1999 Jeep GC - Lights go on and off for no reason
09-14-2004, 08:55 PM
#11
Guest
Posts: n/a
Re: 1999 Jeep GC - Lights go on and off for no reason
the lites work off a varible resistence in the sensor and if they interduced some
more to the bcm then it thinks it's getting dark out
Mark12211 wrote:
> My girl friend's 1999 Grand Cherokee's automatic lights do the same thing.
> While you are driving they often act up, but then it got worse, and I would get
> up in the middle of the night and look out the window and the head lights would
> be on. By the time I went out to turn them off, they turned themselves off.
> We did have other lighting troubles (interior lights not working, lights on
> window buttons not working), but they seemed to have been caused by the
> automatic car starter we had put in. It appears that this type of vehicle
> needs 2 auto start modules.
>
> For now we have taken the lights off the auto position.
> We know we can bring it into the dealer, but they want to charge $80 to plug
> the Jeep into a computer.
more to the bcm then it thinks it's getting dark out
Mark12211 wrote:
> My girl friend's 1999 Grand Cherokee's automatic lights do the same thing.
> While you are driving they often act up, but then it got worse, and I would get
> up in the middle of the night and look out the window and the head lights would
> be on. By the time I went out to turn them off, they turned themselves off.
> We did have other lighting troubles (interior lights not working, lights on
> window buttons not working), but they seemed to have been caused by the
> automatic car starter we had put in. It appears that this type of vehicle
> needs 2 auto start modules.
>
> For now we have taken the lights off the auto position.
> We know we can bring it into the dealer, but they want to charge $80 to plug
> the Jeep into a computer.
09-14-2004, 08:55 PM
#12
Guest
Posts: n/a
Re: 1999 Jeep GC - Lights go on and off for no reason
the lites work off a varible resistence in the sensor and if they interduced some
more to the bcm then it thinks it's getting dark out
Mark12211 wrote:
> My girl friend's 1999 Grand Cherokee's automatic lights do the same thing.
> While you are driving they often act up, but then it got worse, and I would get
> up in the middle of the night and look out the window and the head lights would
> be on. By the time I went out to turn them off, they turned themselves off.
> We did have other lighting troubles (interior lights not working, lights on
> window buttons not working), but they seemed to have been caused by the
> automatic car starter we had put in. It appears that this type of vehicle
> needs 2 auto start modules.
>
> For now we have taken the lights off the auto position.
> We know we can bring it into the dealer, but they want to charge $80 to plug
> the Jeep into a computer.
more to the bcm then it thinks it's getting dark out
Mark12211 wrote:
> My girl friend's 1999 Grand Cherokee's automatic lights do the same thing.
> While you are driving they often act up, but then it got worse, and I would get
> up in the middle of the night and look out the window and the head lights would
> be on. By the time I went out to turn them off, they turned themselves off.
> We did have other lighting troubles (interior lights not working, lights on
> window buttons not working), but they seemed to have been caused by the
> automatic car starter we had put in. It appears that this type of vehicle
> needs 2 auto start modules.
>
> For now we have taken the lights off the auto position.
> We know we can bring it into the dealer, but they want to charge $80 to plug
> the Jeep into a computer.
09-14-2004, 08:55 PM
#13
Guest
Posts: n/a
Re: 1999 Jeep GC - Lights go on and off for no reason
the lites work off a varible resistence in the sensor and if they interduced some
more to the bcm then it thinks it's getting dark out
Mark12211 wrote:
> My girl friend's 1999 Grand Cherokee's automatic lights do the same thing.
> While you are driving they often act up, but then it got worse, and I would get
> up in the middle of the night and look out the window and the head lights would
> be on. By the time I went out to turn them off, they turned themselves off.
> We did have other lighting troubles (interior lights not working, lights on
> window buttons not working), but they seemed to have been caused by the
> automatic car starter we had put in. It appears that this type of vehicle
> needs 2 auto start modules.
>
> For now we have taken the lights off the auto position.
