DESCRIPTION
The seat belt buckle switch LH circuit consists of the airbag sensor assembly and seat belt buckle switch LH (front seat inner belt assembly LH).
DTC B1656/38 is stored when a malfunction is detected in the seat belt buckle switch LH circuit.
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Test Mode / Check Mode |
---|---|---|---|---|
B1656/38 |
Seat Belt Buckle Switch LH Circuit Malfunction |
|
|
Does not apply to test/check mode |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.
Click here
PROCEDURE
1. |
CHECK CONNECTORS |
(a) Turn the ignition switch off.
(b) Disconnect the cable from the negative (-) battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
(c) Check that the connectors are properly connected to the airbag sensor assembly and front seat inner belt assembly LH.
OK:
The connectors are properly connected.
HINT:
If the connectors are not properly connected, reconnect the connectors and proceed to the next inspection.
(d) Disconnect the connectors from the airbag sensor assembly and front seat inner belt assembly LH.
(e) Check that the terminals of the connectors are not deformed or damaged.
OK:
The terminals are not deformed or damaged.
NG | ![]() |
REPLACE FLOOR WIRE |
|
2. |
CHECK FLOOR WIRE (OPEN) |
(a) 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 the wire. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
M101-2 (LBE+) - M101-1 (LBE-) |
Always |
Below 1 Ω |
(c) Disconnect the service wire from connector B.
NG | ![]() |
REPLACE FLOOR WIRE |
|
3. |
CHECK FLOOR WIRE (SHORT) |
(a) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
NG | ![]() |
REPLACE FLOOR WIRE |
|
4. |
CHECK FLOOR WIRE (SHORT TO B+) |
(a) Connect the cable to the negative (-) battery terminal. |
|
(b) Turn the ignition switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
M101-2 (LBE+) - Body ground |
Ignition switch on (IG) |
Below 1 V |
M101-1 (LBE-) - Body ground |
Ignition switch on (IG) |
Below 1 V |
(d) Turn the ignition switch off.
(e) Disconnect the cable from the negative (-) battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
NG | ![]() |
REPLACE FLOOR WIRE |
|
5. |
CHECK FLOOR WIRE (SHORT TO GROUND) |
(a) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
NG | ![]() |
REPLACE FLOOR WIRE |
|
6. |
CHECK DTC |
(a) Connect the connectors to the airbag sensor assembly and front seat inner belt assembly LH. |
|
(b) Connect the cable to the negative (-) battery terminal.
(c) Clear the DTCs stored in memory.
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(d) Turn the ignition switch off.
(e) Turn the ignition switch on (IG), and wait for at least 60 seconds.
(f) Check for DTCs.
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OK:
DTC B1656/38 is not output.
HINT:
Codes other than DTC B1656/38 may be output at this time, but they are not related to this check.
OK | ![]() |
USE SIMULATION METHOD TO CHECK |
|
7. |
CHECK FRONT SEAT INNER BELT ASSEMBLY LH |
(a) Turn the ignition switch off. |
|
(b) Disconnect the cable from the negative (-) battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
(c) Replace the front seat inner belt assembly LH with a known good one.
Click here
HINT:
Perform the following inspection using known good parts from another vehicle if possible.
(d) Connect the cable to the negative (-) battery terminal.
(e) Clear the DTCs stored in memory.
Click here
(f) Turn the ignition switch off.
(g) Turn the ignition switch on (IG), and wait for at least 60 seconds.
(h) Check for DTCs.
Click here
OK:
DTC B1656/38 is not output.
HINT:
Codes other than DTC B1656/38 may be output at this time, but they are not related to this check.
(i) Turn the ignition switch off.
(j) Disconnect the cable from the negative (-) battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
(k) Restore the front seat inner belt assembly LH that was installed for testing to its original location.
Click here
OK | ![]() |
REPLACE FRONT SEAT INNER BELT ASSEMBLY LH
|
NG | ![]() |
REPLACE AIRBAG SENSOR ASSEMBLY |
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ILLUSTRATION
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