Inspection Procedure

WARNING: This page is about a different variant/trim than selected.

HINT:

If troubleshooting (wire harness inspection) is difficult to perform, remove the front passenger seat installation bolts to see the under surface of 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 DTC
1. Turn the power 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 assembly (See DTC CHECK/CLEAR (2006/03-2006/10) ).
4. Turn the power switch off.
5. Turn the power switch on (IG).
6. Check the DTCs (See DTC CHECK/CLEAR ).
  OK: DTC B1793 is not output.
  
  HINT:
  
  Codes other than DTC B1793 may be output at this time, but they are not related to this check.
OK: USE SIMULATION METHOD TO CHECK (See DIAGNOSIS SYSTEM )

NG: Go To Next Step
CHECK CONNECTION OF CONNECTORS
1. Turn the power 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 occupant classification sensors.
  OK: The connectors are properly connected.
NG: CONNECT CONNECTORS PROPERLY, THEN GO TO STEP 1

OK: Go To Next Step

CHECK FRONT SEAT WIRE RH (SHORT TO B+)

Disconnect the connectors from the occupant classification ECU and the 4 occupant classification sensors.
Connect the negative (-) terminal cable to the battery.
Turn the power switch on (IG).

Measure the voltage according to the value(s) in TESTER CONNECTION SPECIFIED CONDITION TABLE .

Standard voltage: for Power seat

TESTER CONNECTION SPECIFIED CONDITION TABLE

Tester connection	Condition	Specified condition
T11-5 (SVC3) - Body ground	Power switch on (IG)	Below 1 V
T11-6 (SVC4) - Body ground	Power switch on (IG)	Below 1 V
T11-11 (SVC1) - Body ground	Power switch on (IG)	Below 1V
T11-12 (SVC2) - Body ground	Power switch on (IG)	Below 1 V

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

for Manual seat

TESTER CONNECTION SPECIFIED CONDITION

Tester connection	Condition	Specified condition
d1-5 (SVC3) - Body ground	Power switch on (IG)	Below 1 V
d1-6 (SVC4) - Body ground	Power switch on (IG)	Below 1 V
d1-11 (SVC1) - Body ground	Power switch on (IG)	Below 1 V
d1-12 (SVC2) - Body ground	Power switch on (IG)	Below 1 V

NG: REPAIR OR REPLACE FRONT SEAT WIRE RH

OK: Go To Next Step

CHECK FRONT SEAT WIRE RH (SHORT TO GROUND)

Turn the power switch off.
Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

Measure the resistance according to the value(s) in TESTER CONNECTION SPECIFIED CONDITION TABLE .

Fig 2: Checking Front Seat Wire RH (Short To Ground)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard resistance: for Power seat

TESTER CONNECTION SPECIFIED CONDITION TABLE

Tester connection	Condition	Specified condition
T11-5 (SVC3) - Body ground	Always	1 MΩ or Higher
T11-6 (SVC4) - Body ground	Always	1 MΩ or Higher
T11-11 (SVC1) - Body ground	Always	1 MΩ or Higher
T11-12 (SVC2) - Body ground	Always	1 MΩ or Higher

for Manual seat

TESTER CONNECTION SPECIFIED CONDITION

Tester connection	Condition	Specified condition
d1-5 (SVC3) - Body ground	Always	1 MΩ or Higher
d1-6 (SVC4) - Body ground	Always	1 MΩ or Higher
d1-11 (SVC1) - Body ground	Always	1 MΩ or Higher
d1-12 (SVC2) - Body ground	Always	1 MΩ or Higher

NG: REPAIR OR REPLACE FRONT SEAT WIRE RH

OK: Go To Next Step

CHECK FRONT SEAT WIRE RH (OPEN)

Measure the resistance according to the value(s) in TESTER CONNECTION SPECIFIED CONDITION TABLE .

Standard resistance: for Power seat

TESTER CONNECTION SPECIFIED CONDITION TABLE

Tester connection	Condition	Specified condition
T11-5 (SVC3) - T15-1 (SVC3)	Always	Below 1 Ω
T11-6 (SVC4) - T17-1 (SVC4)	Always	Below 1 Ω
T11-11 (SVC1) - T14-1 (SVC1)	Always	Below 1 Ω
T11-12 (SVC2) - T16-1 (SVC2)	Always	Below 1 Ω

Fig 3: Checking Front Seat Wire RH (Open)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

for Manual seat

TESTER CONNECTION SPECIFIED CONDITION

Tester connection	Condition	Specified condition
d1-5 (SVC3) - d3-1 (SVC3)	Always	Below 1 Ω
d1-6 (SVC4) - d5-1 (SVC4)	Always	Below 1 Ω
d1-11 (SVC1) - d2-1 (SVC1)	Always	Below 1 Ω
d1-12 (SVC2) - d4-1 (SVC2)	Always	Below 1 Ω

NG: REPAIR OR 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 TESTER CONNECTION SPECIFIED CONDITION TABLE .

