| DTC Data Sheet | |
| System | Body |
| Standard | ISO/SAE Controlled |
| Fault type | Circuit/Open |
| Official meaning | Right curtain deployment control 1 circuit open |
B0029 means the airbag system has detected a problem in the right curtain airbag deployment control circuit, and it can disable part of the side-impact protection. You will usually see an SRS/Airbag warning light, and the system may store a hard fault that will not clear. According to factory diagnostic data, this code indicates an open circuit in the “Right curtain deployment control 1” circuit. The fault type matches SAE J2012DA FTB -13, which specifically points to an open circuit condition. Treat this as a safety-critical wiring and connection problem until testing proves otherwise.
Look up your vehicle's recalls, specs & safety ratings — free VIN decoder with NHTSA data
B0029 Quick Answer
B0029 points to an open circuit in the right curtain airbag deployment control 1 circuit. Depower and disable the SRS per OEM procedure first, then verify the harness and connectors for the right curtain squib loop before considering any component replacement.
What Does B0029 Mean?
The official B0029 meaning is “Right curtain deployment control 1 circuit open.” In plain terms, the SRS module (airbag control module) cannot “see” the electrical path it expects for the right curtain airbag deployment circuit. When that happens, the module turns the airbag warning light on and may inhibit that deployment channel to prevent an unsafe firing command.
Technically, the module monitors the deployment loop integrity for that curtain circuit using internal diagnostics. With FTB -13 (SAE J2012DA), the module has identified an open-circuit condition, not a short-to-ground or short-to-battery. An open can come from a disconnected connector, high resistance from corrosion, a damaged harness in the roof/door area, or a poor terminal fit. You must confirm the circuit fault with OEM-approved SRS test methods before condemning a curtain airbag or the SRS module.
Theory of Operation
In normal operation, the SRS module continuously checks each airbag deployment channel for circuit integrity. The right curtain “deployment control 1” circuit uses a dedicated two-wire loop from the module to the curtain inflator (squib) through intermediate connectors. The module expects a stable, valid circuit state at all times during key-on self-tests and while driving.
B0029 sets when that integrity check fails in a way consistent with an open circuit. A loose connector at the curtain inflator, a partially backed-out terminal, or damage near the A/B/C-pillar can break continuity. Some vehicles route the curtain harness through headliners and along roof rails, so trim work and water intrusion often create this exact failure mode. Always disable the SRS and follow OEM connector handling rules before touching any yellow SRS connector.
Symptoms
B0029 symptoms usually involve SRS warnings and stored safety faults rather than drivability issues.
- SRS/Airbag warning light illuminated on the dash shortly after key-on
- Stored B0029 code in the SRS module memory, often returning immediately after a clear attempt
- Right curtain airbag disabled or the affected deployment channel inhibited due to a detected open circuit
- Scan tool SRS data showing a “circuit open” or “high resistance” style status for the right curtain stage/control
- Intermittent warning after body work such as headliner, roof rail, door seal, or pillar trim repairs
- Warning after water leak into the A-pillar/roof rail area causing connector corrosion
- Other related SRS codes for adjacent side-impact components if the same harness section feeds multiple circuits
Common Causes
- Open in the right curtain deployment control circuit (harness break): A broken conductor prevents the SDM/RCM from seeing the expected circuit load, so it flags an open circuit fault (FTB -13).
- High resistance at an SRS connector or terminal: Light corrosion, fretting, or poor terminal tension raises resistance enough that the module interprets the circuit as open.
- Connector not fully seated after interior or headliner work: A partially latched connector can pass a quick continuity check yet open under vibration, setting B0029 during self-tests.
- Harness damage along the roof rail/A-pillar/B-pillar area: Curtain airbag wiring often routes near trim clips and sharp edges, and chafing can open the circuit without obvious external damage.
- Pinched wiring from body repairs or windshield replacement: Squeeze points near the roof line can cut strands inside the insulation and create an intermittent or hard open.
- Incorrect part or wrong-side component installed: A mismatched curtain module or connector keying workaround can leave the control circuit electrically “not present,” which the module reports as open.
- Poor module power or ground affecting circuit diagnostics: A weak feed or high-resistance ground at the SRS module can corrupt its ability to read deployment loop integrity and falsely indicate an open.
- Previous deployment or repair leaving an unaddressed break in the loop path: Post-collision repairs sometimes restore trim but miss a damaged section of the deployment circuit, so the SDM/RCM continues to detect an open.
