[Replacement] Brake Light Switch Replacement

DailyDrivenTJ.com · Posted: Wed Apr 29, 2009 7:40 pm Post subject: Brake light switch failure.

Introduction

When I completed the installation of the ORO LiteDOTs on my Jeep, I was surprised to find the lights are not responding to the brake pedal. I was rather dumb founded but I was able to narrow down the problem to the brake light switch.

The brake light switch is a non-serviceable part that needs to be replaced because they are entirely mechanical; other than things breaking inside, there is nothing else to go bad unlike other malfunctioning sensors that can look perfectly normal.

Another surprise was that once I replaced the switch, I got my cruise control back. I was trying to find a problem with the cruise control for the longest time but I wasn't able to find the problem. I later learned the cruise control is also tied with the brake light switch that it can prevent the cruise control from engaging.

Anatomy

Here is the anatomy of the brake light switch.

<<Exterior>>
The plunger is what is actuated by the brake pedal and moves 3 switches inside of the assembly. Some are normally closed and some are normal open.

<<Interior>>
This is what looks like inside of the black(white) box. In the first picture you can see where the metal contact has broken off hindering on/off control via plunger movement. On the last picture, you can see where the metal contact arms hinge against the grooves in the plunger.

Tools and Parts Needed

Brake Light Switch (Part# 04671336 with speed control if you have cruise control option.)
Torx bits are needed to remove the kick panel (not necessary).
Click Here to Access Dash Removal Procedure.

Job Hours
<20 Minutes

Procedure

1. Right above the brake pedal behind the kick panel, you can see the brake light switch. Disconnect the harness.

2. Once the harness is removed, grab the switch assembly and rotate it counterclockwise. It should come out leaving you with the following.

3. Insert the new switch as shown; there is a small plastic insertion tab which helps you guide the switch into the metal bracket. Then rotate it clockwise until it is securely held in place.

**When you do this, you will notice that the plunger assembly is longer than your original. This is because, the plunger assembly is manufactured to accommodate manufacturing variance between Jeeps. So if it is longer, not allowing you to put the switch back in, you just kind of forcefully push in the whole assembly. The plunger will adjust its length.

4. Replace the wiring harness.

5. Check for proper working brake lights and you are done!

Disclaimer

I tried my best to document as much as possible along with pictures. I hope you find them useful. However, do use the information provided here "as-is". DailyDrivenTJ.com or the author does not warrant or assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, or process disclosed. Use the information at your own risk.