> We know we can bring it into the dealer, but they want to charge $80 to plug
> the Jeep into a computer.
more to the bcm then it thinks it's getting dark out
Mark12211 wrote:
> My girl friend's 1999 Grand Cherokee's automatic lights do the same thing.
> While you are driving they often act up, but then it got worse, and I would get
> up in the middle of the night and look out the window and the head lights would
> be on. By the time I went out to turn them off, they turned themselves off.
> We did have other lighting troubles (interior lights not working, lights on
> window buttons not working), but they seemed to have been caused by the
> automatic car starter we had put in. It appears that this type of vehicle
> needs 2 auto start modules.
>
> For now we have taken the lights off the auto position.
> We know we can bring it into the dealer, but they want to charge $80 to plug
> the Jeep into a computer.
09-14-2004, 10:11 PM
#14
Guest
Posts: n/a
Re: 1999 Jeep GC - Lights go on and off for no reason
mic canic did pass the time by typing:
> the lites work off a varible resistence in the sensor and if they interduced
> some more to the bcm then it thinks it's getting dark out
I have seen accumulations of crap in some. Dust buildup will tend to make
them more sensitive at dusk. But even if you covered the sensor with tape
it still wouldn't make the lamps go on unless the ignition was on.
That brings up a possibility. One of the sense wires brings a ground to the
module when the switch is in the Auto position. If someone tapped that for
a ground it could sure mess things up. One other lead senses the backup
lamps (Why, I dunno). They don't give enough detail on the ultralight module
to know what wire does what.
Of course this is all academic since the 99 wiring is probably far removed
from my 93 schematics.
The key is "aftermarket starter". I've seen lots of hack jobs pulling power
from any handy source. It needs to go back to the installer since they
caused the problem. Jeep may diagnose it but the solution could be to remove
the remote starter at your expense. (harness repair work is expensive and
quite a few shops only talk in terms of replacement harnesses)
> Mark12211 wrote:
>
>> My girl friend's 1999 Grand Cherokee's automatic lights do the same thing.
>> While you are driving they often act up, but then it got worse, and I would
>> get up in the middle of the night and look out the window and the head
>> lights would be on. By the time I went out to turn them off, they turned
>> themselves off.
>> We did have other lighting troubles (interior lights not working, lights on
>> window buttons not working), but they seemed to have been caused by the
>> automatic car starter we had put in. It appears that this type of vehicle
>> needs 2 auto start modules.
>>
>> For now we have taken the lights off the auto position.
>> We know we can bring it into the dealer, but they want to charge $80 to plug
>> the Jeep into a computer.
> the lites work off a varible resistence in the sensor and if they interduced
> some more to the bcm then it thinks it's getting dark out
I have seen accumulations of crap in some. Dust buildup will tend to make
them more sensitive at dusk. But even if you covered the sensor with tape
it still wouldn't make the lamps go on unless the ignition was on.
That brings up a possibility. One of the sense wires brings a ground to the
module when the switch is in the Auto position. If someone tapped that for
a ground it could sure mess things up. One other lead senses the backup
lamps (Why, I dunno). They don't give enough detail on the ultralight module
to know what wire does what.
Of course this is all academic since the 99 wiring is probably far removed
from my 93 schematics.
The key is "aftermarket starter". I've seen lots of hack jobs pulling power
from any handy source. It needs to go back to the installer since they
caused the problem. Jeep may diagnose it but the solution could be to remove
the remote starter at your expense. (harness repair work is expensive and
quite a few shops only talk in terms of replacement harnesses)
> Mark12211 wrote:
>
>> My girl friend's 1999 Grand Cherokee's automatic lights do the same thing.
>> While you are driving they often act up, but then it got worse, and I would
>> get up in the middle of the night and look out the window and the head
>> lights would be on. By the time I went out to turn them off, they turned
>> themselves off.
>> We did have other lighting troubles (interior lights not working, lights on
>> window buttons not working), but they seemed to have been caused by the
>> automatic car starter we had put in. It appears that this type of vehicle
>> needs 2 auto start modules.
>>
>> For now we have taken the lights off the auto position.
>> We know we can bring it into the dealer, but they want to charge $80 to plug
>> the Jeep into a computer.
