I had one in last week which was not switching a good earth to any of the relays in the under bonnet fuse box.
infact the fuel pump relay was brunt out. Load test the engine earth with an H7 bulb and load test the relays terminal 85 & 86 with a 5 watt and 21 watt bulb.
Mine had a corroded engine to body earth strap at n/s/f.
Solid immobiliser light normally indicates a wiring issue.
thanks
lee
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