B1412 – Front passenger airbag squib grounding (Mitsubishi)

Mitsubishi-specific code — factory diagnostic data

Last updated: March 30, 2026

Definition source: Mitsubishi factory description · Autel MaxiSys Ultra & EV. Diagnostic guidance is based on factory-defined fault logic for this code.

B1412 means your 2016 Mitsubishi Outlander’s SRS computer detected a front passenger airbag “squib” circuit condition that looks like an unwanted ground. In plain terms, the airbag warning light will stay on and the passenger front airbag may not deploy as designed in a crash. According to Mitsubishi factory diagnostic data, this is a manufacturer-specific code defined as “Front passenger airbag squib grounding.” Treat it as a safety-critical electrical fault. Follow Mitsubishi SRS depowering procedures before touching any yellow SRS connector or harness. Use only OEM-approved test methods and a scan tool with full SRS access.

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B1412 Quick Answer

This code points to the front passenger airbag inflator (squib) circuit showing an abnormal path to ground. The SRS will disable or limit passenger airbag deployment until you correct the wiring or connection issue and confirm the repair with an SRS-capable scan tool.

What Does B1412 Mean?

Official meaning (Mitsubishi-defined): “Front passenger airbag squib grounding.” The SRS control unit detected a ground-related fault in the front passenger airbag igniter circuit. In practice, the SRS warning lamp turns on and the system may inhibit that airbag stage to prevent an unintended deployment.

What the module checks and why it matters: The SRS control unit monitors the squib circuit’s electrical integrity. It looks for normal resistance and insulation from chassis ground. B1412 sets when the control unit sees the squib line pulled toward ground when it should not. That matters because a grounded squib circuit can prevent proper deployment, or trigger protective shutdown logic. Diagnose the circuit first. Do not replace the airbag module or the SRS control unit without circuit proof.

Theory of Operation

Under normal conditions, the Mitsubishi SRS control unit continuously supervises the passenger airbag squib circuits. It uses internal monitoring to verify continuity and isolation. The wiring, connectors, and the airbag module form a controlled circuit that stays electrically “clean” from chassis ground.

For B1412, something creates an unintended ground path on the squib circuit. A pinched harness, water intrusion, connector damage, or terminal spread can do it. An aftermarket accessory ground or improper probing can also cause it. When the control unit detects that ground condition, it stores B1412 and commands the SRS warning light on to alert the driver.

Symptoms

You will usually notice an SRS warning first, followed by scan-tool evidence of a passenger airbag circuit fault.

• Airbag light SRS warning lamp illuminated and stays on
• Message “Airbag” or “SRS” warning message on the cluster, if equipped
• Passenger airbag status Passenger airbag may show disabled status depending on Mitsubishi logic and occupant classification inputs
• Stored DTC B1412 stored in the SRS control unit memory
• Current/History behavior Code may set as current during bumps or seat movement if the harness intermittently touches ground
• Inspection clues Evidence of harness rubbing near the dash, glove box area, or passenger-side kick panel
• Post-repair recurrence Code returns after interior work if a connector did not lock fully

Common Causes

• Passenger airbag squib circuit short-to-ground: Chafed insulation or pinched wiring lets a squib line contact body ground, so the SRS ECU detects “grounding.”
• High-resistance or bridged connector at the passenger airbag: Corrosion, moisture, or a partially seated connector can create an unintended ground path or distort the circuit signature.
• Under-seat harness damage affecting the passenger airbag path: Seat movement can pull, kink, or cut the yellow SRS harness, which can force a squib line toward ground.
• Incorrect probing or test method on SRS wiring: Standard test lights, jumper wires, or back-probing can damage terminals and create a ground fault the module later flags.
• Terminal push-out or poor pin tension at the SRS ECU connector: A backed-out terminal can contact adjacent grounded shielding or intermittently touch ground during vibration.
• Water intrusion in the dash or kick panel harness routing: Water tracks along the harness and increases leakage to ground, which the ECU interprets as grounding.
• Prior collision repair or dash work disturbing SRS routing: Misrouted harnesses can rub on brackets and slowly wear through to ground after reassembly.
• Internal fault in the passenger airbag module (squib side): An internal short to the airbag’s housing ground can present as grounding, but you must prove the harness integrity first.

Diagnosis Steps

You need a scan tool with full Mitsubishi SRS access, the correct OEM service information, and OEM-approved SRS test adapters. Use a DVOM only on the body-side wiring when the OEM procedure allows it. Depower the SRS system before touching any yellow connector. Do not use test lights, jumpers, or standard back-probes on squib circuits.

