2002 Corrola SRS issue

[Xlblaze]

Hi,

My 2002 corrola has been sat unused for a couple of years, I am getting it road worth again as my wife is learning to drive.
It is one of the models that has had the airbag recall on it, the 2nd of which has not been completed yet.

When the first airbag recall was done, not long after the SRS light came on, the car spent over 6 hours in the Toyota garage and they couldn't find the issue.
I had one look, and found the airbag wire through the drives seat had snapped on the inside, i fixed that then and all was fine.

Now I have got the car out of storage, the SRS light is back on flashing, i did the usual check the connectors under the seats (there have all been changed to soldered connections but I am not sure when)

I did then get an SRS scanner that pointed me towards a short on the LH Pre-tensioner. Disconnected the tensioner, and cleared to the codes, then returned an open circuit on the pre tensioner (as expected)

I tried the resistor trick but no matter the size of the resistor i either get an open circuit (low resistance resistors) or a short (high resistance resistors).

I am at the point now where i assume its the SRS ECU that's gone, but can anyone else think of any other checks i could do before i look at replacing the SRS ECU?
What is the best option for replacing the SRS ECU? eBay?
is it just a switch out job or are they hard coded to the main ECU?

Thanks

[Red_Corolla]

Can you swap the pre-tensioners or make a connection to the right hand unit from the left hand connector? If that still produces the same fault then I would imagine you can be reasonably confident it's a problem in the loom or the module itself. Remember to disconnect the Battery before fiddling with fireworks.

[Xlblaze]

good idea, I don't thin the current loom will reach but i can remove remove on of the pretensioners and try it on the other side, and see what codes that brings up.

And then I can try check continuity through the loom.

[Xlblaze]

😞 I switched the P/T same issue, so its not the P/T
I also tested the loom, and no sign of a short.
I followed the corolla diagnostics guide and I believe its an SRS ECU Module at fault now.

Trying to find a replacement ECU is more difficult that I would like, it is model 89170-02180.

I found a similar one 89170-13060, and fitting that worked 'ish'
The fault i am seeing on mine is gone, but that module is looking for rear P/Ts which mine isn't and is also showing an issue with both side sensors (so I assume is looking for different outputs)

Anyone know where i can source a replacement 89170-02180 SRS ECU? or if in any of the repair services may be able to fix this issue?