B1182 – Left front pretensioner 2 (Nissan)

B1182 means the Nissan Qashqai has a fault stored for the left front seat belt pretensioner 2 circuit. In plain English, the SRS airbag light may stay on and the restraint system may disable some protection features. According to Nissan factory diagnostic data, this is a Nissan-defined code meaning “Left front pretensioner 2.” Treat this DTC as a pointer to a suspected trouble area, not proof of a bad part. Because this involves SRS pyrotechnic devices, follow Nissan depowering procedures before you touch any related connector. Use only OEM-approved test methods and a scan tool with full SRS access.

B1182 Quick Answer

B1182 on Nissan points to a problem in the left front pretensioner 2 circuit. Diagnose the wiring, connectors, and SRS control unit inputs first, using SRS-safe procedures, before replacing any pretensioner parts.

What Does B1182 Mean?

Official definition: “Left front pretensioner 2.” The SRS control unit flags a fault related to the second pretensioner circuit on the left front seating position. In practice, the SRS warning lamp commonly stays on and the system may limit or disable pretensioner deployment for that position.

What the module is checking: The Nissan SRS control unit continuously monitors the pretensioner circuit for electrical plausibility. It watches for conditions like an open circuit, a short to ground, a short to power, or abnormal resistance seen through its internal monitoring. Why that matters: The same DTC can result from a connector issue, damaged harness, seat movement stress, or an internal fault in a component. You must confirm the circuit condition with approved methods before you condemn a pretensioner or the SRS control unit.

Theory of Operation

Under normal conditions, the Nissan SRS control unit supervises the pretensioner circuits while the vehicle operates. The pretensioner contains a pyrotechnic actuator that tightens the belt during a qualifying crash event. The module uses a dedicated circuit path and connector system designed to prevent accidental deployment.

When the control unit sees an electrical condition outside its expected range on the left front pretensioner 2 circuit, it stores B1182 and requests the SRS warning lamp. Seat track movement, connector fretting, corrosion, or harness strain near the seat often changes circuit integrity. The module reacts to protect against unintended deployment and to avoid relying on a circuit it cannot verify.

Symptoms

These are the most common signs technicians and owners see with B1182 on a Nissan Qashqai.

• SRS warning lamp illuminated or flashing on the cluster
• Airbag system message shown on the information display, if equipped
• Pretensioner readiness reduced or disabled for the left front position
• Stored SRS DTCs that return immediately after correct clearing procedures
• Intermittent fault that appears after moving the seat or changing seat position
• Additional SRS codes related to the same seat-side harness or connector group
• No drivability change to the engine or transmission, despite the safety warning

Common Causes

• Connector not fully latched at the seat belt retractor/pretensioner: A partially seated connector increases resistance and the Nissan SRS module flags the left front pretensioner 2 circuit as implausible.
• High resistance from corrosion or moisture intrusion: Moisture in a seat-side or B-pillar connector changes circuit resistance enough to trigger B1182 during key-on self-check.
• Open circuit in the pretensioner 2 wiring: A broken conductor from seat movement or harness strain interrupts continuity and the module detects a circuit fault.
• Short to ground or short to power in the harness: Chafed insulation near seat tracks or trim brackets can short the pretensioner circuit and set the code quickly.
• Pin fit or terminal tension loss: Spread terminals create an intermittent connection that fails during vibration, seat adjustment, or temperature changes.
• Previous seat removal or interior work damage: Technicians can pinch, pull, or misroute the SRS harness, which later opens or shorts under seat travel.
• Incorrect component or harness section installed: A non-matching seat belt/pretensioner sub-harness or wrong-side part can create an out-of-range circuit condition.
• Internal pretensioner assembly fault (suspected, not proven by the DTC alone): An internal defect can change the circuit characteristics, but you must verify the wiring and connections first.

Diagnosis Steps

Use a scan tool with full Nissan SRS access, plus OEM service information for SRS depowering steps and connector handling rules. Have a quality DMM for power and ground voltage-drop tests. Use only OEM-approved SRS test methods for pretensioner circuits. Do not probe SRS connectors with standard test leads or a test light.

