Question about 1986 Cadillac Eldorado

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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

6ya6ya
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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.


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Posted on Jun 26, 2010

ftw1952
  • 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

ZJLimited
  • 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

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