AIRBAG SYSTEM, Diagnostic DTC:B1835/58, B1836/58, B1837/58, B1838/58

DTC Code	DTC Name
B1835/58	Short in Front Passenger Side Curtain Shield Squib Circuit
B1836/58	Open in Front Passenger Side Curtain Shield Squib Circuit
B1837/58	Short to GND in Front Passenger Side Curtain Shield Squib Circuit
B1838/58	Short to B+ in Front Passenger Side Curtain Shield Squib Circuit

DESCRIPTION

The front passenger side curtain shield squib circuit consists of the center airbag sensor and the front passenger side curtain shield airbag.

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

These DTCs are recorded when a malfunction is detected in the front passenger side curtain shield squib circuit.

DTC Code	Detection Condition	Trouble Area
B1835/58	When all conditions below are met: The center airbag sensor receives a line short circuit signal 5 times in the front passenger side curtain shield squib circuit during primary check. Front passenger side curtain shield squib malfunction Center airbag sensor malfunction	Floor wire Curtain shield airbag assembly (front passenger side) Center airbag sensor assembly
B1836/58	When all conditions below are met: The center airbag sensor receives an open circuit signal in the front passenger side curtain shield squib circuit for 2 seconds. Front passenger side curtain shield squib malfunction Center airbag sensor malfunction	Floor wire Curtain shield airbag assembly (front passenger side) Center airbag sensor assembly
B1837/58	When all conditions below are met: The center airbag sensor receives a short circuit to ground signal in the front passenger side curtain shield squib circuit for 0.5 seconds. Front passenger side curtain shield squib malfunction Center airbag sensor malfunction	Floor wire Curtain shield airbag assembly (front passenger side) Center airbag sensor assembly
B1838/58	When all conditions below are met: The center airbag sensor receives a short circuit to B+ signal in the front passenger side curtain shield squib circuit for 0.5 seconds. Front passenger side curtain shield squib malfunction Center airbag sensor malfunction	Floor wire Curtain shield airbag assembly (front passenger side) Center airbag sensor assembly

WIRING DIAGRAM

INSPECTION PROCEDURE

Tech Tips

Perform the simulation method by selecting "check mode" (signal check) with the intelligent tester Click here.
After selecting "check mode" (signal check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on various types of roads Click here.

PROCEDURE

CHECK VEHICLE CONDITION

Check vehicle condition.

Result
Result	Proceed to
for LHD	A
for RHD	B

CHECK CURTAIN SHIELD AIRBAG ASSEMBLY LH (CURTAIN SHIELD SQUIB LH) Click here

CHECK CURTAIN SHIELD AIRBAG RH (CURTAIN SHIELD SQUIB RH)
1. Turn the ignition switch OFF.
2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3. Disconnect the connector from the curtain shield airbag RH.
4. Connect the white wire side of SST (resistance: 2.1 Ω) to connector C.
  
  CAUTION:
  
  Never connect the tester to the curtain shield airbag RH (curtain shield squib RH) 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 negative (-) terminal cable to the battery, and wait for at least 2 seconds.
6. Turn the ignition switch 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 ON, and wait for at least 60 seconds.
10. Check for DTCs Click here.
  
  OK
  
  DTC B1835, B1836, B1837 or B1838 is not output.
  
  Tech Tips
  
  Codes other than DTC B1835, B1836, B1837, B1838 may be output at this time, but they are not related to this check.
NG
CHECK CONNECTOR Click here

OK

REPLACE CURTAIN SHIELD AIRBAG ASSEMBLY RH
CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3. Disconnect SST from connector C.
4. Check that the floor wire connector (on the curtain shield airbag RH side) is not damaged.
  
  OK
  
  The lock button is not disengaged, or the claw of the lock is not deformed or damaged.
NG
REPLACE FLOOR WIRE

OK

OK
DTC B1835, B1836, B1837 or B1838 is not output.

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

CHECK FLOOR WIRE (CURTAIN SHIELD SQUIB RH CIRCUIT)

Disconnect the connectors from the center airbag sensor.
Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
Turn the ignition switch ON.

