AIRBAG SYSTEM, Diagnostic DTC:B1825/56, B1826/56, B1827/56, 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 side squib LH circuit consists of the center airbag sensor and the front seat airbag LH.

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

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

DTC Code	DTC Detection Condition	Trouble Area
B1825/56	When one of the following conditions is met: The center airbag sensor receives a line short circuit signal 5 times in the side squib LH circuit during the primary check. A side squib LH malfunction. A center airbag sensor malfunction.	Floor wire Front seat airbag assembly LH (Side squib LH) Center airbag sensor assembly
B1826/56	When one of the following conditions is met: The center airbag sensor receives an open circuit signal in the side squib LH circuit for 2 seconds. A side squib LH malfunction. A center airbag sensor malfunction.	Floor wire Front seat airbag assembly LH (Side squib LH) Center airbag sensor assembly
B1827/56	When one of the following conditions is met: The center airbag sensor receives a short circuit to ground signal in the side squib LH circuit for 0.5 seconds. A side squib LH malfunction. A center airbag sensor malfunction.	Floor wire Front seat airbag assembly LH (Side squib LH) Center airbag sensor assembly
B1828/56	When one of the following conditions is met: The center airbag sensor receives a short circuit to B+ signal in the side squib LH circuit for 0.5 seconds. A side squib LH malfunction. A center airbag sensor malfunction.	Floor wire Front seat airbag assembly LH (Side squib LH) Center airbag sensor assembly

WIRING DIAGRAM

INSPECTION PROCEDURE

Note

After turning the engine 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.
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.

Tech Tips

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

PROCEDURE

CHECK FRONT SEAT AIRBAG LH (SIDE SQUIB LH)
1. Turn the engine switch off.
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Disconnect the connector from the front seat airbag LH.
4. Connect the red wire side of SST (resistance: 2.1 Ω) to connector C.
  
  CAUTION:
  
  Never connect the tester to the front seat airbag LH (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.
  SST
  
  09843-18061
5. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
6. Turn the engine switch on (IG), and wait for at least 60 seconds.
7. Clear the DTCs Click here.
8. Turn the engine switch off.
9. Turn the engine switch on (IG), and wait for at least 60 seconds.
10. Check for DTCs Click here.
  
  OK
  
  DTC B1825, B1826, B1827 or B1828 is not output.
  
  Tech Tips
  
  Codes other than DTC B1825, B1826, B1827 and B1828 may be output at this time, but they are not related to this check.
NG
CHECK FLOOR WIRE (SIDE SQUIB LH CIRCUIT) Click here

OK

REPLACE FRONT SEAT AIRBAG ASSEMBLY LH Click here

OK
DTC B1825, B1826, B1827 or B1828 is not output.

CHECK FLOOR WIRE (SIDE SQUIB LH CIRCUIT)

Turn the engine switch off.
Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
Disconnect SST from connector C.
Disconnect the connectors from the center airbag sensor.
Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

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

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
K5-1 (SFL+) - Body ground	Engine switch on (IG)	Below 1 V
K5-2 (SFL-) - Body ground	Engine switch on (IG)	Below 1 V

Turn the engine 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
K5-1 (SFL+) - K5-2 (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
K5-1 (SFL+) - K5-2 (SFL-)	Always	1 MΩ or higher
K5-1 (SFL+) - Body ground	Always	1 MΩ or higher
K5-2 (SFL-) - Body ground	Always	1 MΩ or higher

REPLACE FLOOR WIRE

CHECK CENTER AIRBAG SENSOR
1. Connect the connectors to the front seat airbag LH and the center airbag sensor.
2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
3. Turn the engine switch on (IG), and wait for at least 60 seconds.
4. Clear the DTCs Click here.
5. Turn the engine switch off.
6. Turn the engine switch on (IG), and wait for at least 60 seconds.
7. Check for DTCs Click here.
  
  OK
  
  DTC B1825, B1826, B1827 or B1828 is not output.
  
  Tech Tips
  
  Codes other than DTC B1825, B1826, B1827 and B1828 may be output at this time, but they are not related to this check.
NG
REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

OK

USE SIMULATION METHOD TO CHECK Click here