Code
B0061
HUMMER
B — Body
Roof Rail Module-Left Deployment Loop Circuit
AI status
Completed
Completed
100%
Causes
- Open circuit in left roof rail (curtain) airbag squib/harness
- Short to ground or to battery voltage in the deployment loop
- Corroded, loose or damaged connector at roof rail module or airbag squib
- Water intrusion or physical damage to headliner/harness routing
- Poor module ground or power feed to the roof rail module
- Failed roof rail (airbag) module or internal squib fault
Symptoms
- SRS/Airbag warning lamp illuminated on dash
- DTC B0061 stored in SRS/roof rail module memory and may prevent related airbag from arming
- Possible additional SRS-related DTCs or loss of communication with roof rail module
- Intermittent illumination of the SRS lamp (if wiring intermittent)
- Vehicle may fail SRS self-check and inhibit curtain airbag deployment until repaired
What to check
- Read and record all SRS codes and freeze-frame data with a capable scan tool; note related codes
- Confirm vehicle-specific safety procedure and disable vehicle battery (follow manufacturer recommended wait time) before touching SRS components
- Visually inspect left roof rail/headliner area, connectors, and harness routing for damage, corrosion or signs of water intrusion
- Inspect connector pins at roof rail module and each squib connector for bent pins, corrosion or pushed-back terminals
- With battery disconnected, check continuity and resistance of the left deployment loop at accessible connector(s) using factory pinouts
- Perform wiggle/force tests while monitoring live SRS data (only with proper precautions and following factory steps) to try to reproduce the fault
Signal parameters
- Normal squib/deployment loop resistance: low single-digit ohms (system-specific). Refer to factory specification; typical range often ~0.5–5 Ω for squib circuits — consult OEM data
- Open-circuit: infinite resistance/‘OL’ between squib pins or between squib and return
- Short-to-ground or short-to-Vb: near 0 Ω between squib conductor and ground or battery positive respectively
- Module-side monitoring voltage: module detects abnormal high/low resistance or short/open conditions and sets the DTC — verify using OEM live-data values
Diagnostic algorithm
- Read and record SRS codes and related freeze-frame data with an OEM-capable scan tool. Note any other SRS/B‑codes.
- Follow manufacturer SRS safety procedure: disable battery ground cable and wait the specified time before accessing airbag components.
- Perform a careful visual inspection of left roof rail/headliner harness, connectors and curtain airbag inflator plug for damage, corrosion, disconnected terminals, or water entry.
- Using manufacturer wiring diagrams, identify the left roof rail deployment loop pins at the roof rail module and at the airbag connector.
- With battery disconnected, measure resistance of the left deployment loop across the squib pins. Compare to OEM spec. An open (infinite) or very high reading indicates an open; a very low reading to ground indicates a short.
- If open or high resistance is present, perform continuity checks pin-to-pin along the harness to find the break. Inspect and repair any damaged sections, connectors or terminals.
- If short to ground/voltage suspected, isolate sections of the circuit by disconnecting connectors and measure for short to chassis ground or battery voltage to locate the shorted segment.
- Inspect and clean corroded connectors; repair/replace damaged terminals and connectors as required. Use proper crimping/terminals and insulate repairs to meet SRS standards.
- If harness and connectors check good, verify module power, ground and communication lines with scan tool. If those are correct and loop resistance is within spec, suspect module internal fault and consult OEM guidance for module replacement.
- After repair, reconnect battery (following OEM reconnection procedure), clear codes, and perform SRS system self-test or OEM post-repair verification. Confirm code does not return and SRS lamp is extinguished.
- If the vehicle had a prior deployment, verify crash-data/repairs performed correctly; replace any inflators or modules per OEM crash-repair rules.
Likely causes
- Damaged/abraded wiring in headliner or A-pillar harness to left roof rail
- Corroded/poor connector at roof rail module or airbag inflator plug
- Open circuit due to connector disengagement or broken wire
- Short to ground caused by chafing against metal or water ingress causing corrosion
- Less likely: internal module failure after harness ruled out
Fault status
Status
Stored DTC B0061 — Left roof rail (curtain) deployment loop circuit fault detected. SRS/airbag warning lamp illuminated. Related curtain airbag may be disabled until fault is repaired.
Repair difficulty: Hard
Diagnostic time: 2.0-4.0 hours
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