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 the Check Mode (Signal Check) using the Techstream (See CHECK MODE PROCEDURE )
After selecting the 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 side airbag assembly LH 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
4. Disconnect the connectors from the front seat side airbag 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.
  
  Fig 1: Identifying Connectors
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. 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 SIDE AIRBAG ASSEMBLY LH (FRONT DRIVER SIDE - SIDE 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 side airbag assembly LH (front driver side - side squib) for measurement, as this may lead to a serious injury due to airbag deployment.
  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 )
  
  Fig 2: Identifying Front Seat Side Airbag Assembly LH (Front Driver Side - Side Squib)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  OK: DTC B1820, B1821, B1822, B1823, or 55 is not output.
  
  HINT.
  
  Codes other than DTC B1820, B1821, B1822, B1823, and 55 may be output at this time, but they are not related to this check
NG: Go to step 3

OK: REPLACE FRONT SEAT ASSEMBLY LH (See REMOVAL )

CHECK NO. 2 FLOOR WIRE (FRONT DRIVER SIDE - SIDE 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
Qd1-1 (SFL+) - Body ground	Engine switch on (IG)	Below 1 V
Qd1-2 (SFL-) - Body ground	Engine switch on (IG)	Below 1 V

Fig 3: Identifying No. 2 Floor Wire (Front Driver Side - Side 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
Qd1-1 (SFL+) - Qd1-2 (SFL-)	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
Qd1-1 (SFL+) - Body ground	Always	1 MΩ or higher
Qd1-2 (SFL-) - Body ground	Always	1 MΩ or higher

Check for a short in the circuit.

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

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
Qd1-1 (SFL+) - Qd1-2 (SFL-)	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 side airbag 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 )
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 )
  
  Fig 4: Identifying DLC3 Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  OK: DTC B1820, B1821, B1822, B1823, or 55 is not output.
  
  HINT.
  
  Codes other than DTC B1820, B1821, B1822, B1823, and 55 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 )