Trying to find the location of the turn signal relay on my fathers 2018 f150 and I cant find it and its driving me nuts. anyone know where it is located????????

 

Ummm, have you tried or looked in the owners manual?

Also, and out of curiosity, why do "you" need to know where it’s located.

 

You're going to be looking for a long time...

The short answer - you don't have one.

The long answer, if you REALLY want to know...

The SCCM monitors the LH steering column multifunction switch position. When the LH steering column multifunction switch is in the left or right turn position, the SCCM sends a message over the HS-CAN2 to the GWM then the GWM sends the message to the BCM over the HS-CAN1 indicating a request for the LH or RH turn signal.

When the BCM receives a request for a turn signal, the BCM supplies on/off voltage to the appropriate turn lamps. The BCM sends a turn indicator command message over the MS-CAN to the door modules for the exterior mirror turn lamps.

The timed on/off cycle for turn lamps is determined by the BCM and is set to flash approximately 70 times per minute if both the front and rear turn signal lamps operate correctly.

When equipped with LED headlamps or rear lamps, the turn lamps are Light Emitting Diodes (LEDs) and have an outage circuit that tells the BCM when the Light Emitting Diodes (LEDs) are inoperative. During normal operation, when voltage is applied to the rear turn Light Emitting Diodes (LEDs), the feedback circuit sends the same voltage back to the BCM through the outage circuit. If the Light Emitting Diodes (LEDs) are inoperative the BCM will not receive this voltage feedback through the outage circuit.

If a front or rear turn signal lamp is inoperative, the BCM fast flashes the remaining turn lamp(s) approximately 150 times per minute to indicate a bulb outage to the driver.

The LH steering column multifunction switch has 2 detents for the left turn position and 2 detents for the right turn position. When placed in the first detent and released, the corresponding turn signals flash 3 times and turn off. When the LH steering column multifunction switch is moved to the second detent, the turn signal flashes until the steering wheel is turned in the opposite direction.

Vehicles with LED headlamps utilize a ballast, mounted to each headlamp assembly, that controls the voltage to the high beam, low beam, parking and turn Light Emitting Diodes (LEDs) within the headlamp assembly and the low beam DRL function.

The BCM also provides Field Effect Transistor (FET) protection of the turn lamp output circuits. When an excessive current draw is detected, the BCM disables the affected turn lamp circuit driver.

 

+1 to PupnDuck. You can use ForScan to change the number of blinks you get on the first detent, and it may even be possible to change the blink rate. There is no blinker module to mess with.

 

+2 for PupnDuck for the Great Explanation in Forscan Programing,That why we enjoy your expertise and knowledge.

 

+3 to PupnDuck for the explanation

 

Welcome to the 21st century. Where cars haven't had blinker relay modules in a long time.... Even my 2004 Chevy Colorado had this integrated into the BCM.