B004A

Code

Generic B — Body

Third Row Right Frontal Stage 2 Deployment Control

Brand: Generic

Type: B — Body

Views: UK: 14 EN: 27 RU: 22

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Page language: EN

Causes

Open or short in the Stage 2 squib/deployment wiring (open, short-to-ground, short-to-power)
Corroded, damaged, or disconnected connector at the right third-row frontal airbag or intermediate junction
Faulty Stage 2 squib/inflator assembly (internal short, changed resistance, prior damage)
Faulty airbag (SRS) control module or a failed driver transistor/output for that stage
Previous deployment or incomplete repair after a crash (unreplaced squib or damaged harness)
Intermittent wiring fault due to chafing, pinched harness, or poor body/chassis ground

Symptoms

SRS / Airbag warning lamp illuminated on dash
Possible associated stored SRS codes for other airbag circuits or module
Occupant detection or seatbelt pre-tensioner warnings (if integrated)
No deploy indicator until verified — vehicle may be in a reduced SRS state

What to check

Read SRS airbag module with a capable scan tool; record freeze frame and any related codes or crash data
Inspect right third-row frontal airbag connector and wiring for corrosion, damage, or disconnection
Visually inspect harness routing for chafing, pinching, or recent body repairs that could have damaged wiring
Check related ground points and power supplies to the SRS module
Measure squib/inflator resistance with SRS system disabled per manufacturer procedure
Verify continuity and check for short-to-power or short-to-ground on the Stage 2 firing circuit

Signal parameters

Squib resistance: typically low ohms (manufacturer-specific). Open circuit = OL/infinite; short ~0 Ω
Acreasing/high resistance indicates poor connection or corrosion; exact pass/fail values are manufacturer-specific
Control module firing output: pulse/voltage waveform present only during commanded deployment (do not attempt to trigger deployment)
Supply voltage to SRS module: nominal battery voltage (check for stable supply and good ground reference)

Diagnostic algorithm

SAFETY FIRST: Follow the vehicle manufacturer's SRS safety procedures. Disable the SRS system and disconnect the battery as directed. Allow specified capacitor discharge time before touching SRS components.
Connect a scan tool and read all stored SRS codes and freeze-frame/crash data. Note any related codes that may point to harness or module faults.
Visually inspect the right third-row frontal airbag, connectors, and intermediate wiring for damage, corrosion, or loose pins. Repair any obvious physical damage.
With SRS disabled per the procedure, measure resistance of the Stage 2 squib circuit at the airbag connector and at the module connector. Compare to manufacturer specifications. Look for open circuit (OL) or near-zero short.
Check continuity of the wiring between the airbag connector and the SRS module. Check for short-to-ground and short-to-power on the Stage 2 circuit while disconnected from the module.
Inspect and test module power and ground circuits; poor ground or low supply voltage can cause erroneous fault detection.

Likely causes

Damaged connector or wiring harness at the third-row right frontal airbag
Stage 2 squib/inflator resistance out of specification (open or short)
Control module driver output failed for Stage 2 circuit
Corrosion at pin terminals causing high resistance or intermittent connection

Fault status

⚠️ Status

B004A — Third Row Right Frontal Stage 2 Deployment Control: SRS module detected a fault in the Stage 2 deployment circuit for the right third-row frontal airbag (possible wiring, connector, squib/inflator, or module driver issue).

🔴 Repair difficulty: Hard

⏱️ Diagnostic time: 1.0-3.0 hours