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

1. Turn the ignition switch on (IG), and wait for at least 60 seconds.
   Fig 1: Identifying DLC3 Connector Terminal Identification

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

   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.

OK → See step   11 

NG: Go to next step 

1. Turn the ignition switch off.
2. Disconnect the negative (-) terminal cable from the battery, 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.

NG → CONNECT CONNECTORS PROPERLY, THEN GO TO   1 STEP 1 

OK: Go to next step 

1. Disconnect the connectors from the center airbag sensor assembly and the front seat inner belt assembly LH.
2. Check that the connectors (on the center airbag sensor assembly side and front seat inner belt assembly LH side) are not damaged.

   OK

   The connectors are not deformed or damaged.

NG → REPAIR OR REPLACE FLOOR WIRE 

OK: Go to next step 

1. Using a service wire, connect terminals 11 (DBE+) and 12 (DBE-) of connector B.
   Fig 2: Identifying Floor Wire (Open) Connector Terminal Identification

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   NOTE:

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

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

   Standard resistance

   Tester Connection	Condition	Specified Condition
   N3-1 (LBE+) - N3-3 (LBE-)	Always	Below 1 Ω

NG → REPAIR OR REPLACE FLOOR WIRE 

OK: Go to next step 

1. Disconnect the service wire from connector B.
   Fig 3: Identifying Floor Wire Connector Terminal Identification

   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
   N3-1 (LBE+) - N3-3 (LBE-)	Always	1 MΩ or higher

NG → REPAIR OR REPLACE FLOOR WIRE 

OK: Go to next step 

1. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
   Fig 4: Identifying Floor Wire Connector Terminal Identification

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

   Standard voltage

   Tester Connection	Condition	Specified Condition
   N3-1 (LBE+) - Body ground	Ignition switch on (IG)	Below 1 V
   N3-3 (LBE-) - Body ground	Ignition switch on (IG)	Below 1 V

NG → REPAIR OR REPLACE FLOOR WIRE 

OK: Go to next step 

1. Turn the ignition switch off.
   Fig 5: Connector Terminal Identification Floor Wire Connector Terminal Identification

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the negative (-) terminal cable from the battery, 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
   N3-1 (LBE+) - Body ground	Always	1 MΩ or higher
   N3-3 (LBE-) - Body ground	Always	1 MΩ or higher

NG → REPAIR OR REPLACE FLOOR WIRE 

OK: Go to next step 

1. Connect the connector to the center airbag sensor assembly and the front seat inner belt assembly LH.
   Fig 6: Identifying DLC3 Connector Terminal Identification

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
3. Turn the ignition switch on (IG), 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 on (IG), and wait for at least 60 seconds.
7. Check the 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.

OK → See step   11 

NG: Go to next step 

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

   HINT: 

   Perform inspection using parts from a normal vehicle if possible.

NEXT: Go to next step 

1. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
   Fig 7: Identifying DLC3 Connector Terminal Identification

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the ignition switch on (IG), 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 on (IG), and wait for at least 60 seconds.
6. Check the 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   12 

OK → END