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Home / DTC / U0260 — Lost Communication With Seat Control Switch Module “A”

U0260 — Lost Communication With Seat Control Switch Module “A”

Detailed page for trouble code U0260.

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Code

U0260

HYUNDAI U — Network/User

Lost Communication With Seat Control Switch Module “A”

Brand: HYUNDAI
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted wiring between seat switch module and vehicle network (CAN/LIN)
  • Faulty seat control switch module (internal failure)
  • Blown fuse or missing power/ground to the seat switch module
  • Corroded/damaged connector or poor pin contact at the module or junctions
  • Network bus fault (short, missing termination resistor, or other module pulling the bus low)
  • Intermittent connector/wiring fault from vibration or previous repairs

Symptoms

  • Seat adjustment switches non‑functional or intermittent
  • Memory seat recall or heating/ventilation tied to the switch may not work
  • Diagnostic scan tool shows U0260 and possibly other U‑codes on same network
  • No response from seat switch module when attempting to communicate with a scan tool
  • Possible related warnings/messages displayed on cluster (depending on vehicle)

What to check

  • Connect a diagnostic scan tool and verify current/recorded U0260 and any related U‑codes
  • Record freeze frame and network codes; note if other modules report loss of communication
  • Visually inspect connectors at the seat switch module and related harness for corrosion, damage, or loose pins
  • Check fuses and relays for seating circuits (consult service manual for fuse locations)
  • Measure key ON battery voltage at the module power terminal and verify vehicle ground at module chassis screw/ground lead
  • Backprobe or access the module harness to check for CAN (or LIN) bus presence while scanning

Signal parameters

  • Battery supply voltage at module (Key ON) — expected ≈ 12 V (11–14 V)
  • Module ground resistance — low ohms to chassis (close to 0 Ω)
  • CAN bus idle voltages (recessive): CAN H ≈ 2.5 V, CAN L ≈ 2.5 V (typical); dominant state: CAN H ≈ 3.5 V, CAN L ≈ 1.5 V
  • CAN differential when active — messages visible on oscilloscope or scan tool (manufacturer message IDs are proprietary)
  • Termination resistance across CANH–CANL ≈ 60 Ω (two 120 Ω in parallel)
  • Network message/heartbeat frequency for seat module (manufacturer-specific; should be present if module communicating)

Diagnostic algorithm

  1. Retrieve and record all DTCs with a calibrated OEM-capable scan tool. Note any other U‑codes present and freeze frame data.
  2. Verify battery voltage and stable supply (11–14 V) at vehicle battery and at the seat switch module with ignition ON. Repair low voltage or charging faults first.
  3. Inspect module connector and wiring visually and mechanically. Disconnect battery before unfastening connectors if required by service manual. Look for bent pins, corrosion, damaged wires, or water intrusion.
  4. Check fuses/relays for seat circuits; replace any blown fuses and test whether code returns.
  5. With scan tool connected, attempt to communicate with the seat switch module. If no communication, backprobe the module harness for power and ground confirmation. If power/ground present and no comms, proceed to bus checks.
  6. Check CAN (or LIN if applicable) bus at the module: measure idle voltages on CANH and CANL and compare to expected values. Use an oscilloscope or CAN bus monitor to confirm message traffic and differential signaling.
  7. Measure termination resistance across CANH–CANL. Remove connectors/turn off ignition if required to isolate and measure. Verify approx. 60 Ω total (two 120 Ω resistors in parallel) or per factory spec.
  8. If wiring and bus appear good but module does not respond, inspect upstream connectors and wiring to BCM/IPC for opens/shorts. Perform continuity checks between module pins and BCM harness connector pins.
  9. If wiring, power, ground, and bus are verified and no external faults found, replace or reprogram the seat control switch module per manufacturer procedures. Ensure correct software/configuration and immobilizer/programming steps are followed.
  10. After repair, clear codes and perform verification: cycle ignition, operate seat functions, and re-scan to confirm U0260 does not return.
  11. Note: Follow manufacturer safety and programming procedures. Some modules require dealer-level reprogramming or immobilizer/security steps; do not replace modules unless wiring and power are verified.

Likely causes

  • Disconnected or corroded connector at seat switch module
  • Blown fuse or missing key-switched power to the module
  • Open/short in CAN high/low pair between module and BCM
  • Failed seat control switch module
  • Fault in a nearby module affecting the shared network wiring

Fault status

⚠️ Status
Lost Communication With Seat Control Switch Module "A" — no network messages received from module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 to 3.0 hours

Similar codes

U0100 U0121 U0155 U0251 U0261
371

Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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