Hi Yoda400,
Did you solve the issue? I have a very similar problem, my rear right indicator doesn't work for turn or hazard, left and fronts are fine. On right turn signal, front starts flashing quickly, so initially thought it was the bulb. Bulb is fine, multimeter gives low reading and swapped left and right, left always works, right never works with whatever combination of bulbs. I also checked three fuses, no. 22 on fuse box B in the engine compartment, described as "Emergency Flashers", and nos. 5 and 21 in the fuse box under the glove compartment, described as "Emergency flashers, navigation system, head up display" and "Position lights, tail lights, license plate lights, fog lights" respectively. All the fuses were fine. I can't find any others that could be related to the indicators.
I also checked the voltage on the socket leads with the turn signal on right, and it was very low, around 0.1 V or thereabouts, but my multimeter is a digital one, and I'm not sure what the lag is in reading an on-off pulse with a frequency of a 100 hz or so.
I'm really stuck and would appreciate any hints. Does anybody know where this bulb fault module that Delphius mentions is? Does the the rear light loom lead back to some accessible socket?
Many thanks for reading!