Mechanics

RELAY CHATTERING

1996 Dodge Caravan

Electrical problem
1996 Dodge Caravan Two Wheel Drive 170000 miles

For the last 4 years, I would be driving down the road and a couple times per month (not predictable) would hear click-click, click-click, click-click (relay chattering) sometimes for a few seconds but there have been times it continued for several minutes. The light on the rear window defrost button would come on, I think headlights or parking lights would come on and maybe dash lights (not sure about that). Recently the symptom changed to, with the car turned off (key out of ignition) when the drivers door is opened, the parking lights and dash lights come on and stay on for about 60 seconds. The bell sounds to warn me that I have left my lights on - but the headlight/parking light control switch is in the off position. Any suggestions would be greatly appreciated
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Kpb45434
January 22, 2009.



Sounds like the Body Control Module is malfunctioning. If you have a digital multi meter we can do some tests on it and make sure. Let me know what you want to do and we will go from there.

Racefan966
Jan 23, 2009.
Sounds like BCM is a good guess. Please describe how I can test with a multi-meter. Also, I am not familiar with how to reply, so if I put my reply in the wrong place, please describe the right way to reply to postings. Thanks

Tiny
Kpb45434
Jan 23, 2009.
Ok the body control module controls the following, door chime, compass and mini trip computer, exterior lighting, door ajar, interior lighting, intermittent wipers, instrument cluster, door locks, power window, keyless entry and alarm.
It is part of the junction box and located under the left side of the instrument panel.
Now you need to disconnect the connector A in the pic included below and measure resistance on terminal number 8 (light green/red wire) to a good ground if it is 5 ohm's or better then the BCM is bad and needs replaced. Just to be sure turn on the headlights and pull the parklight relay relay number 10 in the pic below. If the headlights turn off then that ensures the BCM is bad replace it.

Here is a pic of the connectors


http://www.2carpros.com/forum/automotive_pictures/249564_Graphic_28.jpg



Here is a pic of the location of the BCM and connector


http://www.2carpros.com/forum/automotive_pictures/249564_Graphic2_3.jpg



Here is a pic of the relay that needs to pulled (parklight)


http://www.2carpros.com/forum/automotive_pictures/249564_Graphic3_1.jpg


Racefan966
Jan 24, 2009.
Amazing, once I started looking into it, most of the problems went away. So my sense is that if it isn't broken that I won't mess with it - unless there is a chance that it could fail while driving and strand me or wife or kids. What would happen if the Body Control Module fails while somebody is driving the car?

Tiny
Kpb45434
Jan 26, 2009.
As I have mentioned all that the body control module controls will quit working. Your engine will still run as it has no control over that but the list I gave you off all that it does control could quit or just some of it one can never know as it is electrical. If it is all working maybe just unpluging and pluging back in was all that was needed it may have had a bad connection some where. If you need more then you have the procedure of what to do. If you need help if it goes then let me know. Thanks.

Racefan966
Jan 27, 2009.