DTC B1623/81: Driver Side - Side Airbag Sensor Assembly Initialization Incomplete; DTC B1628/82: Front Passenger Side - Side Airbag Sensor Assembly Initialization Incomplete; DTC B1643/81: Driver Side Satellite Sensor Bus Initialization Incomplete; DTC B1648/82: Front Passenger Side Satellite Sensor Bus Initialization Incomplete: Procedure

1. Turn the ignition switch to ON, and wait for at least 60 seconds.
2. Turn the ignition switch to OFF.
3. Turn the ignition switch to ON, and wait for at least 60 seconds.
4. Check the past DTCs. Refer to DTC CHECK / CLEAR .
   RESULT:
   
   

   Result	Refer to
   DTC B1622 or B1627 is output	A
   DTC B1632 or B1637 is output	B
   DTC B1622, B1627, B1632 and B1637 are not output	C

A → Refer to step   19 

B → Refer to step   20 

C: Refer to next step 

1. Turn the ignition switch to OFF.
2. Turn the ignition switch to ON, and wait for at least 60 seconds.
3. Check for DTCs. Refer to DTC CHECK / CLEAR .
   RESULT:
   
   

   Result	Refer to
   DTC B1623, B1628, B1643 and B1648 are not output	A
   DTC B1623 or B1643 is output	B
   DTC B1628 or B1648 is output	C

A → Refer to step   21 

B → Refer to step   11 

C: Refer to next step 

1. Turn the ignition switch to OFF.
2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3. Check that the connectors are properly connected to the center airbag sensor and side airbag sensor RH.

   OK

   The connectors are properly connected.

NG → CONNECT CONNECTORS PROPERLY 

OK: Refer to next step 

1. Disconnect the connectors from the center airbag sensor and side airbag sensor RH.
2. 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.

NG → REPLACE FLOOR WIRE 

OK: Refer to next step 

Fig 1: Checking Floor Wire (Center Airbag Sensor - Side Airbag Sensor RH)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
2. Turn the ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Switch Condition	Specified Condition
   L19-4 (BBR+) - Body ground	Ignition switch ON	Below 1 V
   L19-3 (BBR-) - Body ground	Ignition switch ON	Below 1 V

4. Turn the ignition switch to OFF.
5. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
6. Using a service wire, connect terminals 8 (BBP+) and 11 (BBP-) of connector B.
   NOTE:

   Do not forcibly insert a service wire into the terminals of the connector when connecting the wire.

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

   Standard resistance

   Tester Connection	Condition	Specified Condition
   L19-4 (BBR+) - L19-3 (BBR-)	Always	Below 1 Ω

8. Disconnect the service wire from connector B.
9. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   L19-4 (BBR+) - L19-3 (BBR-)	Always	1 MΩ or higher
   L19-4 (BBR+) - Body ground	Always	1 MΩ or higher
   L19-3 (BBR-) - Body ground	Always	1 MΩ or higher

NG → REPLACE FLOOR WIRE 

OK: Refer to next step 

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

   OK

   The connector is properly connected.

NG → CONNECT CONNECTOR PROPERLY 

OK: Refer to next step 

1. Disconnect the connectors from the side airbag sensor RH and rear airbag sensor RH.
2. Check that the connector (on the rear airbag sensor RH side) is not damaged.

   OK

   The connector is not deformed or damaged.

NG → REPLACE FLOOR WIRE 

OK: Refer to next step 

Fig 2: Checking Floor Wire (Side Airbag Sensor RH - Rear Airbag Sensor RH)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
2. Turn the ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Switch Condition	Specified Condition
   L19-1 (BCR+) - Body ground	Ignition switch ON	Below 1 V
   L19-2 (BCR-) - Body ground	Ignition switch ON	Below 1 V

4. Turn the ignition switch to OFF.
5. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
6. Using a service wire, connect terminals 2 (BCR+) and 1 (BCR-) of connector C.
   NOTE:

   Do not forcibly insert a service wire into the terminals of the connector when connecting the wire.