1. Confirm B1182 in the SRS/Airbag module and record all related DTCs. Save freeze frame data if the tool provides it. Focus on battery voltage, ignition state, and any “current/active” status that shows a hard fault versus an intermittent.
2. Perform the required Nissan SRS depowering procedure before touching any SRS connector. Follow the exact wait time and precautions in service information. Then do a visual inspection of the left front seat belt/pretensioner harness routing and any recent repair areas before any meter work.
3. Check fuses and power distribution that feed the SRS system and any related interior power supplies. Verify the fuse type and fit in the fuse box. A poor fuse connection can drop voltage during crank and set SRS faults.
4. Verify SRS module power and ground integrity using voltage-drop testing under load. Backprobe only at approved points and follow OEM guidance. Target less than 0.1 V drop on grounds with the circuit operating, because continuity checks can miss high resistance.
5. Inspect the left front pretensioner 2 connector and any inline connectors on that circuit path. Look for corrosion, water tracks, bent pins, pushed-out terminals, or broken locks. Confirm the connector latch clicks and stays locked after a light pull test.
6. Inspect harness sections that move with the seat or run near sharp edges. Pay attention to areas near seat tracks, trim brackets, and pass-through grommets. Repair any chafing and correct routing so seat travel cannot pinch the harness again.
7. Use the scan tool to check SRS data and perform any available “self-diagnosis” or “current data” review for the pretensioner circuit. If the tool supports it, compare left versus right side readings to spot an outlier. Do not clear codes as a test step.
8. Carry out OEM-approved circuit checks for the pretensioner 2 circuit. Use only the specified test adapters or breakout methods. Verify you can detect an open, a short to ground, or a short to power in the harness without directly measuring through the pretensioner device.
9. If the fault acts intermittent, use a scan-tool snapshot while you gently manipulate the harness and connectors. Freeze frame shows conditions when the DTC set. A snapshot captures live data during your wiggle test and can pinpoint a poor terminal fit.
10. After you correct the verified root cause, restore the system per Nissan procedures and run the SRS self-check. Confirm B1182 stays cleared and does not return on key-on. Recheck for any additional SRS codes that may have been masked by the primary fault.

Professional tip: Treat this as a circuit integrity problem first, not a pretensioner replacement call. Seat movement causes repeat failures when someone “fixes” only the connector. Confirm terminal tension and harness strain relief, then verify the repair with multiple seat position changes and repeated key cycles.

Possible Fixes

• Reseat and secure the pretensioner 2 connector: Fully latch the connector, confirm lock engagement, and restore proper strain relief so the connection cannot loosen.
• Repair wiring damage in the seat-side SRS harness: Correct chafing, pinched sections, or broken conductors using OEM-approved SRS wiring repair methods.
• Clean and correct terminal issues: Address corrosion and replace damaged terminals or connector bodies when pin fit or terminal tension fails inspection.
• Correct harness routing and retention: Reclip and reroute the harness to prevent seat track contact and repeat shorts or opens.
• Replace the left front pretensioner assembly only after circuit verification: Replace the component only if OEM-approved testing and wiring checks prove the device or its integrated lead fails.
• Restore proper power/ground to the SRS system: Repair high-resistance grounds, poor fuse connections, or power feed issues confirmed by voltage-drop testing.

Can I Still Drive With B1182?

You can usually drive a Nissan Qashqai with B1182 without engine performance issues, but you should not treat it as “safe to ignore.” This code points to the left front pretensioner 2 circuit, which the SRS control unit uses during a crash event. When the module flags this fault, it can disable part of the restraint strategy. That can reduce occupant protection. Do not attempt DIY probing or connector checks with the SRS powered. Depower the SRS using Nissan procedures before any inspection. Plan the repair soon, and use a scan tool that can access Nissan SRS data and clear codes correctly after the fix.

How Serious Is This Code?

B1182 carries high safety significance because it involves the seat belt pretensioner circuit. Driveability usually stays normal, so some owners think the problem is minor. It is not. Treat the SRS system as potentially compromised until you confirm the root cause and restore correct circuit integrity. This fault demands SRS-safe handling, OEM-approved test methods, and the correct scan tool functions. Avoid back-probing, resistance checks with standard meters, or “quick jumper” testing at the pretensioner connector. A technician trained on SRS systems should handle diagnosis and repair, because incorrect testing can trigger deployment or damage the control unit.

Common Misdiagnoses

Technicians often replace the belt retractor or pretensioner first because the description names the pretensioner. That wastes money when the real issue sits in the connector, harness routing, or a poor terminal fit under the seat area. Another common mistake involves testing the squib circuit with an ohmmeter or test light. That violates SRS handling rules and can damage components. Shops also misread “pretensioner 2” and assume a second device exists at the buckle. On some Nissan platforms, the “2” refers to a separate stage or circuit path. Confirm the circuit identity with Nissan service information. Finally, many generic scan tools show limited SRS data. That leads to guessing because the tool cannot display subcodes, freeze frame, or current/previous status.

Most Likely Fix

The most common confirmed repair direction involves correcting high resistance or an intermittent open in the left front pretensioner 2 wiring path. Focus first on the connector interface and harness strain points. Seat movement and vibration often stress terminals and wiring near the seat base and sill routing. After you depower the SRS, inspect for terminal spread, corrosion, and poor connector lock engagement, then repair the wiring or terminals using Nissan-approved methods. If circuit checks prove the wiring and terminals pass all integrity tests and the fault persists, then suspect the pretensioner assembly itself. Do not replace parts until you verify the circuit.

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.

Last updated: April 3, 2026