1992 cadillac deville pcm relay center and what they control

Yes, the ECM (Engine Control Module) and the PCM (Powertrain Control Module) are the same thing. Here is a picture of the ECM for a 1992 Cadillac DeVille Sedan: https://www.1aauto.com/images/items/items/KG/KG-1369/KG-1369-A.jpg.

doing all that lacking the service manual
the manual has the correct schematics
and meter finds this easy,
is battery weak, 12.6vdc rested, 10v is dead wrong.
1992 when did it run right, last week last year, or?
which engine 3.0Liter?
is this a USA car?
the engine stuck on like that is caused by PCM relay bad.
it is stuck on.
or IGN switch bad, or its IGN pin wires shorted to hot all the time feeds. some way, like ALARM hacks do (add on struff)
the cause is ECM (ECU) is not going off line, due the power not going dead, key off.
3 causes.
bad power on relay
bad ignition switch
bad wiring on IGN1 pin of IGNition switch.

It is a known issue

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In the Engine Compartment Bussed Electrical Center It is fuse number 8. Here is a link to your owners manual, fuse info for this is on page 6-61 of the pdf file. https://my.chevrolet.com/content/dam/gmownercenter/gmna/dynamic/manuals/1998/cadillac/seville/1998_cadillac_seville_owners.pdf

It won't crank over ? Is there a SECURITY light lit on the instrument cluster .
In the under hood fuse / relay box is the start 1 relay , this relay is energized by the PCM - powertrain control module ! This is the relay that controls the starter ! If there is a anti-theft system problem the PCM will not energize the start 1 relay completing the circuit turning on the starter ! . If you knew how you could test right from the start 1 relay socket in the fuse box , rather that just replacing parts ! You can test with a DVOM -digital volt ohm meter or a test light ! Two of the four sockets have battery voltage , one should show ground an the last will show open , this is the control circuit from the PCM .

Chevy Trailblazer no crank testing and information

You need to replace the blower resistor. In should be in the blower housing under the hood.

this is caused by a defective window control switch, most likely the drivers door one.

Hi there :
hey have you taken it to autozone and had them do a free diagnostics on the car then can tell u exactly what the problem is i am suspecting a computer issue

Left Hand Side Of Engine Compartment On Relay Bracket

Hi,before you do anything, have your ignition switch checked by a pro ,this is a comon problem for GM cars,even when if sounds odd , this can save you a lot of money,