Supplemental Restraint Systems. Dtc B1642/81 Lost Communication With Driver Side Satellite Sensor Bus

The circuit for the side collision sensor LH or RH (to determine deployment of the front seat side airbag LH or RH and curtain shield airbag LH or RH) is composed of the center airbag sensor assembly, 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 assembly to determine if the airbag should be deployed.
DTC B1642/81 or B1647/82 is recorded when a malfunction is detected in the circuit for the side collision sensor LH or RH (to determine deployment of the front seat side airbag LH or RH and curtain shield airbag LH or RH).

DTC Code	Detection Condition	Trouble Area
B1642/81	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 LH (to determine deployment of the front seat side airbag LH and curtain shield airbag LH) for 2 seconds. Side airbag sensor LH malfunction Rear airbag sensor LH malfunction Center airbag sensor assembly malfunction	Floor wire Side airbag sensor LH Rear airbag sensor LH Center airbag sensor assembly
B1647/82	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 RH and curtain shield airbag RH) for 2 seconds. Side airbag sensor RH malfunction Rear airbag sensor RH malfunction Center airbag sensor assembly malfunction	Floor wire Side airbag sensor RH Rear airbag sensor RH Center airbag sensor assembly

WIRING DIAGRAM

Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan).
Dtc
B1642/81 Lost Communication With Driver Side Satellite Sensor Bus

INSPECTION PROCEDURE

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 (YARIS_NCP93 RM000000XFE0D2X.html).
Result:
Result
Proceed to
DTC B1642/81 and B1647/82 are not output
A
DTC B1642/81 is output
B
DTC B1647/82 is output
C

Result:
Result	Proceed to
DTC B1642/81 and B1647/82 are not output	A
DTC B1642/81 is output	B
DTC B1647/82 is output	C

USE SIMULATION METHOD TO CHECK

Go to step 10

C

2.CHECK CONNECTION OF CONNECTORS

Turn the ignition switch off.

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

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

CONNECT CONNECTORS

OK

3.CHECK CONNECTORS

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

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

REPLACE FLOOR WIRE

OK

4.CHECK FLOOR WIRE (CENTER AIRBAG SENSOR - SIDE AIRBAG SENSOR RH)

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

Turn the ignition switch to ON.

Measure the voltage according to the value(s) in the table below.
Standard voltage:
Tester Connection
Switch Condition
Specified Condition
J16-4 (BBR+) - Body ground
Ignition switch ON
Below 1 V
J16-3 (BBR-) - Body ground
Ignition switch ON
Below 1 V

Turn the ignition switch off.

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

Using a service wire, connect terminals 8 (BBP+) and 11 (BBP-) of connector B.
NOTICE:
Do not forcibly insert a service wire into the terminals of the connector when connecting the wire.

Measure the resistance according to the value(s) in the table below.
Standard resistance:
Tester Connection
Condition
Specified Condition
J16-4 (BBR+) - J16-3 (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
J16-4 (BBR+) - J16-3 (BBR-)
Always
1 MΩ or higher
J16-4 (BBR+) - Body ground
Always
1 MΩ or higher
J16-3 (BBR-) - Body ground
Always
1 MΩ or higher

REPLACE FLOOR WIRE

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

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 FLOOR WIRE

OK

7.CHECK FLOOR WIRE (SIDE AIRBAG SENSOR RH - REAR AIRBAG SENSOR RH)

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

Turn the ignition switch to ON.

Measure the voltage according to the value(s) in the table below.
Standard voltage:
Tester Connection
Switch Condition
Specified Condition
J16-1 (BCR+) - Body ground
Ignition switch ON
Below 1 V
J16-2 (BCR-) - Body ground
Ignition switch ON
Below 1 V

Turn the ignition switch off.

Disconnect the negative (-) terminal cable from the battery, 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 a service wire into the terminals of the connector when connecting the wire.

Measure the resistance according to the value(s) in the table below.
Standard resistance:
Tester Connection
Condition
Specified Condition
J16-1 (BCR+) - J16-2 (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
J16-1 (BCR+) - J16-2 (BCR-)
Always
1 MΩ or higher
J16-1 (BCR+) - Body ground
Always
1 MΩ or higher
J16-2 (BCR-) - Body ground
Always
1 MΩ or higher

REPLACE FLOOR WIRE

OK

8.CHECK SIDE AIRBAG SENSOR RH

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

Connect the negative (-) terminal cable to the battery, 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 (YARIS_NCP93 RM000000XFE0D2X.html).

Turn the ignition switch off.

Turn the ignition switch to ON, and wait for at least 90 seconds.

Check for DTCs (YARIS_NCP93 RM000000XFE0D2X.html).
Result
Result
Proceed to
DTC B1642/81 and B1647/82 are not output
A
DTC B1642/81 is output
B
DTC B1647/82 is output
C

Result
Result	Proceed to
DTC B1642/81 and B1647/82 are not output	A
DTC B1642/81 is output	B
DTC B1647/82 is output	C

Turn the ignition switch off.

