1. DTC B0073[12] 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. The SRS control unit measures the voltage of the rear left side pretensioner ignition current output circuit. If the SRS control unit detects a short to the power supply in the rear left side pretensioner circuit, the DTC is set.
2. Condition for setting DTC B0073[12]
Condition for running the DTC
- The ignition power supply is normal.
Condition for setting the DTC
- The SRS control unit detects that the voltage of the rear left side pretensioner ignition current output circuit is more than the specified value.
3. Action taken when DTC B0073[12] sets
- SRS airbag warning light illuminates.
- Even if the condition returns to normal, the warning light does not turn OFF until the DTC is cleared.
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.