ongoing discharge of battery - Page 3

marinabrian · 25th September 2017, 19:56

Ray, without opening the car, peer inside and see if the light switch module is illuminated with the car locked.

I had to replace the LSM on my own ZT for this exact fault, and it's not uncommon either

If the LSM is defective, it will not allow the BCU to enter "sleep mode" meaning instead of a quiescent current of around 45mA, you will see a 1.5 to 2 amp current draw at all times

An easy and non intrusive test, with no tools required other than a dark night

Brian

SD1too · 25th September 2017, 19:59

Quote:

Originally Posted by RayWilliams

How do I contact cb750chris?

Click on 'Members list' at the top of this page.
Click on 'Search members' and enter cb750chris.
Click on his user name.
Choose the 'Contact info' tab.
Choose a private message or an e-mail.

Simon

HarryM1BYT · 26th September 2017, 06:41

There is only one LSM, that is to the right and down, from the steering wheel, in the dash. The switch knobs are back lit and the suggestion is that if the knob illumination remains on, that the LSM could be the cause of your discharge.

You cannot simply swap the LSM in from another car, it would need to be coded with a T4 to match your car.

cb750chris · 26th September 2017, 19:07

Quote:

Originally Posted by RayWilliams

Everyone Thanks for advice to my thread. The battery has been checked by Halfords and is deemed to be ok. The battery does not discharge if disconnected. The dischage is about 1.5 aamps but fluctates which is strange to me. Charging circuit is fine approx 14.5 volts and nominal charge current of about 10amps to start and then drops, you can monitor the voltage and see the alternator working as the in line ammeter flickers slightly as the alternator momentarily witches off and then on again which is normal when charging a full battery (higher than 13 volts) I am going to try another local garage and will see how good OR bad they are. Will post my feedback.
How do I contact cb750chris?

Sent you a private message.

Thanks for the recommendation gents

marinabrian · 26th September 2017, 19:22

if you find your battery drain is down to a LSM fault in the case of your other car, then it would make sense to have it programmed with the VIN of that one rather than gathering dust in the garage

I didn't get your follow up PM by the way

Brian

COLVERT · 27th September 2017, 15:49

If anybody wants a pic of the LSM, here you go.

HarryM1BYT · 27th September 2017, 19:40

I think Brian was suggesting that the switches of the LSM, the back lighting which lights up the knobs - will remain lit up (plus maybe other knob back lights), if they have the same fault.

26th September 2017, 06:41	#23
HarryM1BYT This is my second home 75 Contemporary SE Mk II 2004 Man. Sal. CDTi 135ps, FBH on red diesel, WinCE6 DD Join Date: May 2010 Location: Leeds Posts: 17,273 Thanks: 2,160 Thanked 2,061 Times in 1,586 Posts	There is only one LSM, that is to the right and down, from the steering wheel, in the dash. The switch knobs are back lit and the suggestion is that if the knob illumination remains on, that the LSM could be the cause of your discharge. You cannot simply swap the LSM in from another car, it would need to be coded with a T4 to match your car. __________________ Harry How To's and items I offer for free, or just to cover the cost of my expenses... http://www.the75andztclub.co.uk/foru...40#post1764540 Fix a poor handbrake; DIY ABS diagnostic unit; Loan of the spanner needed to change the CDT belts; free OBD diagnostics +MAF; Correct Bosch MAF cheap; DVB-T install in an ex-hi-line system; DD install with a HK amp; FBH servicing. I've taken a vow of poverty. To annoy me, send money.

27th September 2017, 19:40	#27
HarryM1BYT This is my second home 75 Contemporary SE Mk II 2004 Man. Sal. CDTi 135ps, FBH on red diesel, WinCE6 DD Join Date: May 2010 Location: Leeds Posts: 17,273 Thanks: 2,160 Thanked 2,061 Times in 1,586 Posts	I think Brian was suggesting that the switches of the LSM, the back lighting which lights up the knobs - will remain lit up (plus maybe other knob back lights), if they have the same fault. __________________ Harry How To's and items I offer for free, or just to cover the cost of my expenses... http://www.the75andztclub.co.uk/foru...40#post1764540 Fix a poor handbrake; DIY ABS diagnostic unit; Loan of the spanner needed to change the CDT belts; free OBD diagnostics +MAF; Correct Bosch MAF cheap; DVB-T install in an ex-hi-line system; DD install with a HK amp; FBH servicing. I've taken a vow of poverty. To annoy me, send money.

25th September 2017, 19:56	#21
marinabrian MG ZT Join Date: Jan 2011 Location: Newcastle Upon Tyne Posts: 20,151 Thanks: 3,565 Thanked 10,837 Times in 5,718 Posts	Ray, without opening the car, peer inside and see if the light switch module is illuminated with the car locked. I had to replace the LSM on my own ZT for this exact fault, and it's not uncommon either If the LSM is defective, it will not allow the BCU to enter "sleep mode" meaning instead of a quiescent current of around 45mA, you will see a 1.5 to 2 amp current draw at all times An easy and non intrusive test, with no tools required other than a dark night Brian

26th September 2017, 19:22	#25
marinabrian MG ZT Join Date: Jan 2011 Location: Newcastle Upon Tyne Posts: 20,151 Thanks: 3,565 Thanked 10,837 Times in 5,718 Posts	if you find your battery drain is down to a LSM fault in the case of your other car, then it would make sense to have it programmed with the VIN of that one rather than gathering dust in the garage I didn't get your follow up PM by the way Brian