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Hi Eightinavee, Have disconnected the headlight levelling ECU which was dry and showing no signs of corrosion, Unfortunately it has not resolved the testbook issue, so will have to resort to the wiring diagrams and start to disconnect some of the auxiliary ECU's to see if that will resolve the...

Hi Eightinavee, Thanks for the response, will check the headlight levelling ECU ( The car has the xenon lights, which initialise correctly) , I have the wiring diagrams, and have gone through the testbook diagnostic suggestions but it was all ok. We are using the later main lead with the red...

Hi, We have been chasing a fault on our L322 (horn not working) for the MOT, which has escalated into bigger problems. Originally diagnosed was the wheel slip ring as the cruise and voice control buttons have also died over a period of months. After changing the slip ring, it did not resolve the...