SRS system wiring diagrams in workshop manuals?

[jonhahn99]

I have a 1995 911 that's had its SRS light come on for more than a year now. It came on, I believe, at a track event in 2006 (or maybe late 2005), and at the end of 2006 I had the system diagnosed, both with Durametric sofware and even an original Bosch hammer, I believe. The recommendation, as there were tons of faults, was to replace the central control unit, under the passenger side dash. Well, I've done that, but no change in error status (and, as before, resetting the light will not work). For fun, I also re-soldered the connections on the back of my clock (a 964 trick) and that had no effect.

It's clear now that this will be a real PITA to fix (I pasted codes, etc. below) so I'm hoping I can get a copy of the wiring diagrams for this car, and step-by-step go through and check the grounds and connectors, with the hope that I just find some frayed wiring or disconnected ground... rather than throwing more expensive, un-returnable electrical parts at the problem...

Thanks for any help you can provide.

Jon

Codes read:

> > > 17 Crash sensor left side contact resistance vs battery voltage

> > > 0 internal fault code

> > > 144 internal fault code

> > > 0 internal fault code

> > > 251 internal fault code

> > > 128 internal fault code

> > > 4 Firing circuit driver

> > > 225 internal fault code

> > > 43 Ignition Pill Circuit 1 contact resistance vs ground

> > > 1 Warning Light for Airbag

[wvicary]

After you replaced the control module did you use the bosch hammer or durametric software to recheck the codes if any?

[Richard Hamilton]

Were you able to code/lock the new control module with a Hammer or PST2? The unit has to be locked or the abs light will continue to come on.

[jonhahn99]

Richard, I did not "code" or "unlock" anything - the local mechanic I used just simply tried to reset the SRS light after we connected up the new module. We were attempting to use durametric software to perform this reset.

The codes were similar before the change-out of the module and after; the SRS light refused to reset in any situation, with the old central module or the new one.

Is what you're saying that one can't reprogram the SRS system on a 1995 911 (993) without a Bosch Hammer? (PS - my local dealer refused to work on the car, "it's too old." [the OBD1 thing scared them off, I think.]

[Richard Hamilton]

According to the manual, the new control module is supplied in an 'unlocked' condition, and it has to be 'locked' before it will work. Once locked, it cannot be unlocked. You need a Hammer, PST2, or PIWIS to lock the unit. I'll try to extract the info from the manual and PM you.