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

   Standard resistance

   Tester Connection	Condition	Specified Condition
   L19-1 (BCR+) - L19-2 (BCR-)	Always	Below 1 Ω

8. Disconnect the service wire from connector C.
9. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   L19-1 (BCR+) - L19-2 (BCR-)	Always	1 MΩ or higher
   L19-1 (BCR+) - Body ground	Always	1 MΩ or higher
   L19-2 (BCR-) - Body ground	Always	1 MΩ or higher

NG → REPLACE FLOOR WIRE 

OK: Refer to next step 

Fig 3: Checking Side Airbag Sensor RH

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Interchange the side airbag sensor LH with RH and connect the connectors to them.
2. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
3. Turn the ignition switch to ON, and wait for at least 60 seconds.
4. Clear the DTCs stored in the memory. Refer to DTC CHECK / CLEAR .
5. Turn the ignition switch to OFF.
6. Turn the ignition switch to ON, and wait for at least 90 seconds.
7. Check for DTCs. Refer to DTC CHECK / CLEAR .
   RESULT
   
   

   Result	Refer to
   DTC B1623, B1628, B1643 and B1648 are not output	A
   DTC B1623 or B1643 is output	B
   DTC B1628 or B1648 is output	C

8. Turn the ignition switch to OFF.
9. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
10. Return the side airbag sensor LH and RH to their original position and connect the connectors to them.

A → Refer to step   23 

B → Refer to step   22 

C: Refer to next step 

Fig 4: Checking Rear Airbag Sensor RH

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Interchange the rear airbag sensor LH with RH and connect the connectors to them.
2. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
3. Turn the ignition switch to ON, and wait for at least 60 seconds.
4. Clear the DTCs stored in the memory. Refer to DTC CHECK / CLEAR .
5. Turn the ignition switch to OFF.
6. Turn the ignition switch to ON, and wait for at least 90 seconds.
7. Check for DTCs. Refer to DTC CHECK / CLEAR .
   RESULT
   
   

   Result	Refer to
   DTC B1623 or B1643 is output	A
   DTC B1628 or B1648 is output	B
   DTC B1623, B1628, B1643 and B1648 are not output	C

   HINT: 

   Codes other than DTC B1623, B1628, B1643 and B1648 may be output at this time, but they are not related to this check.

8. Turn the ignition switch to OFF.
9. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
10. Return the rear airbag sensor RH and LH to their original position and connect the connectors to them.

A → Refer to step   24 

B → Refer to step   25 

C → Refer to step   23 

1. Turn the ignition switch to OFF.
2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3. Check that the connectors are properly connected to the center airbag sensor and side airbag sensor LH.

   OK

   The connectors are properly connected.

NG → CONNECT CONNECTORS PROPERLY 

OK: Refer to next step 

1. Disconnect the connectors from the center airbag sensor and side airbag sensor LH.
2. Check that the connectors (on the center airbag sensor side and side airbag sensor LH side) are not damaged.

   OK

   The connectors are not deformed or damaged.

NG → REPLACE FLOOR WIRE 

OK: Refer to next step 

Fig 5: Checking Floor Wire (Center Airbag Sensor - Side Airbag Sensor LH)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
2. Turn the ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Switch Condition	Specified Condition
   L20-4 (BBL+) - Body ground	Ignition switch ON	Below 1 V
   L20-3 (BBL-) - Body ground	Ignition switch ON	Below 1 V

4. Turn the ignition switch to OFF.
5. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
6. Using a service wire, connect terminals 8 (BBD+) and 15 (BBD-) of connector B.
   NOTE:

   Do not forcibly insert a service wire into the terminals of the connector when connecting the wire.

