Did some brief testing on the cabling last night. Intercepting the White & Red cable (pin 4) and Red & Light Green (pin 8) - with power off there was no resistance (connectivity) reading. Assuming that these cables connect to the speaker that would indicate that it is non-operational. With ignition on and car in reverse I was getting the odd click on a conventional 8 ohm impedence small speaker cone, and the voltage meter was indicating varying readings.
On that basis it seems to indicate that the speaker may be the cause of the problem, so I have therefore ordered one from Rimmers. Will come back when I have had a chance to lash up some cabling for it (might be two or three weeks as off on holiday very shortly); the built-in speaker seems to need most of the parcel shelf and back seats to be dismantled to get to it. Not going that route!
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