Mike06

Ok thanks. I will make an appt to have the car looked at by my dealer because it has to go in for a recall on the wipers anyway.

Mike Sarracino

One day I noticed that the passenger door would not unlock with the intelligent access sensor. The driver’s door worked without issue. With the truck off, battery voltage was 11.9-12.0v. Got a new battery and problem solved. Never had any warnings or notifications in the truck or on the app. Truck started without issue.

Llebaro1

I took my truck through the car wash and after drying and vacuuming the IA no longer worked and I cannot use the push to start function. No matter what I do I keep getting “no key detected”. I have to put my key in the cupholder slot to start my truck. I have changed the fob batteries with new batteries. I’ve used forscan to erase my keys and add them back. I ordered a new key and paired it and still get “no key detected”. All Fobs allow me to lock/unlock, remote start, and release the tailgate, but I cannot use IA or normal push to start.

I had the truck battery tested and it shows the battery is good. I tested for starting and it passed. It passed the alternator test as well. I’ve used forscan to see if there are any codes or abnormalities and nothing showes.

The battery truck was replaced OCT23 so I find it hard to believe it’s that, especially after passing all battery tests.

Could it still be my truck battery causing this issue?

Any help is greatly appreciated.

52merc

The Push Button Start utilizes the passive entry antennae or sensors. These sensors detect the fob when it is close to the door and allows you to unlock the door from the handle button. The sensors also detect and determine if the fob is inside the truck and allows the Push Button Start to work. It appears that you have a problem with the passive entry antenna system which is controlled by a microprocessor in the BCM. When you lock or unlock the doors with the fob, or remote start, the signal is received by the RTM and then sent on to the BCM, which controls the locks and engine starting with different microprocessors. That is why your fob will work for some features and not others. You need to scan the BCM for DTCs to see if it will indicate where the problem is with the passive entry antenna system. Often, if something trips a DTC, the module will turn off the circuit until the problem has been repaired and the DTC cleared. You need to use FORscan or a diagnostic scan tool, not an OBDII code reader.

Could be that some water from the car wash got into the BCM, or one of the passive entry antennae.

Llebaro1

thank you for the reply!

I’ve cleared any DTC’s using FORscan as that’s the only tool I have to read codes. I will try to run a manual check on the BCM and reboot it using FORscan.

I guess it’s most likely water got on one of the antennas causing issues. Any idea how to fix this issue or where the antenna are located so I can try to dry them?

52merc

The most likely culprit is in the tailgate.

Llebaro1

Could you tell me where in the tailgate the antenna is located? Or where I should start taking it apart to get to the antenna, if at all?

edit: used FORscan to check for DTC’s in the BCM. Nothing showed. I Rebooted the BCM with forscan as well and the issue persists. Hoping that replacing the keyless sensor in the the tailgate will resolve everything.

52merc

I think you should check for water in some connectors before changing out the antenna. The tailgate antenna wiring passes through connectors C316, C406 and C408 before the wiring enters the tailgate. C316 is just above DS wheel housing.



C406 and C408 are just aft of the spare tire.



The antenna is found inside the tailgate and can be accessed through the access panel.


The antenna is mounted to the release handle.

• Item 1 is the release switch
• Item 2 is the tailgate lamp
• Item 3 is the rear camera and bracket
• Item 4 is the rear entry antenna

Llebaro1

Thanks for the suggestions. I checked 406, 408, and 316. No signs of water that I can tell just lots of dust. I blew them out and reconnected them and still have the same problems with intelligent access and no key detected.

The tailgate antenna is ordered and will be trying that next.

Any other suggestions are welcome. Thanks again!

edit add: checked the BCM panel on the PS floor board no sings of water either. Looking for a fuse that maybe controls IA/push to start. Any ideas on a possible fuse that needs to be replaced?

update: checked the fuses in spots 18 and 37. They look in good condition.

52merc

As you found out, there is not a fuse dedicated to the passive entry system. You said you reset the BCM, but did you run a self-test?

Edit - It bothers me that none of the antennae appear to be working. Each antenna has its own circuit within the BCM so I would think that a single antenna failure should trip a DTC but the others should still work. Can you open the tailgate from the button? If so, the tailgate antenna is working.