Re: [opendiag] ---BMW airbag light is on??

From: Hans Peil <hanspeil@...>
Date: Wed Sep 24 2003 - 11:22:57 CEST

Hi,

Your problem isn't new on BMW and often present. Pressure sensor and
wire are the problem.
Cause in most trouble is broken wire or bad connectors.
If your airbag light is on there is no function. All AB-ECU's have a
EEPROM store the faults and you have to clear
the memory after repair with diagnostic. You can simple encircle the
fault with short wires to front-right seat but do it
with "ignition off" and after your action switch ignition on to see the
results.
Basically if the light goes on there is a fire/sensor line broken. ECU
send with ignition on a power to all fire circle to test the resistor.
Please don't test your fire lines with high current ( > 5 mA) a big-bang
could be the result.
Unfortunately I haven't software for BMW airbags.

Hans

Kemenes Robert schrieb:

>Hello.
>I have a problem with airbag on BMW 320d(e46) made in 2000.
>The error for the first time was a litle bit strange for me, but it has a
>logic.
>Here is the scenario.
>If somebody sitting in the front-right seat the Airbag light is on. Not
>allway, just sometims. Depending on the sitting position in the seat.
>We removed the seat to see what is the problem. And we found out ht
>following thing.
>There is a cable connectet from the floor into the seat main connector.
>From that main connector goes one part to the seat belt sensor and the
>second part goes into a black box, and from this black box two wire goes
>into the seat.(There is a pressure sensor. I think).
>
>-I thought maybe there is a contact problem between the wires. And I tried
>to move them, but nothing.
>
>-I removed the connection betwen the black box and the seat main connector.
>Then the airbag light was on.
>-I connected back the connector and the airbag light goes off.
>
>-I removed the connetion between the Black box and the pressure sensor. Then
>the Airbag light is on.
>-I connected back that sensor to the balck box, and the airbag light was
>off.
>
>-When I removed the seat main connector(to remove the seat from the car) the
>airbag light goes on. Then I connected back and the irbag light remaind on.
>
>I found where the problem is. The problem is with the pressure sensor. When
>somebody sitting in the seat the wireing in the seat is broken.
>
>The connectionsw is same as before, but now the airbag light is allways on.
>
>What do you think. why the airbag light remaind on?
>-Maybe the car memorized in the ECU the airbag problem?
>-Maybe I have to clear the error code from the ECU to switch off the airbag
>light.?
>
>Do you have any kind of PC software to read out the fault codes from BMW
>e46? (320d)
>
>Any advice are welcome.
>
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Received on Wed Sep 24 02:23:09 2003