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Home / DTC / U054D — Invalid Data Received from Seat Control Module H

U054D — Invalid Data Received from Seat Control Module H

Detailed page for trouble code U054D.

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Code

U054D

Generic U — Network/User

Invalid Data Received from Seat Control Module H

Brand: Generic
Type: U — Network/User
Views: UK: 18 EN: 26 RU: 14
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Page language: EN

Causes

  • Faulty Seat Control Module H (firmware corruption or internal fault)
  • Damaged wiring or connectors between the seat module and network (open, short, corrosion)
  • CAN/LIN bus physical layer problems (terminations, high resistance, short to battery/ground)
  • Multiple modules with same network ID or bus contention
  • Intermittent low battery/poor ground causing data corruption
  • Software/calibration mismatch after a module replacement or update

Symptoms

  • Seat functions erratic or nonfunctional (power adjustment, heating, memory)
  • Seat-related warnings or message on instrument cluster
  • Multiple communication or invalid-data U-codes stored
  • Intermittent operation of other devices on same network segment
  • Module appears in scan tool but returns invalid parameters or fails to respond properly

What to check

  • Read and record all U-codes and freeze frame data with a scan tool; note occurrence and related modules
  • Check vehicle battery state and charging system voltage (battery at rest and while cranking)
  • Inspect fuses and relays for seat circuits and network power feeds
  • Visually inspect seat wiring harness, connectors, and ground points for damage, corrosion, or loose pins
  • Check for other network-related codes that could indicate wider bus issues
  • Measure CAN/LIN bus idle voltages at the seat module connector: CAN_H and CAN_L; compare to expected values

Signal parameters

  • Battery/supply voltage to seat module: ~12 V nominal (check for drops under load)
  • CAN bus idle voltages: CAN_H ≈2.5 V, CAN_L ≈2.5 V; dominant state CAN_H rises toward ~3.5 V and CAN_L drops toward ~1.5 V (differential ~2 V)
  • Expected termination resistance across CAN_H and CAN_L ≈60 ohms (two 120 Ω resistors in parallel)
  • Ground continuity: module ground to chassis ≈0 Ω–few ohms
  • Message frequency/IDs: seat module should periodically transmit defined IDs — verify presence and frequency with a scope or data logger (manufacturer-specific IDs)

Diagnostic algorithm

  1. Verify and record freeze frame and all stored U-codes. Check for related codes on same network.
  2. Confirm vehicle battery voltage and good charging system (12.4–12.8 V at rest; >13.5 V running). Recharge or load-test battery if needed.
  3. Visually inspect harnesses, connectors, and ground straps at seat module and under-seat area; repair any damage, corrosion, or poor crimps.
  4. Check fuses and power/ignition feeds for the seat module; verify module has stable 12 V and good ground.
  5. Using a scan tool, confirm the seat module is present on the network and view live data for plausibility. Note any missing or garbled signals.
  6. With an oscilloscope or CAN/LIN bus analyzer, check physical layer: look for correct idle voltages, clean dominant/recessive transitions, and absence of excessive noise or voltage drops.
  7. Measure termination resistance across CAN_H/L with ignition off; expect ≈60 Ω. If out of range, inspect termination resistors and wiring.
  8. Perform wiggle test on the seat harness/connectors while monitoring live data or watching for the code to set/clear.
  9. If another module recently replaced or reprogrammed, verify software/calibration matches vehicle; perform reflash/update if required.
  10. If physical layer and wiring are good but invalid data persists, try isolating the seat module (disconnect its connector) and observe if code behavior changes or other modules report bus issues.
  11. If isolation indicates a faulty module, replace or bench-test seat module and reprogram as required. After repair, clear codes and perform road or bench test to confirm no recurrence.
  12. Document repair and perform final scan for related codes and functionality of seat features.

Likely causes

  • Connector pin corrosion or bent pins at seat harness
  • Broken/shorted CAN/LIN twisted pair near seat or control module
  • Seat module power or ground intermittent due to loose fastener or broken splice
  • Module firmware incompatible with vehicle network after replacement or reflash

Fault status

⚠️ Status
Controller detected invalid or malformed data received from Seat Control Module H. Communication packets from the module contain unexpected values or fail integrity checks, potentially causing seat features to behave incorrectly.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0401 U0415 U0100 U0144 U0155
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