DTC B0021-1A: Left Curtain Deployment Control 1 - Circuit resistance below threshold: Action

WARNING: Do not measure the resistance of a deployable device using any other method than that described below

NOTE:

A shorting bar inside the connector (deployable device side) intentionally creates a short circuit until the wiring harness connector is installed AND the connector plunger is engaged
Airbag resistance should be 1.70 ohms to 2.30 ohms between -40 deg C to +85 deg C

Using the manufacturer approved diagnostic system, check datalogger signal - Deployment Control 6 Resistance (0x5B09). If the resistance is too low, disconnect and reconnect the left side air curtain connector, ensuring that the connector plunger is correctly engaged. Clear the DTCs and retest
Refer to the appropriate system wiring diagrams and check the left side air curtain circuit for short circuit between power and ground. Clear the DTCs and retest. If the fault persists, install a new wiring harness as necessary
If no wiring harness fault exists, using the manufacturer approved diagnostic system, clear the DTCs and retest. If the fault persists, install a new deployable device