I cant find the turn signal flasher relay on a 87 cadillac allante

Turn Signal Lamps
The TSIG/HAZ fuse in the rear fuse block supplies battery positive voltage to the flasher module. The module is part of the hazard switch assembly. The flasher module has ground at G201. The turn signal lamps may only be activated with the ignition switch in the ON or START position. The IGN-1 fuse in the rear fuse block supplies battery positive voltage to the turn signal switch. When the turn signal switch is placed in either the left or right position, current flows from the turn signal switch assembly to the flasher module. The flasher module then sends an on-off voltage signal to either the left or right turn signals and their instrument cluster (IPC) indicator. When the hazard switch is pressed, the switch contacts are close and the turn signal/hazard flasher module hazard input is grounded. In response to this input, the turn signal/hazard flasher module supplies battery positive voltage in an on and off flashing pattern to all the turn signal lamps. This also activates both turn signal indicators. When a THEFT is occurring, the DIM grounds the turn signal/hazard flasher module hazard input. The left turn signals have ground at G401 and at G402. The right turn signals have ground at G401.

Modern vehicles don't have a flasher unit, they work from a signal from the Body Control Module. The article below is for a 1999 model and says with a picture

Okay. It is located under the dash on the driver side of the vehicle right next to the steering column.

https://www.justanswer.com/car/16er8-turn-signal-relay-located-dash.html

and

https://www.google.com/search?q=%222004+Cadillac+Deville%22.+turn+signal+flasher+location&tbm=isch&ved=2ahUKEwi-t5mAvqj2AhX-gHIEHcFLA_EQ2-cCegQIABAA&oq=%222004+Cadillac+Deville%22.+turn+signal+flasher+location&gs_lcp=CgNpbWcQAzoHCCMQ7wMQJ1CxEliGU2D8amgAcAB4AIABf4gBqAKSAQMyLjGYAQCgAQGqAQtnd3Mtd2l6LWltZ8ABAQ&sclient=img&ei=zPAfYr6hBv6BytMPwZeNiA8&bih=937&biw=1920&rlz=1C1QJDB_enCA643CA644

..

Near the steering wheel under the dash.

There is no flasher relay, the turn signal is fully synthetic and is controlled through a computer called the "BCM" The turn signal click is sent to the front speaker.

flashers and turn signals have separate flasher and separate fuse.

It should be up under the dash, usually close around the steering column. The turn signal flasher and the hazard flasher may look the same. If you turn on the hazard lights, you should be able to locate that flasher-it will be clicking, and if you hold a finger lightly on it, you can feel it working. That may help you find the turn signal flasher-often they are close together.

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http://www.autozone.com/autozone/repairinfo/componentlocations/componentLocationMain.jsp?appIdsArray=&categoryNValue=4294962916&appQId=4294962982&categoryName=Flasher

TURN SIGNAL FLASHER IS LOCATED BEHIND LEFT SIDE OF DASH, ON FUSE/RELAY BLOCK BRACKET.

Try replacing the flasher relay.

To detect this flasher; turn on the turn signal and listen for the flasher in the fuse box, with your finger on the top of the flasher relay you will be able to feel it clicking inside.