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 B1642/81 or B1647/82 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
B1642/81	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
B1647/82	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

Dtc B1642/81 Lost Communication With Side Satellite Sensor Bus Rh. SUPPLEMENTAL RESTRAINT SYSTEMS. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

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 ().

When disconnecting the cable, some systems need to be initialized after the cable is reconnected ().

1.CHECK FOR DTC

Turn the ignition switch off.

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

Check for DTCs ().

Result
Result	Proceed to
DTC B1642 and B1647 are not output	A
DTC B1647 is output	B
DTC B1642 is output	C

HINT:

Code other than DTC B1642 and B1647 may be output at this time, but they are not related to this check.

USE SIMULATION METHOD TO CHECK ()

Go to step 12

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 and side airbag sensor RH.

OK:
The connectors are properly connected.

CONNECT CONNECTORS PROPERLY

OK

3.CHECK CONNECTORS

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

Check that the connectors (on the center airbag sensor 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 CIRCUIT

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

Dtc B1642/81 Lost Communication With Side Satellite Sensor Bus Rh. SUPPLEMENTAL RESTRAINT SYSTEMS. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Switch Condition Specified Condition
I9-4 (BBR+) - Body ground Ignition switch ON Below 1 V
I9-3 (BBR-) - 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 17 (BBR+) and 18 (BBR-) of connector B.

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
I9-4 (BBR+) - I9-3 (BBR-) Always Below 1 Ω

Disconnect the service wire from connector B.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
I9-4 (BBR+) - I9-3 (BBR-) Always 1 MΩ or higher
I9-4 (BBR+) - Body ground Always 1 MΩ or higher
I9-3 (BBR-) - Body ground Always 1 MΩ or higher

Go to step 10

OK

5.CHECK CONNECTION OF CONNECTORS

Check that the connector is properly connected to the rear airbag sensor RH.

OK:
The connector is properly connected.

CONNECT CONNECTOR PROPERLY

OK

6.CHECK CONNECTORS

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

Check that the connector (on the rear airbag sensor RH side) is not damaged.

OK:
The connector is not deformed or damaged.

REPLACE HARNESS AND CONNECTOR

OK

7.CHECK REAR AIRBAG SENSOR RH CIRCUIT

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

Dtc B1642/81 Lost Communication With Side Satellite Sensor Bus Rh. SUPPLEMENTAL RESTRAINT SYSTEMS. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

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 11

OK

8.CHECK SIDE AIRBAG SENSOR RH

Dtc B1642/81 Lost Communication With Side Satellite Sensor Bus Rh. SUPPLEMENTAL RESTRAINT SYSTEMS. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Connect the connector 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 ().

Turn the ignition switch off.

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

Check for DTCs ().

Result
Result	Proceed to
DTC B1642 and B1647 are not output	A
DTC B1647 is output	B
DTC B1642 is output	C

HINT:

Codes other than DTC B1642 and B1647 may be output at this time, but they are not related to this check.

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 LH and RH to their original positions and connect the connectors to them.

USE SIMULATION METHOD TO CHECK ()

REPLACE SIDE AIRBAG SENSOR ASSEMBLY RH ()

C

9.CHECK REAR AIRBAG SENSOR RH

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 ().

Turn the ignition switch off.

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

Check for DTCs ().

OK:
DTC B1642 is not output.

HINT:

Codes other than DTC B1642 may be output at this time, but they are not related to this check.

Turn the ignition switch off.

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

REPLACE CENTER AIRBAG SENSOR ASSEMBLY ()

REPLACE REAR AIRBAG SENSOR RH ()

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

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

Dtc B1642/81 Lost Communication With Side Satellite Sensor Bus Rh. SUPPLEMENTAL RESTRAINT SYSTEMS. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

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
IL1-4 (BBR+) - Body ground Ignition switch ON Below 1 V
IL1-3 (BBR-) - 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 17 (BBR+) and 18 (BBR-) of connector B.

