DTC B1650/32: Occupant Classification System Malfunction (08/2011 - ): Procedure

1. Turn the engine switch on (IG), and wait for at least 10 seconds.
2. Check for DTCs of the occupant classification ECU. Refer to DTC CHECK / CLEAR .

   OK

   DTC is not output.

NG → See step   7 

OK: Go to next step 

Fig 1: Checking For DTC (Center Airbag Sensor)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Turn the engine switch on (IG), and wait for at least 60 seconds.
2. Clear the DTCs. Refer to DTC CHECK / CLEAR .
3. Turn the engine switch off.
4. Turn the engine switch on (IG), and wait for at least 60 seconds.
5. Check for DTCs. Refer to DTC CHECK / CLEAR .

   OK

   DTC B1650 is not output.

   HINT: 

   Codes other than DTC B1650 may be output at this time, but they are not related to this check.

NG → See step   3 

OK → See step   8 

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 and the occupant classification ECU.

   OK

   The connectors are properly connected.

NG → CONNECT CONNECTORS PROPERLY 

OK: Go to next step 

1. Disconnect the connectors from the center airbag sensor and the occupant classification ECU.
2. Check that the connectors (on the center airbag sensor side and occupant classification ECU side) are not damaged.

   OK

   The connectors are not deformed or damaged.

NG → REPLACE HARNESS AND CONNECTOR 

OK: Go to next step 

Fig 2: Identifying Occupant Classification ECU Connector Terminal C8

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Using a service wire, connect terminals 16 (FSR+) and 22 (FSR-) of connector B.
   NOTE:

   Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   c8-11 (FSR+) - c8-12 (FSR-)	Always	Below 1 Ω

3. Disconnect the service wire from connector B.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   c8-11 (FSR+) - c8-12 (FSR-)	Always	1 MΩ or higher
   c8-11 (FSR+) - Body ground	Always	1 MΩ or higher
   c8-12 (FSR-) - Body ground	Always	1 MΩ or higher

5. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
6. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   c8-11 (FSR+) - Body ground	Engine switch on (IG)	Below 1 V
   c8-12 (FSR-) - Body ground	Engine switch on (IG)	Below 1 V

NG → See step   6 

OK → See step   9 

Fig 3: Identifying Center Airbag Sensor L27 & Front Seat Wire Lc2 Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 No. 2 floor wire.
4. Using a service wire, connect terminals 16 (FSR+) and 22 (FSR-) of connector B.
   NOTE:

   Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Lc2-6 (FSR+) - Lc2-7 (FSR-)	Always	Below 1 Ω

6. Disconnect the service wire from connector B.
7. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Lc2-6 (FSR+) - Lc2-7 (FSR-)	Always	1 MΩ or higher
   Lc2-6 (FSR+) - Body ground	Always	1 MΩ or higher
   Lc2-7 (FSR-) - Body ground	Always	1 MΩ or higher

8. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
9. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   Lc2-6 (FSR+) - Body ground	Engine switch on (IG)	Below 1 V
   Lc2-7 (FSR-) - Body ground	Engine switch on (IG)	Below 1 V

NG → REPLACE NO. 2 FLOOR WIRE 

OK → REPLACE FRONT SEAT WIRE RH