Blows new bulbs, they fail, break, and you need to buy new replacement bulbs or they fail to light up.
What issues were you having that you replace the ballast, one or both.
Are the replacement ballast made for your headlights. Any ballast wire corrosion.
Get a better OBD reader and check for CEM codes.
10/1 pin 5 and 10/2 pin 5 are 12v feed into ballast.
73/3072, 73/3073 is a branching point inside the harness not a connector.
What voltage are you getting on the Y/R, BL/Gr wires.
Check the voltage out on CEM 4/56 C1:55, 64, 73, 75.
Remove 4/56 C:1 connector, inspect for corrosion or faulty pins.
There are 2 parts pictures.
1st, Headlight active gas discharge w/#26 HCM SW
2nd, Headlight gas discharge, no SW
PDF has BiXenon info.
26 HCM reload 1.00 SW 30764881 Headlamp Control Module (HCM).
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High voltage unit (ballast)
High voltage is required to light the Bi-Xenon lamp.
A high voltage unit is connected to each Bi-Xenon lamp. This transforms 12-V voltage to the approximately 24,000 V required to light the lamp. Once the lamp is on, voltage is lowered to the approximately 100 V required to keep the lamp lit.
Each time voltage is supplied to the high voltage unit (from the Central electronic module (CEM)), 3 attempts, for 1 second, are made to light the Bi-Xenon lamp. If this voltage does not exceed 9.5 V during a time period of 200 ms, the lamp does not light. If voltage is too low, such as after a voltage-consuming cold start, the lamp does not light just because the engine is running and the alternator begins charging. A new attempt must be made to start the lamp by turning the light switch to the “0” or parking light position and then back to the low beam position.
CEM-B103C04 Left Headlamp Control. General Failure Information. System Internal Failures
CEM-B103C16 Left Headlamp Control. General Electrical Failures. Circuit voltage below threshold
CEM-B103C86 Left Headlamp Control. Bus Signal / Message Failures. Signal invalid
CEM-B103C87 Left Headlamp Control. Bus Signal / Message Failures. Missing message
CEM-B103D04 Right Headlamp Control. General Failure Information. System Internal Failures
CEM-B103D16 Right Headlamp Control. General Electrical Failures. Circuit voltage below threshold
CEM-B103D86 Right Headlamp Control. Bus Signal / Message Failures. Signal invalid
CEM-B103D87 Right Headlamp Control. Bus Signal / Message Failures. Missing message
CEM-B104154 Levelling Control. System Programming Failures. Missing calibration