AIRBAG SYSTEM, Diagnostic DTC:B1650/32

DTC Code DTC Name
B1650/32 Occupant Detection Sensor Circuit Malfunction

DESCRIPTION

The occupant detection sensor circuit consists of the center airbag sensor assembly and the occupant detection sensor.

If the center airbag sensor assembly receives signals from the occupant detection sensor, it determines whether the front passenger airbag, the front passenger seat outer belt should be operated.

DTC B1650/32 is recorded when a malfunction is detected in the occupant detection sensor circuit.

DTC Code Detection Condition Trouble Area
B1650/32

One of the following conditions is met:


  • Occupant detection sensor circuit

  • The center airbag sensor assembly receives a line short circuit signal, an open signal, a short circuit to B+ signal in the occupant detection sensor circuit for 2 seconds

  • Center airbag sensor assembly malfunction

  • Floor wire (for LHD)

  • No. 2 floor wire (for RHD)

  • Occupant detection sensor

  • Center airbag sensor assembly

WIRING DIAGRAM

A01GW2QE05
A01GW2QE06

INSPECTION PROCEDURE

Note


  • After turning the power switch OFF, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Click here.

  • When disconnecting the cable from the negative (-) auxiliary battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected Click here.

PROCEDURE


  1. CHECK FOR DTC

    A01H1RYE04

    1. Turn the power switch ON (IG), and wait for at least 60 seconds.

    2. Clear the DTCs Click here.

    3. Turn the power switch OFF.

    4. Turn the power switch ON (IG), and wait for at least 60 seconds.

    5. Check for DTCs Click here.

      OK
      DTC B1650 is not output.

      Tech Tips

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


    NG

    CHECK CONNECTION OF CONNECTORS Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  2. CHECK CONNECTION OF CONNECTORS


    1. Turn the power switch OFF.

    2. Disconnect the negative (-) terminal cable from the auxiliary battery, and wait for at least 90 seconds.

    3. Check that the connectors are properly connected to the center airbag sensor assembly and the occupant detection sensor.

      OK
      The connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  3. CHECK CONNECTORS


    1. Disconnect the connectors from the center airbag sensor assembly and the occupant detection sensor.

    2. Check that the connectors (on the center airbag sensor assembly side and the occupant detection sensor side) are not damaged.

      OK
      The connectors are not deformed or damaged.

    NG

    REPLACE FLOOR WIRE

    OK

  4. CHECK VEHICLE TYPE


    1. Confirm the vehicle type.

      Result
      Result Proceed to
      for LHD A
      for RHD B

    B

    CHECK OCCUPANT DETECTION SENSOR CIRCUIT Click here

    A

  5. CHECK OCCUPANT DETECTION SENSOR CIRCUIT

    A01H0OOE03

    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
      R49-2 (FSR+) - R49-4 (FSR-) Always Below 1Ω

    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
      R49-2 (FSR+) - R49-4 (FSR-) Always 1MΩ or higher
      R49-2 (FSR+) - Body ground Always 1MΩ or higher
      R49-4 (FSR-) - Body ground Always 1MΩ or higher

    5. Connect the negative (-) terminal cable to the auxiliary battery, and wait for at least 2 seconds.

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

      Tester Connection Switch Condition Specified Condition
      R49-2 (FSR+) - Body ground Power switch ON (IG) Below 1 V
      R49-4 (FSR-) - Body ground Power switch ON (IG) Below 1 V

    NG

    REPLACE FLOOR WIRE

    OK

  6. CHECK OCCUPANT DETECTION SENSOR

    A01GW8KE03

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

      Note

      Connect the positive tester lead to terminal FSR+, and the negative tester lead to terminal FSR-.

      Standard resistance
      Tester Connection Condition Specified Condition

      Tester positive (+) → Terminal 2 (FSR+)

      Tester negative (-) → Terminal 4 (FSR-)

      		 Weight 15 kg (33 lb) applied 50k Ω or less

      Tester positive (+) → Terminal 2 (FSR+)

      Tester negative (-) → Terminal 4 (FSR-)

      		 No weight applied 50k Ω or higher

    NG

    REPLACE FRONT PASSENGER SIDE SEAT CUSHION PAD Click here

    OK

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

  7. CHECK OCCUPANT DETECTION SENSOR CIRCUIT

    A01GWVXE03

    1. Turn the power switch OFF.

    2. Disconnect the negative (-) terminal cable from the auxiliary battery, and wait for at least 90 seconds.

    3. Disconnect the floor wire connector from the center airbag sensor assembly.

    4. Using a service wire, connect terminal 9 (FSL+) and 19 (FSL-) 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
      S17-9 (FSL+) - S17-19 (FSL-) Always Below 1Ω

    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
      S17-9 (FSL+) - S17-19 (FSL-) Always 1MΩ or higher
      S17-9 (FSL+) - Body ground Always 1MΩ or higher
      S17-19 (FSL-) - Body ground Always 1MΩ or higher

    8. Connect the negative (-) terminal cable to the auxiliary battery, and wait for at least 2 seconds.

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

      Tester Connection Switch Condition Specified Condition
      S17-9 (FSL+) - Body ground Power switch ON (IG) Below 1 V
      S17-19 (FSL-) - Body ground Power switch ON (IG) Below 1 V

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  8. CHECK OCCUPANT DETECTION SENSOR

    A01GW9SE03

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

      Note

      Connect the positive tester lead to terminal FSL+, and the negative tester lead to terminal FSL-.

      Standard resistance
      Tester Connection Condition Specified Condition

      Tester positive (+) → Terminal 2 (FSR+)

      Tester negative (-) → Terminal 4 (FSR-)

      		 Weight 15 kg (33 lb) applied 50k Ω or less

      Tester positive (+) → Terminal 2 (FSR+)

      Tester negative (-) → Terminal 4 (FSR-)

      		 No weight applied 50k Ω or higher

    NG

    REPLACE FRONT PASSENGER SIDE SEAT CUSHION PAD Click here

    OK

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here