DTC B1620/21: Side Airbag Sensor RH Circuit Malfunction: Procedure

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

   OK

   The connectors are properly connected.

   HINT: 

   If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.

4. Disconnect the connectors from the center airbag sensor assembly, side airbag sensor RH and rear airbag sensor RH.
5. Check that the terminals of the connectors are not damaged.

   OK

   The terminals are not deformed or damaged.

NG → REPLACE NO. 2 FLOOR WIRE 

OK: Go to next step 

1. Using SST, connect terminals 8 (BBR+) and 11 (BBR-) of connector B.
   Fig 1: Checking No. 2 Floor Wire Using SST (Open)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   NOTE:

   Do not forcibly insert SST into the terminals of the connector.

   • SST: 09843-18040 
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   M7-4 (BBR+) - M7-3 (BBR-)	Always	Below 1 Ω

NG → REPLACE NO. 2 FLOOR WIRE 

OK: Go to next step 

1. Disconnect SST from connector B.
   Fig 2: Checking No. 2 Floor Wire And M7 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   M7-4 (BBR+) - M7-3 (BBR-)	Always	1 MΩ or higher

NG → REPLACE NO. 2 FLOOR WIRE 

OK: Go to next step 

1. Connect the cable to the negative (-) battery terminal.
   Fig 3: Checking No. 2 Floor Wire And M7 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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
   M7-4 (BBR+) - Body ground	Ignition switch ON	Below 1 V
   M7-3 (BBR-) - Body ground	Ignition switch ON	Below 1 V

NG → REPLACE NO. 2 FLOOR WIRE 

OK: Go to next step 

1. Turn the ignition switch off.
   Fig 4: Checking No. 2 Floor Wire And M7 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   M7-4 (BBR+) - Body ground	Always	1 MΩ or higher
   M7-3 (BBR-) - Body ground	Always	1 MΩ or higher

NG → REPLACE NO. 2 FLOOR WIRE 

OK: Go to next step 

1. Using SST, connect terminals 2 (BCR+) and 1 (BCR-) of connector C.
   Fig 5: Checking No. 2 Floor Wire Using SST (Open)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   NOTE:

   Do not forcibly insert SST into the terminals of the connector.

   • SST: 09843-18040 
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   M7-1 (BCR+) - M7-2 (BCR-)	Always	Below 1 Ω

NG → REPLACE NO. 2 FLOOR WIRE 

OK: Go to next step 

1. Disconnect SST from connector C.
   Fig 6: Checking No. 2 Floor Wire And M7 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   M7-1 (BCR+) - M7-2 (BCR-)	Always	1 MΩ or higher

NG → REPLACE NO. 2 FLOOR WIRE 

OK: Go to next step 

1. Connect the cable to the negative (-) battery terminal.
   Fig 7: Checking No. 2 Floor Wire And M7 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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
   M7-1 (BCR+) - Body ground	Ignition switch ON	Below 1 V
   M7-2 (BCR-) - Body ground	Ignition switch ON	Below 1 V

NG → REPLACE NO. 2 FLOOR WIRE 

OK: Go to next step 

1. Turn the ignition switch off.
   Fig 8: Checking No. 2 Floor Wire And M7 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   M7-1 (BCR+) - Body ground	Always	1 MΩ or higher
   M7-2 (BCR-) - Body ground	Always	1 MΩ or higher

NG → REPLACE NO. 2 FLOOR WIRE 

OK: Go to next step 

1. Connect the connectors to the center airbag sensor assembly and rear airbag sensor RH.
   Fig 9: Checking Side Airbag Sensor

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Interchange the side airbag sensor LH with RH and connect the connectors.
3. Connect the cable to the negative (-) battery terminal.
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 B1620/21 is output.	A
   DTC B1625/22 is output.	B
   DTC B1620/21 and B1625/22 are not output.	C

   HINT: 

   Codes other than DTC B1620/21 and B1625/22 may be output at this time, but they are not related to this check.

B → See step   13 

C → See step   12 

A: Go to next step 

1. Turn the ignition switch off.
   Fig 10: Checking Rear Airbag Sensor

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Return the side airbag sensors LH and RH to their original positions and connect the connectors.
4. Disconnect the connector from the rear airbag sensor RH.
5. Connect the cable to the negative (-) battery terminal.
6. Turn the ignition switch to ON, and wait for at least 60 seconds.
7. Clear the DTCs stored in the memory. Refer to DTC CHECK / CLEAR .
8. Turn the ignition switch off.
9. Turn the ignition switch to ON, and wait for at least 60 seconds.
10. Check for DTCs. Refer to DTC CHECK / CLEAR .

    OK

    DTC B1620/21 is not output.

    HINT: 

    Codes other than DTC B1620/21 may be output at this time, but they are not related to this check.

NG → See step   14 

OK → See step   15