SOURCE: lost of battery power 1991 seville
The first thing to check is whether the alternator is operating properly. A simple test is to start the car if you can and test the voltage across the battery. If the voltage is above the rated voltage by a couple of volts then I guess the alternator is not the problem. Keep the voltage tester connected to the battery and stop the car. If the voltage drains away below the battery rating the battery is at fault. If however the voltage is very high or low when the car is running suspect the alternator. Hope this helps.
SOURCE: courtesy lights and cigar lighters are not
the BCM controls the lights, the cigar lighter will burn out at anytime so replace the knob and element
SOURCE: Dash lights in '90 cadillac seville not working
Most likley the instrument dimmer switch and that is part of the headlight switch, try wiggling it to get them on.
SOURCE: 2001 Cadillac Seville SLS. Replaced the driver
maybe the switch is not mounted correctly or connected right.
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The liftgate lamps
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Courtesy/map lights
The courtesy lamp supply voltage circuit of the body control module (BCM) supplies battery positive voltage to the dome lamp, the liftgate lamps, and the map lamps. When any door is opened, the door jamb switch contacts close providing a door open input to the BCM. The BCM then provides a ground to the interior lamps with the switch in the AUTO position. The interior lamps receive a ground at G401 with the switch in the ON position.
Important: If the liftgate is opened after all the modules go to sleep, the dome light will not come on. The liftgate ajar switch input to the BCM will not wake up the BCM once it has gone to sleep, so the dome light will not come on. Once the BCM gets an input to wake it up, from remote keyless entry (RKE) or a door handle, the dome light will turn on when the liftgate is opened.
If the driver inadvertently leaves any interior lamp ON, the BCM will turn it OFF after a 20 minute time-out.
The courtesy lamps will turn OFF immediately if the ignition switch is turned to the ON position or approximately 20 seconds after all doors are closed.
The courtesy lamps are controlled by the body control module (BCM). Inputs from the dome lamp switch and the door ajar switches are monitored by the BCM. When a door ajar switch is closed, or the dome lamp switch is turned to the ON position, the BCM supplies the B+ for the courtesy lamps.
With out a factory Tech2 scan tool or equivalent an knowing how these systems work ,you best bet is to take your vehicle to the dealer or some other ASE certified repair shop !
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