B0039

Code

Generic B — Body

Second Row Right Frontal Stage 1 Deployment Control

Brand: Generic

Type: B — Body

Views: UK: 19 EN: 39 RU: 21

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or short in the right second-row frontal squib wiring
Poor, corroded or detached connector at the airbag module or SRS control module
Failed or damaged right second-row frontal airbag (squib)
Faulty SRS/airbag control module or internal driver circuitry
Recent deployment or improper repair (unresolved wiring damage or incorrect component replacement)
Water intrusion or physical damage to wiring or connector

Symptoms

SRS/Airbag warning lamp illuminated
Stored B0039 (and possibly related SRS codes) in vehicle memory
Partial or full disablement of second-row right frontal stage 1 deployment
Possible complement codes for open/short conditions in airbag circuit

What to check

Use a scan tool to read/record all stored SRS codes and freeze-frame data
Visually inspect the second-row right seat, seat track, B-pillar and connector for damage, corrosion or water intrusion
Check battery voltage and charging system (low voltage can cause SRS faults)
Follow manufacturer-safe procedure: disconnect battery and wait recommended time before touching SRS components
Inspect and verify connector pins are not pushed out, bent, or corroded
Perform continuity/resistance check of the squib circuit with connectors disconnected (see signal_params)

Signal parameters

Typical squib (airbag) circuit low resistance when intact: ~0.5–5 Ω (vehicle-specific — consult OE data)
Open-circuit reading: infinite/OL (indicates broken wiring or disconnected squib)
Short-to-ground reading: ~0 Ω (indicates short to chassis ground)
Short-to-battery reading or presence of battery voltage on squib line with ignition on indicates short to power (should not usually be present)
No deployment voltage should be measured at squib connector with ignition on; deployment is a high-current event commanded by the module only

Diagnostic algorithm

Safety first: disable the SRS system per manufacturer instructions (battery negative disconnect and wait specified time) before inspecting connectors or wiring
Connect an OEM-capable scan tool. Read and record all SRS codes, freeze frame and live data. Note any related codes.
Verify battery voltage is within normal range. Low/unstable voltage can create spurious SRS faults.
Visually inspect the second-row right seat assembly, connectors, wiring harness along seat tracks and B-pillar for damage, corrosion, signs of water ingress or previous repairs.
With ignition off and battery disabled, disconnect the squib connector(s) and inspect pins for corrosion, damage or pushed-out terminals. Repair connector as needed.
Measure squib resistance at the disconnected airbag connector: compare to OE specification or expected low-resistance range (~0.5–5 Ω). An open or very high reading indicates a broken squib or open wiring; a near-zero reading indicates a short.
Check continuity between the squib connector and the SRS control module pin for open/short conditions. Inspect grounds and chassis connections.
Reconnect and, following safe procedures, perform a wiggle test of the wiring while monitoring live resistance/data to identify intermittent faults.
If wiring and connectors pass, test or replace the second-row right frontal airbag module (squib) per manufacturer procedure. If squib replacement performed, clear codes and re-test.
If squib and harness are good, suspect SRS control module fault — verify with OEM diagnostic tests, perform module programming/initialization if required, or replace module per OE instructions.
After repair, clear codes, perform SRS system self-test and verify no DTCs return. Document repair and any replaced SRS components.

Likely causes

Corroded/damaged connector at the seat or module
Broken/shorted wiring harness in seat or B-pillar area from movement
Failed squib inside the second-row right frontal airbag
Faulty SRS control module output stage for that channel

Fault status

⚠️ Status

SRS control module reports fault in second-row right frontal Stage 1 deployment control circuit. Deployment for that stage may be disabled until the fault is resolved.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours