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I'm having an issue on a 2019 GTR with the front underbody spoiler. Actuations were tested via Autel & Xentry, but all actuations failed, we replaced the motor and tried to do an initialization and that also failed. It did not give us a reason. We're looking into the AMG gateway control unit next, but we've practically wasted over a week trying to figure out this issue. The car was also not optioned with a rear-spoiler. These are the only DTC's on the car. If anyone could shed some insight into this, it would be really helpful.
what do you mean with "the car was also not optioned with a rear-spoiler"??
rear fixed spoiler should be a factory std (or at least it is for EU models)
what do you mean with "the car was also not optioned with a rear-spoiler"??
rear fixed spoiler should be a factory std (or at least it is for EU models)
Was a long day and didn't phrase it properly. Meant to say that it HAS the fixed spoiler and that it doesn't have a rear active spoiler, because a lot of people got confused by the DTC that mentions a rear spoiler actuation fault.
The spoiler started working after replacing fuses, but initialization is still failing. When doing the initialization, it does physically extend and retract fully, but it still fails. However, by the actuations tab, the spoiler only lowers and does not go back up. We did a reset of the drive unit, but it did not change anything and those codes are still present.
Edit: The initialization was successful, but the spoiler does not retract still when trying to do an actuation. I'm noticing in the actuation status that B7/1 and B7/3 are stuck at "ACTUATED" when it is lowered and no longer responding to commands until another initialization is performed.
This is more of a long shot, but it could be worth investigating..
Based on your description, the problem may be related to one of the “stop” sensors located in the wiring harness that connects the vehicle’s control unit to the front spoiler motor. (These sensors are not part of the motor assembly itself, meaning that replacing the motor alone does not provide a new harness or sensors).
If either of the two sensors fails to change state—whether due to a faulty sensor or intermittent connection—the system may register the flap as already raised. As a result, the controller will allow the flap to lower but will not command it to rise again.
Bellow is a picture of the wiring harness and the 2 sensors
These are the two power wires (Brown/Red, Red/Brown). A simple way to verify that the motor is functioning properly is to connect them to an independent 12V DC power source. By applying +12V and –12V, then reversing the polarity, you can confirm whether the flap moves up and down.
This test helps rule out the possibility of a faulty motor.
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AMG GTR Underbody Spoiler not working