09-14-2004, 10:11 PM
#15
Guest
Posts: n/a
Re: 1999 Jeep GC - Lights go on and off for no reason
mic canic did pass the time by typing:
> the lites work off a varible resistence in the sensor and if they interduced
> some more to the bcm then it thinks it's getting dark out
I have seen accumulations of crap in some. Dust buildup will tend to make
them more sensitive at dusk. But even if you covered the sensor with tape
it still wouldn't make the lamps go on unless the ignition was on.
That brings up a possibility. One of the sense wires brings a ground to the
module when the switch is in the Auto position. If someone tapped that for
a ground it could sure mess things up. One other lead senses the backup
lamps (Why, I dunno). They don't give enough detail on the ultralight module
to know what wire does what.
Of course this is all academic since the 99 wiring is probably far removed
from my 93 schematics.
The key is "aftermarket starter". I've seen lots of hack jobs pulling power
from any handy source. It needs to go back to the installer since they
caused the problem. Jeep may diagnose it but the solution could be to remove
the remote starter at your expense. (harness repair work is expensive and
quite a few shops only talk in terms of replacement harnesses)
> Mark12211 wrote:
>
>> My girl friend's 1999 Grand Cherokee's automatic lights do the same thing.
>> While you are driving they often act up, but then it got worse, and I would
>> get up in the middle of the night and look out the window and the head
>> lights would be on. By the time I went out to turn them off, they turned
>> themselves off.
>> We did have other lighting troubles (interior lights not working, lights on
>> window buttons not working), but they seemed to have been caused by the
>> automatic car starter we had put in. It appears that this type of vehicle
>> needs 2 auto start modules.
>>
>> For now we have taken the lights off the auto position.
>> We know we can bring it into the dealer, but they want to charge $80 to plug
>> the Jeep into a computer.
> the lites work off a varible resistence in the sensor and if they interduced
> some more to the bcm then it thinks it's getting dark out
I have seen accumulations of crap in some. Dust buildup will tend to make
them more sensitive at dusk. But even if you covered the sensor with tape
it still wouldn't make the lamps go on unless the ignition was on.
That brings up a possibility. One of the sense wires brings a ground to the
module when the switch is in the Auto position. If someone tapped that for
a ground it could sure mess things up. One other lead senses the backup
lamps (Why, I dunno). They don't give enough detail on the ultralight module
to know what wire does what.
Of course this is all academic since the 99 wiring is probably far removed
from my 93 schematics.
The key is "aftermarket starter". I've seen lots of hack jobs pulling power
from any handy source. It needs to go back to the installer since they
caused the problem. Jeep may diagnose it but the solution could be to remove
the remote starter at your expense. (harness repair work is expensive and
quite a few shops only talk in terms of replacement harnesses)
> Mark12211 wrote:
>
>> My girl friend's 1999 Grand Cherokee's automatic lights do the same thing.
>> While you are driving they often act up, but then it got worse, and I would
>> get up in the middle of the night and look out the window and the head
>> lights would be on. By the time I went out to turn them off, they turned
>> themselves off.
>> We did have other lighting troubles (interior lights not working, lights on
>> window buttons not working), but they seemed to have been caused by the
>> automatic car starter we had put in. It appears that this type of vehicle
>> needs 2 auto start modules.
>>
>> For now we have taken the lights off the auto position.
>> We know we can bring it into the dealer, but they want to charge $80 to plug
>> the Jeep into a computer.
09-14-2004, 10:11 PM
#16
Guest
Posts: n/a
Re: 1999 Jeep GC - Lights go on and off for no reason
mic canic did pass the time by typing:
> the lites work off a varible resistence in the sensor and if they interduced
> some more to the bcm then it thinks it's getting dark out
I have seen accumulations of crap in some. Dust buildup will tend to make
them more sensitive at dusk. But even if you covered the sensor with tape
it still wouldn't make the lamps go on unless the ignition was on.
That brings up a possibility. One of the sense wires brings a ground to the
module when the switch is in the Auto position. If someone tapped that for
a ground it could sure mess things up. One other lead senses the backup
lamps (Why, I dunno). They don't give enough detail on the ultralight module
to know what wire does what.