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

Standard voltage

Tester Connection	Switch Condition	Specified Condition
C21-2 (ICR-) - Body ground	Ignition switch ON	Below 1 V
C21-1 (ICR+) - Body ground	Ignition switch ON	Below 1 V

Turn the ignition switch OFF.
Disconnect the negative (-) terminal cable from the battery, 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
C21-2 (ICR-) - C21-1 (ICR+)	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
C21-2 (ICR-) - C21-1 (ICR+)	Always	1 MΩ or higher
C21-2 (ICR-) - Body ground
C21-1 (ICR+) - Body ground

REPLACE FLOOR WIRE

CHECK CENTER AIRBAG SENSOR ASSEMBLY
1. Connect the connectors to the curtain shield airbag RH and the center airbag sensor.
2. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
3. Turn the ignition switch 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 ON, and wait for at least 60 seconds.
7. Check for DTCs Click here.
  
  OK
  
  DTC B1835, B1836, B1837 or B1838 is not output
  
  Tech Tips
  
  Codes other than DTC B1835, B1836, B1837, B1838 may be output at this time, but they are not related to this check.
NG
REPLACE CENTER AIRBAG SENSOR ASSEMBLY

OK

USE SIMULATION METHOD TO CHECK
CHECK CURTAIN SHIELD AIRBAG ASSEMBLY LH (CURTAIN SHIELD SQUIB LH)
1. Turn the ignition switch OFF.
2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3. Disconnect the connector from the curtain shield airbag RH.
4. Connect the white wire side of SST (resistance: 2.1 Ω) to connector C.
  
  CAUTION:
  
  Never connect the tester to the curtain shield airbag RH (curtain shield squib RH) 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.
5. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
6. Turn the ignition switch 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 ON, and wait for at least 60 seconds.
10. Check for DTCs Click here.
  
  OK
  
  DTC B1835, B1836, B1837 or B1838 is not output.
  
  Tech Tips
  
  Codes other than DTC B1835, B1836, B1837, B1838 may be output at this time, but they are not related to this check.
NG
CHECK CONNECTOR Click here

OK

REPLACE CURTAIN SHIELD AIRBAG ASSEMBLY LH
CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3. Disconnect SST from connector C.
4. Check that the floor wire connector (on the curtain shield airbag LH side) is not damaged.
  
  OK
  
  The lock button is not disengaged, or the claw of the lock is not deformed or damaged.
NG
REPLACE FLOOR WIRE

OK

OK
DTC B1835, B1836, B1837 or B1838 is not output

OK
DTC B1835, B1836, B1837 or B1838 is not output.

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

CHECK FLOOR WIRE

Disconnect the connectors from the center airbag sensor.
Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
Turn the ignition switch ON.

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

Standard voltage

Tester Connection	Switch Condition	Specified Condition
C22-2 (ICL-) - Body ground	Ignition switch ON	Below 1 V
C22-1 (ICL+) - Body ground	Ignition switch ON	Below 1 V

Turn the ignition switch OFF.
Disconnect the negative (-) terminal cable from the battery, 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
C22-2 (ICL-) - C22-1 (ICL+)	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
C22-2 (ICL-) - C22-1 (ICL+)	Always	1 MΩ or higher
C22-2 (ICL-) - Body ground
C22-1 (ICL+) - Body ground

REPLACE FLOOR WIRE

CHECK CENTER AIRBAG SENSOR ASSEMBLY
1. Connect the connectors to the curtain shield airbag LH and the center airbag sensor.
2. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
3. Turn the ignition switch 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 ON, and wait for at least 60 seconds.
7. Check for DTCs Click here.
  
  OK
  
  DTC B1835, B1836, B1837 or B1838 is not output
  
  Tech Tips
  
  Codes other than DTC B1835, B1836, B1837, B1838 may be output at this time, but they are not related to this check.
NG
REPLACE CENTER AIRBAG SENSOR ASSEMBLY

OK

USE SIMULATION METHOD TO CHECK