Question about Cars & Trucks

Open Question

1986 Cadillac Deville Digital Cluster

Hello! I have been reading a lot of posts about the BCM and what its functions are. I have a problem with my digital cluster on my 1986 Cadillac Sedan Deville 4.1. The digital dash will not opperate as it should. I do not have speedometer, mileage or trip. I do have all of the climate control functions and everything works as it should. I do not have any codes other that a persistant Coolant Fan Temp light that clicks where the BCM is behind the glove box and then does not come on. Sometimes the fans will work, sometimes they will not. question is about the digital dash. Sometimes all of the lights light up on the digital display and then sometimes I see a 7888 where the mileage is and nothing else. I need to know if it's the digtial cluster that is bad, or the possible BCM. If it is the BCM, can I use a salvaged part from the bone yard with just plug and go or do I need to have something reprogrammed?

Posted by on


6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017

  • 373 Answers

SOURCE: digital speedometer is not working on 1990 cadillac brougham

the digital and the analog work on the same cable check the cable from the transmission

Posted on Sep 23, 2012

  • 1 Answer

SOURCE: 1989 cadillac fleetwood digital dash flashes

You have an ECM and a BCM, one located behind your glove box and the other underneath your passenger side dash. They are very similar in size, shape, and color but i think the ECM s behind the glove box. I had the same problem and replaced the one behind the glove box and the problem went away. They are both easy to replace but they cost around $70 if I remember correctly. And you have a chip you have to swap from the old to the new that you have to be careful with.

Posted on Mar 03, 2009

  • 2019 Answers

SOURCE: On a 1991 Cadillac Deville, the digital display on

Flickering is not good, and indicates a deteriorating connection of some sort.
The problem is deciding if it is in external power and ground to the dash, or internal to some chip.
Clean all the connections.
Start with the battery terminals, they should be brushed shiny and then greased.
Make sure the engine ground strap and alternator connections are cleaned and greased.
Clean and check the fuses as well, with a test light, because you can't see corrosion enough to reduce current.
It would also be useful to put a voltmeter across the battery and ensure 12.5 volts at idle, and over 14 at high rpm, but not over 14.5 volts.
The next would be the connections to the back of the dash panel, which you reach from underneath. Remember the dash also have one or more ground connections.

If all that does not turn up anything, then I would suggest getting a salvage dash panel.

Posted on Oct 09, 2010

  • 2309 Answers

SOURCE: 98 Jeep Wrangler. All dashboard

you have lost ground to the dash and or steering column, use a ohm meter to search for open circuit

Posted on Nov 20, 2010

  • 173 Answers

SOURCE: I have a 1988 Cadillac

replace it or have it repaired.There was a place in the midwest that repaired them but i don`t remember name. Sorry

Posted on Jun 03, 2011

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

How can I relearn bcm on 2004 cadillac DeVille

Reprogram the BCM requires a scan tool and factory software.

Sep 15, 2017 | Cadillac Cars & Trucks

1 Answer

R&r fan control module 1986 cadiliac sedan deville

if u havent fixed it by now usually it the fan module behind the front left headlight to acess remoce the coolant resivor and the left side turn signl marker their are 2 7mm screw and connectors on each end but u have to remove the sensor input signal wire to se if the fans come on 1st part of the diag do not replace the bcm til u checkl it out 1st usually it is the fan maoule at fault not bcm

Oct 21, 2012 | 1986 Cadillac DeVille

1 Answer

Can a 3800 series 2 v6 replace a ht4100 v8 in a 1986 coupe deville?

Sub frame , wires, computer, BCM are all different. A 4.5 or 4.9 engine will fit if you use your intake and gaskets for a 4100.

Mar 29, 2011 | 1986 Cadillac DeVille

2 Answers

What are these codes for 92 cadillac deville ff,f40,f,e,e48,e52,ee,888,70?

Hello williamcole7: My name is Roger and I will help you. The code 888 is a test code. This tests the L e d's of the dash cluster. All segments must light so you can read all numbers. The 70 code means the system is ready and able to function. The ff code is a current BCM code and is happening at the moment. The f 40 code is a BCM history code and means it was a stored problem or something that has happened. The f 40 code is for a air mix door problem. THe BCM would set this if you had an A/C problem. The E 48 code deals with the EGR system fault. I would check for a vacuum leak at the EGR solenoid. The hose is prone to deterioration do to heat from the engine. Code E52 deal with loss of voltage. A dead battery or a disconnected battery cable will always set this code. None of these codes will keep the car from running.The repair schematics are to extensive to send in a reply. Should you need further help ao assistance I will be glad to help. Please rate the answer. Thank You for using Fix Ya. Roger

Mar 24, 2011 | 1992 Cadillac DeVille

1 Answer

Is my 1986 cadillac deville front wheel drive?

Hello krazyhot1
Yes, your 86 caddy Deville is a front wheel drive car. Hope this helps.

Dec 13, 2010 | 1986 Cadillac DeVille

1 Answer

How do you release the emergency brake on a 1986 Cadillac Deville?

It is vacuum operated and there is also a release handle,down next to the brake pedal

Your cables will be rusted and not functioning, also

May 20, 2010 | 1986 Cadillac DeVille

1 Answer

My friend has a 1991 Cadillac Deville and the digital dash went out. are there any cures for this problem.

I have a 1991 Cadillac Deville and the digital dash went out. Is this the BCM problem?

Sep 13, 2009 | 1991 Cadillac DeVille

1 Answer

1986 Cadillac Deville, Fuel Data Center & Electronic climate control panels both reading 'c' and blinking rapidly. the radio blinks rapidly as well, tried fuses, now i'm lost

If its a digital dash not that this sounds good but smack the dash right in front of the steering wheel a few times and if it clears up or makes it do other things it needs a new instrument cluster.

Mar 30, 2009 | 1986 Cadillac DeVille

2 Answers

Digital cluster not working

I had same problem with my 89 cad. deville , I changed the BCM and since then no problems and everything works great now for over a year

Dec 17, 2008 | 1989 Cadillac Sedan DeVille

1 Answer

Instrument cluster went blank

I am currently working on my 92 Deville with the same problem. I was driving along, and smelled what I felt was a smoking printed circuit board. I looked down, and the digital fuel data center and climate control panel were dark.

I have the factory shop manual, and with the aid of a meter and the manual, I traced the problem to a bad BCM. The 16v supply coming from the BCM was gone. Opened up the BCM and found an overheated transistor. I also removed the fuel data center and the Climate control panel. The fuel data center panel did not smell good. I found a shorted capacitor on the Fuel data center circuit board. I am replacing the capacitor, and will be picking up a used BCM at the boneyard tomorrow. I might also have an overheated wire in a cable that might have to be replaced. I have not gotten that far in the troubleshooting yet.

Good luck with your problem.......

Oct 01, 2008 | 1991 Cadillac DeVille

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

37 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts


Level 3 Expert

77947 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22306 Answers

Thomas Perkins
Thomas Perkins

Level 3 Expert

14405 Answers

Are you a Car and Truck Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides