AIRBAG SYSTEM, Diagnostic DTC:B1810/53, B1811/53, B1812/53, B1813/53

DTC Code	DTC Name
B1810/53	Short in Driver Side Squib 2nd Step Circuit
B1811/53	Open in Driver Side Squib 2nd Step Circuit
B1812/53	Short to GND in Driver Side Squib 2nd Step Circuit
B1813/53	Short to B+ in Driver Side Squib 2nd Step Circuit

DESCRIPTION

The driver side squib 2nd step circuit consists of the center airbag sensor, the spiral cable, and the steering pad.

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

These DTCs are stored when a malfunction is detected in the driver side squib 2nd step circuit.

DTC Code	DTC Detection Condition	Trouble Area
B1810/53	When one of the following conditions is met: The center airbag sensor receives a line short circuit signal 5 times in the driver side squib 2nd step circuit during the primary check. A driver side squib 2nd step malfunction. A spiral cable malfunction. A center airbag sensor malfunction.	Instrument panel wire Spiral cable Steering pad (Driver side squib 2nd step) Center airbag sensor assembly
B1811/53	When one of the following conditions is met: The center airbag sensor receives an open circuit signal in the driver side squib 2nd step circuit for 2 seconds. A driver side squib 2nd step malfunction. A spiral cable malfunction. A center airbag sensor malfunction.	Instrument panel wire Spiral cable Steering pad (Driver side squib 2nd step) Center airbag sensor assembly
B1812/53	When one of the following conditions is met: The center airbag sensor receives a short circuit to ground signal in the driver side 2nd step circuit for 0.5 seconds. A driver side squib 2nd step malfunction. A spiral cable malfunction. A center airbag sensor malfunction.	Instrument panel wire Spiral cable Steering pad (Driver side squib 2nd step) Center airbag sensor assembly
B1813/53	When one of the following conditions is met: The center airbag sensor receives a short circuit to B+ signal in the driver side squib 2nd step circuit for 0.5 seconds. A driver side squib 2nd step malfunction. A spiral cable malfunction. A center airbag sensor malfunction.	Instrument panel wire Spiral cable Steering pad (Driver side squib 2nd step) Center airbag sensor assembly

WIRING DIAGRAM


*a	Driver Side Squib 2nd Step
*b	Spiral Cable
*c	Center Airbag Sensor

CAUTION / NOTICE / HINT

Note

After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Click here.
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.
After replacing the center airbag sensor assembly, refer to initialization Click here.

Tech Tips

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

PROCEDURE

CHECK STEERING PAD (DRIVER SIDE SQUIB 2ND STEP)
1. Turn the ignition switch off.
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Disconnect the connectors from the steering pad.
4. Connect the white wire side of SST (resistance: 2.1 Ω) to connector E (black connector).
  
  CAUTION:
  
  Never connect the tester to the steering pad (driver side squib 2nd step) 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 ignition switch to ON, and wait for at least 60 seconds.
7. Clear the DTCs Click here.
8. Turn the ignition switch off.
9. Turn the ignition switch to ON, and wait for at least 60 seconds.
10. Check for DTCs Click here.
  
  OK
  
  DTC B1810, B1811, B1812 or B1813 is not output.
  
  Tech Tips
  
  Codes other than DTC B1810, B1811, B1812 and B1813 may be output at this time, but they are not related to this check.
OK
REPLACE STEERING PAD Click here

NG
CHECK CONNECTOR
1. Turn the ignition switch off.
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Disconnect SST from connector E.
4. Check that the spiral cable connectors (on the steering pad side) are not damaged.
  
  OK
  
  The lock button is not disengaged, and the claw of the lock is not deformed or damaged.
NG
REPLACE SPIRAL CABLE Click here

OK

OK
DTC B1810, B1811, B1812 or B1813 is not output.

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

CHECK DRIVER SIDE SQUIB 2ND STEP CIRCUIT

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
z38-1 - Body ground	Ignition switch ON	Below 1 V
z38-2 - 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
z38-1 - z38-2	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
z38-1 - z38-2	Always	1 MΩ or higher
z38-1 - Body ground	Always	1 MΩ or higher
z38-2 - Body ground	Always	1 MΩ or higher

CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - SPIRAL CABLE) Click here

CHECK CENTER AIRBAG SENSOR
1. Connect the connectors to the steering pad and the center airbag sensor.
2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
3. Turn the ignition switch to ON, and wait for at least 60 seconds.
4. Clear the DTCs Click here.
5. Turn the ignition switch off.
6. Turn the ignition switch to ON, and wait for at least 60 seconds.
7. Check for DTCs Click here.
  
  OK
  
  DTC B1810, B1811, B1812 or B1813 is not output.
  
  Tech Tips
  
  Codes other than DTC B1810, B1811, B1812 and B1813 may be output at this time, but they are not related to this check.
OK
USE SIMULATION METHOD TO CHECK Click here

NG
REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

OK
DTC B1810, B1811, B1812 or B1813 is not output.

CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - SPIRAL CABLE)

Restore the released activation prevention mechanism of connector B to its original condition.
Disconnect the instrument panel wire connector from the spiral cable.
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
E13-4 (D2+) - Body ground	Ignition switch ON	Below 1 V
E13-3 (D2-) - 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
E13-4 (D2+) - E13-3 (D2-)	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
E13-4 (D2+) - E13-3 (D2-)	Always	1 MΩ or higher
E13-4 (D2+) - Body ground	Always	1 MΩ or higher
E13-3 (D2-) - Body ground	Always	1 MΩ or higher

REPLACE SPIRAL CABLE Click here

REPLACE INSTRUMENT PANEL WIRE