Seeing the leader’s header does not establish that the intended responder replied. The two parts of the exchange need separate identification.
What to check next
For a replacement sensor or actuator that remains unavailable, compare power, ground, part compatibility and the expected response. Check whether the recording reaches the correct branch. A leader that sends requests can coexist with a local connection or responder problem.
Useful information for an enquiry
Send the original and replacement part numbers and a trace that includes the request and following interval.
Do not infer that the entire body controller has failed simply because one local device remains silent.
Speak to AXION
For CAN-bus and vehicle-network diagnostics, send your vehicle details and fault report. Workshop assessment is in Didcot, Oxfordshire. Suitable postal or remote work is confirmed before booking.
Technical background from NXP. The referenced design explains the principle; the vehicle-specific procedure determines the repair.
Related reading — Replacement LIN devices and the importance of the correct variant. Browse all vehicle-electronics diagnostic notes or return to the repair library.