Inspection Procedure

1. Turn the engine switch on (IG)
2. Using the Techstream, check for DTCs of the occupant classification ECU (See DTC CHECK / CLEAR  )

NG: REPAIR CIRCUITS INDICATED BY OUTPUT DTCS  (See DIAGNOSTIC TROUBLE CODE CHART  )

OK: Go to next step 

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 center airbag sensor assembly and the occupant classification ECU Also check that the connectors that link the front seat wire RH and floor 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

4. Disconnect the connectors from the center airbag sensor assembly and the occupant classification ECU Also disconnect the connectors that link the front seat wire RH and floor wire
5. Check that the terminals of connectors are not damaged

   OK: The terminals are not deformed or damaged. 

NG: REPLACE WIRE HARNESS 

OK: Go to next step 

1. Using SST, connect terminals 12 (FSP+) and 13 (FSP-) of connector B.
   NOTE: Do not forcibly insert SST into the terminals of the connector when connecting the wire.

   SST 09843-18040 

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

   Standard Resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   T16-11 (FSR+) - T16-12 (FSR-)	Always	Below 1 Ω

Fig 1: Identifying Occupant Classification System Circuit (Open)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to step  7

OK: Go to next step 

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

   Standard Resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   T16-11 (FSR+) - T16-12 (FSR-)	Always	1 MΩ or higher

Fig 2: Identifying Occupant Classification System Circuit (Short)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to step  8

OK: Go to next step 

1. Connect the cable to the negative (-) battery terminal
2. Turn the engine switch on (IG)
3. 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
   T16-11 (FSR+) - Body ground	Engine switch on (IG)	Below 1 V
   T16-12 (FSR-) - Body ground	Engine switch on (IG)	Below 1 V

Fig 3: Identifying Occupant Classification System Circuit (Short To B+)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to step  9

OK: Go to next step 

1. Turn the engine switch off.
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   T16-11 (FSR+) - Body ground	Always	1 MΩ or higher
   T16-12 (FSR-) - Body ground	Always	1 MΩ or higher

   HINT:

   After replacing the center airbag sensor assembly, check for DTCs of the center airbag sensor assembly. If DTC B1650/32 is detected, replace the occupant classification ECU (See REMOVAL  ) and perform "zero point calibration" and "sensitivity check" of the occupant classification system (See INITIALIZATION  ).

   Fig 4: Identifying Occupant Classification System Circuit (Short To Ground)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to step  10

OK: REPLACE CENTER AIRBAG SENSOR ASSEMBLY  (See REMOVAL  )

1. Disconnect the front seat wire RH connector from the floor wire
   Fig 5: Identifying Floor Wire (Open)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   SST has already been inserted into connector B.

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

   Standard Resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   PT2-3 (FSR+) - PT2-8 (FSR-)	Always	Below 1 Ω

NG: REPLACE FLOOR WIRE 

OK: REPLACE FRONT SEAT WIRE RH 

1. Disconnect the front seat wire RH connector from the floor wire
2. Measure the resistance according to the value(s) in the table below

   Standard Resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   PT2-3 (FSR+) - PT2-8 (FSR-)	Always	1 MΩ or higher

Fig 6: Identifying Floor Wire (Short)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE FLOOR WIRE 

OK: REPLACE FRONT SEAT WIRE RH 

1. Turn the engine switch off
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds
3. Disconnect the front seat wire RH connector from the floor wire
4. Connect the cable to the negative (-) battery terminal
5. Turn the engine switch on (IG).
6. 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
   PT2-3 (FSR+) - Body ground	Engine switch on (IG)	Below 1 V
   PT2-8 (FSR-) - Body ground	Engine switch on (IG)	Below 1 V

Fig 7: Identifying Floor Wire (Short To B+)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE FLOOR WIRE 

OK: REPLACE FRONT SEAT WIRE RH 

1. Disconnect the front seat wire RH connector from the floor wire.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   PT2-3 (FSR+) - Body ground	Always	1 MΩ or higher
   PT2-8 (FSR-) - Body ground	Always	1 MΩ or higher

Fig 8: Identifying Floor Wire (Short To Ground)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE FLOOR WIRE 

OK: REPLACE FRONT SEAT WIRE RH