myf16 Posted July 31, 2022 Report Share Posted July 31, 2022 This is an intermittent but increasingly frequent fault on my 2009 V6 Edge. When I press on the brake pedal the brake lights do not illuminate and therefore I can't shift out of park. I'm immobilized. I replaced the brake light switch above the brake pedal and it worked for an hour or so. Now it's not working. I.e. no change. The fault still comes and goes for no known reason. Can someone point me to a wiring diagram for the brake light circuit? Maybe there's a shaky ground connection somewhere? I need to solve this immediately. Quote Link to comment Share on other sites More sharing options...
Haz Posted July 31, 2022 Report Share Posted July 31, 2022 Below are PDF download links to relevant sections of the 2009 Edge Workshop Manual... If you require specific connector details, let me know and I will provide you the information. Good luck! Turn Signal-Stop-Hazard Lamps Wiring Diagram 1 - 2009 Edge Workshop Manual.pdf Turn Signal-Stop-Hazard Lamps Wiring Diagram 2 - 2009 Edge Workshop Manual.pdf Stop Lamps Diagnosis and Testing - 2009 Edge Workshop Manual.pdf Stop Lamps Switch Removal and Installation - 2009 Edge Workshop Manual.pdf Brake-Shift Interlock Description and Operation - 2009 Edge Workshop Manual.pdf 2 Quote Link to comment Share on other sites More sharing options...
myf16 Posted July 31, 2022 Author Report Share Posted July 31, 2022 8 hours ago, Haz said: Good luck! Thanks so much for the details. My ForScanLite app gives me code C1446: Brake Switch Circuit Failure Open or Shorted to Ground. I think that means that the GEM (aka Smart Junction Box) is OK, which means I have a good chance of finding the problem. 1 Quote Link to comment Share on other sites More sharing options...
myf16 Posted July 31, 2022 Author Report Share Posted July 31, 2022 (edited) Solved. The aftermarket brake switch has a pair of black tabs which rotate 45 degrees. In one position the switch operates correctly for the Edge. Pins 1 and 4 are normally open and pins 2 and 3 are normally closed. In the other position pins 1 and 4 are not connected and pins 2 and 3 are normally open. When you install this switch in the slot and then rotate it 100 degrees or so, the switch changes to the incorrect mode! If you rotate it back 80 degrees all is well. FWIW the debug steps I1 and I2 both resulted in Yes, indicating a defective switch. However the real problem was a dual-mode part. Picture shows the black tabs in the correct position. Thanks again, @Haz. Edited August 12, 2022 by myf16 2 Quote Link to comment Share on other sites More sharing options...
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