I'm on my phone, so unsure of your model xj. Pre-update has a habit of dirty/corroded contacts in the main connectors near the firewall/steering column. Big multi plugs. Also the connections in the back of the gauge cluster. Pull the cluster and spray contacts with cleaner and do same with the two big mofo plugs under the dash. Touch wood this is the problem.
Cheers
Sent from my FRED
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