Question about 2001 Volvo C70

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Alarm goes off on my 1999 C70 cabriolet after approx. 20-30 minutes, or can go most of the night until the early hours of the morning

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You need to reset the alarm system with the remote(s) as per the book.(you can leave it unlocked as the car has an immobiliser and cannot be hot wired.) i leave mine unlocked all the time and just use the key to start it.how many people respond to the alarm going off??
I live in england,bad car crime area.....

Posted on May 07, 2010

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You have a short in your Electrical system where the alarm connects to your power assist system or a short in your alarm. Pull the fuse for the alarm and if the problem stops it is the alarm if it continues you will need to trace the connections and make sure they are secure and protected by taping them up.

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try this:

1. find the trunk (boot) sensor (plunger) and tape it in the down position.

2. recharge the battery.

3. close the trunk and rearm the alarm.

4. listen for the alarm to go off. if it does proceed to step 6. if not see step 5.

5. the travel is too large for this trunk sensor. must have been caused by the accident. you can build up the area with some velcro or tape where the plunger meets the metal to make the travel less, thus making the alarm system think the trunk is not opened when the trunk is closed. or this sensor was damaged by the accident which will to be replaced.

6. the trunk sensor is not the problem. untape it and proceed to the hood (bonnet) sensor. tape it down and repeat steps 1-4 for the hood sensor.

7. keep repeating on the other sensors (doors, fuel door) until you find the sensor causing the problem.

good luck

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This sometimes can also be related to the internal batteries in the alarm ECU or alarm siren module going bad. If your handy the internal batteries can be replaced without buying a new replacement unit. Otherwise, the entire module must be replaced ($$$). Lastly, you can have a Saab indy or dealer disarm the theft alarm on the vehicle. You retain your keyless operation, but the alarm is not active. This is done in the programming and adjustment menus in the TWICE unit with the Saab Tech 2 computer.
Justin Duthie
Strictly Saab
Melbourne, FL

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Hi there, I have Volvo c70 cabriolet year 1999. I got problem with this car. I parked o my garage and after 3 month I go to start the gar but I can’t star battery is fane every thing is fine but the car is not start is coming the nose to start but is not comin up. Can any one tell me what should I do for it please?

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