kermit_rr said:

Need to know if the faults are current or historical and not been cleared. Low battery can cause all sorts of spurious fault codes in working systems

Click to expand...

kermit_rr said:

An easy alternator check is to see if there is any AC current at the battery while it's running. Should be very low mV, anything more and you could have a faulty diode, which could cause a drain

Click to expand...

Rallymantony said:

By chance a friend has just popped in for a cuppa, plugged in his diagnostic box and its listed a HUGE number of codes.... The car has always behaved itself and other then the lock out, all electrics have been fine. One thing that stands out is the light control module, I mean there's other modules listed but the LCM stands out to me, it listed as faults on nearly or maybe every light on the car, they all work so could it be that the module is bad?? I haven't researched this yet so I may be asking a question that I will find the answer to on here......
Quick edit, I just remembered that the CD player stopped working earlier this year... Where is the LCM located? wondering if the rear corner has got damp?

Click to expand...

Datatek said:

Clear all the faults and see what comes back. The LCM is known to cause problems but if you mean the SatNav CD in the rear quarter has stopped working, that is often a sign of water ingress.

Click to expand...

Rallymantony said:

Thanks Data, I have a list of faults that flashed up after they were cleared...... Does a new/second hand LCM need coding to the car or is it plug and play do you know?..

Click to expand...

• Bonnet switch fault stoped the BCM sleeping properly on a mates L322. It can be disconnected if I remember correctly, which also means the BCM thinks it's closed & you can then diagnose the drain issue with bonnet open.
• If heater blower pack is faulty the fans will run slowly after the car is switches off.

pwood999 said:

There have been posts before about LCM fault causing Canbus issues & other ECU's to behave badly. Disconnect it forst and see if the other ECU's clear properly. Otherwise you need to work through all the faults.

L322 battery drain is often bonnet switch or heater blower resistor pack fault. Anything electrical that gets damp or water ingress can also cause issues.

• Bonnet switch fault stoped the BCM sleeping properly on a mates L322. It can be disconnected if I remember correctly, which also means the BCM thinks it's closed & you can then diagnose the drain issue with bonnet open.
• If heater blower pack is faulty the fans will run slowly after the car is switches off.

If it's not these or alternator, then you need to work through the fuses one at a time until the drain stops (letting the BCM sleep each time), until you find the culprit.

Click to expand...