BaxFromNZ

My instrument cluster has gone dead. Initially it was intermittent but now it is permanent. This is the last model LS400 with variable valve timing prior to the LS430 so the instruments include a trip computer which my previous 1996 LS400 did not have. Several kind people have sent me wiring diagrams but what I need is the circuit diagram of the actual printed circuit boards inside the cluster as the cluster is currently at an instrument repair shop and they have hit a brick wall. There is a main board and one or two daughter boards in the cluster one of which is the power supply circuit board and this is where I suspect the fault might be. If you have access to a diagram or know where I can source one I would really appreciate it. I have replaced all of the electrolytic capacitors on the main board myself but this did not fix the problem. I appreciate that Toyota do not normally release this information because they would prefer to sell me a new one but there are some clever people amongst you who may have managed to wheedle one out of the strongroom somehow!

The first thing you should probably do is check the fuse. On right hand drive cecles it is in a fuse box under the bonnet beside the left hand front wheel arch (or just behind it.) I assume left hand drive vehicles are the same. The fuse you are looking for is "Sec Horn" (which is short for security horn. Replace this first before you delve deeper. Good luck.