" That leaves the Brown/White stripe (NW) wire and the Black (B) wire. According to the Electrical Guide, the NW wire carries battery voltage via the TransitIsolationRelay (TIR), which is adjacent to the battery in the trunk. The B wire connects to ground below the right rear seat. So the question is, what does the EBM do with that battery voltage and ground? Surely it doesn't simply connect them together, or the 20A fuse in the TIR would blow. It appears the NW battery power is subject to a Timer circuit in the TIR - I wonder if that has something to do with it? "

See post # 4

https://www.jaguarforums.com/forum/x...bypass-179290/

Are the transit isolation relay control wires intact and you may have to revisit the ignition switch connection for warranty work