Mitsubishi-specific code — factory diagnostic data| DTC Data Sheet | |
| System | Body |
| Standard | Manufacturer Specific |
| Fault type | General |
| Official meaning | Passenger lap pretensioner squib open |
Definition source: Mitsubishi factory description · Autel MaxiSys Ultra & EV. Diagnostic guidance is based on factory-defined fault logic for this code.
B1626 means the airbag system has found a problem in the passenger seat belt lap pretensioner circuit. In real terms, the SRS warning light will stay on and the passenger lap pretensioner may not fire in a crash. This is a Mitsubishi manufacturer-specific code, so the exact detection logic can vary by platform. According to Mitsubishi factory diagnostic data, this code indicates “Passenger lap pretensioner squib open.” Treat this as a safety-critical electrical fault. Depower and disable the SRS using OEM procedures before you touch any related connectors or wiring.
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B1626 Quick Answer
On a 2016 Mitsubishi Outlander, B1626 points to an open circuit in the passenger lap pretensioner squib circuit. The SRS module cannot verify the pretensioner’s electrical load, so it turns the airbag warning on.
What Does B1626 Mean?
Official definition: “Passenger lap pretensioner squib open.” The SRS module detected an open in the passenger lap pretensioner igniter circuit. In practice, the restraint system may disable that pretensioner output and store the code, which leaves the SRS warning lamp on.
What the module is checking: The SRS control unit monitors the pretensioner squib loop for continuity and a plausible resistance range. An “open” result means the loop looks broken to the module. Why it matters: This DTC points to a suspected trouble area, not a confirmed bad pretensioner. You must verify connectors, wiring integrity, and terminal fit using Mitsubishi-approved SRS test methods before any parts decisions.
Theory of Operation
Under normal conditions, the Mitsubishi SRS control unit sends a low-energy diagnostic current through each squib loop. The passenger lap pretensioner contains an igniter that the module can monitor as an electrical load. If a crash meets deployment criteria, the module commands current to fire the pretensioner and retract the belt.
B1626 sets when the module sees the passenger lap pretensioner squib circuit as electrically open. A loose connector, poor terminal tension, corrosion, harness damage, or a faulty internal connection can break the loop. SRS circuits use shorting bars and special connectors, so improper probing can create false opens. Always disable the SRS and use OEM-approved back-probing and adapter tools.
Symptoms
You will typically notice at least one of the following symptoms with B1626 on a Mitsubishi Outlander.
- SRS warning lamp illuminated and stays on
- Passenger pretensioner function may disable due to stored fault
- Stored SRS DTC B1626 present in the airbag control unit memory
- Freeze frame or event data may show the fault occurred during seat movement or recent service
- Intermittent fault behavior light may cycle with passenger seat position changes
- Inspection failure vehicle may fail safety inspection due to SRS lamp on
Common Causes
- Disconnected passenger lap pretensioner connector: A partially seated connector opens the squib circuit and the SRS module flags an open condition.
- High resistance from terminal fretting or corrosion: Small increases in contact resistance can look like an open circuit to Mitsubishi’s SRS monitoring logic.
- Harness damage under the seat or along the B-pillar/floor: Seat movement or cargo impacts can stretch, pinch, or cut the pretensioner wiring and break continuity.
- Aftermarket seat covers or seat repairs disturbing SRS wiring: A recent interior repair can pull on the pretensioner lead or compromise connector locking tabs.
- Incorrect connector engagement after seat removal: Technicians often reconnect the plug but miss the secondary lock, leaving an intermittent open.
- Poor ground or power feed quality to the SRS control unit: A high-resistance power or ground can disrupt the module’s internal squib monitoring and mimic an open circuit.
- Passenger lap pretensioner squib circuit fault within the belt assembly: Internal squib lead issues inside the pretensioner can create an open even when the external harness looks perfect.
- Improper testing methods or probing damage: Backprobing or forcing test leads into SRS terminals can spread pins and create the open you are chasing.
Diagnosis Steps
Use a scan tool with full Mitsubishi SRS access, plus OEM service information and approved SRS depower procedures. You also need a quality DMM, a fused load or test lamp for non-SRS power/ground checks, and backprobing tools approved for the connector type. Do not probe squib circuits with standard leads. Follow OEM-approved methods only.
