central locking gone down and bad starting help please

[captainkevey]

hi all about 2 months ago the central locking became ill working sometimes than not at all finally failing and ceased working ... also around the same time starting the van became a problem switch on turn key ...click ,,leave for a while click leave longer cross fingers start...... been doing it ever since when it starts its fine goes like the clappers and quiet also had on occasion the light thats on the dash comes on " powertrain " yellow circle with cogs on .... once or twice gone into limp mode ! more concerned about the non start aspect of course but are they all linked ? any help is appreciated

06 plate 2.2 fwd derv
regards kev

[Altransit]

First port of call in a MK7 with electrical gremlins is to check the battery, or both if you have two

[captainkevey]

Am i correct to belive that one of the batteries serves the central locking and other elecs and the big one is the starter ?

[blue estate]

Am i correct to belive that one of the batteries serves the central locking and other elecs and the big one is the starter ?

Both should be the same size , front one does every thing but start and rear does starting

[captainkevey]

update fixed the intermitent non start ..new starter motor required guys who fixed it said it was worn out and clogged up with dust of the dual mass flywheel ? still not sorted the central locking though any further comments on that issue are welcome thanks ... would a diagnostic check tell me anything about the failed central locking ?

[Altransit]

Did the batteries get tested

[captainkevey]

no but if one of the batteries is down wouldent that affect something else as well ?

[blue estate]

no but if one of the batteries is down wouldent that affect something else as well ?

Not all ways there could be enough to keep pcm going but not do door locks , and when you turn key and dash lights come on it connects the start battery in line so giving you power