Inspection Procedure

HINT:

If troubleshooting (wire harness inspection) is difficult to perform, remove the passenger seat installation bolts to access the underside of the seat cushion.
In the above case, hold the seat so that it does not fall down. Holding the seat for a long period of time may damage the seat or deform the seat rails. Hold the seat only as necessary.

CHECK CONNECTORS
1. Turn the ignition switch off.
2. Disconnect the cable from the negative (-) battery terminal.
3. Check that the connectors are properly connected to the occupant classification ECU and the seat position airbag sensor (passenger side).
  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 occupant classification ECU and the seat position airbag sensor (passenger side).
5. Check that the terminals of the connectors are not damaged.
  OK:
  
  The terminals are not deformed or damaged .
  
  NG: REPLACE FRONT SEAT WIRE RH
  
  OK: Go to Next Step

CHECK FRONT SEAT WIRE RH (SHORT TO B+)

Connect the cable to the negative (-) battery terminal.
Turn the ignition switch to ON.
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
S2-4 (SP) - Body ground	Ignition switch ON	Below 1 V
S2-3 (GSP) - Body ground	Ignition switch ON	Below 1 V

Fig 1: Checking Front Seat Wire RH (Short To B+)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE FRONT SEAT WIRE RH

OK: Go to Next Step

CHECK FRONT SEAT WIRE RH (OPEN)

Turn the ignition switch off.

Fig 2: Checking Front Seat Wire RH (Open)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the cable from the negative (-) battery terminal.
Using SST, connect terminals 2 (SP) and 1 (GSP) of connector C.
NOTE: Do not forcibly insert SST into the terminals of the connector.

SST 09843-18040
Measure the resistance according to the value (s) in the table below.

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
S2-4 (SP) - S2-3 (GSP)	Always	Below 1 Ω

NG: REPLACE FRONT SEAT WIRE RH

OK: Go to Next Step

CHECK FRONT SEAT WIRE RH (SHORT TO GROUND)

Disconnect SST from connector C.
Measure the resistance according to the value (s) in the table below.

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
S2-4 (SP) - Body ground	Always	1 MΩ or higher
S2-3 (GSP) - Body ground	Always	1 MΩ or higher

Fig 3: Checking Front Seat Wire RH (Short To Ground)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE FRONT SEAT WIRE RH

OK: Go to Next Step

CHECK FRONT SEAT WIRE RH (SHORT)

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
S2-4 (SP) - S2-3 (GSP)	Always	1 MΩ or higher

Fig 4: Checking Front Seat Wire RH (Short)

NG: REPLACE FRONT SEAT WIRE RH

OK: Go to Next Step

CHECK FOR DTC
1. Connect the connectors to the occupant classification ECU and the seat position airbag sensor (passenger side).
2. Connect the cable to the negative (-) battery terminal.
3. Turn the ignition switch to ON.
4. Clear the DTCs stored in the occupant classification ECU (See DTC CHECK / CLEAR ).
5. Clear the DTCs stored in the center airbag sensor assembly (See DTC CHECK / CLEAR ).
6. Turn the ignition switch off.
7. Turn the ignition switch to ON.
8. Check for DTCs (See DTC CHECK / CLEAR ).
  OK:
  
  DTC B1772 is not output .
  
  HINT:
  
  DTCs other than B1772 may be output at this time, but they are not related to this check.
  
  NG: Go to Next Step
  
  OK: USE SIMULATION METHOD TO CHECK (See DIAGNOSIS SYSTEM )
INSPECT SEAT POSITION AIRBAG SENSOR (PASSENGER SIDE)
1. Turn the ignition switch off.
2. Disconnect the cable from the negative (-) battery terminal.
3. Replace the seat position airbag sensor with a known good part (passenger side) (See REMOVAL ).
  HINT:
  - Perform an inspection using known good parts from another vehicle if possible.
  - The seat position airbag sensor is installed on the driver side.
4. Connect the cable to the negative (-) battery terminal.
5. Turn the ignition switch to ON.
6. Clear the DTCs stored in the occupant classification ECU (See DTC CHECK / CLEAR ).
7. Clear the DTCs stored in the center airbag sensor assembly (See DTC CHECK / CLEAR ).
8. Turn the ignition switch off.
9. Turn the ignition switch to ON.
10. Check for DTCs (See DTC CHECK / CLEAR ).
  OK:
  
  DTC B1772 is not output .
  
  HINT:
  
  DTCs other than B1772 may be output at this time, but they are not related to this check.
  
  NG: Go to Next Step
  
  OK: END
REPLACE FRONT SEAT CUSHION ASSEMBLY
1. Turn the ignition switch off.
2. Disconnect the cable from the negative (-) battery terminal.
3. Replace the front seat cushion assembly (with occupant classification ECU and occupant classification sensor) (See REMOVAL ).
4. Connect the cable to the negative (-) battery terminal.
5. Turn the ignition switch to ON.
6. Clear the DTCs stored in the occupant classification ECU (See DTC CHECK / CLEAR ).
7. Clear the DTCs stored in the center airbag sensor assembly (See DTC CHECK / CLEAR ).
8. Turn the ignition switch off.
9. Turn the ignition switch to ON.
10. Check for DTCs (See DTC CHECK / CLEAR ).
OK:

DTC is not output .
PERFORM ZERO POINT CALIBRATION
1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Using the Techstream, perform zero point calibration (See INITIALIZATION ).
4. Turn the ignition switch off.
5. Turn the ignition switch to ON.
6. Clear the DTCs stored in the occupant classification ECU (See DTC CHECK / CLEAR ).
  HINT:
  
  If the DTCs are not cleared at this time, past DTCs will remain.
PERFORM SENSITIVITY CHECK
1. Perform the sensitivity check (See INITIALIZATION ).