Romek 0 Report post Posted October 5, 2013 My phase 1 spider 1996 has an airbag light on which I cannot clear the fault with diagnostics. I have a replacement ECU (TRW 60625181) at hand on a repair or return basis from a fellow Alfa owner. However, I am reluctant to install the ECU as I now consider it would not cure the problem as I have identified a short circuit to chassis on the ECU diagnostic line that feeds the airbag LED in the Binnacle.(Pin 1 Binnacle to Pin 13 ECU ) Has anyone had this fault and know the cure? I have already started to strip the spider trying to trace the wiring but it is proving very elusive to find a specific connector G380 has anyone any ideas where it is ? Any help or advise would be appreciated Quote Share this post Link to post Share on other sites
Romek 0 Report post Posted October 6, 2013 Well, eventually traced the fault to a short circuit between pin 13 and 14 earth on the ECU multi pin connector . Why it failed I do not know as no signs of bent pins or signs of any carbon tracking . Does anyone know if you can obtain a new connector ( Yellow 30 Pin) or is this loom replacement? Has anyone attempted this plug repair any advice be appreciated ..... Quote Share this post Link to post Share on other sites
Smaky 73 Report post Posted October 7, 2013 Pin 13 - lt blue/white wire - goes to plug G380 under the dash where it becomes a purple/white wire and is the warning light for the airbag in the cluster. Pin 14 - Black - is earth. If you have this as a short circuit then I'd suspect the cluster to be at fault. Pin 15 - orange/lt blue also runs through plug 380, but this is the live feed for the ECU which runs through a 10A fuse in the under dash box. Quote Share this post Link to post Share on other sites
Romek 0 Report post Posted October 7, 2013 Hi Smaky The cluster has been replaced and it did not cure the problem I found that Pin 13 and 14 to be short circuit on the ECU plug and PKR from the alfaowner site suggest that the plug goes short when unplugged accidentally or on purpose This make total sense.This condition would light up the Airbag light as a default to show that the airbag ecu is inoperative. So I may have a different fault on the ECU or the plug is short circuiting intermittently! !!!!! Interesting fault Next stage get to then garage and prove the suggestion by PKR. Quote Share this post Link to post Share on other sites
Romek 0 Report post Posted October 9, 2013 You are correct pkr. The connector was taken apart and it will go short circuit pin 13/14 when unplugged.turning on the light The diagnostics show two faults Battery supply low ( Measures 12.6 volts on supply feed on pin15) Airbag Indicator light on ( reads 56ohm to earth on pin 13 when ECU connected) The binnacle has been substituted with a new one The Airbag harness was tested for continuity and the reading for pre tensioner and airbag tested OK Earth checked on the ECU wiring . Cannot find any fault. It is pointing to a duff ECU Late last night I have noticed the ABS light also not self testing.... Any body got any ideas? as I am losing the will to carry on for the moment hoping for some ideas .. Quote Share this post Link to post Share on other sites
Smaky 73 Report post Posted October 9, 2013 Check the text on your mobile Quote Share this post Link to post Share on other sites
Romek 0 Report post Posted October 10, 2013 (edited) Hi Smaky Will try the earth to check on the ECU body Did not cure will attempt at downloading new software for TRW with your help to create a test rig Edited October 14, 2013 by Romek Quote Share this post Link to post Share on other sites