1. Check resistance between the No. 19 and No. 20 terminals of SRS unit connector B (28P). There should be an open circuit or at least 1 MΩ.

Is the resistance as specified?

YES | - | Faulty left side impact sensor (first) or SRS unit; replace the left side impact sensor (first). If the problem is still present, replace the SRS unit. ■
NO | - | Short in the floor wire harness; replace the floor wire harness.■