B1697 or B1698 is output
B
DTC B1632 or B1633 is output
C
HINT:
Codes other than DTC B1632, B1633, B1697 and B1698 may be output at this time, but they are not related to this check.

Result
Result	Proceed to
DTC B1632, B1633, B1697 and B1698 are not output	A
DTC B1697 or B1698 is output	B
DTC B1632 or B1633 is output	C

USE SIMULATION METHOD TO CHECK (Click here)

Go to step 8

C

2.CHECK CONNECTION OF CONNECTORS

Turn the ignition switch off.

Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

Check that the connectors are properly connected to the center airbag sensor, the side airbag sensor RH and rear airbag sensor RH.
OK:
The connectors are properly connected.

CONNECT CONNECTORS PROPERLY

OK

3.CHECK CONNECTORS

Disconnect the connectors from the center airbag sensor, rear airbag sensor RH and side airbag sensor RH.

Check that the connectors (on the center airbag sensor side, the rear airbag sensor RH side and side airbag sensor RH side) are not damaged.
OK:
The connectors are not deformed or damaged.

REPLACE HARNESS AND CONNECTOR

OK

4.CHECK SIDE AIRBAG SENSOR RH

Connect the connectors to the center airbag sensor.

Interchange the side airbag sensor RH with LH and connect the connectors to them.

Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

Turn the ignition switch to ON, and wait for at least 60 seconds.

Clear the DTCs stored in the memory (Click here).

Turn the ignition switch off.

Turn the ignition switch to ON, and wait for at least 60 seconds.

Check for DTCs (Click here).
Result
Result
Proceed to
DTC B1632, B1633, B1697 and B1698 are not output
A
DTC B1697 or B1698 is output
B
DTC B1632 or B1633 is output
C
HINT:
Codes other than DTC B1632, B1633, B1697 and B1698 may be output at this time, but they are not related to this check.

Result
Result	Proceed to
DTC B1632, B1633, B1697 and B1698 are not output	A
DTC B1697 or B1698 is output	B
DTC B1632 or B1633 is output	C

Turn the ignition switch off.

Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

Return the side airbag sensor RH and LH to their original positions and connect the connectors to them.

USE SIMULATION METHOD TO CHECK (Click here)

REPLACE SIDE AIRBAG SENSOR RH (Click here)

C

5.CHECK REAR AIRBAG SENSOR RH CIRCUIT

Disconnect the connectors from the side airbag sensor RH and rear airbag sensor RH.

Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
I9-1 (BCR+) - Body ground
Ignition switch ON
Below 1 V
I9-2 (BCR-) - Body ground
Ignition switch ON
Below 1 V

Turn the ignition switch off.

Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

Using a service wire, connect terminals 2 (BCR+) and 1 (BCR-) of connector E.
NOTICE:
Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
I9-1 (BCR+) - I9-2 (BCR-)
Always
Below 1 Ω

Disconnect the service wire from connector E.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
I9-1 (BCR+) - I9-2 (BCR-)
Always
1 MΩ or higher
I9-1 (BCR+) - Body ground
Always
1 MΩ or higher
I9-2 (BCR-) - Body ground
Always
1 MΩ or higher

Go to step 7

OK

6.CHECK REAR AIRBAG SENSOR RH

Connect the connectors to the center airbag sensor.

Temporarily replace the rear airbag sensor RH with a new one.

Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

Turn the ignition switch to ON, and wait for at least 60 seconds.

Clear the DTCs stored in the memory (Click here).

Turn the ignition switch off.

Turn the ignition switch to ON, and wait for at least 60 seconds.

Check for DTCs (Click here).
OK:
DTC B1632 and B1633 is not output.
HINT:
Codes other than DTC B1632 and B1633 may be output at this time, but they are not related to this check.

REPLACE CENTER AIRBAG SENSOR ASSEMBLY (Click here)

REPLACE REAR AIRBAG SENSOR RH (Click here)

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

Disconnect the front door wire RH connectors from the No. 2 floor wire.

Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
I9-1 (BCR+) - Body ground
Ignition switch ON
Below 1 V
I9-2 (BCR-) - Body ground
Ignition switch ON
Below 1 V

Turn the ignition switch off.

Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

Using a service wire, connect terminals 2 (BCR+) and 1 (BCR-) of connector C.
NOTICE:
Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
I9-1 (BCR+) - I9-2 (BCR-)
Always
Below 1 Ω

Disconnect the service wire from connector C.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
I9-1 (BCR+) - I9-2 (BCR-)
Always
1 MΩ or higher
I9-1 (BCR+) - Body ground
Always
1 MΩ or higher
I9-2 (BCR-) - Body ground
Always
1 MΩ or higher

REPLACE FRONT DOOR WIRE RH

REPLACE NO. 2 FLOOR WIRE

8.CHECK CONNECTION OF CONNECTORS

Turn the ignition switch off.

Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

Check that the connectors are properly connected to the center airbag sensor, the side airbag sensor LH and rear airbag sensor LH.
OK:
The connectors are properly connected.

CONNECT CONNECTORS PROPERLY

OK

9.CHECK CONNECTORS

Disconnect the connectors from the center airbag sensor, side airbag sensor LH and rear airbag sensor LH.

Check that the connectors (on the center airbag sensor side, the rear airbag sensor LH side and side airbag sensor LH side) are not damaged.
OK:
The connectors are not deformed or damaged.

REPLACE HARNESS AND CONNECTOR

OK

10.CHECK REAR AIRBAG SENSOR LH

Connect the connector to the center airbag sensor.

Temporarily replace the rear airbag sensor LH with a new one.

Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

Turn the ignition switch to ON, and wait for at least 60 seconds.

Clear the DTCs stored in the memory (Click here).

Turn the ignition switch off.

Turn the ignition switch to ON, and wait for at least 60 seconds.

Check for DTCs (Click here).
OK:
DTC B1697 and B1698 are not output.
HINT:
Codes other than DTC B1697 and B1698 may be output at this time, but they are not related to this check.

Go to step 11

REPLACE REAR AIRBAG SENSOR LH (Click here)

11.CHECK SIDE AIRBAG SENSOR LH CIRCUIT

Turn the ignition switch off.

Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

Disconnect the connectors from the side airbag sensor LH and rear airbag sensor LH.

Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Switch Condition
Specified condition
K7-1 (BCL+) - Body ground
Ignition switch ON
Below 1 V
K7-2 (BCL-) - Body ground
Ignition switch ON
Below 1 V

Turn the ignition switch off.

Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

Using a service wire, connect terminals 2 (BCL+) and 1 (BCL-) of connector E.
NOTICE:
Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
K7-1 (BCL+) - K7-2 (BCL-)
Always
Below 1 Ω

Disconnect the service wire from connector E.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
K7-1 (BCL+) - Body ground
Always
1 MΩ or higher
K7-2 (BCL-) - Body ground
Always
1 MΩ or higher

Go to step 13

OK

12.CHECK SIDE AIRBAG SENSOR LH

Connect the connectors to the rear airbag sensor LH.

Interchange the side airbag sensor LH with RH and connect the connectors to them.

Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

Turn the ignition switch to ON, and wait for at least 60 seconds.

Clear the DTCs stored in the memory (Click here).

Turn the ignition switch off.

Turn the ignition switch to ON, and wait for at least 60 seconds.

Check for DTCs (Click here).
Result
Result
Proceed to
DTC B1632, B1633, B1697 and B1698 are not output
A
DTC B1632 or B1633 is output
B
DTC B1697 or B1698 is output
C

Turn the ignition switch off.

Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

Return the side airbag sensor RH and LH to their original positions and connect the connectors to them.

USE SIMULATION METHOD TO CHECK (Click here)

REPLACE SIDE AIRBAG SENSOR LH (Click here)

REPLACE CENTER AIRBAG SENSOR ASSEMBLY (Click here)

13.CHECK FLOOR WIRE (SIDE AIRBAG SENSOR LH - FRONT DOOR WIRE LH)

Disconnect the floor wire connector from the front door wire LH.

Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
K7-1 (BCL+) - Body ground
Ignition switch ON
Below 1 V
K7-2 (BCL-) - Body ground
Ignition switch ON
Below 1 V

Turn the ignition switch off.

Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

Using a service wire, connect terminals 2 (BCL+) and 1 (BCL-) of connector C.
NOTICE:
Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
K7-1 (BCL+) - K7-2 (BCL-)
Always
Below 1 Ω

Disconnect the service wire from connector C.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
K7-1 (BCL+) - Body ground
Always
1 MΩ or higher
K7-2 (BCL-) - Body ground
Always
1 MΩ or higher

REPLACE FLOOR WIRE

REPLACE FRONT DOOR WIRE LH

Tester Connection	Switch Condition	Specified Condition
I9-1 (BCR+) - Body ground	Ignition switch ON	Below 1 V
I9-2 (BCR-) - Body ground	Ignition switch ON	Below 1 V

Tester Connection	Condition	Specified Condition
I9-1 (BCR+) - I9-2 (BCR-)	Always	Below 1 Ω