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Hi,
Range Rover 2004, 194,000 miles. Problem: Battery Drain together with all associated error messages.
This is a new battery and been troublshooting errors such as Air Suspension Inactive (1st) followed by Trans failsafe & DSC Inactive. Dash lights: DSC orange, Red brake light, ABS orange light.

Also new Positive & Negative cables, checked alternator output per the sticky and now get 14.2v

However, after 2 days parked in Garage, checked voltage at battery = 12.36v. Now on battery charger and after 24 plus hours, charger is full green with occasional cycling flash, indicating battery is fully charged.

Strangest thing though: I just happen to depress the hood switch when a noise appeared from inside cabin (sounds like a buzzing fan ramping up in pitch for 5 seconds then dropping off and starting up again), I presume its the climate control fan. Immediately the charger starts up a full charge cycle for a low battery and takes 10 minutes to regain a fully charged state.

Can someone please tell if its possible to stop this climate control fan as it appears to be draining the battery, even with the key out.
Thanks
 

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What may be happening is that the body control computer is sensing the open switch, and resetting the sleep mode. It is necessary to be sure that the system sees no changes before the CAN bus sends sleep commands to the modules. ANY changes will cause a reset, and the cycle has to start all over. You might try using an ammeter, and look at the current drains. One way to do this is to use the volt scales. Disconnect either the positive or negative leads, and connect the VOLT meter leads across the battery post to the lead. You should see about 12 volts until the BCM commands sleep, at which point the voltage will suddenly drop significantly. If is does not, either the sleep command is not being sent, or one of the modules is not going to sleep. It is very possible for the ventilation fan is simply responding to the BCM reset. Cycling the underhood switch can cause this. Ray
 
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