Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM100000001G4PT |
Model Year Start: 2020 |
Model: Corolla |
Prod Date Range: [01/2019 - 09/2022] |
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (for HV Model): B1656; Seat Belt Buckle Switch (LH); 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022] |
DTC
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B1656
|
Seat Belt Buckle Switch (LH)
|
DESCRIPTION
The front seat belt buckle switch LH circuit consists of the airbag sensor assembly and front seat belt buckle switch LH (front seat inner belt assembly LH).
DTC B1656 is stored when a malfunction is detected in the front seat belt buckle switch LH circuit.
DTC No.
|
Detection Item
|
DTC Detection Condition
|
Trouble Area
|
Warning Indicate
|
Test Mode / Check Mode
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B1656
|
Seat Belt Buckle Switch (LH)
|
-
The airbag sensor assembly detects a line short, short to ground or B+, or an open in the front seat belt buckle switch LH circuit.
-
Front seat belt buckle switch LH malfunction
-
Airbag sensor assembly malfunction
|
-
Floor wire
-
Front seat belt buckle switch LH (Front seat inner belt assembly LH)
-
Airbag sensor assembly
|
Comes on
|
Does not apply to test/check mode
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.
Click here
PROCEDURE
1.
|
CHECK CONNECTION OF CONNECTORS
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(a) Turn the power switch off.
(b) Disconnect the cable from the negative (-) auxiliary battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary 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.
NG |
|
CONNECT CONNECTORS PROPERLY
|
OK
|
|
|
(a) Disconnect the connectors from the airbag sensor assembly and front seat inner belt assembly LH.
(b) Check that the terminals of the connectors are not deformed or damaged.
OK:
The terminals are not deformed or damaged.
NG |
|
REPLACE FLOOR WIRE OR FRONT SEAT INNER BELT ASSEMBLY LH
|
OK
|
|
|
(a) Connect the cable to the negative (-) auxiliary battery terminal.
|
|
*1
|
Front Seat Inner Belt Assembly LH
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*2
|
Airbag Sensor Assembly
|
*3
|
Floor Wire
|
*4
|
Service Wire
|
*a
|
Front view of wire harness connector
(to Airbag Sensor Assembly)
|
*b
|
Front view of wire harness connector
(to Front Seat Inner Belt Assembly LH)
|
|
|
(b) Turn the power switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
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O23-2 (LBE+) - Body ground
|
Power switch on (IG)
|
Below 1 V
|
O23-1 (LBE-) - Body ground
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Power switch on (IG)
|
Below 1 V
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(d) Turn the power switch off.
(e) Disconnect the cable from the negative (-) auxiliary battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.
(f) Using a service wire, connect terminals 28 (LBE+) and 27 (LBE-) of connector B.
NOTICE:
Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.
(g) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
O23-2 (LBE+) - O23-1 (LBE-)
|
Always
|
Below 1 Ω
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(h) Disconnect the service wire from connector B.
(i) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
O23-2 (LBE+) - O23-1 (LBE-)
|
Always
|
1 MΩ or higher
|
O23-2 (LBE+) - Body ground
|
Always
|
1 MΩ or higher
|
O23-1 (LBE-) - Body ground
|
Always
|
1 MΩ or higher
|
NG |
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REPLACE FLOOR WIRE
|
OK
|
|
|
(a) Connect the connectors to the airbag sensor assembly and front seat inner belt assembly LH.
|
|
*1
|
Front Seat Inner Belt Assembly LH
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*2
|
Airbag Sensor Assembly
|
|
|
(b) Connect the cable to the negative (-) auxiliary battery terminal.
(c) Turn the power switch on (IG), and wait for at least 60 seconds.
(d) Clear the DTCs stored in memory.
Body Electrical > SRS Airbag > Clear DTCs
(e) Turn the power switch off.
(f) Turn the power switch on (IG), and wait for at least 60 seconds.
(g) Check for DTCs.
Body Electrical > SRS Airbag > Trouble Codes
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.
NG
|
|
|
5.
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CHECK FRONT SEAT INNER BELT ASSEMBLY LH
|
(a) Turn the power switch off.
|
|
*1
|
Front Seat Inner Belt Assembly LH
|
*2
|
Airbag Sensor Assembly
|
|
|
(b) Disconnect the cable from the negative (-) auxiliary battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary 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 (-) auxiliary battery terminal.
(e) Turn the power switch on (IG), and wait for at least 60 seconds.
(f) Clear the DTCs stored in memory.
Body Electrical > SRS Airbag > Clear DTCs
(g) Turn the power switch off.
(h) Turn the power switch on (IG), and wait for at least 60 seconds.
(i) Check for DTCs.
Body Electrical > SRS Airbag > Trouble Codes
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.
(j) Turn the power switch off.
(k) Disconnect the cable from the negative (-) auxiliary battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.
(l) Restore the front seat inner belt assembly LH that was installed for testing to its original location.
Click here
|