Supplemental Restraint Systems. Dtc B1655/37 Seat Belt Buckle Switch Rh Circuit Malfunction

for RHD:
The seat belt buckle switch RH circuit consists of the center airbag sensor and the front seat inner belt RH. DTC B1655/37 is stored when a malfunction is detected in the seat belt buckle switch RH circuit.
for LHD:
The seat belt buckle switch LH circuit consists of the center airbag sensor and the front seat inner belt LH.
DTC B1656/38 is recorded when a malfunction is detected in the seat belt buckle switch LH circuit.

for RHD
DTC Code	DTC Detection Condition	Trouble Area
B1655/37	When one of the following conditions is met: The center airbag sensor receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the seat belt buckle switch RH circuit for 2 seconds. A front seat inner belt RH malfunction. A center airbag sensor malfunction.	No. 2 floor wire Front seat inner belt assembly RH (Seat belt buckle switch RH) Center airbag sensor assembly

for LHD
DTC Code	DTC Detection Condition	Trouble Area
B1656/38	When one of the following conditions is met: The center airbag sensor receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the seat belt buckle switch LH circuit for 2 seconds. A front seat inner belt LH malfunction. A center airbag sensor malfunction.	Floor wire Front seat inner belt assembly LH (Seat belt buckle switch LH) Center airbag sensor assembly

WIRING DIAGRAM

Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System.
Dtc
B1655/37 Seat Belt Buckle Switch Rh Circuit Malfunction

INSPECTION PROCEDURE

NOTICE:

After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work (Click here).
When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Click here).
After replacing the center airbag sensor assembly, refer to initialization (Click here).

1.CHECK VEHICLE CONDITION

Check vehicle condition.
Result
Result
Proceed to
for LHD
A
for RHD
B

Result
Result	Proceed to
for LHD	A
for RHD	B

Go to step 9

A

2.CHECK FOR DTC

Turn the ignition switch to ON, and wait for at least 60 seconds.

Clear the DTCs (Click here).

Turn the ignition switch off.

Turn the ignition switch to ON, and wait for at least 60 seconds.

Check for DTCs (Click here).
OK:
DTC B1656 is not output.
HINT:
Codes other than DTC B1656 may be output at this time, but they are not related to this check.

Go to step 3

USE SIMULATION METHOD TO CHECK (Click here)

3.CHECK CONNECTION OF CONNECTORS

Turn the ignition switch off.

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

Check that the connectors are properly connected to the center airbag sensor and front seat inner belt LH.
OK:
The connectors are properly connected.

CONNECT CONNECTORS PROPERLY

OK

4.CHECK CONNECTORS

Disconnect the connectors from the center airbag sensor and the front seat inner belt LH.

Check that the connectors (on the center airbag sensor side and front seat inner belt LH side) are not damaged.
OK:
The connectors are not deformed or damaged.

REPLACE FLOOR WIRE

OK

5.CHECK FLOOR WIRE (CENTER AIRBAG SENSOR - FRONT SEAT INNER BELT LH)

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

Turn the ignition switch to ON.

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
K10-6 (LBE+) - Body ground
Ignition switch ON
Below 1 V
K10-7 (LBE-) - Body ground
Ignition switch ON
Below 1 V

w/ Side Airbag:
1. Turn the ignition switch off.
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Using a service wire, connect terminals 10 (LBE+) and 18 (LBE-) of connector B.
  NOTICE:
  Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.
4. Measure the resistance according to the value(s) in the table below.
  Standard Resistance:
  Tester Connection
  Condition
  Specified Condition
  K10-6 (LBE+) - K10-7 (LBE-)
  Always
  Below 1 Ω
5. Disconnect a service wire from connector B.
6. Measure the resistance according to the value(s) in the table below.
  Standard Resistance:
  Tester Connection
  Condition
  Specified Condition
  K10-6 (LBE+) - K10-7 (LBE-)
  Always
  1 MΩ or higher
  K10-6 (LBE+) - Body ground
  Always
  1 MΩ or higher
  K10-7 (LBE-) - Body ground
  Always
  1 MΩ or higher

w/o Side airbag:
1. Turn the ignition switch off.
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Using a service wire, connect terminals 11 (LBE+) and 12 (LBE-) of connector B.
  NOTICE:
  Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.
4. Measure the resistance according to the value(s) in the table below.
  Standard Resistance:
  Tester Connection
  Condition
  Specified Condition
  K10-6 (LBE+) - K10-7 (LBE-)
  Always
  Below 1 Ω
5. Disconnect a service wire from connector B.
6. Measure the resistance according to the value(s) in the table below.
  Standard Resistance:
  Tester Connection
  Condition
  Specified Condition
  K10-6 (LBE+) - K10-7 (LBE-)
  Always
  1 MΩ or higher
  K10-6 (LBE+) - Body ground
  Always
  1 MΩ or higher
  K10-7 (LBE-) - Body ground
  Always
  1 MΩ or higher

REPLACE FLOOR WIRE

OK

6.CHECK FRONT SEAT INNER BELT LH (SEAT BELT BUCKLE SWITCH)

Connect the connector to the center airbag sensor and the front seat inner belt LH.

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

Turn the ignition switch to ON, and wait for at least 60 seconds.

Clear the DTCs (Click here).

Turn the ignition switch off.

Turn the ignition switch to ON, and wait for at least 60 seconds.

Check for DTCs (Click here).
OK:
DTC B1656 is not output.
HINT:
Codes other than DTC B1656 may be output at this time, but they are not related to this check.

Go to step 7

USE SIMULATION METHOD TO CHECK (Click here)

7.REPLACE FRONT SEAT INNER BELT LH

Turn the ignition switch off.

