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 passenger airbag assembly and center airbag sensor assembly. Also check that the connectors that link the instrument panel wire assembly 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.
  
  Fig 1: Identifying Connectors
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Disconnect the connectors from the front passenger airbag assembly and center airbag sensor assembly. Also disconnect the instrument panel wire from the instrument panel wire 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 assembly connector (on the front passenger airbag assembly side) is not damaged.
  OK: The lock button is not disengaged, or the claw of the lock is not deformed or damaged.
7. Check that the short springs for the instrument panel wire and instrument panel wire assembly with the activation prevention mechanism are not deformed or damaged.
  OK: The short springs are not deformed or damaged.
NG: REPLACE WIRE HARNESS

OK: Go to next step
CHECK FRONT PASSENGER AIRBAG ASSEMBLY (FRONT PASSENGER SIDE SQUIB)
1. Connect the instrument panel wire to the instrument panel wire assembly and center airbag sensor assembly
2. Connect SST (resistance 2 1 Ω) to connector E (orange connector).
  CAUTION: Never connect the tester to the front passenger airbag assembly (front passenger 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 DLC3 Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  OK: DTC B1805, B1806, B1807, B1808, or 52 is not output.
  
  HINT:
  
  Codes other than DTC B1805, B1806, B1807, B1808, and 52 may be output at this time, but they are not related to this check
NG: Go to step 3

OK: REPLACE FRONT PASSENGER AIRBAG ASSEMBLY (See REMOVAL )

CHECK FRONT PASSENGER 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 E.
Disconnect the instrument panel wire 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
a1-2 (P+) - Body ground	Engine switch on (IG)	Below 1 V
a1-1 (P-) - Body ground	Engine switch on (IG)	Below 1 V

Fig 3: Identifying Front Passenger 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
a1-2 (P+) - a1-1 (P-)	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
a1-2 (P+) - Body ground	Always	1 MΩ or higher
a1-1 (P-) - 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
a1-2 (P+) - a1-1 (P-)	Always	1 MΩ or higher

NG: Go to step 5

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 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 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 B1805, B1806, B1807, B1808, or 52 is not output.
  
  HINT
  
  Codes other than DTC B1805, B1806, B1807, B1808, and 52 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 )

CHECK INSTRUMENT PANEL WIRE

Restore the released activation prevention mechanism of connector B to the original condition.

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
Ja1-1 (P+) - Body ground	Engine switch on (IG)	Below 1 V
Ja1-2 (P-) - 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
Ja1-1 (P+) - Ja1-2 (P-)	Always	Below 1 Ω

Fig 5: Identifying Instrument Panel Wire

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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
Ja1-1 (P+) - Body ground	Always	1 MΩ or higher
Ja1-2 (P-) - 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
Ja1-1 (P+) - Ja1-2 (P-)	Always	1 MΩ or higher

NG: REPLACE INSTRUMENT PANEL WIRE

OK: Go to next step

CHECK INSTRUMENT PANEL WIRE 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
a1-2 (P+) - Body ground	Engine switch on (IG)	Below 1 V
a1-1 (P-) - 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
a1-2 (P+) - a1-1 (P-)	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
a1-2 (P+) - Body ground	Always	1 MΩ or higher
a1-1 (P-) - Body ground	Always	1 MΩ or higher

Fig 6: Identifying Instrument Panel Wire Assembly

Check for a short in the circuit

Release the activation prevention mechanism built into connector D (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
a1-2 (P+) - a1-1 (P-)	Always	1 MΩ or higher

NG: REPLACE INSTRUMENT PANEL WIRE ASSEMBLY

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