Diagnosis Steps
Use a scan tool with full SRS access, OEM service information, and the correct SRS depower procedure for the vehicle. You also need a DMM and backprobing tools approved for SRS circuits, plus a voltage-drop test setup for power and ground checks. Do not probe deployment circuits with standard test leads. Follow OEM restraint handling rules at every step.
- Connect a capable scan tool and run a complete SRS scan. Record B0029 status (current/history) and any related codes. Save freeze frame or event data, especially ignition state, battery voltage, and any “fault present now” flags.
- Perform a careful visual inspection of the circuit path before meter work. Focus on the right roof rail, A/B/C-pillar trim areas, headliner edges, and any recent repair zones. Look for pinched harnesses, missing clips, or signs of trim screw intrusion.
- Check power distribution to the SRS system using OEM diagrams. Verify all SRS-related fuses and feeds. Confirm the correct ignition feed states, because some platforms power the module on multiple circuits.
- Depower the SRS system using the OEM procedure. Disconnect the battery as required and wait the specified time before touching SRS connectors. Do not skip the wait time, since reserve energy can remain in the module.
- Verify SRS module power and ground integrity under load. Re-enable power only when the OEM procedure allows it, then voltage-drop test module grounds with the system operating. Target less than 0.1 V drop on grounds under load, because a “good” unloaded reading can hide resistance.
- With the system depowered again, inspect connectors in the right curtain deployment control circuit. Check for bent pins, backed-out terminals, poor terminal drag, corrosion, and CPA/secondary locks not engaged. Confirm each connector clicks and locks fully.
- Use the OEM-approved method to isolate the circuit section-by-section. Many makes require a dedicated SRS test adapter or break-out harness. Do not substitute a generic jumper wire, and do not apply power to a deployment loop.
- Perform a harness continuity and isolation check only per OEM guidance for SRS circuits. Confirm continuity end-to-end on the specified conductors, then check for shorts between conductors and to ground. A true “open” often shows OL or unstable readings when you flex the harness.
- Wiggle-test the harness in the roof rail and pillar transitions while monitoring the scan tool for “fault present” status changes. Use a scan tool snapshot to capture the moment the fault flips. Remember: freeze frame shows conditions when the code set; a snapshot catches intermittent opens during your test.
- After you correct a verified wiring or connection issue, reassemble with proper routing and anti-chafe protection. Restore power following OEM steps. Clear SRS codes with the scan tool and run the module self-test. Confirm B0029 does not return on key cycles and a controlled road test.
Professional tip: Treat B0029 (FTB -13 open circuit) like a connector and harness problem until measurements prove otherwise. Many curtain circuit opens come from a half-seated connector behind the headliner after glass or body work. Confirm terminal tension and connector lock engagement, not just continuity.
Possible Fixes
- Reseat and correctly lock SRS connectors in the right curtain circuit: Fully connectors and engage secondary locks/CPAs after verifying clean, straight terminals.
- Repair or replace the damaged section of harness: Restore conductor integrity where you found chafing, pinch damage, or an internal break, and protect it with proper routing and abrasion control.
- Correct terminal fit issues: Replace backed-out, loose, or corroded terminals using OEM terminal part numbers and crimp procedures to restore proper contact pressure.
- Restore SRS module power/ground integrity: Clean and tighten ground points, repair power feed faults, and re-test with voltage-drop under load to prevent false open detection.
- Correct incorrect components or connectors from prior repairs: Install the correct right-side matched components and connectors so the SDM/RCM sees the proper circuit load and configuration.
Can I Still Drive With B0029?
You can usually drive the vehicle with a B0029 code, but you should not treat it as “safe.” B0029 means the SRS module sees an open circuit in the right curtain deployment control 1 circuit (SAE J2012DA FTB -13 = open circuit). That points to a fault in the deployment loop wiring, connector, or related SRS components, not a confirmed bad airbag. The vehicle will often drive normally, but the SRS system may disable the right curtain airbag function, and some platforms may inhibit other airbags to prevent an unintended deployment. Do not probe SRS connectors, and do not attempt DIY repairs. Follow OEM SRS depowering procedures and use a scan tool with full SRS access to confirm what the module disabled.
How Serious Is This Code?
