Re: tips on checking airbag system
Regarding the TRW unit on a facelift (4 airbag system)...
Cant remember what value resistor you use to bypass the airbag (slave) unit.
Ask your dealer - if you have a baby seat in the front, the passenger airbag is disconnected and a resistor put in place, in theory it would be the same resistance as an airbag unit.
I *think* the later TRW unit is controlled via the CAN bus, I havent had much time to work on it, still working on the KWP2000 ECU comms - in which case voltages alone won't set it off, it requires the correct 'activate' signal to be sent from the ECU to that particular unit...but all the same I wouldnt go getting too jiggy with a DVM around it..
For my ever lasting airbag problem - it was always the 2 side airbags going open circuit. There is a connector underneath each seat, consisting of 2 contacts. These are the crappest connectors I have ever seen, and god knows how they allowed them to be used on the airbag system. I stripped a piece of insulation off each wire both sides of the connectors, then hard wired (soldered) a bridging wire around the connector to the corresponding wire. Obviously insulate well, then I put a tie wrap around the connectors so they can never come apart... even if they do the extra wire should maintain the connection.
Disconnect the airbag ECU 10 mins before starting work (under the stereo - pull out the cubby hole holder then disconnect the main plug)
Disconnect the airbag fuse
Wait 10 mins
Do your stuff
DO NOT TOUCH IGNITION whilst doing this
Reconnect - then get it reset - most fuel injection specialists can reset it, to avoid paying 1 hrs labour at a dealer for a 5 min job!
The fualt codes are written to an EEPROM or a PROC , so disconnecting the power wont do FA. The system needs to be sorted, then the error codes cleared, then let it check again.. see if they return.
Websites are like ********s, everyone has one, and im wary of any bloke trying to direct people into their's