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 |
Operation Check
OPERATION CHECK
1. AUTOMATIC LIGHT CONTROL SYSTEM OPERATION CHECK
(a) Turn the ignition switch to ON.
(b) Turn the headlight dimmer switch to the AUTO position.
(c) Cover the automatic light control sensor.
(d) Check that the taillights and low beam headl ...
Disposal
DISPOSAL
CAUTION / NOTICE / HINT
CAUTION:
Before performing pre-disposal deployment of any SRS part, review and closely
follow all applicable environmental and hazardous material regulations. Pre-disposal
deployment may be considered hazardous material ...