Inspection Procedure

NOTE: After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal.

HINT:

If troubleshooting (wire harness inspection) is difficult to perform, remove the front passenger seat installation bolts to see the undersurface 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 cause a problem, such as seat rail deformation. Hold the seat only as necessary.

CHECK FOR DTC
1. Turn the engine switch on (IG).
2. Clear the DTCs stored in the occupant classification ECU (see DTC CHECK/CLEAR ).
3. Clear the DTCs stored in the center airbag sensor (see DTC CHECK / CLEAR ).
4. Turn the engine switch off.
5. Turn the engine switch on (IG).
6. Check for the DTCs (see DTC CHECK/CLEAR ).
  OK: DTC B1771 is not output.
  
  HINT:
  
  Codes other than B1771 may be output at this time, but they are not related to this check.
NG: Go to step 2

OK: USE SIMULATION METHOD TO CHECK (See DIAGNOSIS SYSTEM )
CHECK CONNECTION OF CONNECTOR
1. Turn the engine switch off.
2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3. Check that the connectors are properly connected to the occupant classification ECU and the front seat inner belt RH.
  OK: Connectors are properly connected.
NG: CONNECT CONNECTORS PROPERLY

OK: GO TO NEXT STEP
CHECK CONNECTOR
1. Disconnect the connectors from the occupant classification ECU and front seat inner belt RH.
2. Check that the connectors (on the center airbag sensor side and front seat inner belt RH side) are not damaged.
  OK: Connectors are not deformed or damaged.
  
  HINT:
  
  If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.
NG: REPLACE FRONT SEAT WIRE RH

OK: GO TO NEXT STEP

CHECK FRONT SEAT WIRE RH

Connect the negative (-) terminal cable to the battery.

Fig 1: Identifying Front Seat Wire RH

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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
e10-13 (BSW) - Body ground	Engine switch on (IG)	Below 1 V
e10-14 (BGND) -Body ground	Engine switch on (IG)	Below 1 V

Turn the engine switch off.
Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
Using a service wire, connect terminals 1 (RBE+) and 2 (RBE-) of connector C.
NOTE: Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified condition
e10-13(BSW)-e10-14 (BGND)	Always	Below 1 Ω

Disconnect the service wire 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
e10-13 (BSW)-Body ground	Always	1 MΩ or higher
e10-14 (BGND)-Body ground
e10-13(BSW)-e10-14 (BGND)

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 front seat inner belt RH.
2. Connect the negative (-) terminal cable to the battery.
3. Turn the engine switch on (IG).
4. Clear the DTCs stored in the occupant classification ECU (see DTC CHECK/CLEAR ).
5. Clear the DTCs stored in the center airbag sensor (see DTC CHECK / CLEAR )
6. Turn the engine switch off.
7. Turn the engine switch on (IG).
8. Check for the DTCs (see DTC CHECK/CLEAR ).
  OK: DTC B1771 is not output.
  
  HINT:
  
  Codes other than DTC B1771 may be output at this time, but they are not related to this check.
NG: Go to step 6

OK: USE SIMULATION METHOD TO CHECK (See DIAGNOSIS SYSTEM )
REPLACE FRONT SEAT INNER BELT ASSEMBLY RH (PASSENGER SIDE BUCKLE SWITCH)
1. Turn the engine switch off.
2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3. Replace the front seat inner belt RH (see REMOVAL ).
  HINT:
  
  Perform the inspection using parts from a normal vehicle if possible.
4. Connect the negative (-) terminal cable to the battery.
5. Turn the engine switch on (IG).
6. Clear the DTCs stored in the occupant classification ECU (see DTC CHECK/CLEAR ).
7. Clear the DTCs stored in the center airbag sensor (see CHECK MODE PROCEDURE )
8. Turn the engine switch off.
9. Turn the engine switch on (IG).
10. Check for the DTCs (see DTC CHECK/CLEAR ).
  OK: DTC B1771 is not output.
  
  HINT:
  
  Codes other than DTC B1771 may be output at this time, but they are not related to this check.
NG: Go to step 7

OK: END
REPLACE FRONT SEAT SET (OCCUPANT CLASSIFICATION ECU)
1. Connect the intelligent tester or Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Using the intelligent tester or Techstream, save the ECU data from the ECU which was installed on the vehicle (see REGISTRATION ).
4. Turn the engine switch off.
5. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
6. Replace the front seat set (occupant classification ECU) (see DISASSEMBLY ).
7. Connect the negative (-) terminal cable to the battery.
8. Turn the engine switch on (IG).
9. Using the intelligent tester or Techstream, load the previous ECU data stored in the tester into the new ECU (see REGISTRATION ).
10. Turn the engine switch off.
11. Turn the engine switch on (IG).
12. Clear the DTCs stored in the memory (see DTC CHECK/CLEAR ).
  HINT:
  
  If DTCs are not cleared at this time, past DTCs will remain.
PERFORM SENSITIVITY CHECK
1. Perform the sensitivity check (see INITIALIZATION ).
NEXT: END