DTC B0021-1A Overview
If a voltage on the detection line inside the SRS unit is lower than a specified value, the SRS unit determines an abnormality and stores the DTC.
Special Tools Required
SRS Short Canceller 070AZ-SAA0100
Inspection Outline
The components to be tested are indicated by a dotted line.
Inspection Items
- Left Side Curtain Airbag Inspection
- External Circuit LCA+, LCA- Shorted Wire Inspection
- SRS Unit Inspection
NOTICE:
Before disconnecting the SRS related connector, do the 12 volt battery terminal disconnection procedure and wait for at least 3 minutes.
NOTE:
Since there is no direct method to test the component itself, troubleshooting is performed on the related components.
1. Left Side Curtain Airbag Inspection
- Test Procedure
Left side curtain airbag circuit inspection
- Preparation
Left side curtain airbag inflator 2P connector: disconnected
- Procedure
Perform the confirmation procedure.
- Normal Conditions
DTC B0021-1A is not indicated.
■ Results
- If it is normal, there is a problem with the left side curtain airbag.
- If it is abnormal, there is a problem with other related components.
2. External Circuit LCA+, LCA- Shorted Wire Inspection
Test Procedure
- Preparation
- SRS unit connector B (57P): disconnected
- Left side curtain airbag inflator 2P connector: disconnected
- SRS unit connector B (57P) No. 25 and No. 26: connected to SRS short canceller
- Procedure
Perform the inspection according to the following table.
■ Results
If abnormal, there is a problem in the circuit.
3. SRS Unit Inspection
- Test Procedure
If the other inspection item(s) indicated a normal condition, then it is determined that the remaining SRS unit is the cause.
- Results
There is a problem with the SRS unit.
Confirmation Procedure
Turn the vehicle to the ON mode, then wait for 10 seconds.
Tags:
DTC