B1992

Code

Other B — Body

Driver Side, Side mount Airbag Circuit Short to Vbatt

Brand: Other

Type: B — Body

Views: UK: 28 EN: 36 RU: 27

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Page language: EN

Causes

Damaged or pinched wiring harness contacting a fused battery feed or accessory hot circuit.
Corroded, melted or bridged airbag connector pins creating a direct path to battery positive.
Faulty airbag squib (inflator) with internal short to its power lead.
Incorrect or damaged aftermarket wiring tapped into an airbag circuit or constant 12V source.
Faulty SRS (airbag) control module or damaged module connector providing unintended battery feed.
Poor repair after collision (improperly routed or repaired wiring).

Symptoms

Airbag / SRS warning lamp illuminated on dash.
Possible disabled side‑airbag deployment for driver-side side‑mount.
Related SRS codes stored (multiple airbag circuit DTCs).
Intermittent faults or lamp that returns after clearing codes if short is intermittent.

What to check

Read SRS codes and freeze frame with a capable scan tool; note any additional SRS codes.
Visual inspection of driver seat, seat base, seatbelt pretensioner area, door sill, and connector locations for damaged insulation, melted plastic, corrosion or aftermarket splices.
Inspect connectors at the SRS control module, seat module (if equipped), and the side‑airbag connector; look for pushed‑out terminals or evidence of arcing.
Verify battery voltage and charging system are normal before diagnostics to avoid confusing voltage-related symptoms.
With ignition OFF and SRS system disabled per manufacturer procedure, measure resistance of the squib (airbag) after unplugging the connector to check for expected squib resistance or an abnormal short.
Check for continuity between the airbag power lead and vehicle battery positive (with battery disconnected) to confirm a short to Vbatt.

Signal parameters

Expected inflator (squib) resistance: typically low ohms (commonly ~0.5–5 ohms depending on manufacturer). Consult OEM spec for exact value.
Open circuit (infinite resistance) indicates connector break or cut wire; near-zero ohms to battery positive indicates short to Vbatt.
No battery voltage should be present on the squib power terminal with ignition OFF and battery disconnected (verify per OEM procedure).
SRS control module input should be stable battery voltage only where designed; compare with wiring diagram for which pins are constant hot versus switched.

Diagnostic algorithm

Warning: Always follow the vehicle manufacturer’s SRS disable and handling procedures (disconnect battery negative and wait the specified time or use diagnostic disable tool) before touching connectors or wiring.
Retrieve full SRS code list and freeze‑frame data with a scan tool. Note any other related B‑codes.
Perform a visual inspection along the driver side harness path (seat, floor, door jamb, seat belt area). Look for damaged insulation, crushed wiring, pinch points, corrosion, or aftermarket tap points.
Disable the SRS system per the vehicle procedure (remove battery power and wait). Disconnect the driver side side‑mount airbag connector.
With battery removed, measure resistance across the airbag squib terminals at the connector. Compare to OEM spec: a low but finite value within specification means squib likely OK; a very low resistance to battery positive indicates a short; infinite resistance indicates open circuit.
To locate a short to battery: with battery disconnected, check continuity between the airbag power conductor and the vehicle’s battery positive feed or known fused 12V source. If continuity exists, isolate by disconnecting intermediate connectors (seat module, junction blocks) and retesting to find the section with the short.
If resistance across the squib looks abnormal, swap/inspect the connector and pin terminal; if still abnormal when isolated from wiring harness, suspect a defective squib (replace with new OEM part only).
If the squib and harness measure normal, disconnect the SRS control module connector(s) and check for voltage or continuity at the module pins to determine if the module is sourcing unexpected voltage. If module internal short suspected, follow OEM module replacement and pairing procedures.
Repair or replace damaged wiring, connector(s), or inflator as required. Clear codes, reconnect SRS according to manufacturer instructions, and verify that the SRS lamp goes out and no related codes return.
After repairs, perform a full system check with scan tool and confirm proper operation; restore any replaced parts per torque/installation specs and perform any required SRS readiness tests.

Likely causes

Wiring/connector short on the driver side side‑mount airbag circuit to a constant 12V feed.
Defective squib/inflator with internal short.
Aftermarket accessory or improper repair feeding constant battery voltage into the circuit.
SRS control module internal fault or damaged module harness connector.

Fault status

⚠️ Status

Driver side side‑mount airbag circuit detected short to battery positive (Vbatt). SRS control module stored B1992 and illuminated airbag warning lamp.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2 hours