B00B6: Driver Seat Recline Position Restraints Sensor
What to do
The car drives normally with the airbag light on. Worth knowing in the meantime: a reclined seat is genuinely less safe in a crash, because the lap belt can slide off the hips. Sit upright and belted properly while this is unfixed.
What this code means
The driver seat recline position sensor circuit is faulty.
Occupant sensing exists because a deploying airbag is dangerous to somebody in the wrong place, and the system has to know who is in the seat before it decides what to do.
The problem it solves is real and was learned expensively. Early airbags deployed at one force regardless of who was there, and they injured and killed children and small adults in crashes that would otherwise have been survivable. A bag inflating at three hundred kilometres an hour into someone sitting close to it is a weapon, which is why the industry moved to systems that can soften, delay or suppress deployment.
Two quite different questions are being asked, and the standard gives them separate codes. Classification asks who — an adult, a small adult, a child, a child seat, or an empty seat — and is answered mostly by weight. Position asks where — how far the occupant is from the airbag, and whether they are leaning into its path.
Both matter because either alone gives wrong answers. A heavy adult leaning forward is in as much danger from the bag as a light one sitting normally, and weight cannot see that.
A reclined seat back breaks the geometry the seat belt depends on, and this sensor is how the car knows.
The lap belt only works if it lies across the pelvis. Recline the seat and the hips slide forward relative to the belt, so in a crash the occupant goes under it — submarining, the same failure the knee bolster at B0004 exists to prevent. The belt then loads the abdomen instead of the hip bones, which is among the more serious injuries a restraint system can inflict.
It is also why sleeping passengers are more at risk than they feel. A reclined seat is comfortable and it is the worst position to be in during an impact, and nothing about it feels dangerous.
Knowing the recline angle lets the module adjust what it can — pretensioner timing, deployment force — and losing the reading means it assumes an upright occupant who may not be there.
Likely causes
Start here
- Damaged wiring under the front seats · specialist
- Faulty seat position sensor · specialist
- Corroded or loose connector · specialist
Less common
- Damaged wiring harness · specialist
- Faulty restraints control module · specialist
Symptoms
Components involved
Information, not instruction
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Community experience
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