Invalid Data Received From Headlamp Control Module B

Where it lives

For U0543, the part to look at first is the module named here.

Check these first

• A low battery or charging fault that browns out the headlamp control module B
• A fault inside the headlamp control module B itself
• A loose, corroded, or water damaged connector at the headlamp control module B
• An open or short in the headlamp control module B wiring to the module that receives its data
• A lost power or ground feed to the headlamp control module B

What to do next

1. Scan all modules and record the stored and pending network codes
2. Inspect the headlamp control module B connector pins for corrosion, water, and looseness
3. Confirm the headlamp control module B reports correct live data on the scan tool
4. Check battery voltage and charging output
5. Repair or replace the headlamp control module B if the circuit, power, and bus tests pass
6. Clear the code and retest to confirm the headlamp control module B fault is gone

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