Measure resistance between the connector (3R) in the test harness R and chassis ground.
Connector & terminal
(3R) No. 2 — (3R) No. 4:
(3R) No. 2 — Chassis ground:
(3R) No. 4 — Chassis ground:
Is the resistance 1 MΩ or more?
Replace the side airbag harness along with the body harness.