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

Replace the front seat inner belt LH (Click here).
HINT:
Perform the inspection using parts from a normally functioning vehicle if possible.

NEXT

8.CHECK CENTER AIRBAG SENSOR

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

Turn the ignition switch to ON, and wait for at least 60 seconds.

Clear the DTCs (Click here).

Turn the ignition switch off.

Turn the ignition switch to ON, and wait for at least 60 seconds.

Check for DTCs (Click here).
OK:
DTC B1656 is not output.
HINT:
Codes other than DTC B1656 may be output at this time, but they are not related to this check.

REPLACE CENTER AIRBAG SENSOR ASSEMBLY (Click here)

REPLACE FRONT SEAT INNER BELT ASSEMBLY LH (Click here)

9.CHECK FOR DTC

Turn the ignition switch to ON, and wait for at least 60 seconds.

Clear the DTCs (Click here).

Turn the ignition switch off.

Turn the ignition switch to ON, and wait for at least 60 seconds.

Check for DTCs (Click here).
OK:
DTC B1655 is not output.
HINT:
Code other than DTC B1655 may be output at this time, but they are not related to this check.

Go to step 10

USE SIMULATION METHOD TO CHECK (Click here)

10.CHECK CONNECTION OF CONNECTORS

Turn the ignition switch off.

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

Check that the connectors are properly connected to the center airbag sensor and front seat inner belt RH.
OK:
The connectors are properly connected.

CONNECT CONNECTORS PROPERLY

OK

11.CHECK CONNECTORS

Disconnect the connectors from the center airbag sensor and the front seat inner belt RH.

Check that the connectors (on the center airbag sensor side and front seat inner belt RH side) are not damaged.
OK:
The connectors are not deformed or damaged.

REPLACE NO. 2 FLOOR WIRE

OK

12.CHECK NO. 2 FLOOR WIRE (CENTER AIRBAG SENSOR - FRONT SEAT INNER BELT RH)

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

Turn the ignition switch to ON.

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
L33-6 (RBE+) - Body ground
Ignition switch ON
Below 1 V
L33-7 (RBE-) - Body ground
Ignition switch ON
Below 1 V

w/ Side Airbag:
1. Turn the ignition switch off.
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Using a service wire, connect terminals 15 (RBE+) and 23 (RBE-) of connector B.
  NOTICE:
  Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.
4. Measure the resistance according to the value(s) in the table below.
  Standard Resistance:
  Tester Connection
  Condition
  Specified Condition
  L33-6 (RBE+) - L33-7 (RBE-)
  Always
  Below 1 Ω
5. Disconnect a service wire from connector B.
6. Measure the resistance according to the value(s) in the table below.
  Standard Resistance:
  Tester Connection
  Condition
  Specified Condition
  L33-6 (RBE+) - L33-7 (RBE-)
  Always
  1 MΩ or higher
  L33-6 (RBE+) - Body ground
  Always
  1 MΩ or higher
  L33-7 (RBE-) - Body ground
  Always
  1 MΩ or higher

w/o Side airbag:
1. Turn the ignition switch off.
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Using a service wire, connect terminals 15 (RBE+) and 14 (RBE-) of connector B.
  NOTICE:
  Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.
4. Measure the resistance according to the value(s) in the table below.
  Standard Resistance:
  Tester Connection
  Condition
  Specified Condition
  L33-6 (RBE+) - L33-7 (RBE-)
  Always
  Below 1 Ω
5. Disconnect a service wire from connector B.
6. Measure the resistance according to the value(s) in the table below.
  Standard Resistance:
  Tester Connection
  Condition
  Specified Condition
  L33-6 (RBE+) - L33-7 (RBE-)
  Always
  1 MΩ or higher
  L33-6 (RBE+) - Body ground
  Always
  1 MΩ or higher
  L33-7 (RBE-) - Body ground
  Always
  1 MΩ or higher

REPLACE NO. 2 FLOOR WIRE

OK

13.CHECK FRONT SEAT INNER BELT RH (SEAT BELT BUCKLE SWITCH)

Connect the connector to the center airbag sensor and the front seat inner belt RH.

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

Turn the ignition switch to ON, and wait for at least 60 seconds.

Clear the DTCs (Click here).

Turn the ignition switch off.

Turn the ignition switch to ON, and wait for at least 60 seconds.

Check for DTCs (Click here).
OK:
DTC B1655 is not output.
HINT:
Codes other than DTC B1655 may be output at this time, but they are not related to this check.

Go to step 14

USE SIMULATION METHOD TO CHECK (Click here)

14.REPLACE FRONT SEAT INNER BELT RH

Turn the ignition switch off.

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

Replace the front seat inner belt RH (Click here).
HINT:
Perform the inspection using parts from a normally functioning vehicle if possible.

NEXT

15.CHECK CENTER AIRBAG SENSOR

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

Turn the ignition switch to ON, and wait for at least 60 seconds.

Clear the DTCs (Click here).

Turn the ignition switch off.

Turn the ignition switch to ON, and wait for at least 60 seconds.

Check for DTCs (Click here).
OK:
DTC B1655 is not output.
HINT:
Codes other than DTC B1655 may be output at this time, but they are not related to this check.

REPLACE CENTER AIRBAG SENSOR ASSEMBLY (Click here)

REPLACE FRONT SEAT INNER BELT ASSEMBLY RH

Tester Connection	Switch Condition	Specified Condition
K10-6 (LBE+) - Body ground	Ignition switch ON	Below 1 V
K10-7 (LBE-) - Body ground	Ignition switch ON	Below 1 V

Tester Connection	Condition	Specified Condition
K10-6 (LBE+) - K10-7 (LBE-)	Always	Below 1 Ω