r/Vcds

Hi, I’m troubleshooting central locking on a 2008 Golf 5 (1.6).

Symptoms:

• Remote key adapts successfully in VCDS
• Measuring blocks show signal (0 → 1) when pressing remote
• Hazard lights blink during adaptation
• But no lock/unlock action occurs at all
• Interior central locking button works (except one rear door lock module is faulty)

What’s been done:

• Steering lock was replaced recently
• Battery was disconnected during that work
• Full battery reset performed (including discharge)
• Ignition (Terminal 15) is recognized correctly in measuring blocks
• No obvious communication issues with module 46
• Oil change etc. irrelevant but done recently

Issue during adaptation:

• “Save” button in VCDS was grey / not always clickable
• Unclear if remote slots were actually cleared (Channel 00) and written to EEPROM

Other notes:

• One rear right door lock module is faulty (does not lock/unlock electrically)
• Not sure if that could block remote execution entirely
• Remote signal is definitely received by the comfort module

Question:
What could cause a situation where:

• remote signal is received
• adaptation appears successful
• but central locking does not execute?

Could this be:

• adaptation not properly committed (EEPROM issue)?
• comfort module coding problem?
• door module blocking execution?
• something related to steering lock replacement?

Any ideas or known Golf 5 quirks appreciated.