Standard resistance: for Power seat

TESTER CONNECTION SPECIFIED CONDITION TABLE

Tester connection	Condition	Specified condition
T11-5 (SVC3) - T11-6 (SVC4)	Always	1 MΩ or Higher
T11-5 (SVC3) - T11-11 (SVC1)	Always	1 MΩ or Higher
T11-5 (SVC3) - T11-12 (SVC2)	Always	1 MΩ or Higher
T11-6 (SVC4) - T11-11 (SVC1)	Always	1 MΩ or Higher
T11-6 (SVC4) - T11-12 (SVC2)	Always	1 MΩ or Higher
T11-11 (SVC1) - T11-12 (SVC2)	Always	1 MΩ or Higher

Fig 4: Checking Front Seat Wire RH (Short)

for Manual seat

TESTER CONNECTION SPECIFIED CONDITION

Tester connection	Condition	Specified condition
d1-5 (SVC3) - d1-6 (SVC4)	Always	1 MΩ or Higher
d1-5 (SVC3) - d1-11 (SVC1)	Always	1 MΩ or Higher
d1-5 (SVC3) - d1-12 (SVC2)	Always	1 MΩ or Higher
d1-6 (SVC4) - d1-11 (SVC1)	Always	1 MΩ or Higher
d1-6 (SVC4) - d1-12 (SVC2)	Always	1 MΩ or Higher
d1-11 (SVC1) - d1-12 (SVC2)	Always	1 MΩ or Higher

NG: REPAIR OR REPLACE FRONT SEAT WIRE RH

OK: Go To Next Step

CHECK DTC
1. Connect the connectors to the occupant classification ECU and the 4 occupant classification sensors.
2. Connect the negative (-) terminal cable to the battery.
3. Turn the power 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 assembly (See DTC CHECK/CLEAR (2006/03-2006/10) ).
6. Turn the power switch off.
7. Turn the power switch on (IG).
8. Check the DTCs (See DTC CHECK/CLEAR ).
  OK: DTC B1793 is not output.
  
  HINT:
  
  Codes other than DTC B1793 may be output at this time, but they are not related to this check.
OK: USE SIMULATION METHOD TO CHECK (See DIAGNOSIS SYSTEM )

NG: Go To Next Step
REPLACE OCCUPANT CLASSIFICATION ECU
1. Turn the power switch off.
2. Disconnect the negative (-) terminal cable from the battery.
3. Replace the occupant classification ECU (See DTC CHECK/CLEAR ).
  HINT:
  
  Perform the inspection using parts from a normal vehicle if possible.
PERFORM ZERO POINT CALIBRATION
1. Connect the negative (-) terminal cable to the battery.
2. Connect the intelligent tester to the DLC3.
3. Turn the power switch on (IG).
4. Using the intelligent tester, perform "zero point calibration" (See INITIALIZATION ).
  OK: "COMPLETED" is displayed.
NG: Go to STEP 12

OK: Go To Next Step
PERFORM SENSITIVITY CHECK
1. Using the intelligent tester, perform "sensitivity check" (See INITIALIZATION ).
  Standard value: 27 to 33 kg (59.52 to 72.75 lb)
NG: Go to STEP 12

OK: Go To Next Step
CHECK DTC
1. Turn the power 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 assembly (See DTC CHECK/CLEAR (2006/03-2006/10) ).
4. Turn the power switch off.
5. Turn the power switch on (IG).
6. Check the DTCs (See DTC CHECK/CLEAR ).
  OK: DTC B1793 is not output.
  
  HINT:
  
  Codes other than DTC B1793 may be output at this time, but they are related to this check.
OK: END

NG: Go To Next Step
REPLACE FRONT SEAT ASSEMBLY RH
1. Turn the power switch off.
2. Disconnect the negative (-) terminal cable from the battery.
3. Replace the front seat assembly RH (See REMOVAL (2006/03-2006/10) for power seat or REMOVAL (2006/03-2006/10) for manual seat) .
PERFORM ZERO POINT CALIBRATION
1. Connect the negative (-) terminal cable to the battery.
2. Connect the intelligent tester to the DLC3.
3. Turn the power switch on (IG).
4. Using the intelligent tester, perform "zero point calibration" (See INITIALIZATION ).
  OK: "COMPLETED" is displayed.
PERFORM SENSITIVITY CHECK
1. Using the intelligent tester, perform "sensitivity check" (See INITIALIZATION ).
  Standard value: 27 to 33 kg (59.52 to 72.75 lb)
NEXT: END