Calling out to all Model Y owners with HW4 that have the OEM hitch installed and the trailer lights that properly operate when connecting an accessory to the trailer electrical connector. There doesn't seem to be a comprehensive thread existing that clearly identifies the Left Hand Low Voltage Body Controller version that is installed that enables the trailer lights to operate correctly. I've seen the Tesla Service Bulletin SB-22-17-014 that identifies Model Y years 2021-2022 that requires the 1497847-10-D (for 5 seat version) Left Hand Low Voltage Body Controller that needed to replace the 1657648-02-A version that does not support tow (trailer) mode.
I have a 2023 Model Y with HW4. I have installed the OEM hitch Part # 1514757-00-G that fits the new plug connectors for the HW4 Model Y that was confirmed working when it was removed from the previous vehicle. However, the trailer lights do not operate. I have a 7 pin to 4 pin adapter with an led tester and all the lights flashed in sync with a low dim. Assuming I had some power, I plugged in my trailer with LED brake and turn signals and the only result I had was the turn signal LEDs would flash a low dim pulse no matter what input was provided with the turn signal yoke. I saw a thread where it was possible that the connector doesn't recognize LED lights, so I bought the CURT 57004 LED-Compatible 7-Way RV Blade Vehicle-Side to 4-Way Flat Trailer-Side Trailer Wiring Adapter. When I plugged that adapter to my tester and then to the LED trailer lights, I had zero power going to either the led tester nor the LED trailer lights. I will admit that I did not use a voltmeter to check the power being sent to the 7 pin connector directly or the 7 pin to 4 pin adapters, but this would indicate the proper power is just not being sent to the 7 pin connector.
I can confirm that I do have the 1657648-02-A after looking up the procedure to access the Left Hand Low Voltage Body Controller found in the SB-22-18-014 service bulletin using an inspection camera to visually see the version number. I wanted to see if the owners of Model Y with HW4 and the OEM trailer hitch lights that properly operate are able to confirm which version of the Left Hand Low Voltage Body Controller is installed in their vehicles since the service bulletin does not mention model year 2023. This would be greatly appreciated and will greatly benefit all Model Y owners with HW4 who want to install a hitch compatible with the new trailer hitch connector behind the bumper that started with HW4 Model Ys.
Thanks in advance!
I have a 2023 Model Y with HW4. I have installed the OEM hitch Part # 1514757-00-G that fits the new plug connectors for the HW4 Model Y that was confirmed working when it was removed from the previous vehicle. However, the trailer lights do not operate. I have a 7 pin to 4 pin adapter with an led tester and all the lights flashed in sync with a low dim. Assuming I had some power, I plugged in my trailer with LED brake and turn signals and the only result I had was the turn signal LEDs would flash a low dim pulse no matter what input was provided with the turn signal yoke. I saw a thread where it was possible that the connector doesn't recognize LED lights, so I bought the CURT 57004 LED-Compatible 7-Way RV Blade Vehicle-Side to 4-Way Flat Trailer-Side Trailer Wiring Adapter. When I plugged that adapter to my tester and then to the LED trailer lights, I had zero power going to either the led tester nor the LED trailer lights. I will admit that I did not use a voltmeter to check the power being sent to the 7 pin connector directly or the 7 pin to 4 pin adapters, but this would indicate the proper power is just not being sent to the 7 pin connector.
I can confirm that I do have the 1657648-02-A after looking up the procedure to access the Left Hand Low Voltage Body Controller found in the SB-22-18-014 service bulletin using an inspection camera to visually see the version number. I wanted to see if the owners of Model Y with HW4 and the OEM trailer hitch lights that properly operate are able to confirm which version of the Left Hand Low Voltage Body Controller is installed in their vehicles since the service bulletin does not mention model year 2023. This would be greatly appreciated and will greatly benefit all Model Y owners with HW4 who want to install a hitch compatible with the new trailer hitch connector behind the bumper that started with HW4 Model Ys.
Thanks in advance!