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 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 front airbag sensor LH. Also check that the connectors that link the engine room main wire and instrument panel wire are properly connected.

   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 and front airbag sensor LH. Also disconnect the connectors that link the engine room main wire and instrument panel wire.
5. Check that the terminals of the connectors are not damaged.

   OK

   The terminals are not deformed or damaged.

NG → REPLACE WIRE HARNESS 

OK: Go to next step 

1. Connect the connectors that link the engine room main wire and instrument panel wire.
   Fig 1: Identifying Front Airbag Sensor LH Circuit (Open)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Using SST, connect terminals 30 (+SL) and 28 (-SL) of connector B.
   NOTE:

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

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A4-2 (+SL) - A4-1 (-SL)	Always	Below 1 Ω

NG → See step   7 

OK: Go to next step 

1. Disconnect SST from connector B.
   Fig 2: Identifying Front Airbag Sensor LH Circuit (Short To Ground)

   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
   A4-2 (+SL) - A4-1 (-SL)	Always	1 MΩ or higher

NG → See step   8 

OK: Go to next step 

1. Connect the cable to the negative (-) battery terminal.
   Fig 3: Identifying Front Airbag Sensor LH Circuit (Short To Ground)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the ignition switch on (IG).
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A4-2 (+SL) - Body ground	Ignition switch on (IG)	Below 1 V
   A4-1 (-SL) - Body ground	Ignition switch on (IG)	Below 1 V

NG → See step   9 

OK: Go to next step 

1. Turn the ignition switch off.
   Fig 4: Identifying Front Airbag Sensor LH Circuit (Short To Ground)

   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
   A4-2 (+SL) - Body ground	Always	1 MΩ or higher
   A4-1 (-SL) - Body ground	Always	1 MΩ or higher

NG → See step   10 

OK: Go to next step 

1. Connect the connector to the center airbag sensor assembly.
   Fig 5: Identifying Front Airbag Sensor RH

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Interchange the front airbag sensor RH with the front airbag sensor LH and connect the connectors to them.
3. Connect the cable to the negative (-) battery terminal.
4. Turn the ignition switch on (IG), 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 on (IG), and wait for at least 60 seconds.
8. Check for DTCs. Refer to DTC CHECK / CLEAR .

   Result

   Result	Proceed to
   DTCs B1603/83, B1612/83, B1613/83, B1608/84, B1617/84 and B1618/84 are not output.	A
   DTC B1608/84, B1617/84 or B1618/84 is output.	B
   DTC B1603/83, B1612/83 or B1613/83 is output.	C

   HINT: 

   Codes other than DTCs B1603/83, B1612/83, B1613/83, B1608/84, B1617/84 and B1618/84 may be output at this time, but they are not related to this check.

B → See step   13 

C → See step   12 

A → See step   11 

1. Disconnect the instrument panel wire connector from the engine room main wire.
   Fig 6: Identifying Instrument Panel Wire (Open)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT: 

   SST has already been inserted into connector B.

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   AD12-3 (+SL) - AD12-4 (-SL)	Always	Below 1 Ω

NG → REPLACE INSTRUMENT PANEL WIRE 

OK → REPLACE ENGINE ROOM MAIN WIRE 

1. Disconnect the instrument panel wire connector from the engine room main wire.
   Fig 7: Identifying Instrument Panel Wire (Short)

   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
   AD12-3 (+SL) - AD12-4 (-SL)	Always	1 MΩ or higher

NG → REPLACE INSTRUMENT PANEL WIRE 

OK → REPLACE ENGINE ROOM MAIN WIRE 

1. Turn the ignition switch off.
   Fig 8: Identifying Instrument Panel Wire (Short)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Disconnect the instrument panel wire connector from the engine room main wire.
4. Connect the cable to the negative (-) battery terminal.
5. Turn the ignition switch on (IG).
6. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   AD12-3 (+SL) - Body ground	Ignition switch on (IG)	Below 1 V
   AD12-4 (-SL) - Body ground	Ignition switch on (IG)	Below 1 V

NG → REPLACE INSTRUMENT PANEL WIRE 

OK → REPLACE ENGINE ROOM MAIN WIRE 

1. Disconnect the instrument panel wire connector from the engine room main wire.
   Fig 9: Identifying Instrument Panel Wire (Short)

   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
   AD12-3 (+SL) - Body ground	Always	1 MΩ or higher
   AD12-4 (-SL) - Body ground	Always	1 MΩ or higher

NG → REPLACE INSTRUMENT PANEL WIRE 

OK → REPLACE ENGINE ROOM MAIN WIRE