While washing the car today the pedant in me finally had enough of the aerial going up and down on the ignition switch instead of up and down when the radio is turned on and off.
Roger is a 1993 car (July 1993 actually) and has a factory CD changer and appropriate head. Haynes tells me that my car should have a single Light Green/Black wire going from the head to the aerial, which I believe should be hot when the radio is on.
The PO replaced the aerial and as usual it’s not an OEM unit. However, its function is per the wiring scheme that should apply to my car - i.e. it has a one wire input which when hot means the aerial is up, and vice versa. The PO had wired this into an ignition-controlled circuit so I thought it would be but a moment’s work to find the Light Green/Black wire and connect it to that instead.
An hour later I concluded that my 93 does not have the wiring Haynes describes as ‘Typical 1993 and 1994 audio system’ with respect to the aerial, it appears to have the ‘Typical 1988 to 1992’ wiring - even though it has the '93-onwards CD changer and eight speakers.
With apologies for the long preamble (I’m famous for them), here’s the meat of my question: The older scheme still has that Light Green/Black wire, going to something Haynes ambitiously calls a ‘Microprocessor (Antenna Logic)’ so if I can find that wire I can simply re-route it direct to the aerial.
Where’s this ‘Microprocessor’, then? I must have one because I’ve found the original connector for the ‘Antenna Up’ and ‘Antenna Down’ relays, and their outputs are functioning (i.e. they go hot for about 30 seconds when the radio is switched on or off). However, I can’t find the light green/black wire in the boot harness so I’m wondering if the space-age technology antenna logic computer is in the cabin somewhere.
The only other things I can do are (1) live with it - not likely (2) find a pre-93 spec OEM aerial - too pricey or (3) invent a way to convert the momentary outputs from the so-called microprocessor into a go/no-go output that suits the aerial - too silly.
Justin Hill, Surrey UK
Jaguar XJR 07/1993 “Roger”
Volvo 850 20-valve 1995 “Victor” the freebie
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