Question about 1996 Jaguar Vanden Plas

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1996 jaguar vanden plas won't start. had blown 15A CDL. dead locking fuse. still nothing. control panel lights come on with key but no starter click. checked all fuses,thinking a module may be bad? how do i check them?

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  • dspools Aug 29, 2010

    the battery is fully charged. looking for instructions on troubleshooting electrical system. with the key on there would not be power at the starter only in start position? power door locks & alarm system have not worked for many months. now lock button is lit.

  • dspools Aug 31, 2010

    Battery's fine.

    From schematics, tried testing the DAC7686 relays (blue casing...total of 4...3 in boot (red, green and yellow receptacles) and 1 in left rear heelboard (yellow receptacle)). Same results...

    Is/are one/more than one of the DAC7686 the correct relay/s? If so, which combination of the 4 should I be targeting? If not, which relay should I be targeting?

    Thanks in advance for your help.

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Usually no clicking is a bad battery or a bad starter relay.If you can jump start it,the battery is dead.If no click with a jump I would at least start by checking the relay.If you have a voltmeter or one of those light power check things(I'm not sure what they're called,I've had a meter for 20+ years).You may need to call a dealer to find out which wire should have power when key is on/off etc.Sometimes the library carries a chilton or haynes repair manual to check if you can understand a schematic.Anyhow,this is where to start before you go thinking about boards.If you need any help or have a question,just comment here and I will get an auto link.Good luck! Greg
Also,with dead/replace battery problems,a factory stereo usually locks up.You will need to ask the dealer for the code and how to unlock it if this occurrs.

Posted on Aug 30, 2010

  • Greg McCarthy Aug 31, 2010

    Sorry I couldn't get back to you sooner.I am not familiar with Jaguars but 4 relays in a starter system is not very normal.Most cars have 1 relay under the hood.Locations vary by make also obviously.Many have them,when you open the hood,look toward the firewall to the left while standing in front of the car,and is somewhere near that corner.But like I said,makers vary.I had a Buick,a Chevy and a Ford which all had them in that general area,or not very far away.Does your diagram show 1 relay between the battery and the starter?If you have a scanner,could you email me a copy of as much as possible of the system at gmccarthy86 @ hotmail .com?In the subject please write fixya because I have high security and alot of stuff ends up in junk,with fixya I'll know it's good and rarely give it out.If you can't also let me know.Thanks,Greg

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  • Master
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Check the voltage to the starter.It should show exact 12 volt with meter.The starter is connected to battery.If the connection between battery and starter is short or loose then starter will not click.Another possibility can be faulty starter solenoid ,causing this problem. There are some possibilities which you will have to check in this case:--
1) First of all check the power and voltage to the battery. With meter it will show exact 12 volt if the battery is charged. If the voltage is less get the battery charged at local auto repair shop. If the battery is internally drained and not getting charged then its time to replace the battery.
2) When you crank the car do you see spark coming at the spark plug? If no then its time to check the spark plugs and coil pack. If the spark plugs are not worn out and looks new then its time to check coil pack. The spark plug gets power to spark from coil pack.
3) The other thing to check in this case is the starter solenoid of the car. If the battery is charged and you start the car then it gives power to the starter to start the car. But if starter is faulty or not connected properly then car will not start.
4) The other thing to check in this case is fuel in the car. If there is fuel in the car then check the blockages in the fuel pump if the fuel pump looks proper then check the fuel filter above the fuel pump.
5) If all the above possibilities mentioned above checked out OK/perfect then it’s a electrical issue and the wiring's in the car needs to be checked. The car gets power from the battery to get started. so the wires from battery needs to be checked one by one.
Thanks. keep updated for any more query.you can rate this solution and show your appreciation.

Posted on Aug 29, 2010

  • raj somaiya
    raj somaiya Aug 30, 2010

    What voltage the starter is showing with car ignition turned ON.Get it checked with meter.
    Keep updated.thanks.

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