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Electronic climate control power module . Don't know what relay you replaced because this vehicle has no blower motor relay .1990 Cadillac DeVille Power Module
The light being on means the system has detected a problem in one or more sensors. The vibration is the ABS modulating the brakes to prevent skidding because it has detected a wheel that is locked up. That wheel is most likely the one sensor that is giving you the error.
Ignition Coils/Modules
The electronic ignition system uses an individual ignition coil for each cylinder. There are two separate ignition module assemblies located in the camshaft cover of each cylinder bank. Each ignition module assembly contains an ignition control module and four ignition coils. Each ignition coil connects directly to a spark plug using a boot. This arrangement eliminates the need for secondary ignition wires. The ignition module assemblies receive power from a fused ignition feed. Both ignition module assemblies connect to chassis ground. A Reference Low and four ignition control (IC) circuits connect each ignition module assembly to the PCM. The PCM uses the individual IC circuits to control coil sequencing and spark timing for each ignition coil. The IC circuits transmit timing pulses from the PCM to the ignition control module to trigger the ignition coil and fire the spark plug. The PCM controls ignition system sequencing and timing events
there is a multi control module panel mounted under the rear seat they are located on the passenger side their are four or five module units mounted on the panel
The anti theft module is actually the body control module.It is located in the back of the rear seat back.You can access the module through the trunk.Just remove the cover that is behind the back of the rear seat and you will see all the modules. The body control module is on the right.You will see a cross brace that goes across the back of the seat back.the bcm is about the middle of the right top part of the brace.Hope this is helpful.Good luck.
the blower fan is controlled by a module that communicates through data control info from the control panel to the fan control module. in your case the module is attached to the fan motor as one unit. if you unplug the fan you will find three wires in the connector. two thick black and red and one thinner wire, the thin wire is data. you will need to replace the whole fan unit to fix speeds.
The BLOWER MODULE is located on the A/C EVAPORATOR housing located UNDER THE HOOD passenger side firewall. Has 2 electrical connectors. Mounted with 4 screw bolts.Hope this helps
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