Question about 1986 Cadillac Eldorado

Open Question

My 1986 Cadillac El Dorado the dash lights go on and off.

They might stay off for 2 seconds or 20 minutes or some form of that. The car keeps running just data doesn't register and the Ac/Heater module defaults back to econ / normal. I have changed the dash cluster, Body control module, and Engine data module.

Posted by Anonymous 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.

Posted on Jan 02, 2017

  • 1 Answer

SOURCE: my 2001 cadillac el dorado will not start dash

take it to the dealer to reprogram the key

Posted on Oct 22, 2009

  • 15 Answers

SOURCE: cadillac 2000 el dorado heater blows cold air on

those controlers are vacume controled you either have a hose with a hole in it or the heater control valve is stuck or bad look under the dash by the control and see if it is moving when switched from hot to cold if not their is a line off or a hole if all lines ok then the valve is bad probley 75.00-100.00 bucks for part or so

Posted on Apr 15, 2010

  • 834 Answers

SOURCE: I need a wiring diagram for a starter for a 1989

This is the starting circuit for that vehicle.


Posted on Jun 26, 2010

  • 10319 Answers

SOURCE: gear shifter stuck on P. Won't move, and button, 1994 El Dorado

have the shift lock interlock solenoid checked out

Posted on Jul 29, 2010

  • 17970 Answers

SOURCE: I have a 1983 Cadillac

Code 52 - ECM Memory Reset
Simply means is that at some point in time the battery was disconnected from the vehicle and power was lost to the computer. Check this procedure...
1. turn the ignition key to the ON position. Do NOT start the engine.
2. Simultaneously push the OFF and WARMER buttons on the A/C-Heater control head.
3. as soon as you see any numbers push the LO button.
4. When you see the word ECM push the HI button.
5. When you see words ECM DATA push the LO button.
6. When you see the words ECM INPUTS push the LO button.
7. When you see the words ECM OUTPUTS push the LO button.
8. When you see the words ECM OVERRIDES push the LO button.
9. When you see the words ECM CLEAR CODES push and HOLD
the HI button for 3 seconds and then release the HI
button and turn OFF the ignition switch.

This should CLEAR the code 52 from the computer and the CHECK ENGINE light(s) will NOT come back ON displaying the code 52.

Code 53 - Battery Voltage error or EGR or Pass-Key II Circuit
Warning about system over-voltage ( ECM over 17.7 volts)
- Distributor signal interrupt 1983 and later Cadillac HT4100
- Vehicle anti-theft circuit ( 5.0 L. TBI )
- EGR fault 3.8 L.

Code 51 - Calibration Error, MEM-Cal, ECM or EPROM failure
This fault code indicates that the ECM sensed a fault in the PROM.

When the PROM was initially created, a checksum number representing the total of all the cell values was also stored. The ECM uses this checksum as one way to determine if the contents of any cell has changed. A Code 51 causes the ECM to enter Back-Up mode which uses the CALPAK for default sensor values.

Code 20 - Fuel pump circuit (open)
Again, electrical ptroblem

I suggest check, re-check and test all electrical wirings that are involved with this codes, and inspect the other circuits. Its possible that your Climate Control cause this or this dont work condition was the result of this electrical problem.

Some additional details could find in this link: Malfunction-Codes-Reference

Hope helps.

Posted on May 04, 2011

Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

How do I reset the engine oil light on my 92 cadillac el dorado

put oil in you car and make sure it is full on the dipstick,if the light stays on,then the sending unit is faulty

Jul 19, 2015 | Cadillac Cars & Trucks

1 Answer

1997 cadillac air and heat not coming out new blower motor evrything under the dash is working just not getting air and heat

The problem may be in the controls on the dash, had the same problem in a 2000 El Dorado.

Jan 12, 2015 | 1997 Cadillac DeVille

1 Answer

Turns off

Change the coolant temperature sensor, the one for the computer, not the one for the dash gauge.. And scan for trouble codes.

May 24, 2013 | Cadillac Eldorado Cars & Trucks

1 Answer

What's your problem? what fuse is for power window for 1997 cadillac el dorado

Find the fuse box either under the hood or under the dashboard and pull off the cover. The fuse locations are either on the fuse plug in area or on the cover you just removed!

Dec 26, 2012 | 1997 Cadillac Eldorado

1 Answer

Have 1992 El Dorado, a/c or heater motor will not run, dash display shows working, replaced resistor, still does not work.Any suggestions?

had same thing happen on my 92 el dorado. problem is at the blower control power relay the 2 plug connectors or the connector for the blower fan. theree is a flow chart to test the voltages going to these connector in the factory shop manual, for a 92 el dorado on page 1C-17 if I remember correctly. if voltages check ok then make sure plugs are securely plugged in. if still does not work, then it's the blower control power relay. good luck!

Nov 06, 2010 | 1992 Cadillac Eldorado

3 Answers

Gear shifter stuck on P. Won't move, and button, 1994 El Dorado

have the shift lock interlock solenoid checked out

Jul 29, 2010 | 1994 Cadillac Eldorado

2 Answers

Where is the thermostat on a 1999 cadillac el dorado

northstar? is located on driverside wher the water pump is right infront of the radiator. it has 2 10mm bolts holding the thermostat in place. the engin coolant temp sensor is located on the driver side on the motor towards the fire wall

Feb 12, 2010 | 1999 Cadillac Eldorado

1 Answer

1994 Cadillac deville will start, but once key is released the car dies, No lights on dash and speedometer needle climbs then falls. You can maintain pressure on the ignition switch and the car will run...

replace the computer. 94 el dorado 94 seville 94 de ville computers are the same just make sure its the 4.9l motor u have . because the computer will make the car run real bad if u do not get the correct computer

Feb 01, 2010 | 1994 Cadillac DeVille

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

Related Topics:

26 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cadillac Experts


Level 3 Expert

75822 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8201 Answers

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

Answer questions

Manuals & User Guides