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

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

USE SIMULATION METHOD TO CHECK

REPLACE SIDE AIRBAG SENSOR ASSEMBLY RH

C

9.CHECK REAR AIRBAG SENSOR RH

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

Connect the negative (-) terminal cable to the battery, 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 (YARIS_NCP93 RM000000XFE0D2X.html).

Turn the ignition switch off.

Turn the ignition switch to ON, and wait for at least 90 seconds.

Check for DTCs (YARIS_NCP93 RM000000XFE0D2X.html).
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
HINT:
Codes other than DTC B1642/82 and B1647/82 may be output at this time, but they are not related to this check.

Turn the ignition switch off.

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

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

REPLACE REAR AIRBAG SENSOR RH

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

USE SIMULATION METHOD TO CHECK

10.CHECK CONNECTION OF CONNECTORS

Turn the ignition switch off.

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

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

CONNECT CONNECTORS

OK

11.CHECK CONNECTORS

Disconnect the connectors from the center airbag sensor assembly and side airbag sensor LH.

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

REPLACE FLOOR WIRE

OK

12.CHECK FLOOR WIRE (CENTER AIRBAG SENSOR - SIDE AIRBAG SENSOR LH)

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

Turn the ignition switch to ON.

Measure the voltage according to the value(s) in the table below.
Standard voltage:
Tester Connection
Switch Condition
Specified Condition
J17-4 (BBL+) - Body ground
Ignition switch ON
Below 1 V
J17-3 (BBL-) - Body ground
Ignition switch ON
Below 1 V

Turn the ignition switch off.

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

Using a service wire, connect terminals 8 (BBD+) and 15 (BBD-) of connector B.
NOTICE:
Do not forcibly insert a service wire into the terminals of the connector when connecting the wire.

Measure the resistance according to the value(s) in the table below.
Standard resistance:
Tester Connection
Condition
Specified Condition
J17-4 (BBL+) - J17-3 (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
J17-4 (BBL+) - J17-3 (BBL-)
Always
1 MΩ or higher
J17-4 (BBL+) - Body ground
Always
1 MΩ or higher
J17-3 (BBL-) - Body ground
Always
1 MΩ or higher

REPLACE FLOOR WIRE

OK

13.CHECK CONNECTION OF CONNECTOR

Check that the connector is properly connected to the rear airbag sensor LH.
OK:
The connector is properly connected.

CONNECT CONNECTORS

OK

14.CHECK CONNECTORS

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

Check that the connector (on the rear airbag sensor LH side) is not damaged.
OK:
The connector is not deformed or damaged.

REPLACE FLOOR WIRE

OK

15.CHECK FLOOR WIRE (SIDE AIRBAG SENSOR LH - REAR AIRBAG SENSOR LH)

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

Turn the ignition switch to ON.

Measure the voltage according to the value(s) in the table below.
Standard voltage:
Tester Connection
Switch Condition
Specified Condition
J17-1 (BCL+) - Body ground
Ignition switch ON
Below 1 V
J17-2 (BCL-) - Body ground
Ignition switch ON
Below 1 V

Turn the ignition switch off.

Disconnect the negative (-) terminal cable from the battery, 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 a service wire into the terminals of the connector when connecting the wire.

Measure the resistance according to the value(s) in the table below.
Standard resistance:
Tester Connection
Condition
Specified Condition
J17-1 (BCL+) - J17-2 (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
J17-1 (BCL+) - J17-2 (BCL-)
Always
1 MΩ or higher
J17-1 (BCL+) - Body ground
Always
1 MΩ or higher
J17-2 (BCL-) - Body ground
Always
1 MΩ or higher

REPLACE FLOOR WIRE

OK

16.CHECK SIDE AIRBAG SENSOR LH

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

Connect the negative (-) terminal cable to the battery, 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 (YARIS_NCP93 RM000000XFE0D2X.html).

Turn the ignition switch off.

Turn the ignition switch to ON, and wait for at least 90 seconds.

Check for DTCs (YARIS_NCP93 RM000000XFE0D2X.html).
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

Turn the ignition switch off.

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

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

REPLACE SIDE AIRBAG SENSOR ASSEMBLY LH

USE SIMULATION METHOD TO CHECK

C

17.CHECK REAR AIRBAG SENSOR LH

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

Connect the negative (-) terminal cable to the battery, 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 (YARIS_NCP93 RM000000XFE0D2X.html).

Turn the ignition switch off.

Turn the ignition switch to ON, and wait for at least 90 seconds.

Check for DTCs (YARIS_NCP93 RM000000XFE0D2X.html).
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
HINT:
Codes other than DTC B1642/81 and B1647/82 may be output at this time, but they are not related to this check.

Turn the ignition switch off.

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

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

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

REPLACE REAR AIRBAG SENSOR LH

USE SIMULATION METHOD TO CHECK

Tester Connection	Switch Condition	Specified Condition
J16-4 (BBR+) - Body ground	Ignition switch ON	Below 1 V
J16-3 (BBR-) - Body ground	Ignition switch ON	Below 1 V

Tester Connection	Condition	Specified Condition
J16-4 (BBR+) - J16-3 (BBR-)	Always	Below 1 Ω