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 rear 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 rear 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 rear 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 REAR SEAT OUTER BELT ASSEMBLY LH (REAR 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 rear seat outer belt assembly LH (rear driver side pretensioner 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 )
  OK: DTC B1920, B1921, B1922, B1923, or 77 is not output.
  
  HINT:
  
  Codes other than DTC B1920, B1921, B1922, B1923, and 77 may be output at this time, but they are not related to this check.
  
  Fig 2: Identifying Rear Seat Outer Belt Assembly LH (Rear Driver Side Pretensioner Squib)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: Go to step 3

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

CHECK NO. 2 FLOOR WIRE (REAR 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 (Rear Driver Side Pretensioner Squib Circuit)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Switch Condition	Specified Condition
Q20-1 (RL+) - Body ground	Engine switch on (IG)	Below 1 V
Q20-2 (RL-) - 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
Q20-1 (RL+) - Q20-2 (RL-)	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
Q20-1 (RL+) - Body ground	Always	1 MΩ or higher
Q20-2 (RL-) - 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
Q20-1 (RL+) - Q20-2 (RL-)	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 rear 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 B1920, B1921, B1922, B1923, or 77 is not output.
  
  HINT
  
  Codes other than DTC B1920, B1921, B1922, B1923, and 77 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 )