Center Brake Light Flasher Install   
Updated With Programmable Flasher
See YouTube Demo Here

You've probably seen cars that feature a flashing center brake light (got your attention didn't it?) and thought to yourself....self, I wonder if I can do that for my Avalon. Well, yes you can and it's simple once you know where the harness is. I'm going to show you that, turning my two hour search for the elusive connector into a one hour cinch with pics for you. Here we go by the numbers!

1. Order a brake light flasher. There are quite a few sold on Amazon and eBay. FastFlash I originally used the flasher shown at right.  It measures roughly 1.75 by 1.0 inches.  It worked fine flashing very rapidly half a dozen times then five slow flashes, no programming needed.  But then I found Flasher Modulesomething much better because it's less irritating to vehicles behind you in stop and go traffic.  The flasher shown at left is from a company called 3rd Brake Flasher.  It's about the size of a dime and can be programmed to flash just the way you desire.  (Hint: If you order one of these, ask for the 'older' version of the M1.  It offers more programming options.)  And then there's This other dime size module that appears to emulate the European model where flashing brake lights are governed by the braking force applied. Light pressure on the pedal, no flashing (if that's the way you program it) but increasing flash speed and numbers the harder you stop.

Once you have the module in hand you'll want to check the instructions. 

Installation Manual M1
Installation Manual Gforce
Click Above For Instructional PDFs

There are only three simple connections, one of them is ground, the others to two sides of the brake light hot wire. You might be tempted to connect to the brake light switch at the pedal. That would work and would flash 'all' of your brake lights 'but' with push button start I'm told you have to wait for the entire flash cycle before the engine will start. I didn't try it to confirm this but if true that could get old.  The programmable flashers (click for instructions at right) have two additional wires that you touch together for setup. It's very simple but don't lose the instructions in case you decide to modify your settings.  Note, some owners connect the programming wires to a push button (push-to-make) switch and place that in a spot that's easy to reach.  You'll see that option below.

So, let's do this!

2. Make Room For Daddy. Move both of your front seats to their front most position. This will give you extra room to work.
Seat Heater Connector
3. Remove The Bottom Seat Cushion. Pull 'up' on one side of the rear seat cushion. You'll feel a little pop. Move to the other side and do the same. Now, slide the cushion forward a little. If you have heated rear seats disconnect those connectors. There are two, one about in the center of each seat. (photo right)

Now you can remove the seat bottom.

Airbag PlugsConnector
4. Disconnect the air bags. Look at the lower corner of each seat back (photo left) and you'll see two connectors. Those are for the airbags. Press down on the latches to disconnect them.  A small screwdriver will help press the latch (photo right) on the bright green/yellow connector.  The white one is easy with a thumbnail.

5. Remove the seat back. Remove both headrests. Remove four 12mm bolts at the bottom of the cushions. Pull straight up on each side of the seat back. You may have to pull HARD. Get shoulder harnesses out of the way. Once free of entanglements you can remove the seatback.

6. Find Your Target Wire. On the driver's side of the rear shelf, just inboard of the outside speakerInstalled you'll see a connector with a darkNew Flasher green wire. That's the hot wire (test to confirm of course) for your center brake light and the one you'll install the module on. Cut the wire, connect your module as instructed. The photo (left) shows the original non programmable flasher.  It's well labeled in/out.  The photo (right) shows the new programmable flasher.  It's not labeled but the printed instructions are easily followed, red is in from connector, yellow is out to light, black is ground.  Solder and shrink tube the connections or use the supplied crimp connectors. Connect a black wire to ground (again, according to instructions that came with your module). Notice in both photos (all taken before tidying up)  I crimped an eyelet to the black ground wire then used a metal screw to attach it near the module.  Use small zip ties to secure wiring and make it look good.

Programming ButtonOptional: The new flasher is programmable but that doesn't do you a lot of good if you have to spend an hour removing and replacing the back seat each time so....I ran a wire down to an existing hole where the front edge of the seat bottom sits on a ledge.  The wire is connected to the blue and white wires at the module end and a push to connect button at the other.  The button is installed in that existing hole.  Now all I have to do if I want to change the programming is lift the bottom driver's side of the seat an inch and the button is right there.  Easy!  Of course, someday I'll sell the car and a new owner will find that button and wonder what the heck it's for....I'll go back and add a label.

7. Clean up your tools, making sure you don't leave anything inside the patient. This would be an excellent time to add a little extra sound deadening mat.

8. Test your work if you haven't already. Have someone step on the brake pedal while you stand back and admire your handywork. 

9. Reassemble. Put the backseat together again making sure you've replaced all four bolts for the seat back, you've connected the airbags and seat heaters (if equipped) and have your seatbelts in the proper orientation before you lock it all down.

10. DONE!


Seats Out
Seats Out....Note All The Connectors For Seat Heaters & Airbags