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Corsa C BCM Layout/Relay Diagram

Discussion in 'Car Audio / Electrical / Security / Related' started by raelsbrotherjohn, Feb 20, 2010.

  1. raelsbrotherjohn

    raelsbrotherjohn New Member

    Messages:
    5
    Likes Received:
    0
    Location:
    Norwich, UK
    Hi All,

    Can anyone help me get hold of something which clearly states what each of the numbered relays shown on the diagram on the inside of the BCM cover on the Corsa C relates to? I need to identify the two relays which control the intermittent and single wipe/full wipe functions.

    Any help very much appreciated.

    Thanks.

    Steve.
  2. solorider

    solorider Well-Known Member

    Messages:
    6,379
    Likes Received:
    18
    Location:
    swindon,wilts
    all functions of the intermittent wipers are controlled by the bcm,the relays are standard 4 pin relays and there are loads on the bcm,the relay function should be on the lid of the bcm
  3. drdre20013

    drdre20013 Member

    Messages:
    847
    Likes Received:
    5
    Location:
    Swindon, United Kingdom
    Not exactly sure what your specific problem is but i seen this on another site and thought it may be of use

    Wipers don't park on intermittent. Checked the wiring / relays out. Easiest way to check this out without having to open the body control module is at the wiper motor connector where it goes onto the motor. This is a five pin connector labelled A through to E. A is the yellow wire nearest to the offside of the car, and the others follow on in order. The important one to check for self parking is pin D. This should have a permanent +12V feed. If it has, it proves the wiring and relays are OK. Next I removed the motor / linkage assembly. Once this is off the car, there are three small torx headed screws on the motor case. Remove these and carefully and evenly prise off the cover plate. There are several plastic rivets also holding this but they will release if you are careful. Inside the cover plate you will see three copper fingers. The self park circuit is controlled by the two furthest from the centre of the motor. What happens is these fingers lose their tension and don't make a reliable connection with the round disc below. You may even spot signs of arcing, (a black deposit), on the cover plate just above the outermost contact. On the circular metal disc, on the outer edge will be a notch which is infilled with a nylon piece, (you may need to clear away the grease to see fully). On our motor there was a burn mark where the contact had been arcing. Clean this away. Carefully bend the copper fingers down away from the plate so that they now make a reliable connection on the circular disc when the cover is replaced. Repack with grease and if required use a sealant such as hylomar before replacing the cover plate and the screws. Refit the motor and linkage and you should be in business!

    I cant take credit for this as said above

    Rob
  4. raelsbrotherjohn

    raelsbrotherjohn New Member

    Messages:
    5
    Likes Received:
    0
    Location:
    Norwich, UK
    Gents,

    Thanks for your replies.

    I've already removed the cover of the BCM and can see the diagram on the underside of the cover but it simply shows the layout with each relay being given a number. The problem I have is that I need to be able to relate the numbered relay to the function that each one controls. So, in my case, I need to identify which relay controls the intermittent wipe function.

    I've tried the Haynes Manual and several other sources without success. I can only assume that I've missed something blindingly obvious?

    Thanks again.

    S.
  5. raelsbrotherjohn

    raelsbrotherjohn New Member

    Messages:
    5
    Likes Received:
    0
    Location:
    Norwich, UK
    Thanks Solorider - I've replied generally below but there are a number of different types of relay in the BCM. My question is - specifically which ones? A diagram surely exists somewhere with labels for each relay.
  6. MR_TOAD

    MR_TOAD Active Member

    Messages:
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    Location:
    TOAD MAIN DEALER LEEDS
    put wipers on in termitant and feel relay for clicks when found remove relay wipers will stop
    that is your relay
    Ian
  7. murphya

    murphya New Member

    Messages:
    2
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    0
    Location:
    england
    what if there is no 12v on pin d or the lug how do u no witch relay it is then i have tested my fuses and there all ok thanks tony
  8. spike1

    spike1 New Member

    Messages:
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    0
    Location:
    Cleveland uk
    No Feed to wiper motor

    Hi

    Sorry I know this is a couple of years old , but I need help , when you said , "The important one to check for self parking is pin D. This should have a permanent +12V feed. If it has, it proves the wiring and relays are OK" .

    I dont have a feed at all to the connector , and the fuse seems to be ok , F23 , well I checked all the fuses .
    Will the permanent feed to the wiper motor go through the Body Control Unit ! .

    cheers

    spike

    Wipers don't park on intermittent. Checked the wiring / relays out. Easiest way to check this out without having to open the body control module is at the wiper motor connector where it goes onto the motor. This is a five pin connector labelled A through to E. A is the yellow wire nearest to the offside of the car, and the others follow on in order. The important one to check for self parking is pin D. This should have a permanent +12V feed. If it has, it proves the wiring and relays are OK. Next I removed the motor / linkage assembly. Once this is off the car, there are three small torx headed screws on the motor case. Remove these and carefully and evenly prise off the cover plate. There are several plastic rivets also holding this but they will release if you are careful. Inside the cover plate you will see three copper fingers. The self park circuit is controlled by the two furthest from the centre of the motor. What happens is these fingers lose their tension and don't make a reliable connection with the round disc below. You may even spot signs of arcing, (a black deposit), on the cover plate just above the outermost contact. On the circular metal disc, on the outer edge will be a notch which is infilled with a nylon piece, (you may need to clear away the grease to see fully). On our motor there was a burn mark where the contact had been arcing. Clean this away. Carefully bend the copper fingers down away from the plate so that they now make a reliable connection on the circular disc when the cover is replaced. Repack with grease and if required use a sealant such as hylomar before replacing the cover plate and the screws. Refit the motor and linkage and you should be in business!

    I cant take credit for this as said above

    Rob[/QUOTE]

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