1. DTC B0028[1B] DTC description
When the ignition switch is turned ON, the SRS control unit performs diagnosis to determine whether serious malfunctions have occurred within the control unit. If the internal function is determined to be normal, the ignition voltage and the deployment circuit voltage are measured in order to verify that they are within the normal range. After that, the SRS control unit conducts a resistance measurement. By running a light current of a known amount between the driver side airbag deployment current output (High) circuit and the driver side airbag deployment current output (Low) circuit, the voltage difference between the terminals is measured. The SRS control unit calculates the composite resistance of the driver side airbag circuit, driver side airbag, and connector terminal contact point.
2. Condition for setting DTC B0028[1B]
- The SRS control unit detects that the composite resistance of the driver side airbag, driver side airbag deployment current output (High) circuit, driver side airbag deployment current output (Low) circuit, and connector terminal contact point is more than the specified value.
3. Action taken when DTC B0028[1B] sets
- SRS airbag warning light illuminates.
Warning
- During the maintenance work, do not hit or shake the SRS control unit when handling it.
- If the SRS control unit is not properly installed, the SRS control unit may cause malfunctions. This may result in deployment of the SRS airbag and personal injury.
Caution
- To prevent the SRS parts to be replaced from malfunctioning and generating a battery short circuit, make sure to disconnect the battery cable before replacing the parts.