The most prevalent issue is a persistent or intermittent airbag warning light, usually tied to a failed occupant classification system (OCS) control unit in the passenger seat cushion. Owners report the light illuminates while stationary or driving, often between 60,000 and 168,000 miles. Some say the light temporarily shuts off if they manipulate the connector under the passenger seat, then returns. Diagnostic codes like B1049 confirm OCS or airbag module failure. Repair costs run $3,000–$3,950 for full passenger seat replacement; driver-side airbag assembly replacement costs around $1,200.
A major frustration across complaints is Nissan's October 2008 recall 08V521000, which targeted the OCS defect but excluded many 2007–2008 Murano VINs, leaving those owners with out-of-warranty repair bills. Owners point out the same Continental OCS system was used across excluded VINs and covered models, questioning why the recall didn't blanket all affected units.
One owner reported total airbag failure: in a 70-mph head-on collision, the driver airbag did not deploy, though the passenger bag did. Another owner's control module failed completely, with the dealer stating the airbags "may or may not deploy" in a crash. A third report describes spontaneous deployment after hitting a parking lot pothole at normal speed.
Failure modes owners describe
Passenger-side Occupant Classification System (OCS) Control Unit Failure
The passenger seat cushion OCS control unit (or diagnostic module) fails, causing the airbag warning light to illuminate or flash intermittently. In some cases, owners report the light will turn off temporarily if they manipulate the connector under the seat. The underlying issue stems from a varistor in the OCS control unit manufactured out of specification, which can interrupt the signal between the OCS and the air bag control unit (ACU).
When: 60,000–168,000 miles; failures occur both while stationary and while driving
Symptoms owners cite: Airbag warning light flashing or illuminated continuously; Intermittent airbag light that recurs after reset; Light turns off temporarily if seat connector is manipulated; Light illuminates when passenger moves around in seat
Codes mentioned: B1049 (Airbag diagnosis sensor and/or airbag module)
Repairs/costs cited: Passenger seat cushion and diagnostic module replacement cost $3,000–$3,950; requires full seat replacement at dealer
Recalls/TSBs owners mention: NHTSA Recall 08V521000 (October 2008) covers 2007–2009 Muranos equipped with Continental OCS units. However, owners report many 2007–2008 Murano VINs were excluded from the recall despite having the identical system. Nissan has refused financial assistance or warranty coverage for out-of-recall vehicles.
Driver-side Airbag Assembly Failure
The driver-side airbag assembly fails, indicated by an illuminated airbag warning light. Owners report the light comes on unexpectedly without any collision or abuse, and dealers diagnose the need for full driver airbag assembly replacement.
When: No specific mileage provided; failures occur during normal driving
Symptoms owners cite: Driver-side airbag warning light illuminates; Light remains on continuously
Repairs/costs cited: Complete driver airbag assembly replacement cost approximately $1,200
Airbag Deployment Failure
The airbag system fails to deploy during a crash event. In one documented case, a 70-mph head-on collision resulted in the driver airbag not deploying while the passenger airbag did deploy. In another case, the control module does not function, and dealers advise the airbags may or may not deploy in a wreck.
When: No specific mileage noted; occurred during high-speed collision (70 mph)
Symptoms owners cite: Driver airbag did not deploy in major head-on collision; Control module non-functional; uncertain deployment capability; Airbag warning light present before failure
Repairs/costs cited: Main control module replacement cost $1,100 plus labor
Intermittent Airbag Warning Light Without Diagnostic Codes
The airbag warning light illuminates or flashes, but no diagnostic failure codes can be retrieved. The light recurs after the vehicle is reset. Dealers are unable to replicate the failure or identify the root cause.
When: 97,000–100,000 miles; occurs while stationary and during driving
Symptoms owners cite: Airbag warning light flashes or illuminates; Light recurs after reset; No diagnostic codes present; Failure cannot be replicated
Repairs/costs cited: No repairs performed; vehicles reset only
Spontaneous Airbag Deployment
The airbag deployed without collision, triggered by a pothole in a parking lot. While the vehicle was traveling at normal speed through a parking lot with known potholes, the driver encountered a pothole at typical speed and the airbags deployed seconds later.
When: No specific mileage provided; occurred at parking lot with potholes
Symptoms owners cite: Airbag deployed spontaneously while driving over pothole; Deployment without collision impact
Synthesized from 20 NHTSA owner complaints — unverified consumer
allegations, summarized for patterns. The verbatim filings appear below.