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I have a 2002 ram 1500. When ignition is on brake lights

Customer Question
stay on except third cab...
I have a 2002 ram 1500. When ignition is on brake lights stay on except third cab light. All other lights work properly.When ignition is off all lights work properly. After driving a mile or so the ABS and park brake lights come on on dash. I replaced
brake light switch no change. I disconnected multi function switch no change. Replace ignition switch no change. I replaced heater core a few weeks ago so I went over all the wires and connections found nothing.
Submitted: 2 years ago.Category: Dodge
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Answered in 3 minutes by:
10/23/2015
Dodge Mechanic: Amedee, Dodge Technician replied 2 years ago
Amedee
Amedee, Dodge Technician
Category: Dodge
Satisfied Customers: 26,816
Experience: ASE certified tech advanced level specialist. Wisconsin certified emissions state inspector
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Hello and welcome! My name is ***** ***** I can assist you with your question. When did this brake light issue start to happen? Was it after the heater core replacement?

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Dodge Mechanic: Amedee, Dodge Technician replied 2 years ago

Would it be possible to get your VIN?

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Customer reply replied 2 years ago
It started several weeks after the heater core replacement. The Vin is 1B7HU18NO2J103400
Dodge Mechanic: Amedee, Dodge Technician replied 2 years ago

Thank you for that information. One minute while I pull up your vehicle.

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Dodge Mechanic: Amedee, Dodge Technician replied 2 years ago

Ok, this problem is caused by a bad integrated power distribution module, CHMSL (even though it is working) or a bad left/right tail lamp assembly. Basically, you will need to run some tests in order to see which component has gone bad. Let me explain...

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Dodge Mechanic: Amedee, Dodge Technician replied 2 years ago

The CHMSL needs to be working with the proper bulb for the instrument cluster to see the correct input from the brake switch.

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Dodge Mechanic: Amedee, Dodge Technician replied 2 years ago

You could disconnect the tail lamp assemblies and check to see if the brake light circuits are not working/getting power (using a test light or a voltmeter). If so, then one of the tail lamp assemblies is bad causing this condition.

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Dodge Mechanic: Amedee, Dodge Technician replied 2 years ago

By checking/replacing the CHMSL and then verifying that the brake light circuits going to the tail light bulbs are not working correctly, then I would suspect a bad integrated power distribution module under the hood.

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Dodge Mechanic: Amedee, Dodge Technician replied 2 years ago

That would be a last resort. I have a feeling you will find something sooner (and much more simpler) once you run these tests I have provided.

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Customer reply replied 2 years ago
Where is the CHMSL
Dodge Mechanic: Amedee, Dodge Technician replied 2 years ago

That is the Center High Mounted Stop Lamp

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Dodge Mechanic: Amedee, Dodge Technician replied 2 years ago

I am glad I can help! Please dont forget to honor your good faith deposit by rating my answer as "Excellent Service" for assisting you today.

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Dodge Mechanic: Amedee, Dodge Technician replied 2 years ago

It has been a pleasure! Please let me know if you have any further questions!

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Customer reply replied 2 years ago
The CHMSL is working properly with ignition on and off
Dodge Mechanic: Amedee, Dodge Technician replied 2 years ago

Right, I understand.

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Dodge Mechanic: Amedee, Dodge Technician replied 2 years ago

I am just telling you how the system works. It is possible that even if the CHMSL is working ok, this can still affect the other brake lights.

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Customer reply replied 2 years ago
What is involved in replacing the integrated power module. Does it need to be done by a pro?
Dodge Mechanic: Amedee, Dodge Technician replied 2 years ago

It is not hard to remove and replace. However, it may need to be configured using a factory scan tool once it is installed. So you can replace it (if needed) and then have someone configure it.. or just have the dealership install it and configure it once it is installed. Either way, as long as it is installed and configured correctly..

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Customer reply replied 2 years ago
OK thanks
Dodge Mechanic: Amedee, Dodge Technician replied 2 years ago

You are most welcome!

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Dodge Mechanic: Amedee, Dodge Technician replied 2 years ago

I am glad I can help! Please dont forget to honor your good faith deposit by rating my answer as "Excellent Service" for assisting you today

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Dodge Mechanic: Amedee, Dodge Technician replied 2 years ago

It has been a pleasure working with you. You should see the rating system towards the bottom of the page.

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Dodge Mechanic: Amedee, Dodge Technician replied 2 years ago

You should see the rating system towards the bottom of the page.

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Customer reply replied 2 years ago
It appears the the problem is not the tail lights. When you say the integrated power distribution module do you mean the front control module or the integrated power module ?
Dodge Mechanic: Amedee, Dodge Technician replied 2 years ago

Hello and sorry for the delay! I could be either. However, I was talking about the intagrated power module. You might want to replace both of them at the same time just to be on the safe side.

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Dodge Mechanic: Amedee, Dodge Technician replied 2 years ago

Hello!

It's Amedee from just answer. I am just checking in to see how things turned out and if you need further assistance. Please let me know.

Amedee

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Customer reply replied 2 years ago
I'm waiting for the fuse box and FCM. Hopefully they'll fix the problem
Dodge Mechanic: Amedee, Dodge Technician replied 2 years ago

Sounds good! Thanks for the heads up!

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Customer reply replied 2 years ago
I finally replaced the fuse box and control module but it didn't fix the problem. I can't figure why the ignition would cause the computer to think the brakes are applied and turn on the brake lights and disengage the cruise control.
Dodge Mechanic: Amedee, Dodge Technician replied 2 years ago

Hello! Can you send me your VIN so I can do some digging for you?

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Customer reply replied 2 years ago
1B7HU18NO2J103400
Dodge Mechanic: Amedee, Dodge Technician replied 2 years ago

Hello and sorry for the delay! Thank you for sending the VIN (again). Lets run this test.

Remove the fuse for the brake lights from the Integrated Power Module. Use a jumper wire to ground the White/Tan wire at the brake switch. If the rear brake lights go out, repair the Center High Mounted Stop Light (CHMSL).

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Customer reply replied 2 years ago
I did the test and there was no change. I guess I'll have to get over my stubbornness and admit defeat.
Dodge Mechanic: Amedee, Dodge Technician replied 2 years ago

Hello and sorry for the delay! Can you tell me how you did the test and what were the results?

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Customer reply replied 2 years ago
I pulled the #15 fuse and grounded the white/tan wire at the brake switch with ignition turned on. The brake lights remained on.
Dodge Mechanic: Amedee, Dodge Technician replied 2 years ago

Hello and sorry for the delay! Did you do this with the connector connected or disconnected from the brake switch? Because this will make a difference.

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Customer reply replied 2 years ago
I left it connected to the brake. I'm away for work this week and next so I won't be able to do any more work on the truck.
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Amedee
Amedee, Dodge Technician
Category: Dodge
Satisfied Customers: 26,816
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