Measure resistance between connector (2R) terminals in the test harness R.
Connector & terminal
(2R) No. 2 — (2R) No. 4:
(2R) No. 4 — Chassis ground:
(2R) No. 2 — Chassis ground:
Is the resistance 1 MΩ or more?
Replace the airbag main harness along with body harness.