AIRBAG SYSTEM(w/o Occupant Classification System), Diagnostic DTC:B1825/56,B1826/56,B1827/56 and B1828/56

DTC Code	DTC Name
B1825/56	Short in Side Squib LH Circuit
B1826/56	Open in Side Squib LH Circuit
B1827/56	Short to GND in Side Squib LH Circuit
B1828/56	Short to B+ in Side Squib LH Circuit

DESCRIPTION

The front side squib LH circuit consists of the airbag sensor assembly and front seat airbag assembly LH.

The circuit instructs the SRS to deploy when deployment conditions are met.

These DTCs are stored when a malfunction is detected in the front side squib LH circuit.


DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B1825/56	Short in Side Squib LH Circuit	One of the following conditions is met: The airbag sensor assembly detects a line short circuit signal 5 times in the front side squib LH circuit during the primary check. A front side squib LH malfunction. A airbag sensor assembly malfunction.	No. 2 floor wire Front seat airbag assembly LH (Front side squib LH) Airbag sensor assembly
B1826/56	Open in Side Squib LH Circuit	One of the following conditions is met: The airbag sensor assembly detects an open circuit signal in the front side squib LH circuit for 2 seconds. A front side squib LH malfunction. A airbag sensor assembly malfunction.	No. 2 floor wire Front seat airbag assembly LH (Front side squib LH) Airbag sensor assembly
B1827/56	Short to GND in Side Squib LH Circuit	One of the following conditions is met: The airbag sensor assembly detects a short circuit to ground signal in the front side squib LH circuit for 0.5 seconds. A front side squib LH malfunction. A airbag sensor assembly malfunction.	No. 2 floor wire Front seat airbag assembly LH (Front side squib LH) Airbag sensor assembly
B1828/56	Short to B+ in Side Squib LH Circuit	One of the following conditions is met: The airbag sensor assembly detects a short circuit to B+ signal in the front side squib LH circuit for 0.5 seconds. A front side squib LH malfunction. A airbag sensor assembly malfunction.	No. 2 floor wire Front seat airbag assembly LH (Front side squib LH) Airbag sensor assembly

WIRING DIAGRAM

CAUTION / NOTICE / HINT

Note:

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 Click here Click here Click here Click here
When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.
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When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.
Click here Click here Click here Click here Click here Click here

Tip:

To perform the simulation method, enter check mode (signal check) with the GTS (Click here), and then wiggle each connector of the airbag system or drive the vehicle on various types of road (Click here).

PROCEDURE

CHECK FRONT SEAT AIRBAG ASSEMBLY LH (FRONT SIDE SQUIB LH)

*1	Front Side Squib LH
*2	Airbag Sensor Assembly
*3	Connector C
*a	Front view of wire harness connector (to Front Side Squib LH)
*b	Color: Red

Turn the ignition switch off.

Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
Disconnect the connectors from the front seat airbag assembly LH.
Connect the red wire side of SST (resistance: 2.1 Ω) to connector C.

CAUTION:
Never connect the tester to the front seat airbag assembly LH (front side squib LH) for measurement, as this may lead to a serious injury due to airbag deployment.
Note:
- Do not forcibly insert SST into the terminals of the connector when connecting SST.
- Insert SST straight into the terminals of the connector.
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

Body Electrical > SRS Airbag > Clear DTCs
Turn the ignition switch off.
Turn the ignition switch to ON, and wait for at least 60 seconds.
Check for DTCs.
Click here

Body Electrical > SRS Airbag > Trouble Codes

OK

DTC B1800/51, B1801/51, B1802/51 or B1803/51 is not output.

Tip:
Codes other than DTC B1800/51, B1801/51, B1802/51 and B1803/51 may be output at this time, but they are not related to this check.
Turn the ignition switch off.
Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
Disconnect SST from connector C.

09843-18061

Result


Proceed to
OK (for Power Seat)
OK (for Manual Seat)
NG

OK (for Power Seat)

REPLACE FRONT SEAT AIRBAG ASSEMBLY LH

Click here

OK (for Manual Seat)

REPLACE FRONT SEAT AIRBAG ASSEMBLY LH

Click here

CHECK CONNECTOR

Disconnect the connectors from the airbag sensor assembly.

*1	Front Side Squib LH
*2	No. 2 Floor Wire
*3	Airbag Sensor Assembly

Check that the connectors (on the airbag sensor assembly side and front seat airbag assembly LH side) are not damaged.

The lock button is not disengaged, and the claw of the lock is not deformed or damaged.

Result


Proceed to
OK
NG

REPLACE HARNESS AND CONNECTOR

CHECK FRONT SIDE SQUIB LH CIRCUIT

*1	Front Side Squib LH
*2	No. 2 Floor Wire
*3	Airbag Sensor Assembly
*4	Connector C
*a	Front view of wire harness connector (to Front Side Squib 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
Nr1-1 (SFL+) - Body ground	Ignition switch ON	Below 1 V
Nr1-2 (SFL-) - Body ground	Ignition switch ON	Below 1 V

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

Measure the resistance according to the value(s) in the table below.

Standard Resistance


Tester Connection	Condition	Specified Condition
Nr1-1 (SFL+) - Nr1-2 (SFL-)	Always	Below 1 Ω

Release the activation prevention mechanism built into connector B.
Click here

Measure the resistance according to the value(s) in the table below.

Standard Resistance


Tester Connection	Condition	Specified Condition
Nr1-1 (SFL+) - Nr1-2 (SFL-)	Always	1 MΩ or higher

Restore the released activation prevention mechanism of connector B to its original condition.

Measure the resistance according to the value(s) in the table below.

Standard Resistance


Tester Connection	Condition	Specified Condition
Nr1-1 (SFL+) - Body ground	Always	1 MΩ or higher
Nr1-2 (SFL-) - Body ground	Always	1 MΩ or higher

Result


Proceed to
OK
NG

REPLACE NO. 2 FLOOR WIRE

CHECK AIR BAG SENSOR ASSEMBLY

*1	Front Side Squib LH
*2	Airbag Sensor Assembly

Connect the connectors to the front seat airbag assembly LH and airbag sensor assembly.

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

Body Electrical > SRS Airbag > Trouble Codes
Turn the ignition switch off.
Turn the ignition switch to ON, and wait for at least 60 seconds.
Check for DTCs.
Click here

Body Electrical > SRS Airbag > Clear DTCs

OK

DTC B1825/56, B1826/56, B1827/56 or B1828/56 is not output

Tip:
Codes other than DTC B1825/56, B1826/56, B1827/56 and B1828/56 may be output at this time, but they are not related to this check.

Result


Proceed to
DTC B1825/56, B1826/56, B1827/56 or B1828/56 is not output
DTC B1825/56, B1826/56, B1827/56 or B1828/56 is output

DTC B1825/56, B1826/56, B1827/56 or B1828/56 is not output

USE SIMULATION METHOD TO CHECK

Click here

DTC B1825/56, B1826/56, B1827/56 or B1828/56 is output

REPLACE AIR BAG SENSOR ASSEMBLY

Click here