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
IL1-4 (BBR+) - IL1-3 (BBR-) Always Below 1 Ω

Disconnect the service wire from connector B.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
IL1-4 (BBR+) - IL1-3 (BBR-) Always 1 MΩ or higher
IL1-4 (BBR+) - Body ground Always 1 MΩ or higher
IL1-3 (BBR-) - Body ground Always 1 MΩ or higher

REPLACE NO. 2 FLOOR WIRE

REPLACE FRONT DOOR WIRE RH

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

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

Dtc B1642/81 Lost Communication With Side Satellite Sensor Bus Rh. SUPPLEMENTAL RESTRAINT SYSTEMS. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

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

12.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 and rear airbag sensor LH.

OK:
The connectors are properly connected.

CONNECT CONNECTORS PROPERLY

OK

13.CHECK CONNECTORS

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

Check that the connectors (on the center airbag sensor side and rear airbag sensor LH side) are not damaged.

OK:
The connectors are not deformed or damaged.

REPLACE FLOOR WIRE

OK

14.CHECK FLOOR WIRE (CENTER AIRBAG SENSOR - REAR AIRBAG SENSOR LH)

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

Dtc B1642/81 Lost Communication With Side Satellite Sensor Bus Rh. SUPPLEMENTAL RESTRAINT SYSTEMS. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Switch Condition Specified Condition
K7-4 (BBL+) - Body ground Ignition switch ON Below 1 V
K7-3 (BBL-) - 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 24 (BBL+) and 23 (BBL-) of connector B.

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
K7-4 (BBL+) - K7-3 (BBL-) Always Below 1 Ω

Disconnect the service wire from connector B.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
K7-4 (BBL+) - K7-3 (BBL-) Always 1 MΩ or higher
K7-4 (BBL+) - Body ground Always 1 MΩ or higher
K7-3 (BBL-) - Body ground Always 1 MΩ or higher

REPLACE FLOOR WIRE

OK

15.CHECK CONNECTION OF CONNECTOR

Check that the connector is properly connected to the side airbag sensor LH.

OK:
The connector is properly connected.

CONNECT CONNECTORS PROPERLY

OK

16.CHECK CONNECTORS

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

Check that the connector (on the side airbag sensor LH side) is not damaged.

OK:
The connector is not deformed or damaged.

REPLACE HARNESS AND CONNECTOR

OK

17.CHECK SIDE AIRBAG SENSOR LH CIRCUIT

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

Dtc B1642/81 Lost Communication With Side Satellite Sensor Bus Rh. SUPPLEMENTAL RESTRAINT SYSTEMS. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

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+) - K7-2 (BCL-) Always 1 MΩ or higher
K7-1 (BCL+) - Body ground Always 1 MΩ or higher
K7-2 (BCL-) - Body ground Always 1 MΩ or higher

Go to step 20

OK

18.CHECK REAR AIRBAG SENSOR LH

Temporarily replace the side 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 ().

Turn the ignition switch off.

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

Check for DTCs ().

OK:
DTC B1642 or B1647 is not output.

HINT:

Codes other than DTC B1642 and B1647 may be output at this time, but they are not related to this check.

Turn the ignition switch off.

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

Go to step 19

REPLACE REAR AIRBAG SENSOR LH ()

19.CHECK SIDE 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 ().

Turn the ignition switch off.

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

Check for DTCs ().

Result
Result	Proceed to
DTC B1647 is output	A
DTC B1642 is output	B
DTC B1642 and B1647 are not output	C

HINT:

Codes other than DTC B1642 and B1647 may be output at this time, but they are not related to this check.

Turn the ignition switch off.

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

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

REPLACE CENTER AIRBAG SENSOR ASSEMBLY ()

REPLACE SIDE AIRBAG SENSOR LH ()

USE SIMULATION METHOD TO CHECK ()

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

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

Dtc B1642/81 Lost Communication With Side Satellite Sensor Bus Rh. SUPPLEMENTAL RESTRAINT SYSTEMS. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

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 (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
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+) - K7-2 (BCL-) Always 1 MΩ or higher
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

SUPPLEMENTAL RESTRAINT SYSTEMS

Land Cruiser URJ200 URJ202 GRJ200 VDJ200

AIRBAG SYSTEM

Tester Connection	Switch Condition	Specified Condition
I9-4 (BBR+) - Body ground	Ignition switch ON	Below 1 V
I9-3 (BBR-) - Body ground	Ignition switch ON	Below 1 V

Tester Connection	Condition	Specified Condition
I9-4 (BBR+) - I9-3 (BBR-)	Always	Below 1 Ω