B0025

Code

Generic B — Body

Passenger Airbag Circuit Fault

Brand: Generic

Type: B — Body

Views: UK: 22 EN: 47 RU: 21

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open circuit in passenger airbag squib wiring
Short to ground or battery in the passenger airbag circuit
Poor or corroded connector under/around the passenger seat or dash
Faulty passenger airbag module (squib)
Faulty Occupant Classification System (OCS) or passenger presence sensor (if equipped)
Faulty airbag/RCM/SRS control module or internal driver fault

Symptoms

SRS / airbag warning lamp illuminated on instrument panel
Passenger airbag status (ON/OFF) message may be incorrect or overridden
Possible occupant classification system warnings or incorrect passenger presence detection
No airbag deployment testable — system may disable passenger airbag until repaired

What to check

Read codes and freeze frame data with an SRS-capable scan tool; record all related DTCs and live data
Visually inspect passenger seat area, under-seat connectors, and wiring harness routing for damage, corrosion or disconnected plugs
Check SRS fuses and any airbag-related relays (replace only with specified parts)
Verify battery voltage is good and charging system stable before diagnosis
Follow vehicle-specific safety procedures: disable battery negative and wait manufacturer-specified time before probing airbag connectors

Signal parameters

Squib resistance (passenger airbag) — typically low resistance (vehicle-specific, commonly ~0.5–5 Ω). Compare to manufacturer spec
Supply voltage to airbag circuit with ignition ON — approximately battery voltage (~11–14 V) at the fused supply feed (not at squib if driver module disconnected)
Open circuit: infinite resistance or very high ohms between squib terminals
Short to ground: very low resistance between squib wire and ground

Diagnostic algorithm

Safety first: disable battery negative terminal and wait the manufacturer-specified time (commonly 90 seconds or more) before accessing airbag components
Use an SRS-capable scan tool to confirm B0025 and note any related codes; clear codes only after repairs
Visually inspect the passenger airbag connector(s), wiring harness along the seat track, under-seat modules (OCS), and grounding points for damage, corrosion, loose pins or pushed-out retainer clips
Re-enable battery per safe procedure only if required for voltage checks; with caution measure supply voltage at the passenger airbag connector (consult service manual)
With battery disabled and using an ohmmeter, measure resistance across the passenger airbag squib terminals and compare to spec. An open circuit or radically out-of-spec resistance indicates a bad squib or wiring
Check continuity from the airbag connector to the SRS control module; check for shorts to ground or battery using insulation resistance checks or by probing back to the module (follow vehicle-specific test procedures)
If resistance is correct and wiring checks OK, inspect and test the Occupant Classification System (OCS) or passenger presence sensors and their harness (if vehicle equipped)
Repair or replace damaged wiring, connectors, or the passenger airbag module as required. Use manufacturer-approved parts and follow torque and connector locking procedures
After repairs, clear DTCs with a scan tool and verify SRS lamp extinguishes; confirm no related DTCs return and perform required post-repair SRS self-tests or initialization procedures (OCS calibrations, if required)

Likely causes

Damaged connector or wiring under the passenger seat (common from seat movement)
Open or high-resistance airbag squib (wiring break or connector corrosion)
Short to ground in squib wiring due to chafing or pinched harness
Faulty passenger airbag module/squib

Fault status

⚠️ Status

SRS control module has detected a fault in the passenger airbag circuit. The restraint system warning lamp is illuminated and the passenger airbag may be disabled until the issue is repaired.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours