U024C: Lost Communication With Seat Control Module H

What it means

A control module has stopped receiving expected messages from seat control module H. The code identifies the communication loss; seat functions controlled by that module may be affected.

How it works

Seat control module H operates the seat functions assigned to it and reports its status over the vehicle network. U024C sets when another module stops receiving the expected messages from module H, so it identifies a communication loss rather than a specific failed seat function.

Common causes

Most likely first.

1. Bus wiring open or shorted
2. Module without power or ground
3. Module failed

Symptoms

• Seat functions controlled by the module may be unavailable or limited
• A warning may appear depending on the vehicle

How to diagnose it

1. Scan all modules and save the freeze-frame and communication details to identify the reporting module and any related network codes.
2. Check the seat functions associated with module H and record which are unavailable or limited.
3. Inspect module H's connector and nearby bus wiring for looseness, corrosion, damaged pins, or physical harness damage.
4. Check the module's power and ground under the manufacturer's specified conditions.
5. Test the network wiring to module H for an open or short using the manufacturer's wiring information and procedure.
6. If the wiring and supplies are sound, perform the manufacturer's module communication checks before condemning module H.

Common fixes

• Reseat and secure a loose connector at module H.
• Repair damaged or corroded network wiring or connector pins to module H.
• Repair a failed power feed or ground to module H.
• Replace module H only after its power, ground, and network circuit have been verified.

Can I keep driving?

Driving is generally unaffected, but seat functions assigned to module H may not work. Do not drive until the seat is safely positioned if the fault prevents an essential adjustment.