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Yes – the dealer, or someone with diagnostic gear, needs to set it to Maintenance mode. This is essentially a super sensitive setting to ensure the vehicle sits at exactly the right height and geometry (as apposed to the allowable tolerances for heights) so the toe and align can be achieved. Without it you align and especially toe adjustments will be all out. Its not just a case of getting it to stay put - the height (and suspension geometry) must be exact to start with.
If this super sensitive mode was allowed all the time the compressor would be on the go all the time…..
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It would have been nice if there was a simple mechanical way to lock the suspension - maybe a bolt through two holes in the suspension.
However unless there is real evidence of mis-alignment then I do not touch it. In the past in my other cars more often than not when an alignment is done there is a chance it ends up worse than it started when the only reason for the alignment was the purchase of new tyres.
To set up the front suspension on my Jag a bar goes on the wishbone to a spot on the body and holds the suspension in a set position while setup is completed..
Garry
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The BBS Faultmate Extreme will put the vehicle into 'Tight Tolerance Mode ' ready for a wheel alignment. It will also allow adjustment of the programmed height settings within the allowable parameters. ( which from memory is about 25mm )