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

   Standard resistance

   Tester Connection	Condition	Specified Condition
   L20-4 (BBL+) - L20-3 (BBL-)	Always	Below 1 Ω

8. Disconnect the service wire from connector B.
9. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   L20-4 (BBL+) - L20-3 (BBL-)	Always	1 MΩ or higher
   L20-4 (BBL+) - Body ground	Always	1 MΩ or higher
   L20-3 (BBL-) - Body ground	Always	1 MΩ or higher

NG → REPLACE FLOOR WIRE 

OK: Refer to next step 

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

   OK

   The connector is properly connected.

NG → CONNECT CONNECTORS PROPERLY 

OK: Refer to next step 

1. Disconnect the connectors from the side airbag sensor LH and rear airbag sensor LH.
2. Check that the connector (on the rear airbag sensor LH side) is not damaged.

   OK

   The connector is not deformed or damaged.

NG → REPLACE FLOOR WIRE 

OK: Refer to next step 

Fig 6: Checking Floor Wire (Side Airbag Sensor LH - Rear Airbag Sensor LH)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
2. Turn the ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Switch Condition	Specified Condition
   L20-1 (BCL+) - Body ground	Ignition switch ON	Below 1 V
   L20-2 (BCL-) - Body ground	Ignition switch ON	Below 1 V

4. Turn the ignition switch to OFF.
5. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
6. Using a service wire, connect terminals 2 (BCL+) and 1 (BCL-) of connector C.
   NOTE:

   Do not forcibly insert a service wire into the terminals of the connector when connecting the wire.

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

   Standard resistance

   Tester Connection	Condition	Specified Condition
   L20-1 (BCL+) - L20-2 (BCL-)	Always	Below 1 Ω

8. Disconnect the service wire from connector C.
9. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   L20-1 (BCL+) - L20-2 (BCL-)	Always	1 MΩ or higher
   L20-1 (BCL+) - Body ground	Always	1 MΩ or higher
   L20-2 (BCL-) - Body ground	Always	1 MΩ or higher

NG → REPLACE FLOOR WIRE 

OK: Refer to next step 

Fig 7: Checking Side Airbag Sensor LH

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Interchange the side airbag sensor RH with LH and connect the connectors to them.
2. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
3. Turn the ignition switch to ON, and wait for at least 60 seconds.
4. Clear the DTCs stored in the memory. Refer to DTC CHECK / CLEAR .
5. Turn the ignition switch to OFF.
6. Turn the ignition switch to ON, and wait for at least 90 seconds.
7. Check for DTCs. Refer to DTC CHECK / CLEAR .
   RESULT
   
   

   Result	Refer to
   DTC B1628 or B1648 is output	A
   DTC B1623, B1628, B1643 and B1648 are not output	B
   DTC B1623 or B1643 is output	C

8. Turn the ignition switch to OFF.
9. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
10. Return the side airbag sensor RH and LH to their original position and connect the connectors to them.

A → Refer to step   26 

B → Refer to step   27 

C: Refer to next step 

Fig 8: Checking Rear Airbag Sensor LH

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Interchange the rear airbag sensor RH with LH and connect the connectors to them.
2. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
3. Turn the ignition switch to ON, and wait for at least 60 seconds.
4. Clear the DTCs stored in the memory. Refer to DTC CHECK / CLEAR .
5. Turn the ignition switch to OFF.
6. Turn the ignition switch to ON, and wait for at least 90 seconds.
7. Check for DTCs. Refer to DTC CHECK / CLEAR .
   RESULT
   
   

   Result	Refer to
   DTC B1623 or B1643 is output	A
   DTC B1628 or B1648 is output	B
   DTC B1623, B1628, B1643 and B1648 are not output	C

   HINT: 

   Codes other than DTC B1623, B1628, B1643 and B1648 may be output at this time, but they are not related to this check.

8. Turn the ignition switch to OFF.
9. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
10. Return the rear airbag sensor RH and LH to their original position and connect the connectors to them.

A → Refer to step   28 

B → Refer to step   29 

C → Refer to step   23