DTC B1612/83: Lost Communication with Front Airbag Sensor RH; DTC B1613/83: Front Airbag Sensor RH 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 for DTCs. Refer to DTC CHECK / CLEAR .

   OK

   DTC B161A/8A is not output.

NG → See step   10 

OK: Go to next step 

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 and the front airbag sensor RH.

   OK

   The connectors are properly connected.

NG → CONNECT CONNECTORS PROPERLY 

OK: Go to next step 

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

   OK

   The connectors are not deformed or damaged.

NG → REPLACE HARNESS AND CONNECTOR 

OK: Go to next step 

Fig 1: Checking Front Airbag Sensor RH - Center Airbag Sensor Assembly Circuit

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Connect the cable to the negative battery terminal, 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
   A12-2 (+SR) - Body ground	Ignition switch ON	Below 1 V
   A12-1 (-SR) - Body ground	Ignition switch ON	Below 1 V

4. Turn the ignition switch off.
5. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
6. Using a service wire, connect terminals 29 and 27 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
   A12-2 (+SR) - A12-1 (-SR)	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
   A12-2 (+SR) - A12-1 (-SR)	Always	1 MΩ or higher
   A12-2 (+SR) - Body ground	Always	1 MΩ or higher
   A12-1 (-SR) - Body ground	Always	1 MΩ or higher

NG → See step   6 

OK: Go to next step 

Fig 2: Checking Front Airbag Sensor LH - Center Airbag Sensor Assembly Circuit

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Connect the connectors to the center airbag sensor assembly.
2. Interchange the front airbag sensor RH with LH and connect the connectors to them.
3. Connect the cable to the negative (-) battery terminal, 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 B1612/83, B1613/83, B1617/84 and B1618/84 are not output	A
   DTC B1617/84 or B1618/84 is output	B
   DTC B1612/83 or B1613/83 is output	C

   TEXT IN ILLUSTRATION
   
   

   *1	Front Airbag Sensor LH
   *2	Center Airbag Sensor Assembly

   HINT: 

   DTCs other than B1612, B1613, B1617, B1618, 83 and 84 may be output at this time, but they are not related to this check.

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

A → See step   9 

B → See step   8 

C → See step   7 

Fig 3: Checking Instrument Panel Wire (Center Airbag Sensor Assembly - Engine Room Main Wire) Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the instrument panel wire connector from the engine room main wire.
2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
3. Turn the ignition switch to ON.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   AD1-1 (+SR) - Body ground	Ignition switch ON	Below 1 V
   AD1-2 (-SR) - Body ground	Ignition switch ON	Below 1 V

5. Turn the ignition switch off.
6. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
7. Using a service wire, connect terminal -SR and +SR of connector B.
   NOTE:

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

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   AD1-1 (+SR) - AD1-2 (-SR)	Always	Below 1 Ω

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

    Standard Resistance

    Tester Connection	Condition	Specified Condition
    AD1-1 (+SR) - AD1-2 (-SR)	Always	1 MΩ or higher
    AD1-1 (+SR) - Body ground	Always	1 MΩ or higher
    AD1-2 (-SR) - Body ground	Always	1 MΩ or higher

NG → REPLACE INSTRUMENT PANEL WIRE 

OK → REPLACE ENGINE ROOM MAIN WIRE