DESCRIPTION
The seat belt buckle switch LH circuit consists of the center airbag sensor and front seat inner belt LH.
DTC B1656/37 is stored when a malfunction is detected in the seat belt buckle switch LH circuit.
DTC Code |
DTC Detection Condition |
Trouble Area |
---|---|---|
B1656/38 |
One of the following conditions is met:
|
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected (See page ).
PROCEDURE
1. |
CHECK FOR DTC |
(a) Turn the ignition switch to ON.
(b) Clear the DTCs (See page ).
(c) Turn the ignition switch off.
(d) Turn the ignition switch to ON, and wait for at least 60 seconds.
(e) Check for DTCs (See page ).
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.
OK |
USE SIMULATION METHOD TO CHECK |
|
2. |
CHECK CONNECTION OF CONNECTORS |
(a) Turn the ignition switch off.
(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(c) Check that the connectors are properly connected to the center airbag sensor and front seat inner belt LH.
OK:
The connectors are properly connected.
NG |
CONNECT CONNECTORS PROPERLY |
|
3. |
CHECK CONNECTORS |
(a) Disconnect the connectors from the center airbag sensor and front seat inner belt LH.
(b) 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. Text in Illustration
|
|
NG |
REPLACE NO. 2 FLOOR WIRE |
|
4. |
CHECK NO. 2 FLOOR WIRE (CENTER AIRBAG SENSOR - FRONT SEAT INNER BELT LH) |
(a) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
Text in Illustration
*1 |
Front Seat Inner Belt LH |
*2 |
Center Airbag Sensor |
*3 |
No. 2 Floor Wire |
*4 |
Connector C |
*5 |
Connector B |
- |
- |
*a |
Front view of wire harness connector (to Front Seat Inner Belt LH) |
*b |
Rear view of wire harness connector (to Center Airbag Sensor) |
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
O3-2 (LBE+) - Body ground |
Ignition switch ON |
Below 1 V |
O3-1 (LBE-) - Body ground |
Ignition switch ON |
Below 1 V |
(c) Turn the ignition switch off.
(d) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
O3-2 (LBE+) - O1-10 (LBE+) |
Always |
Below 1 Ω |
O3-2 (LBE+) - Body ground |
Always |
1 MΩ or higher |
O3-1 (LBE-) - O1-18 (LBE-) |
Always |
Below 1 Ω |
O3-1 (LBE-) - Body ground |
Always |
1 MΩ or higher |
NG |
REPLACE NO. 2 FLOOR WIRE |
|
5. |
CHECK FRONT SEAT INNER BELT LH (SEAT BELT BUCKLE SWITCH) |
(a) Connect the connectors to the center airbag sensor and front seat inner belt LH. |
|
(b) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(c) Turn the ignition switch to ON, and wait for at least 60 seconds.
(d) Clear the DTCs (See page ).
(e) Turn the ignition switch off.
(f) Turn the ignition switch to ON, and wait for at least 60 seconds.
(g) Check for DTCs (See page ).
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.
Text in Illustration
*1 |
Front Seat Inner Belt LH |
*2 |
Center Airbag Sensor |
OK |
USE SIMULATION METHOD TO CHECK |
|
6. |
REPLACE FRONT SEAT INNER BELT ASSEMBLY LH |
(a) Turn the ignition switch off.
(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(c) Replace the front seat inner belt LH (See page ).
HINT:
Perform the inspection using parts from a normally functioning vehicle if possible.
|
7. |
CHECK CENTER AIRBAG SENSOR |
(a) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds. |
|
(b) Turn the ignition switch to ON, and wait for at least 60 seconds.
(c) Clear the DTCs (See page ).
(d) Turn the ignition switch off.
(e) Turn the ignition switch to ON, and wait for at least 60 seconds.
(f) Check for DTCs (See page ).
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.
Text in Illustration
*1 |
Front Seat Inner Belt LH |
*2 |
Center Airbag Sensor |
OK |
REPLACE FRONT SEAT INNER BELT ASSEMBLY LH |
NG |
REPLACE CENTER AIRBAG SENSOR ASSEMBLY |
If the electronic key does not operate properly (vehicles with a smart key
system)
If communication between the electronic key and vehicle is interrupted
or the electronic key cannot be used because the battery is depleted, the smart
key system and wireless remote control cannot be used. In such cases, the doors
can be opened and ...
Removal
REMOVAL
PROCEDURE
1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-)
battery terminal to disable the SRS system.
NOTICE:
When disconnecting the cable, some systems ne ...