B255800 — Passenger Airbag on/off warning lamp Short or Short to Battery

Diagnostic algorithm

1. Safety first: disable battery negative terminal and follow manufacturer SRS disabling interval (typically wait at least 10 minutes or specified time) before working on SRS, airbag modules or clockspring areas.
2. Scan SRS control module, record codes and any supporting PIDs. Clear the code and see if it returns to confirm persistence.
3. Visually inspect wiring and connectors for the passenger airbag ON/OFF lamp circuit — instrument cluster, dash harness, passenger seat/OPDS area, and SRS control module connector.
4. With ignition ON and using a multimeter, check for battery voltage at the lamp power feed and at the lamp control pin. If battery voltage is present where it should not be, suspect a short to battery.
5. Disconnect the instrument cluster or indicator assembly connector and re-check for the short. If the short disappears, the cluster/indicator is likely faulty; if not, continue tracing wiring toward the SRS control module.
6. Perform continuity and resistance checks from the indicator connector back to the SRS control module and to ground. Repair any opens or high resistance connections; repair/replace damaged wiring and connectors.
7. Inspect for aftermarket accessories or improper splices that may inject battery voltage into the lamp circuit and remove/repair as needed.
8. If wiring and connectors test good, consider replacing the indicator assembly (instrument cluster) or, as a last step, the SRS control module — only after confirming module replacement procedures and reinitialization per manufacturer.
9. After repairs, clear codes, reconnect battery, and perform SRS system self-test. Verify normal lamp behavior and confirm code does not return.
10. If uncertain, consult factory wiring diagrams and service manual for pinouts, harness routing and recommended test values; escalate to dealer-level SRS diagnostic if necessary.