Weird acting rear light…

[FLvet85]

Hello all, been searching but unable to find a specific thread of anyone else encountering this.

 

so out of no where, rear blinker acting weird when brake is applied, or lights are on, or both. 
then the surround doesn’t work and flashes instead of blinker and the blinker randomly flashes and then stops.

 

So obviously I assumed light assembly fault, decided to test that theory, swapped to working side and the assembly works, swapped the other way to test if it’s connector, low and behold doesn’t work and get the same results as said at the top.

 

tested connections with multimeter on good side(passenger), one connection has a solid unchanging voltage when lights are on (seems right) blinker on and another pin fluctuates like you’d expect for a blinker. 

 

So assumed it should match on “bad”side(driver) what should be the solid unchanging pin is fluctuating on bad side and not high enough volts to match working side, uh oh, checked blinker pin it is fluctuating like expected but also not high enough.

 

so that to me tells me there is something wrong somewhere in the wiring, so before I tear absolutely everything apart on my only vehicle, any recommendations of where to check first or loom connections and locations of where to check?

 

2016 edge sport.

 

have videos of it acting weird but hopefully I explained well enough but if not I’ll upload.

 

 

 

Edited Saturday at 05:42 PM by FLvet85
Poor English, tried to tidy up

[garycrist]

I guess a bad ground based on the voltages given. I've seen the direction indicators

on older Fords "glow dimly" with a bad ground in the hear lights or tail lights.

[Wubster100]

Turn Signal and Hazard Lamps DT.pdf Rear Lamp Assembly.pdf

[Wubster100]

Field Effect Transistor (FET) Protection

 

The BCM utilizes an Field Effect Transistor (FET) protective circuit strategy for many of its outputs, for example, lamp output circuits. Output loads (current level) are monitored for excessive current (typically short circuits) and are shut down (turns off the voltage or ground provided by the module) when a fault event is detected.

 

A Field Effect Transistor (FET) is a type of transistor that the control module software uses to control and monitor current flow on module outputs. The Field Effect Transistor (FET) protection strategy prevents module damage in the event of excessive current flow.

 

Output loads (current level) are monitored for excessive current draw (typically short circuits). When a fault event is detected the Field Effect Transistor (FET) turns off and a short circuit DTC sets. The module resets the Field Effect Transistor (FET) protection and allows the circuit to function when the fault is corrected or the ignition state is cycled off and then back on.

 

When the excessive circuit load occurs often enough, the module shuts down the output until a repair procedure is carried out. Each Field Effect Transistor (FET) protected circuit has 3 predefined levels of short circuit tolerance based on a module lifetime level of fault events based upon the durability of the Field Effect Transistor (FET). If the total tolerance level is determined to be 600 fault events, the 3 predefined levels would be 200, 400 and 600 fault events.

 

When each level is reached, the DTC associated with the short circuit sets along with DTC U1000:00. These Diagnostic Trouble Codes (DTCs) can be cleared using the module on-demand self-test, then the Clear DTC operation on the scan tool (if the on-demand test shows the fault corrected). The module never resets the fault event counter to zero and continues to advance the fault event counter as short circuit fault events occur.

 

If the number of short circuit fault events reach the third level, then Diagnostic Trouble Codes (DTCs) U1000:00 and U3000:49 set along with the associated short circuit DTC . DTC U3000:49 cannot be cleared and the module must be replaced after the repair.

[FLvet85]

Well once again @Wubster100 to the rescue, grabbing new obd cable, and we shall see whats what and how much money im going to throw at this thing.  

[Haz]

The PDF documents attached below may be useful supplements to the information @Wubster100 has shared...

 

Good luck!

 

Rear Turn Signal-Stop-Hazard Lamps, Low Series - Wiring Diagram - 2016 Edge.pdf Rear Turn Signal-Stop-Hazard Lamps, High Series - Wiring Diagram - 2016 Edge.pdf BODY CONTROL MODULE (BCM) - Connector C2280D Pinout - 2016 Eddge.pdf BODY CONTROL MODULE (BCM) - Connector C2280D Location - 2016 Eddge.pdf BODY CONTROL MODULE (BCM) - Connector Locatio Illustration - 2016 Eddge.pdf REAR LAMP ASSEMBLY LH - Connector C412 Pinout - 2016 Edge.pdf REAR LAMP ASSEMBLY RH - Connector C415 Pinout - 2016 Edge.pdf