You mentioned that the bulb is OK, on the rear tail lamp. Did you check if any voltage is present at the socket when the indicator is activated? Might be as simple as possibly a blown fuse, in most cases the circuits are split. Only other idea would be the control box, where the programming takes place. Have you had any programming done to your vehicle? This would indicate to the system everything is OK and not generate a code, if for whatever reason it was coded improperly. Lets keep it simple first, check the fuse box.
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