- Confirm B1626 in the SRS system and record DTC status and all related SRS codes. Save freeze frame or event data. Focus on battery voltage, ignition state, and whether the fault set at key-on or during driving. Freeze frame shows conditions when the code set. A scan tool snapshot captures an intermittent open while you move the harness.
- Perform an SRS safety setup before touching anything near the pretensioner. Depower the SRS system using Mitsubishi’s procedure and wait the specified time. Do not disconnect yellow SRS connectors with the system powered. Keep the key away from the vehicle during this step.
- Check fuses and SRS power distribution first, before any SRS connector work. Inspect related fuse links and junction connections for heat damage or looseness. Verify the battery condition and charging health. Low system voltage can trigger false SRS monitoring results.
- Verify SRS module power and ground quality under load. Use voltage-drop testing, not continuity alone. Load the circuit and measure ground drop. Keep ground drop under 0.1V with the circuit operating. Repeat on the main SRS power feed path to catch high resistance.
- With the SRS still depowered, inspect the passenger lap pretensioner circuit path visually. Focus on under-seat routing, seat track pinch points, and any areas that flex. Look for crushed conduit, pulled tape, exposed copper, and signs of previous repair. Confirm harness clips keep the loom away from moving rails.
- Inspect the passenger lap pretensioner connector and CPA/secondary lock. Check for bent terminals, terminal push-out, and corrosion. Verify the connector body has no cracks. Make sure the connector fully seats and the lock engages positively. Do not use grease or cleaners unless Mitsubishi service information allows it.
- Use the OEM-approved SRS test method to evaluate the squib circuit without firing risk. Follow Mitsubishi procedures for checking the circuit from the harness side. Do not use a standard ohmmeter directly across the pretensioner squib. If the platform uses a dedicated check tool or adapter, use it exactly as specified.
- Perform a controlled wiggle test while monitoring SRS data with a scan tool. Repower the system only after you complete all connector seating and reassembly steps. Watch for the code returning immediately on key-on, which indicates a hard open. If the concern seems intermittent, use a scan tool snapshot while you move the harness and connector gently.
- If the circuit checks good at the pretensioner end, test the same circuit from the SRS module side using OEM-approved adapters. Compare results end-to-end to isolate the harness section. Pay attention to areas where the harness transitions from body to seat wiring. An open that appears only from one side points to a harness break or terminal issue.
- After correcting the root cause, clear SRS DTCs with a capable scan tool and cycle the ignition as directed. Confirm the SRS warning lamp proves out correctly and stays off. Recheck for pending or stored SRS codes. Validate the fix with a final harness movement check to ensure the open does not return.
Professional tip: Most Mitsubishi “squib open” faults on pretensioners trace back to connector security and terminal tension under the seat. Treat every under-seat connector like a vibration problem first. Confirm the secondary lock engagement and terminal fit before suspecting the belt assembly. Never create a failure by spreading terminals with improper probes.
Possible Fixes
- Reseat and secure the passenger lap pretensioner connector: Fully seat the connector and engage the secondary lock after correct SRS depowering.
- Repair harness damage in the pretensioner circuit: Restore wiring integrity where the loom pinches, stretches, or breaks, using OEM-approved repair methods.
- Replace damaged terminals or connector body: Correct terminal push-out, corrosion, or loss of tension with the proper service parts and crimping tools.
- Correct routing and retention under the seat: Re-clip and reroute the harness to prevent future pullout or chafing during seat travel.
- Restore SRS power/ground integrity: Clean and secure power distribution points and grounds after voltage-drop testing confirms excess resistance.
- Replace the passenger lap pretensioner assembly only after circuit proof: Replace the belt/pretensioner unit when OEM-approved circuit tests show the fault remains internal to the pretensioner.
Can I Still Drive With B1626?
