BMW Z3 airbag light fault codes
Z3 airbag light is on: how do you read the fault codes?
The OBD connector alone only reaches the engine control unit, so the airbag module codes cannot be seen from there. The other control units are read from the round 20-pin diagnostic connector in the engine bay with a suitable tool.
What usually causes the Z3 airbag light to come on?
A common cause is the seat occupancy mat or its wiring harness. Moisture in the sensor connector can also cause a fault. Find the real cause of the fault with the help of the fault code. The SRS parts under the seat should be left for a workshop to check.
Why does the Z3 airbag light not go out after the fault is repaired?
The light does not go out by itself; the fault memory has to be reset with a diagnostic tool. If the light comes back on after the reset, the fault is still there, for example in the connector or the wiring harness. Clearing the code does not fix the fault, it only empties the memory.