keith pilling

Thank you for the replies but despite all the problems the car still started and ran and was usable the main problem at the minute is the fact that although it turns over it will not run hence I thought it may be the immobiliser 

the only thing I did was change the two modules but it still ran but didn’t make any difference to the original faults so I put the originals back.Next morning the car had a flat Battery and after charging  the car turned over but would not start 

any ideas why

Have tried disconnecting Battery but it is still the same 

The damage wasn’t to bad I had only nicked the top of it but it resulted in two wires broken and two just caught the insulation these two were taped and the broken ones soldered back together and taped then the loom was retaped to make good 

Herbie 

thank you for replying this is an ongoing problem i have 

It all started when I was working on my car and I accidentally damaged the main wiring loom going through the bulkhead next to the brake servo.This was repaired but it left me with a number of faults, these included 

air conditioning not working

no display on LCD for a/c or mpg info but showing clock

all warning light showing on dashboard but no gear position PRND no high beam light and no temperature gauge,

all windows work with the switches on their respective doors but not from the drivers door 

the door locking button on the passenger door works but not on the drivers door 

cannot open tailgate from dash button or key fob but releasing it manually from inside boot it relocks itself electrically 

the airbag light on dashboard goes off when started but comes back on

I asked several mechanics their opinions including my local Lexus dealer and not many had any idea apart from in maybe a fuse. I have checked all the fuses i can find and all ok 

i has been to a local electronic specialist but they could not find the fault 

talking to Lexus they said that they would just have to start at the beginning and work their way through which would take time and probably be expensive so I decided to buy a a/c module an the part under the lefthand side of the dashboard which includes several fuses and three bcm’s part number 02731-0w122 just to see if it made a difference 

changing the a/c module made no difference whatsoever 

changing the fuse/bcm module also didn’t work so I changed both these modules back to the original ones and at this time apart from the original faults the car worked 

overnight for some reason the Battery went flat ,i charged it up but found that although the engine turned over it would not fire 

also I found that the key would not lock and unlock the doors so I assume that maybe it was something I did and I have caused the immobiliser to come on 

there maybe Another reason but I’m not sure what 

I have tried resetting the ecu from utube which  involves shorting no4 and 13 on the diagnostic  plug but no difference 

if you or any other Lexus club member have any ideas that I could try firstly to get the car running and maybe some pointers to fixing the rest of my problems it would be appreciated 

I have a number of electrical faults on my car. I changed the fuse/module under the left hand side of the dashboard.Now although the car turns over it will not start 

I assume it is the immobiliser that is stopping it 

Does anybody have any idea how to reset it 

can anybody tell me the location of the body control module on my 2004 rx300 

have checked under dashboard both sides and behind kick plates 

have even been to lexus Leicester and asked them but nobody seems to know were it is