.......a quick update on the above. The door switches are all working fine. The Relay Board in the driver's footwell is perfectly dry and everything looks 'like new'. Moved all the connectors and wiring, pushed relays and fuses, etc. but the problems still remain. It has been exceptionally cold here which may, or may not, be coincidental. The engine itself runs OK.
I can't help feeling that there must be a common factor to the symptoms - headlamps switching-on by themselves, petrol gauge reading below zero and flashing, outside temperature gauge reading 'E', MPG meter not working, engine temperature gauge not working, alarm going off, security light continuously flashing..... Could the problems relate to the Anti-theft Alarm ECU unit? Can anyone say if this unit can be opened or is sealed - I am an electronic engineer and well know that many problems are simply failed solder joints, capacitors, or high value resistors. It is a different matter however if it is a failed programmable device or trouble within a multi-layer circuit board.
I intend to look at as many of the other connectors as I can find, e.g. to the Combination Meter unit (instrument dials unit), and also at the board in the passenger's footwell. Beyond that I am getting a little stuck.
If anyone can offer any suggestions, I'd be grateful.
Headlights Staying On
in Lexus IS200 / Lexus IS300 Club
Posted