V90 Mk1 help needed

[Gordon Hunter]

It's all a bit confusing! Having thought I'd found the source of the problem by pulling the large fuse number 3 in the main fuse box that seemed to suggest it was horn, starter solenoid or air pump, today I've had a look at the other fuse box behind the air filter inside the engine bay and started pulling the fuses there to see if it dropped the amps leaking from the battery.

Well, it now looks like it's fuse 6 that supplies the Gearbox control module that is causing the problems. That would explain the constant pitched hum that seems to be coming from the N/S of the gearbox sump when ignition is off. The hum stops when you pull the fuse.
My guess is that the next step would be to check and see if the corresponding relay is faulty and therefore leaving power on to something when ignition is off before replacing the module itself.
I believe that the gearbox control module is located behind a panel to the right of the steering column (UK RHD car) but having trawled the NET I still have no clue as to where its solenoid might be located.
Anyone got any clues?
Can anyone confirm my course of action?
Any help greatly appreciated.

[Laird Scooby]

Fuse #6 where?

[Gordon Hunter]

Sorry, I mentioned in the previous paragraph the other fuse box behind the air filter inside the engine bay but not an obvious link.

[Laird Scooby]

Originally Posted by Gordon Hunter

Sorry, I mentioned in the previous paragraph the other fuse box behind the air filter inside the engine bay but not an obvious link.

Have you got the P-shift lock on your car? That seems to be tied into things as well from what i can see of the diagram i linked to above. Could be it's trying to make sure it's actually in P due to a stretched cable or maladjusted linkage.

I'd also look at trying to find out if you can unplug whatever is humming and see if that gets rid of the current drain, if so then investigate further.

[jonnyf90]

Originally Posted by Gordon Hunter

A quick trawl on Google was enough to help me identify it -it's for the emission system. I'll get the car upon the ramp again tomorrow, and see if there is a relay sticking that's causing the drain or try just disconnecting it.

The "air pump" is the black thing with a shepherd's crook shaped pipe adjacent to the ABS module and coolant reservoir.
It actively pumps air into the exhaust to help with emissions for around 30 seconds after starting.

Cheers