DTC B1655/37: Driver Side Seat Belt Buckle Switch Circuit Malfunction: Procedure

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 front seat inner belt assembly LH.

   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 front seat inner belt assembly LH.
5. Check that the terminals of the connectors are not damaged.

   OK

   The terminals are not deformed or damaged.

NG → REPLACE FLOOR WIRE 

OK: Go to next step 

1. Using SST, connect terminals 11 (LBE+) and 12 (LBE-) of connector B.
   Fig 1: Checking Floor Wire Using SST (Open)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   NOTE:

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

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L15-2 (LBE+) - L15-4 (LBE-)	Always	Below 1 Ω

NG → REPLACE FLOOR WIRE 

OK: Go to next step 

1. Disconnect SST from connector B.
   Fig 2: Checking Floor Wire And L15 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
   L15-2 (LBE+) - L15-4 (LBE-)	Always	1 MΩ or higher

NG → REPLACE FLOOR WIRE 

OK: Go to next step 

1. Connect the cable to the negative (-) battery terminal.
   Fig 3: Checking Floor Wire And L15 Connector Terminals

   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
   L15-2 (LBE+) - Body ground	Ignition switch ON	Below 1 V
   L15-4 (LBE-) - Body ground	Ignition switch ON	Below 1 V

NG → REPLACE FLOOR WIRE 

OK: Go to next step 

1. Turn the ignition switch off.
   Fig 4: Checking Floor Wire And L15 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. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L15-2 (LBE+) - Body ground	Always	1 MΩ or higher
   L15-4 (LBE-) - Body ground	Always	1 MΩ or higher

NG → REPLACE FLOOR WIRE 

OK: Go to next step 

1. Connect the connectors to the center airbag sensor assembly and the front seat inner belt assembly LH.
   Fig 5: Checking Front Seat Inner Belt Assembly LH

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect the cable to the negative (-) battery terminal.
3. Turn the ignition switch to ON, and wait for at least 60 seconds.
4. Clear the DTCs stored in the memory. Refer to DTC CHECK / CLEAR .
5. Turn the ignition switch off.
6. Turn the ignition switch to ON, and wait for at least 60 seconds.
7. Check for DTCs. Refer to DTC CHECK / CLEAR .

   OK

   DTC B1655/37 is not output.

   HINT: 

   Codes other than DTC B1655/37 may be output at this time, but they are not related to this check.

NG → See step   7 

OK → See step   9 

1. Turn the ignition switch off.
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Replace the front seat inner belt assembly LH with a known good part. Refer to REMOVAL .

   HINT: 

   Perform the following inspection using known good parts from another vehicle if possible.

NEXT: Go to next step 

1. Connect the cable to the negative (-) battery terminal.
   Fig 6: Checking Center Airbag Sensor Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the ignition switch to ON, and wait for at least 60 seconds.
3. Clear the DTCs stored in the memory. Refer to DTC CHECK / CLEAR .
4. Turn the ignition switch off.
5. Turn the ignition switch to ON, and wait for at least 60 seconds.
6. Check for DTCs. Refer to DTC CHECK / CLEAR .

   OK

   DTC B1655/37 is not output.

   HINT: 

   Codes other than DTC B1655/37 may be output at this time, but they are not related to this check.

NG → See step   10 

OK → END