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The Rear Electronic Module (REM) can be accessed through the convertible soft top well. Here are instructions for finding it:
Remove the hardtop if installed and lower the convertible top.
NOTE: The pin-type retainers are overlapped by the convertible top well cover brace and convertible top well cover.Detach the 7 convertible top well cover pin-type retainers.
To install, use new pin-type retainers.
Gently pull the two corners of the protective cover away from the top brace until the 3 pin-type retainers on each side are disengaged and position the cover aside.