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Strange one here. Bought the car with no comms over the p-bus. Tracked it down to a abs module (common issue on the engine). Replaced and programmed, started straight up and all seemed fine.
Came back to the car a few days later and turned it on, no engine light came on with the ignition and no crank. No fault codes other than ecm missing on bus. Wiggled and jiggled everything to no avail. After following a diag guide on the saab wis I discovered that if you turn the ignition on, removed the starter relay, bridge it so it quickly turns over (won't start yet) and remove the bridge then engine light comes on and the car will start as normal. Turn it off for any longer than 1 min and there's no engine light again until you do the same thing. Turning the key doesn't send a crank signal to the starter relay and there's no engine light up until you manually bridge it, crank the starter momentarily, then the engine light will illuminate and turning the key sends the crank signal to the relay and all is well.
Thought it may be an underhood electrical centre issue (fuse box) so I replaced and programmed it but it made no difference, same thing is happening.....any help would be appreciated
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