How a Battery Functions

DTC B0021-11 Overview

If a current (or voltage) on the detection line inside the SRS unit is higher than a specified value, the SRS unit determines an abnormality and stores the DTC.

Inspection Outline

The components to be tested are indicated by a dotted line.

Inspection Items

1. Left Side Curtain Airbag Inspection
2. External Circuit LCA+, LCA- Shorted Wire Inspection
3. 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 B0021-11 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. LCA+, LCA- Shorted Wire Inspection

• Test Procedure

Preparation

• SRS unit connector B (57P): disconnected
• Left side curtain airbag inflator 2P connector: disconnected
• 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. Read DTC B0020

Confirmation Procedure

Turn the vehicle to the ON mode, then wait for 10 seconds.