DTC B1643/81: Driver Side Satellite Sensor Bus Initialization Incomplete: Procedure

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

   Result

   Result	Proceed to
   DTC B1622/81 and B1632/81 are not output.	A
   DTC B1622/81 is output.	B
   DTC B1632/81 is output.	C

B → See step   8 

C → See step   13 

A: Go to next step 

1. Turn the ignition switch off.
2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3. Disconnect the No. 2 floor wire connectors from the center airbag sensor assembly and the side airbag sensor LH.
4. Check the No. 2 floor wire connectors and terminals (on the center airbag sensor assembly and the side airbag sensor LH sides) and check that the connectors are properly connected.

   Result

   Result	Proceed to
   No problem.	A
   Connectors or terminals incorrect.	B
   Connector connected improperly.	C

B → REPLACE NO. 2 FLOOR WIRE 

C → CONNECT CONNECTORS PROPERLY 

A: Go to next step 

Fig 1: Checking No. 2 Floor Wire (Center Airbag Sensor Assembly - Side Airbag Sensor LH)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Check for short to B+ in the circuit.
   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
      L1-24 (BBD+) - Body ground	Ignition switch ON	Below 1 V
      L1-23 (BBD-) - Body ground	Ignition switch ON	Below 1 V

   4. Turn the ignition switch off.
   5. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
2. Check for open in the circuit.
   1. Using a service wire, connect L4-4 (BBL+) and L4-3 (BBL-) of connector C.
      NOTE:

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

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

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      L1-24 (BBD+) - L1-23 (BBD-)	Always	Below 1 Ω

3. Check for short in the circuit.
   1. Disconnect the service wire from connector C.
   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      L1-24 (BBD+) - L1-23 (BBD-)	Always	1 MΩ or higher

4. Check for short to ground in the circuit.
   1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      L1-24 (BBD+) - Body ground	Always	1 MΩ or higher
      L1-23 (BBD-) - Body ground	Always	1 MΩ or higher

NG → REPLACE NO. 2 FLOOR WIRE 

OK: Go to next step 

1. Turn the ignition switch off.
2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3. Disconnect the No. 2 floor wire connectors from the side airbag sensor LH and the rear airbag sensor LH.
4. Check the No. 2 floor wire connectors and terminals (on the side airbag sensor LH and the rear airbag sensor LH sides) and check that the connectors are properly connected.

   Result

   Result	Proceed to
   No problem.	A
   Connectors or terminals incorrect.	B
   Connector connected improperly.	C

B → REPLACE NO. 2 FLOOR WIRE 

C → CONNECT CONNECTORS PROPERLY 

A: Go to next step 

Fig 2: Checking No. 2 Floor Wire (Side Airbag Sensor LH - Rear Airbag Sensor LH)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Check for short to B+ in the circuit.
   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
      L4-1 (BCL+) - Body ground	Ignition switch ON	Below 1 V
      L4-2 (BCL-) - Body ground	Ignition switch ON	Below 1 V

   4. Turn the ignition switch off.
   5. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
2. Check for open in the circuit.
   1. Using a service wire, connect L6-1 (BCL-) and L6-2 (BCL+) of connector C.
      NOTE:

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

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

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      L4-1 (BCL+) - L4-2 (BCL-)	Always	Below 1 Ω

3. Check for short in the circuit.
   1. Disconnect the service wire from connector C.
   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      L4-1 (BCL+) - L4-2 (BCL-)	Always	1 MΩ or higher

4. Check for short to ground in the circuit.
   1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      L4-1 (BCL+) - Body ground	Always	1 MΩ or higher
      L4-2 (BCL-) - Body ground	Always	1 MΩ or higher

NG → REPLACE NO. 2 FLOOR WIRE 

OK: Go to next step 

1. Connect the connector to the center airbag sensor assembly.
2. Interchange the side airbag sensor LH with the side airbag sensor RH and connect the connectors to them.
   Fig 3: Checking Side Airbag Sensor LH

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
4. Turn the ignition switch to ON, and wait for at least 60 seconds.
5. Clear the DTCs stored in the memory. Refer to DTC CHECK / CLEAR .
6. Turn the ignition switch off.
7. Turn the ignition switch to ON, and wait for at least 60 seconds.
8. Check for DTCs. Refer to DTC CHECK / CLEAR .

   Result

   Result	Proceed to
   DTC B1643/81 is output.	A
   DTC B1648/82 is output.	B
   DTC B1643/81 or B1648/82 is not output.	C

   HINT: 

   DTCs other than DTC B1643/81 and B1648/82 may be output at this time, but they are not related to this check.

B → See step   9 

C → See step   12 

A: Go to next step 

1. Connect the connector to the side airbag sensor LH.
2. Interchange the rear airbag sensor LH with the rear airbag sensor RH and connect the connectors to them.
   Fig 4: Checking Rear Airbag Sensor LH

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
4. Turn the ignition switch to ON, and wait for at least 60 seconds.
5. Clear the DTCs stored in the memory. Refer to DTC CHECK / CLEAR .
6. Turn the ignition switch off.
7. Turn the ignition switch to ON, and wait for at least 60 seconds.
8. Check for DTCs. Refer to DTC CHECK / CLEAR .

   Result

   Result	Proceed to
   DTC B1643/81 or B1648/82 is not output.	A
   DTC B1643/81 is output.	B
   DTC B1648/82 is output.	C

   HINT: 

   DTCs other than DTC B1643/81 and B1648/82 may be output at this time, but they are not related to this check.

B → See step   10 

C → See step   11 

A → See step   12