DTC B1608/84: Front Satellite Sensor Bus LH Initialization Incomplete; DTC B1617/84: Lost Communication with Front Airbag Sensor LH; DTC B1618/84: Front Airbag Sensor LH Initialization Incomplete: Procedure

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 instrument panel wire connector from the center airbag sensor assembly.
4. Check the instrument panel wire connector and terminals (on the center airbag sensor assembly side) and check that the connector is properly connected to the center airbag sensor assembly.

   Result

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

B → REPLACE INSTRUMENT PANEL WIRE 

C → CONNECT CONNECTOR PROPERLY 

A: Go to next step 

1. Disconnect the engine room main wire connector from the front airbag sensor LH.
2. Check the engine room main wire connector and terminals (on the front airbag sensor LH side) and check that the connector is properly connected to the front airbag sensor LH.

   Result

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

B → REPLACE ENGINE ROOM MAIN WIRE 

C → CONNECT CONNECTOR PROPERLY 

A: Go to next step 

Fig 1: Checking Front Airbag Sensor LH Circuit

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
      E29-30 (+SL) - Body ground	Ignition switch ON	Below 1 V
      E29-28 (-SL) - 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 A33-1 and A33-2 of connector E.
      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
      E29-30 (+SL) - E29-28 (-SL)	Always	Below 1 Ω

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

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      E29-30 (+SL) - E29-28 (-SL)	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
      E29-30 (+SL) - Body ground	Always	1 MΩ or higher
      E29-28 (-SL) - Body ground	Always	1 MΩ or higher

NG → See step   5 

OK: Go to next step 

Fig 2: Checking Front Airbag Sensor LH

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Connect the connectors to the center airbag sensor assembly.
2. Interchange the front airbag sensor LH with the front airbag sensor RH and connect the connectors to them.
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 B1608/84, B1617/84 or B1618/84 is output.	A
   DTC B1603/83, B1612/83 or B1613/83 is output.	B

B → See step   7 

A → See step   8 

1. Disconnect the engine room main wire connector from the instrument panel wire.
2. Check the engine room main wire connector and terminals (on the instrument panel wire side) and check that the connector is properly connected to the instrument panel wire.

   Result

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

B → REPLACE ENGINE ROOM MAIN WIRE 

C → CONNECT CONNECTOR PROPERLY 

A: Go to next step 

Fig 3: Checking Engine Room Main Wire

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
      EA3-1 - Body ground	Ignition switch ON	Below 1 V
      EA3-2 - 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 A33-1 and A33-2 of connector E.
      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
      EA3-1 - EA3-2	Always	Below 1 Ω

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

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      EA3-1 - EA3-2	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
      EA3-1 - Body ground	Always	1 MΩ or higher
      EA3-2 - Body ground	Always	1 MΩ or higher

NG → REPLACE ENGINE ROOM MAIN WIRE 

OK → REPLACE INSTRUMENT PANEL WIRE