You can usually drive a 2016 Mitsubishi Outlander with B1626, but you should treat the SRS as compromised. This code means the SRS control unit sees an open circuit in the passenger lap pretensioner squib circuit. A pretensioner may not fire in a crash. The airbag warning light will often stay on, and Mitsubishi may disable part of the restraint system to prevent unintended deployment. Do not ignore this and do not attempt DIY SRS wiring repairs. Follow Mitsubishi SRS depowering procedures before any inspection, and use a scan tool that can access and clear Mitsubishi SRS faults.
How Serious Is This Code?
B1626 is safety-critical, not a drivability complaint. The engine will usually run normally, so it can feel like an inconvenience. In a collision, however, the passenger lap pretensioner may not tighten the belt as designed. That increases occupant injury risk. Because this DTC involves a squib circuit, diagnosis requires SRS-safe methods and technician training. Never probe squib circuits with standard test leads or a powered test light. Use only OEM-approved adapters and procedures, and keep the SRS depowered any time you disconnect or handle SRS connectors.
Common Misdiagnoses
Technicians often replace the passenger belt assembly or pretensioner immediately because the code says “open.” That wastes money when the real issue is a loose connector under the seat, a connector lock not fully seated, or harness damage from seat track movement. Another common error involves using a standard ohmmeter directly across the squib or backprobing SRS terminals with sharp probes. That can damage terminals and violate SRS-safe testing practices. Misreading seat-related codes also happens when the scan tool shows a generic description without Mitsubishi-specific SRS data. Avoid this by confirming the exact circuit location in service information, verifying connector engagement, and using an approved SRS simulator or breakout method before condemning parts.
Most Likely Fix
The most commonly confirmed repair direction for B1626 on Mitsubishi platforms involves restoring circuit continuity at the passenger lap pretensioner connection. That usually means correcting a partially seated under-seat SRS connector, repairing a pulled or chafed harness section at the seat track area, or cleaning and securing terminals that show fretting or poor pin tension. Only after you verify the harness and connector integrity with OEM-approved SRS test methods should you consider replacing the pretensioner or belt assembly. After repair, confirm the SRS passes a self-check and that B1626 stays cleared during multiple key cycles and seat movement.
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
- B1626 indicates an open circuit in the passenger lap pretensioner squib circuit on Mitsubishi.
- The vehicle may drive normally, but crash protection can drop because SRS functions may disable.
- Use SRS-safe procedures and depower the system before touching SRS connectors or wiring.
- Verify the circuit first at under-seat connectors and seat-track harness routing before parts replacement.
- Confirm the repair with an SRS-capable scan tool and repeat checks after moving the seat.
FAQ
Is it safe to diagnose or repair B1626 at home?
No. B1626 involves an SRS squib circuit, and incorrect testing can trigger deployment or damage the SRS controller. Mitsubishi procedures require depowering the SRS and using OEM-approved test methods. A qualified technician will use approved adapters or simulators and an SRS-capable scan tool. Avoid backprobing or measuring resistance across squibs.
What does “squib open” actually mean on this Mitsubishi code?
“Open” means the SRS control unit detects too much resistance or no continuity in the passenger lap pretensioner igniter circuit. The cause often sits between the SRS ECU and the pretensioner, not inside the module. Focus on connector seating, terminal fit, and harness damage near the passenger seat. Confirm the suspected section with approved SRS diagnostics.
What areas fail most often on a 2016 Outlander for this code?
The highest-risk area is the under-seat harness and connectors because the seat moves and the wiring flexes. Look for a connector lock not fully engaged, a harness pulled tight, or insulation rubbed through at the seat track. Also check for prior seat removal or interior work. Always depower SRS before touching these connectors.
How do I verify the repair is complete and the code will not return?
Use a scan tool that supports Mitsubishi SRS to clear B1626 only after you complete the repair. Then run several ignition cycles and perform a controlled seat movement check. The SRS performs internal self-checks at key-on, and enable criteria vary by platform. Consult service information to confirm the exact confirmation procedure and conditions.
Does fixing B1626 require programming or calibration afterward?
Usually no. Connector or harness repairs do not require programming. If you replace an SRS component, follow Mitsubishi service information for initialization steps and any required configuration. Some SRS controllers store crash or fault data that affects clearing and verification. Plan to use a factory-level scan tool or equivalent that can run Mitsubishi SRS routines.