The rear left signal light is not working while engaging the signal or the hazard switch. At first, the issue was intermittent and now is permanent.

The Combination Relay (201 821 00 47) was buzzing so I changed the part with a known working relay from another car.

Once the signal switch is engaged the left side blinks very fast while the right side is normal. Symptoms of a broken bulb. Switched bulbs from right side to left side and vice-versa. Left side not working but the right side is working.

When I push down the stalk on the signal switch, before it permanently engages, the left side front signal will blink fast but no rear. Once engaged fully, there will be no lights on both left front and left rear signals, then buzzing sound.

So, I'm concluding that the issue is not the relay or the bulb.

Is it the signal switch that needs replacing or something else? is there anything else I need to troubleshoot? Another Relay or Fuse? Thanks!

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200 75 W115 (Mom's)
190e 90 2.6 W201
E320 95 Wagon W124
72 BMW 3.0 CSI