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 CONNECTORS
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 seat outer belt assembly LH and center airbag sensor assembly
  OK: The connectors are properly connected.
  
  HINT:
  
  If the connectors are 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 seat outer belt assembly LH 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 No. 2 floor wire connector (on the front seat outer belt assembly LH 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 No 2 floor wire with the activation prevention mechanism is not deformed or damaged
  OK: The short spring is not deformed or damaged.
NG: REPLACE NO. 2 FLOOR WIRE

OK: Go to next step
CHECK FRONT SEAT OUTER BELT ASSEMBLY LH (FRONT DRIVER SIDE PRETENSIONER 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 seat outer belt assembly LH (front driver side pretensioner squib) for measurement, as this may lead to a serious injury due to airbag deployment.
  
  Fig 2: Identifying Front Seat Outer Belt Assembly LH (Front Driver Side Pretensioner 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 DTC CHECK / CLEAR )
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 B1900, B1901, B1902, B1903, or 73 is not output.
  
  HINT.
  
  Codes other than DTC B1900, B1901, B1902, B1903, and 73 may be output at this time, but they are not related to this check
NG: Go to step 3

OK: REPLACE FRONT SEAT OUTER BELT ASSEMBLY LH (See REMOVAL )

CHECK NO. 2 FLOOR WIRE (FRONT DRIVER SIDE PRETENSIONER 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.

Fig 3: Identifying No. 2 Floor Wire (Front Driver Side Pretensioner Squib Circuit)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Switch Condition	Specified Condition
Q12-1 (L+) - Body ground	Engine switch on (IG)	Below 1 V
Q12-2 (L-) - Body ground	Engine switch on (IG)	Below 1 V

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
Q12-1 (L+) - Q12-2 (L-)	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
Q12-1 (L+) - Body ground	Always	1 MΩ or higher
Q12-2 (L-) - 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
Q12-1 (L+) - Q12-2 (L-)	Always	1 MΩ or higher

NG: REPLACE NO. 2 FLOOR 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 seat outer belt assembly LH 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 DTCs stored 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 B1900, B1901, B1902, B1903, or 73 is not output.
  
  HINT.
  
  Codes other than DTC B1900, B1901, B1902, B1903, and 73 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 )