Of course this is all academic since the 99 wiring is probably far removed
from my 93 schematics.
The key is "aftermarket starter". I've seen lots of hack jobs pulling power
from any handy source. It needs to go back to the installer since they
caused the problem. Jeep may diagnose it but the solution could be to remove
the remote starter at your expense. (harness repair work is expensive and
quite a few shops only talk in terms of replacement harnesses)
> Mark12211 wrote:
>
>> My girl friend's 1999 Grand Cherokee's automatic lights do the same thing.
>> While you are driving they often act up, but then it got worse, and I would
>> get up in the middle of the night and look out the window and the head
>> lights would be on. By the time I went out to turn them off, they turned
>> themselves off.
>> We did have other lighting troubles (interior lights not working, lights on
>> window buttons not working), but they seemed to have been caused by the
>> automatic car starter we had put in. It appears that this type of vehicle
>> needs 2 auto start modules.
>>
>> For now we have taken the lights off the auto position.
>> We know we can bring it into the dealer, but they want to charge $80 to plug
>> the Jeep into a computer.
> the lites work off a varible resistence in the sensor and if they interduced
> some more to the bcm then it thinks it's getting dark out
I have seen accumulations of crap in some. Dust buildup will tend to make
them more sensitive at dusk. But even if you covered the sensor with tape
it still wouldn't make the lamps go on unless the ignition was on.
That brings up a possibility. One of the sense wires brings a ground to the
module when the switch is in the Auto position. If someone tapped that for
a ground it could sure mess things up. One other lead senses the backup
lamps (Why, I dunno). They don't give enough detail on the ultralight module
to know what wire does what.
Of course this is all academic since the 99 wiring is probably far removed
from my 93 schematics.
The key is "aftermarket starter". I've seen lots of hack jobs pulling power
from any handy source. It needs to go back to the installer since they
caused the problem. Jeep may diagnose it but the solution could be to remove
the remote starter at your expense. (harness repair work is expensive and
quite a few shops only talk in terms of replacement harnesses)
> Mark12211 wrote:
>
>> My girl friend's 1999 Grand Cherokee's automatic lights do the same thing.
>> While you are driving they often act up, but then it got worse, and I would
>> get up in the middle of the night and look out the window and the head
>> lights would be on. By the time I went out to turn them off, they turned
>> themselves off.
>> We did have other lighting troubles (interior lights not working, lights on
>> window buttons not working), but they seemed to have been caused by the
>> automatic car starter we had put in. It appears that this type of vehicle
>> needs 2 auto start modules.
>>
>> For now we have taken the lights off the auto position.
>> We know we can bring it into the dealer, but they want to charge $80 to plug
>> the Jeep into a computer.
09-14-2004, 10:31 PM
#17
Guest
Posts: n/a
Re: 1999 Jeep GC - Lights go on and off for no reason
OK ... I had the exact same problem on my 99 GC, I would go out to the
parking lot and my lights would be on.
The Jeep dealership replaced the headlight switch/turn signal handle/module
on steering wheel. (under warranty!!)
Good as new problem fixed.
"twiggins33" <goff88@yahoo.com> wrote in message
news:053145b1cca13f28f63a252c8fd8cc6a@localhost.ta lkaboutautos.com...
> We have a 1999 Jeep Grand Cherokee and thought we were going crazy because
> our lights go on and off. They
> don't stay on for more that 5 seconds or so. First the park lights blink
> like you are unlocking the doors and then the headlights come on. We do
> have automatic lights and we did have it set on that and have now turned
> them to off. We just did that last night so we don't know if that fixed
> the problem or not. Let me know if anyone else has encountered this
> problem and what you did to fix it.
> Thanks!
>
>
parking lot and my lights would be on.
The Jeep dealership replaced the headlight switch/turn signal handle/module
on steering wheel. (under warranty!!)
Good as new problem fixed.
"twiggins33" <goff88@yahoo.com> wrote in message
news:053145b1cca13f28f63a252c8fd8cc6a@localhost.ta lkaboutautos.com...