1. Confirm DTC B1412 in the Mitsubishi Outlander SRS menu and record all SRS codes. Save freeze frame data if available. Focus on ignition state, battery voltage, and any “present/active” status because this code often resets at key-on when a hard short exists.
2. Before any meter work, perform a fast visual check of the SRS power distribution path and related fuse/ground integrity. Verify SRS-related fuses and junction connections. Also inspect the harness routing you can see without disassembly for pinching or obvious rub-through.
3. Verify SRS ECU power and ground with voltage-drop testing under load. Command any allowed scan-tool SRS outputs only if the service information permits it. Measure ground drop while the module is powered; keep ground drop under 0.1 V. Do not rely on continuity checks alone.
4. Depower the SRS system using the Mitsubishi OEM procedure. Wait the specified time for reserve energy to discharge. Then disconnect the 12 V battery as directed. Do not touch any yellow connector until you complete depowering.
5. Inspect the passenger airbag and intermediate connectors you can access safely. Look for water tracks, bent terminals, terminal push-out, and CPA/lock issues. Confirm each connector seats fully and locks. Do not use standard probes on the terminals.
6. Inspect the harness path from the SRS ECU toward the passenger airbag area. Pay attention to dash bracket edges, sharp clip points, and any recent repair areas. Check for crushed loom, missing grommets, or tape wear that could allow a squib wire to touch ground.
7. Using only the OEM-approved test method, isolate the circuit in sections. Disconnect at the passenger airbag side (with SRS depowered) and test the body-side squib lines for short-to-ground. A true grounding fault will show continuity to chassis ground on the affected line when it should not.
8. If the body-side wiring tests clean to ground, reconnect sections one at a time to locate where the grounding appears. This step helps separate a harness fault from a component-side issue. Follow the Mitsubishi procedure for any use of simulators or resistive loads. Do not substitute homemade loads.
9. Recheck connector pin fit and retention on any connector that changed the fault during isolation. Lightly tug each wire at the rear seal to confirm it locks into the terminal. Repair terminal fit issues with the correct service parts, not improvised picks.
10. After repairs, restore the vehicle to stock routing and reassemble all connectors with locks engaged. Repower the SRS system per OEM steps. Clear codes with the SRS-capable scan tool and cycle ignition as directed. Confirm B1412 stays cleared and does not return immediately at key-on.
11. If B1412 returns as “current” right away, repeat isolation and verify you did not miss a short-to-ground point. Use a scan-tool snapshot during a harness wiggle test to catch intermittent grounding. Remember the difference: freeze frame shows conditions when the DTC set, while a snapshot captures live data during your test.

Professional tip: Treat B1412 as a suspected short-to-ground in a safety-critical squib circuit, not a guaranteed bad airbag. On Mitsubishi platforms, a hard grounding fault often reappears immediately after key-on. If the fault status flips while you move a harness or connector, you found your direction. Fix connector integrity and routing first, then retest before condemning any SRS component.

Possible Fixes

• Repair short-to-ground in the passenger airbag squib wiring: Restore insulation, reroute away from brackets, and secure the loom to prevent repeat rub-through.
• Clean, dry, and correct connector issues: Remove moisture sources, correct terminal push-out, and restore proper pin tension using approved terminal service parts.
• Repair under-dash or under-seat harness damage: Replace or properly splice per Mitsubishi SRS wiring repair rules, then secure the harness to prevent movement-related faults.
• Correct aftermarket or prior-repair wiring errors: Remove improper splices, crimp taps, or added grounds near SRS wiring and return routing to OEM layout.
• Replace the passenger airbag module only after circuit proof: Replace only when isolation testing proves the body harness does not short to ground and the fault follows the component side per OEM procedure.
• Address water intrusion root cause: Repair leaks and replace contaminated connectors or sections of harness when leakage to ground persists.

Can I Still Drive With B1412?

You can usually drive a 2016 Mitsubishi Outlander with DTC B1412, but you should not ignore it. This code relates to the front passenger airbag squib circuit and a grounding fault. That makes the SRS system potentially compromised. The car will still steer, brake, and accelerate normally. However, the airbag warning lamp often stays on and the SRS ECU may disable part of the restraint system. Treat the passenger airbag as unreliable until you complete a proper SRS diagnosis. Do not attempt DIY probing or connector work on SRS wiring. Depower the SRS and follow Mitsubishi procedures before any inspection.

How Serious Is This Code?

B1412 is serious because it points to an SRS squib circuit grounding concern. A grounding fault can prevent correct deployment, trigger unwanted fault detection, or force the SRS ECU to shut down one or more airbag outputs as a protective action. This is not a drivability problem, but it is a safety problem. In rare cases, harness damage or improper handling can raise risk during service. Diagnosis requires a scan tool with full Mitsubishi SRS access and OEM-approved test methods. Only technicians trained on SRS systems should perform circuit checks. Never use standard test lights or jumper wires on airbag squib circuits.

Common Misdiagnoses

Technicians often replace the passenger airbag module or clockspring without proving the ground fault path. That wastes money and can add new faults. Another common miss involves the seat harness and connectors. Shops blame “loose yellow connectors” and disconnect them without depowering the SRS. That creates more DTCs and safety risk. Some techs also measure resistance with a regular meter across squib circuits. Mitsubishi SRS circuits require approved adapters and procedures. The correct approach verifies connector condition, harness routing, and short-to-ground isolation first. Confirm the fault with SRS data and repeatable tests before replacing any component.

Most Likely Fix

The most common confirmed repair direction for B1412 involves correcting a short-to-ground in the front passenger airbag squib wiring or at its connectors. Harness chafing, pinched wiring, or moisture intrusion can create the ground path. A second frequent direction involves terminal damage at an SRS connector, which raises the chance of a ground bridge inside the connector body. Do not treat these as certain until you depower the SRS, inspect the exact squib circuit path, and verify the fault clears only after the circuit passes insulation and continuity checks using Mitsubishi-approved methods.

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.