SRS fault

[hogweed]

Originally Posted by Phil-T4

The capacitor would be bigger than the car if it could hold on to a charge for that long

Wouldn't that depend if it was connected to anything Phil? I kind of visualised one sitting somewhere, open circuit, me accidentally giving it a path to earth, and bang...

Not that I should argue, I failed my Physics in school

[xamtex]

i have bought an airbag ecu off ebay and tomorrow we will see if it will fix the problem.

[Lovel]

Originally Posted by xamtex

the ecu is indeed dead...took it to a mate with a 5 grand code reader and its not seeing the ecu either....im ordering an ecu off ebay soon,see if that improves matters?

Before changing the ECU out, I would advise you to disconnected the crash sensor/s which do fail due to water ingress from leaks, then try reading with your diagnostics tool.

The crash sensors are located under the carpet. You need to remove the seats though to get in properly. Not too bad a task, and at the same time you can sort out the under seat connectors for good.

This will save you having to re-configure the vehicle with T4 later on if you swap ecu out.

[xamtex]

surely if the sensors were at fault the ecu would tell me this?i cannot link to the ecu at all which indicates a fault with the ecu?

[Lovel]

Originally Posted by xamtex

surely if the sensors were at fault the ecu would tell me this?i cannot link to the ecu at all which indicates a fault with the ecu?

In my experience with another vehicle the crash sensor/s caused this issue due to leakage to earth from dampness thus unable to read ECU. As soon as crash sensor was disconnected T4 was able to talk to the ECU

Will cost you nothing to try it.

If you have ordered another ECU you will have to recode with T4 anyway, so better try and get your original ECU working first IMO.

On the other hand last week when fault finding on a car, I found that T4 would not talk to the airbag ECU, the DDE4 ECM, and Immobiliser fitted to the car did not match the original build and. The car had to be completely reconfigured using the replacement ECU's in order to talk with the Airbag ECU. Once coded with T4 was perfect comms from then on.

[xamtex]

i tried disconnecting the crash sensors(bone dry by the way)and still no ecu read so i changed the ecu for my £8.75p ebay ecu and got a read showing 8 fault codes consistent with all the things i had not refitted...i put it all back using electric contact cleaner and cable tying all the plugs and no fault codes now and the airbag light is off.
t4???

[Eddie_P]

I have used Search to search for information on how to locate and remove the drivers side (UK ) side crash sensor as my tool is saying there is a problem with it.

Search does not bring up any information on this procedure. I find the forum quite difficult to use as a newbie. What am I doing wrong? Thanks

[SD1too]

Originally Posted by Eddie_P

I find the forum quite difficult to use as a newbie. What am I doing wrong?

Nothing Eddie. The basic forum search facility is very poor, as they are on many websites. The "Enhanced by Google" panel directly below it will give better results.

However I don't think you'll need any photographs. RAVE makes it sound straightforward:

1. Remove front seat.
2. Remove BC post lower trim finisher.
3. Remove front seat belt fixing cover.
4. Remove bolt securing front seat belt to body.
5. Release carpet from retainer.
6. Disconnect multiplug from crash sensor.
7. Remove Torx bolt securing crash sensor to body.

When refitting, the Torx bolt is tightened to 10 Nm and there must not be any gap between the component and its bracket.
The front seat belt fixing is tightened to 33 Nm.

Simon