DTC B1650/32: Occupant Classification System Malfunction: Procedure

1. Turn the ignition switch to ON.
2. Using the Techstream, check for occupant classification ECU DTCs. Refer to DTC CHECK / CLEAR .

NG → See step   12 

OK: Go to next step 

1. Turn the ignition 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 No. 2 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 No. 2 floor wire.
5. Check that the terminals of the connectors are not damaged.

   OK

   The terminals are not deformed or damaged.

NG → REPLACE WIRE HARNESS 

OK: Go to next step 

1. Connect the connectors that link the front seat wire RH and No. 2 floor wire.
   Fig 1: Checking Occupant Classification System Circuit Using SST (Open)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Using SST, connect terminals 12 (FSR+) and 13 (FSR-) of connector B.
   NOTE:

   Do not forcibly insert SST into the terminals of the connector.

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   S2-11 (FSR+) - S2-12 (FSR-)	Always	Below 1 Ω

NG → See step   7 

OK: Go to next step 

1. Disconnect SST from connector B.
   Fig 2: Checking Occupant Classification System Circuit

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   S2-11 (FSR+) - S2-12 (FSR-)	Always	1 MΩ or higher

NG → See step   8 

OK: Go to next step 

1. Connect the cable to the negative (-) battery terminal.
   Fig 3: Checking Occupant Classification System Circuit

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   S2-11 (FSR+) - Body ground	Ignition switch ON	Below 1 V
   S2-12 (FSR-) - Body ground	Ignition switch ON	Below 1 V

NG → See step   9 

OK: Go to next step 

1. Turn the ignition switch off.
   Fig 4: Checking Occupant Classification System Circuit

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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	Condition	Specified Condition
   S2-11 (FSR+) - Body ground	Always	1 MΩ or higher
   S2-12 (FSR-) - Body ground	Always	1 MΩ or higher

   HINT: 

   After replacing the center airbag sensor assembly, check for DTCs. If DTC B1650/32 is detected, replace the front seat cushion assembly (with occupant classification ECU and occupant classification sensor). Refer to REMOVAL and perform Initialization. Refer to INITIALIZATION of the occupant classification system.

NG → See step   10 

OK → See step   11 

1. Disconnect the front seat wire RH connector from the No. 2 floor wire.
   Fig 5: Checking No. 2 Floor Wire Using SST (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	Condition	Specified Condition
   MS1-5 (FSR+) - MS1-10 (FSR-)	Always	Below 1 Ω

NG → REPLACE NO. 2 FLOOR WIRE 

OK → REPLACE FRONT SEAT WIRE RH 

1. Disconnect the front seat wire RH connector from the No. 2 floor wire.
   Fig 6: Checking No. 2 Floor Wire And MS1 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   MS1-5 (FSR+) - MS1-10 (FSR-)	Always	1 MΩ or higher

NG → REPLACE NO. 2 FLOOR WIRE 

OK → REPLACE FRONT SEAT WIRE RH 

1. Turn the ignition switch off.
   Fig 7: Checking No. 2 Floor Wire And MS1 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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 No. 2 floor wire.
4. Connect the cable to the negative (-) battery terminal.
5. Turn the ignition switch to ON.
6. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   MS1-5 (FSR+) - Body ground	Ignition switch ON	Below 1 V
   MS1-10 (FSR-) - Body ground	Ignition switch ON	Below 1 V

NG → REPLACE NO. 2 FLOOR WIRE 

OK → REPLACE FRONT SEAT WIRE RH 

1. Disconnect the front seat wire RH connector from the No. 2 floor wire.
   Fig 8: Checking No. 2 Floor Wire And MS1 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   MS1-5 (FSR+) - Body ground	Always	1 MΩ or higher
   MS1-10 (FSR-) - Body ground	Always	1 MΩ or higher

NG → REPLACE NO. 2 FLOOR WIRE 

OK → REPLACE FRONT SEAT WIRE RH