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Old June 23rd, 2009, 08:41 PM   #1
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Default 99 grand caravan se sport elec issue

My wife left her windows down about 3 weeks ago and of course it rained. The drivers side dash got soaked. Now when you start the car her headlights and running lights flash like a slow strobe but if you turn the lights on the strobe effect stops. I do not know if it is related but her cig. lighter stopped working and the 60 second headlight delay does not work anymore because even if you leave the headlights on as soon as the ignition is shut off the lights turn off.

I check the fuses and all is good. Is there a relay that may need to be replaced and are the 2 issues linked together.
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Old June 25th, 2009, 04:44 PM   #2
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Bump...anyone got any info.
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Old June 25th, 2009, 04:49 PM   #3
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Probably gonna need some sort of electrical module.

Might just need the headlamp switch?
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Old June 28th, 2009, 09:10 PM   #4
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Donít know if this will help since it may be different on a 99. On a 2000 sport the headlamps are completely controlled by the Body Control Module (BCM). The headlamp switch just sends a signal to the BCM and then the BCM turns on the relays controlling the lights. The BCM also controls the headlight time delay. The BCM is located under the dash to the left of the brake pedal, about were the fuse box used to be on old cars. You may want to check to see if its wet or if the terminals are corroded.

The 2000 service manual lists the following possible causes for the headlights randomly flashing:

1. Poor lighting circuit Z1-ground
2. High resistance in headlight circuit
3. Loose or corroded terminals or splices in circuit
4. Faulty headlamp switch
5. Faulty low beam relay or high beam relay

You can test the headlamp switch with a digital multi meter equipped with a diode test. If you want to try that I can email you a picture of the charts with the pinouts and the resistance values to test for. Again this is for a 2000 so if the 1999 is different then it is of no use to you.
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Old June 28th, 2009, 09:12 PM   #5
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Quote:
Originally Posted by Brods View Post
Donít know if this will help since it may be different on a 99. On a 2000 sport the headlamps are completely controlled by the Body Control Module (BCM). The headlamp switch just sends a signal to the BCM and then the BCM turns on the relays controlling the lights. The BCM also controls the headlight time delay. The BCM is located under the dash to the left of the brake pedal, about were the fuse box used to be on old cars. You may want to check to see if its wet or if the terminals are corroded.

The 2000 service manual lists the following possible causes for the headlights randomly flashing:

1. Poor lighting circuit Z1-ground
2. High resistance in headlight circuit
3. Loose or corroded terminals or splices in circuit
4. Faulty headlamp switch
5. Faulty low beam relay or high beam relay

You can test the headlamp switch with a digital multi meter equipped with a diode test. If you want to try that I can email you a picture of the charts with the pinouts and the resistance values to test for. Again this is for a 2000 so if the 1999 is different then it is of no use to you.


That seems to be some great info.

Do you work at a dealer?

I was wondering where you came up with that kind of info and is there a website that can be shared?
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Old June 28th, 2009, 09:20 PM   #6
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'99 is the same judging by how the wiring diagram looks.
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Old June 28th, 2009, 09:55 PM   #7
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Quote:
Originally Posted by firehawk View Post
That seems to be some great info.

Do you work at a dealer?

I was wondering where you came up with that kind of info and is there a website that can be shared?
I usually get the factory service manual for the vehicles I own. Just happen to have the manual for 2000 Grand Caravan sport.
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Old June 29th, 2009, 03:59 PM   #8
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Quote:
Originally Posted by Brods View Post
Donít know if this will help since it may be different on a 99. On a 2000 sport the headlamps are completely controlled by the Body Control Module (BCM). The headlamp switch just sends a signal to the BCM and then the BCM turns on the relays controlling the lights. The BCM also controls the headlight time delay. The BCM is located under the dash to the left of the brake pedal, about were the fuse box used to be on old cars. You may want to check to see if its wet or if the terminals are corroded.

The 2000 service manual lists the following possible causes for the headlights randomly flashing:

1. Poor lighting circuit Z1-ground
2. High resistance in headlight circuit
3. Loose or corroded terminals or splices in circuit
4. Faulty headlamp switch
5. Faulty low beam relay or high beam relay

You can test the headlamp switch with a digital multi meter equipped with a diode test. If you want to try that I can email you a picture of the charts with the pinouts and the resistance values to test for. Again this is for a 2000 so if the 1999 is different then it is of no use to you.
i must say that is some nice info. I would assume it is the same. I can hear the relay in the BCM clicking. Now to find the issue
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Old July 12th, 2009, 11:01 AM   #9
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Quote:
Originally Posted by Brods View Post
Donít know if this will help since it may be different on a 99. On a 2000 sport the headlamps are completely controlled by the Body Control Module (BCM). The headlamp switch just sends a signal to the BCM and then the BCM turns on the relays controlling the lights. The BCM also controls the headlight time delay. The BCM is located under the dash to the left of the brake pedal, about were the fuse box used to be on old cars. You may want to check to see if its wet or if the terminals are corroded.

The 2000 service manual lists the following possible causes for the headlights randomly flashing:

1. Poor lighting circuit Z1-ground
2. High resistance in headlight circuit
3. Loose or corroded terminals or splices in circuit
4. Faulty headlamp switch
5. Faulty low beam relay or high beam relay

You can test the headlamp switch with a digital multi meter equipped with a diode test. If you want to try that I can email you a picture of the charts with the pinouts and the resistance values to test for. Again this is for a 2000 so if the 1999 is different then it is of no use to you.
Got the meter, I could use the info. New to this forum, I am having a bit of trouble finding the PM or email functions...
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