How to change turn signal switch on 93 Buick Roadmaster

Posted by mellassi on December 2, 2014 under Domestic | Be the First to Comment

1993 Buick Roadmaster 5.7 L

Vehicle application :

1994 caprice 5.7, 1995 Monte Carlo 3.4, 1995 Cutlass supreme 3.4

turn signal switch problems:

car came with no brake lights operation. Third brake light works fine.


1-check voltage to turn signal switch on white wire when the brake pedal is depressed.

if no voltage, suspect the brake light switch.

2-with brake pedal depressed, check for voltage out of turn signal switch on the green and yellow wires.

this is the wiring diagram for brake and turn signal circuit:

brake wiring diagram 93 Buick roadmaster


1- Disconnect battery cables.

2-Remove Air bag.

3-Remove cover under dashboard.

4-Unplug turn signal switch.

5-Remove steering column (use steering column and locker plate tool).

6-Remove Airbag switch.

7-Remove Locker plate.

8-Remove turn signal switch and pull it through steering column.


To install it, reverse removal  order.

Watch this YouTube video: