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WL Caprice suspect BCM

Discussion in 'VZ Holden Commodore (2004 - 2006)' started by Adam De Gioia, Sep 29, 2019.

  1. Adam De Gioia

    Adam De Gioia New Member

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    Afternoon all.

    Got a major problem wit my WL, temp and fuel gauge no longer work, trip computer is blank, SRS and ABS lights on and keeps telling me to contact Holden. I had Supercheap do a code scan and it came back with nothing. Another scan with a Snapon scan tool that was only 6 months old kept crashing when plugged in trying to talk to the car. I am left thinking the BCM is stuffed. Anyone else had similar problems? Located Penrith in Sydney, looking for an auto electrician to look at the BCM and if it is the problem change it out for me.
    Any info would be great.
    Thanks in advance

    Adam
     
  2. Fu Manchu

    Fu Manchu Well-Known Member

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    I’d be getting the ECU and BCM off to a business that specialises in repairs to them. If they are stuffed, they can tell you. If they can be repaired, they can do that.

    Removing the computers will take 10 or 15mins. ECU is under the bonnet. BCM is up under the dash.
    Disconnect negative terminal.
    Switch on ignition (just as a precaution) and leave on for a few seconds. I put headlights on. It’s only a bullshit theory that this drains residual power. Probably does nothing but it’s quick, easy, costs nothing, makes me feel better.

    BCM
    Remove the dash side trim with the air vent for the door. Pull off the lower trim under the steering wheel. Remove the trim that covers the underneath of the dash. Unplug BCM. Unclip from the top. Remove.

    ECU
    Undo the wiring. Pull the lever up and give the the locking pins a push to get it started. Tuck them out of the way. I give them a soak with contact cleaner.
    Undo the four 10mm nuts
    Undo the 7mm bolt.

    Alternatively try find a suitable computer set on eBay or local wrecker. Swap it all over.
     
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  3. Fu Manchu

    Fu Manchu Well-Known Member

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  4. Trevor loves holden.

    Trevor loves holden. Active Member

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    Have you tested all your fuses? Is your battery good? Is your alternator ok like not overcharging? Terminals tight and clean, good earth cable and tight.
    Check to see if the plugs on the BCM are plugged in properly.
     
  5. Adam De Gioia

    Adam De Gioia New Member

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    Many thanks guys.

    I will look into it, thanks for the help
     
  6. Adam De Gioia

    Adam De Gioia New Member

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    Yer mate, tried all that. Was the 1st thing I had a look at, 1st time I hoped the multimeter lied hahaha
     

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