Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.

HINT.

Perform the simulation method by selecting Check Mode (Signal Check) using the Techstream (See CHECK MODE PROCEDURE ).
After selecting Check Mode (Signal Check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on a city or rough road (See DIAGNOSIS SYSTEM )

CHECK CONNECTOR
1. Turn the engine 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 front passenger side knee airbag assembly and center airbag sensor assembly.
  OK: The connectors are properly connected.
  
  HINT:
  
  If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.
  
  Fig 1: Identifying Connectors
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Disconnect the connectors from the front passenger side knee airbag assembly and center airbag sensor assembly.
5. Check that the terminals of the connectors are not damaged
  OK: The terminals are not deformed or damaged.
6. Check that the instrument panel wire connector (on the front passenger side knee airbag assembly side) is not damaged
  OK: The lock button is not disengaged, and the claw of the lock is not deformed or damaged.
7. Check that the short spring for the instrument panel wire with the activation prevention mechanism are not deformed or damaged
  OK: The short spring is not deformed or damaged.
NG: REPLACE INSTRUMENT PANEL WIRE

OK: Go to next step
CHECK FRONT PASSENGER SIDE KNEE AIRBAG ASSEMBLY (FRONT PASSENGER SIDE KNEE AIRBAG SQUIB)
1. Connect the connector to the center airbag sensor assembly
2. Connect SST (resistance 2 1 Ω) to connector C
  CAUTION: Never connect the tester to the front passenger side knee airbag assembly (front passenger side knee airbag squib) for measurement, as this may lead to a serious injury due to airbag deployment.
  
  Fig 2: Identifying Front Passenger Side Knee Airbag Assembly (Front Passenger Side Knee Airbag Squib)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  NOTE:
  - Do not forcibly insert SST into the terminals of the connector when connecting.
  - Insert SST straight into the terminals of the connector.
  SST 09843-18061
3. Connect the cable to the negative (-) battery terminal
4. Turn the engine switch on (IG), and wait for at least 60 seconds
5. Clear the DTCs stored in the memory (See REMOVAL )
6. Turn the engine switch off
7. Turn the engine switch on (IG), and wait for at least 60 seconds.
8. Check for DTCs (See REMOVAL )
  OK: DTC B1865, B1866, B1867, B1868, or 65 is not output.
  
  HINT:
  
  Codes other than DTC B1865, B1866, B1867, B1868, and 65 may be output at this time, but they are not related to this check
NG: Go to step 3

OK: REPLACE FRONT PASSENGER SIDE KNEE AIRBAG ASSEMBLY (See REMOVAL )

CHECK INSTRUMENT PANEL WIRE (FRONT PASSENGER SIDE KNEE AIRBAG SQUIB CIRCUIT)

Turn the engine switch off
Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds
Disconnect SST from connector C
Disconnect the connector from the center airbag sensor assembly

Check for a short to B+ in the circuit

Connect the cable to the negative (-) battery terminal
Turn the engine switch on (IG)

Measure the voltage according to the value(s) in the table below

Standard Voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Switch Condition	Specified Condition
J79-1 (PK+) - Body ground	Engine switch on (IG)	Below 1 V
J79-2 (PK-) - Body ground	Engine switch on (IG)	Below 1 V

Fig 3: Identifying Instrument Panel Wire (Front Passenger Side Knee Airbag Squib Circuit)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check for an open in the circuit

Turn the engine switch off
Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
J79-1 (PK+) - J79-2 (PK-)	Always	Below 1 Ω

Check for a short to ground in the circuit

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
J79-1 (PK+) - Body ground	Always	1 MΩ or higher
J79-2 (PK-) - Body ground	Always	1 MΩ or higher

Check for a short in the circuit

Release the activation prevention mechanism built into connector B (See DIAGNOSIS SYSTEM ).

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
J79-1 (PK+) - J79-2 (PK-)	Always	1 MΩ or higher

NG: REPLACE INSTRUMENT PANEL WIRE

OK: Go to next step

CHECK CENTER AIRBAG SENSOR ASSEMBLY
1. Restore the released activation prevention mechanism of connector B to the original condition.
2. Connect the connectors to the front passenger side knee airbag assembly and the center airbag sensor assembly.
3. Connect the cable to the negative (-) battery terminal.
4. Turn the engine switch on (IG), and wait for at least 60 seconds
5. Clear the stored DTCs in the memory (See DTC CHECK / CLEAR ).
  
  Fig 4: Identifying DLC3 Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. Turn the engine switch off.
7. Turn the engine switch on (IG), and wait for at least 60 seconds.
8. Check for DTCs (See DTC CHECK / CLEAR )
  OK: DTC B1865, B1866, B1867, B1868, or 65 is not output.
  
  HINT.
  
  Codes other than DTC B1865, B1866, B1867, B1868, and 65 may be output at this time, but they are not related to this check.
NG: REPLACE CENTER AIRBAG SENSOR ASSEMBLY (See REMOVAL )

OK: USE SIMULATION METHOD TO CHECK (See DIAGNOSIS SYSTEM )