This code is serious because it involves a supplemental restraint system circuit. B0029 rarely causes drivability problems, so it can feel like an inconvenience. The real risk is safety. The SRS module detected an open circuit condition, which can prevent the right curtain airbag from deploying when needed. Some vehicles also set a global SRS fault and switch off multiple deployment outputs. Treat the airbag system as potentially compromised until proven otherwise. Proper diagnosis requires SRS-certified equipment, OEM-approved test methods, and technician training. Avoid any connector work near the headliner, A-pillar, B-pillar, or SRS harness routing until you disable the system per service information.
Common Misdiagnoses
Technicians often misdiagnose B0029 by replacing the curtain airbag module without proving the circuit integrity. An open circuit fault commonly comes from connector issues at the curtain airbag, a damaged harness near the roof rail, or a poor terminal fit after trim work. Another frequent mistake involves using standard multimeter leads on SRS connectors, which risks terminal spread and false opens. Some shops also ignore the FTB -13 detail and chase shorts instead of open-circuit evidence. Avoid wasted parts by confirming the code status (current vs history), checking for related SRS codes, and performing OEM-approved resistance or loop checks only with the correct SRS breakout tools.
Most Likely Fix
The most common confirmed repair direction for B0029 is restoring continuity in the right curtain deployment control 1 circuit. In practice, that often means correcting a poor connection or terminal issue at an approved SRS connector, or repairing harness damage in the roof-side routing after body or headliner work. A second frequent direction involves addressing connector lock, CPA, or pin-fit problems that create an intermittent open that later becomes a hard open. Complete the repair by running an SRS self-test with an OE-capable scan tool and verifying the code stays cleared through the module’s recheck conditions, which vary by make and model.
Repair Costs
SRS/airbag repair costs vary significantly by component. Diagnosis must be performed by a qualified technician with SRS-capable equipment. Do not attempt airbag system repairs without proper training and safety procedures.
| Repair Type | Estimated Cost |
|---|---|
| Professional diagnosis (SRS-certified) | $150 – $250 |
| Wiring / connector / clock spring repair | $100 – $500+ |
| Side airbag / squib module replacement | $400 – $1200+ |
| SRS ECU replacement / reprogramming | $500 – $2000+ |
Key Takeaways
- B0029 meaning: The SRS module detected an open circuit in the right curtain deployment control 1 circuit (FTB -13).
- Safety impact: The right curtain airbag function may be disabled, and other SRS functions may be inhibited.
- Do not DIY probe: Standard test leads and guessing at connectors can damage terminals and increase risk.
- Best diagnostic path: Use an SRS-capable scan tool, confirm code status, then verify wiring/connector integrity with OEM-approved methods.
- Typical repair pattern: Fix connector pin-fit/locks or harness damage near the roof rail rather than replacing airbags first.
FAQ
What does B0029 mean?
B0029 means the SRS module detected an open circuit in the right curtain deployment control 1 circuit. The SAE J2012DA FTB suffix -13 specifically indicates an open circuit condition. In plain terms, the module cannot “see” the expected deployment loop continuity. This points to wiring, connector, or component path issues, not a guaranteed bad airbag.
What are the symptoms of B0029?
The most common symptom is an airbag or SRS warning light on the dash. A scan tool with SRS access will show B0029 stored as current or history. Some vehicles also display “Service Airbag” messages. You usually will not feel any drivability change. The safety impact matters most because the right curtain airbag function may not operate.
What causes B0029?
B0029 causes usually relate to an open in the deployment control circuit. Common sources include damaged wiring along the roof rail, loose or unlocked SRS connectors, terminal pin-fit problems, corrosion from water intrusion, or harness damage after headliner or pillar trim work. The module sets the code when the circuit continuity does not match expected values during its checks.
Can I drive with B0029, and do I need SRS-certified diagnosis?
You can typically drive, but you should assume the SRS system may not protect you as designed. B0029 involves a deployment circuit, so treat it as safety-critical. Use an OE-capable scan tool and follow OEM depowering steps before touching any SRS connector. SRS-certified diagnosis matters because incorrect testing can trigger faults or create unsafe conditions.
How do you fix B0029 and verify the repair is complete?
Fix B0029 by confirming and correcting the open circuit source, most often a connector lock/terminal issue or roof-rail harness damage. Do not replace parts until you verify circuit integrity with OEM-approved methods. After repair, clear codes with an SRS-capable scan tool and run the SRS self-test. Then drive under normal conditions until the module completes its recheck routine; the exact enable criteria vary by platform, so follow service information.