Weird electrical issues 1991 Cutlass Supr

Oldsmobile Cutlass Supreme 1988-1991

Alarm and Keyless Entry Wiring Colors and Notes

Constant +12 Volts:
RED, RED / BLACK AND
RED / WHITE - IGNITION SWITCH HARNESS

Starter Kill:
YELLOW
IGNITION SWITCH HARNESS
   
Ignition +12 Volts:
PINK
IGNITION SWITCH HARNESS
   
Dome Lights/Superv:
WHITE (-)
DRIVER KICK PANEL OR COURTESY LIGHT
   
OEM Horn:
BLACK (-)
STEERING COLUMN HARNESS OR AT RELAY
   
Power Lock:
LIGHT BLUE
DRIVER'S KICK PANEL *
   
Power Unlock:
BLACK
DRIVER'S KICK PANEL *

* See Note Positive Pulse Door Lock Diagram.
   
Trunk Release:
BLACK
(+) AT RELEASE SWITCH
   
Alarm DOME LIGHT Input Wire:
WHITE (-)
DRIVER KICK PANEL OR COURTESY LIGHT

Remote Starter Wiring Colors and Notes

Start:
YELLOW
IGNITION SWITCH HARNESS

Ignition #1:
PINK
IGNITION SWITCH HARNESS
   
Ignition #2:
DARK BLUE/WHITE
IGNITION SWITCH HARNESS

Accessory:
ORANGE
IGNITION SWITCH HARNESS
   
Brake Light:
WHITE OR LIGHT BLUE(+)
SWITCH ON BRAKE PEDAL SUPPORT BRACKET
   
Tach Signal:
WHITE
AT ELECTRONIC IGNITION MODULE
   
Parking Lights:
BROWN
(+) AT HEADLIGHT SWITCH
   
Headlights:
YELLOW (+)
HEADLIGHT SWITCH OR BEAM SELECT SW.
   
OEM Alarm Disarm: N/A

Radio Specifications
Type : J-BODY DIN
Depth : 6 11/16"
Location : DASH
Kit : YES

Antenna Information
Type : STAND/POWER
Location : RHT FRNT FEND
Adapter : CRM8A
Radio Notes *
   
Memory : ORG
Ignition Pwr : YEL
Ground : BLK
Illumination : GRY
Dimmer : BRN
Power Ant. : PNK
Harada Part : FM-70A

Front Speakers *
Size : 3 1/2"
Location : DASH
Kit : FACTORY GRILL
RF(+) : LT.GRN
RF(-) : DK.GRN
LF(+) : TAN
LF(-) : GRY
   
Rear Speakers *
Size : 6 X 9"
Location : REAR DECK
Kit : FACTORY GRILL
RR(+) : DK.BLU
RR(-) : LT.BLU
LR(+) : BRN
LR(-) : YEL

Thanks a lot!

-------------

Hello,

I have 1991 Cutlass Supreme 4-Door.  I am having two electrical problems that I cannot figure out.

1) Only the lock function is working on my power locks.  There are two lock switches (one on the drivers front door and passenger front door) and this happens no matter which switch you use, so I know its not a broken switch.  When I hit the lock button the power locks lock all 4 doors.  When I hit the unlock button nothing happens at all.  What does this mean, and how do I fix it?

2) The up, down and left functions of my power mirrors are working fine but the right does not.  I went to the junk yard and got another switch and the right button still doesn't work.  This is the case with both the drivers and passenger side of the car.  What does this mean, and how do I fix it?

The last thing I figured I would ask while I am here is where is the flasher located?  My directionals are kind of slow so I want to replace it.  Thanks!!!

Casey

-------------

1. Sure, the switches are probably good, but don't rule it out just yet.

First, find those light blue & black wires in the driver's kick panel, and test them. Does the black unlock wire test as it should? If it doesn't, it's a bad switch, or a break in the wire somewhere. If it DOES test as it should, then the next step is to make a few tests at the factory relay pack.

The factory lock relays are somewhere around the passenger underdash area....operate the lock function and listen; that'll help you find them. Once you get at the factory relays, the thick orange should be positive, the thick black should be ground, the thin blue and black should be the lock wires off the switch, and the gray and tan are the wires that go to the lock motors. Test all of those wires for proper operation.

2. If you've already replaced the switch, and both mirrors exhibit the same problem, I'd wager it's a broken wire. Examine the wires where they go into the door through the boot; that's a common failure point.

As for the turn signal flasher, just put on the signals and listen for it. It's likely to be around the fusebox area, which is easily accessed by pulling out the glove box.