> We have a 1999 Jeep Grand Cherokee and thought we were going crazy because
> our lights go on and off. They
> don't stay on for more that 5 seconds or so. First the park lights blink
> like you are unlocking the doors and then the headlights come on. We do
> have automatic lights and we did have it set on that and have now turned
> them to off. We just did that last night so we don't know if that fixed
> the problem or not. Let me know if anyone else has encountered this
> problem and what you did to fix it.
> Thanks!
>
>
09-14-2004, 10:31 PM
#18
Guest
Posts: n/a
Re: 1999 Jeep GC - Lights go on and off for no reason
OK ... I had the exact same problem on my 99 GC, I would go out to the
parking lot and my lights would be on.
The Jeep dealership replaced the headlight switch/turn signal handle/module
on steering wheel. (under warranty!!)
Good as new problem fixed.
"twiggins33" <goff88@yahoo.com> wrote in message
news:053145b1cca13f28f63a252c8fd8cc6a@localhost.ta lkaboutautos.com...
> We have a 1999 Jeep Grand Cherokee and thought we were going crazy because
> our lights go on and off. They
> don't stay on for more that 5 seconds or so. First the park lights blink
> like you are unlocking the doors and then the headlights come on. We do
> have automatic lights and we did have it set on that and have now turned
> them to off. We just did that last night so we don't know if that fixed
> the problem or not. Let me know if anyone else has encountered this
> problem and what you did to fix it.
> Thanks!
>
>
parking lot and my lights would be on.
The Jeep dealership replaced the headlight switch/turn signal handle/module
on steering wheel. (under warranty!!)
Good as new problem fixed.
"twiggins33" <goff88@yahoo.com> wrote in message
news:053145b1cca13f28f63a252c8fd8cc6a@localhost.ta lkaboutautos.com...
> We have a 1999 Jeep Grand Cherokee and thought we were going crazy because
> our lights go on and off. They
> don't stay on for more that 5 seconds or so. First the park lights blink
> like you are unlocking the doors and then the headlights come on. We do
> have automatic lights and we did have it set on that and have now turned
> them to off. We just did that last night so we don't know if that fixed
> the problem or not. Let me know if anyone else has encountered this
> problem and what you did to fix it.
> Thanks!
>
>
09-14-2004, 10:31 PM
#19
Guest
Posts: n/a
Re: 1999 Jeep GC - Lights go on and off for no reason
OK ... I had the exact same problem on my 99 GC, I would go out to the
parking lot and my lights would be on.
The Jeep dealership replaced the headlight switch/turn signal handle/module
on steering wheel. (under warranty!!)
Good as new problem fixed.
"twiggins33" <goff88@yahoo.com> wrote in message
news:053145b1cca13f28f63a252c8fd8cc6a@localhost.ta lkaboutautos.com...
> We have a 1999 Jeep Grand Cherokee and thought we were going crazy because
> our lights go on and off. They
> don't stay on for more that 5 seconds or so. First the park lights blink
> like you are unlocking the doors and then the headlights come on. We do
> have automatic lights and we did have it set on that and have now turned
> them to off. We just did that last night so we don't know if that fixed
> the problem or not. Let me know if anyone else has encountered this
> problem and what you did to fix it.
> Thanks!
>
>
parking lot and my lights would be on.
The Jeep dealership replaced the headlight switch/turn signal handle/module
on steering wheel. (under warranty!!)
Good as new problem fixed.
"twiggins33" <goff88@yahoo.com> wrote in message
news:053145b1cca13f28f63a252c8fd8cc6a@localhost.ta lkaboutautos.com...
> We have a 1999 Jeep Grand Cherokee and thought we were going crazy because
> our lights go on and off. They
> don't stay on for more that 5 seconds or so. First the park lights blink
> like you are unlocking the doors and then the headlights come on. We do
> have automatic lights and we did have it set on that and have now turned
> them to off. We just did that last night so we don't know if that fixed
> the problem or not. Let me know if anyone else has encountered this
> problem and what you did to fix it.
> Thanks!
>
>
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