U024D: Lost Communication With Seat Control Module J

What it means

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

How it works

Seat control module J controls its assigned seat functions and communicates status to other modules over the vehicle network. This code sets when expected messages from module J are missing, pointing to a loss of communication rather than identifying a particular seat adjustment as the cause.

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 record freeze-frame and network details to determine which module logged U024D and whether other modules also report communication faults.
2. Try the seat functions associated with module J and note any unavailable or limited functions.
3. Inspect module J's connector and nearby network wiring for a loose connection, corrosion, bent pins, or harness damage.
4. Verify module J's power and ground according to the manufacturer's test conditions.
5. Check the bus wiring to module J for opens or shorts using the applicable wiring diagram and manufacturer procedure.
6. If the circuit and supplies pass, carry out the manufacturer's communication checks before deciding module J has failed.

Common fixes

• Secure a loose module J connector.
• Repair damaged or corroded network wiring or connector pins leading to module J.
• Restore the module's power or ground if testing finds a fault.
• Replace module J only after its power, ground, and network circuits test correctly.

Can I keep driving?

This is a seat-system communication fault and usually does not affect basic vehicle control, but functions assigned to module J may be unavailable. Make sure the seat is correctly positioned and secure before driving if an adjustment is affected.