95 Camry ignition cutoff circuit?

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Old 19 Dec 2005, 03:54 pm   #1 (permalink)
Stubby
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Default 95 Camry ignition cutoff circuit?

I have a dealer installed LoJack alarm. I have figured out from poking
around with it that the car has an ignition cutoff circuit that makers
of alarm systems use. Can somebody tell me how that works?

I'm having electrical problems involving the LoJack and corroded wires.
After the car sits all night, it won't start on the first try in the
morning. I have to turn off the radio and the heater and try again.
Usually it starts right up at that point.

The LoJack stores new settings in itself when the ignition is turned
off. And after X minutes, it automatically enables the alarm system,
but I keep it in "Valet Mode" and it shouldn't do that. BUT a year ago,
the Valet Mode switch had a broken wire and it behaved strangely then.

TIA.
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Old 20 Dec 2005, 09:20 pm   #2 (permalink)
Wolfgang
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Default Re: 95 Camry ignition cutoff circuit?

LO-Jack is a hidden radio transmitter that is activated when you report your
car stolen -- Police with aid of the LO-Jack company can then track location
of your vehicle and recover it -- all guaranteed with 24 hours of being
reported. Was your install a customized one that also includes an
immobilizer alarm that's probably tigger off a current draw? When did you
have it installed --- thought they came with a 5 year warranty?

"Stubby" <William.Plummer-NO-SPAM-@alum.mit.edu> wrote in message
news:XYadnYxbSIZytjreRVn-vA@comcast.com...
>I have a dealer installed LoJack alarm. I have figured out from poking
>around with it that the car has an ignition cutoff circuit that makers of
>alarm systems use. Can somebody tell me how that works?
>
> I'm having electrical problems involving the LoJack and corroded wires.
> After the car sits all night, it won't start on the first try in the
> morning. I have to turn off the radio and the heater and try again.
> Usually it starts right up at that point.
>
> The LoJack stores new settings in itself when the ignition is turned off.
> And after X minutes, it automatically enables the alarm system, but I keep
> it in "Valet Mode" and it shouldn't do that. BUT a year ago, the Valet
> Mode switch had a broken wire and it behaved strangely then.
>
> TIA.



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Old 21 Dec 2005, 09:06 am   #3 (permalink)
Stubby
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Default Re: 95 Camry ignition cutoff circuit?

The LoJack was installed at the car dealer by a LoJack guy. It was a
very clean car with only 20K miles. But it lacked the remote door
unlock feature so they sold me a Lojack. That was fine for awhile.

Then there were many problems with the locks and with starting the car.
The dealer sold me a new alternator and several $150 service jobs,
none of which fixed the real problems.

So I decided to figure out what was wrong and pulled of the kick panel
by the driver's door. Lojack connects to three car wires near the
connector block one the door that is used for locks and windows.
Several of those connector terminals were severely corroded and crumbled
as I examined them. [I suspect the dealer used battery acid to
guarantee some future repair work!] I soldered in jumpers around the
connector for 4 signals. It has worked normally for several years, but
maybe another pin has corroded away.

In the whole process, I removed the LoJack box and wrote down the
signals and wire color codes used. I noted one was the "ignition lock
out" signal. I want to know how that works. I suspect it is a wire
that you (or a LoJack box) can ground that operates a relay that opens
the ignition key switch circuit. But that's only a guess. Can somebody
tell me?



Wolfgang wrote:
> LO-Jack is a hidden radio transmitter that is activated when you report your
> car stolen -- Police with aid of the LO-Jack company can then track location
> of your vehicle and recover it -- all guaranteed with 24 hours of being
> reported. Was your install a customized one that also includes an
> immobilizer alarm that's probably tigger off a current draw? When did you
> have it installed --- thought they came with a 5 year warranty?
>
> "Stubby" <William.Plummer-NO-SPAM-@alum.mit.edu> wrote in message
> news:XYadnYxbSIZytjreRVn-vA@comcast.com...
>
>>I have a dealer installed LoJack alarm. I have figured out from poking
>>around with it that the car has an ignition cutoff circuit that makers of
>>alarm systems use. Can somebody tell me how that works?
>>
>>I'm having electrical problems involving the LoJack and corroded wires.
>>After the car sits all night, it won't start on the first try in the
>>morning. I have to turn off the radio and the heater and try again.
>>Usually it starts right up at that point.
>>
>>The LoJack stores new settings in itself when the ignition is turned off.
>>And after X minutes, it automatically enables the alarm system, but I keep
>>it in "Valet Mode" and it shouldn't do that. BUT a year ago, the Valet
>>Mode switch had a broken wire and it behaved strangely then.
>>
>>TIA.

>
>
>

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