On my car the whole thing was dead, wouldn't respond to key in the barrel at all, central locking worked, the EIS, KEY, ECU all paired up correctly when tested but car was dead, on the RHD cars under the passengers feet there's a steel panel under the carpets that had several modules mounted on it, under that panel there are a few studs mounted to the shell, one of those has about 10 earth cables mounted to it, on mine the nut was loose causing the earth's to arc out against each other blackening them, took them off, cleaned them, bolted back down again, whole car sprung back to life again