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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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U0260

Generic U — Network/User

Lost Communication With Seat Control Switch Module A

Brand: Generic
Type: U — Network/User
Views: UK: 16 EN: 36 RU: 24
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse or lost power to the seat control switch module
  • Poor or missing ground at the seat control switch module
  • Open, shorted, or corroded wiring/connectors on the CAN bus to the seat control switch module
  • Faulty seat control switch module (internal failure)
  • CAN bus wiring short to battery or ground or high resistance in bus
  • Network gateway, BCM or another module not forwarding messages or misconfigured

Symptoms

  • Seat controls (adjust, heat, memory) partially or fully inoperative
  • Seat memory functions not working or error message on instrument cluster
  • One or more network-related warning messages or chimes
  • Related modules reporting U-codes for communication faults
  • No response from the seat switch module when queried with a scan tool

What to check

  • Read and record all U-codes and freeze frame data with a capable scan tool
  • Confirm whether the seat control switch module is present in the network module list
  • Visually inspect connectors and harness at the seat switch/module for damage or corrosion
  • Check fuses and measure key-on power and ground at the module connector
  • Perform a wiggle test on harness while monitoring communication to reproduce intermittent faults
  • Measure CAN bus voltage levels and bus resistance with battery disconnected (expected approx. 60 Ω between CAN H and CAN L through terminations)

Signal parameters

  • Idle CAN bus voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (nominal, system dependent)
  • Dominant state typical voltages: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (approx. 2 V differential)
  • Expected bus termination resistance: ~60 Ω measured across CAN_H and CAN_L (two 120 Ω terminators in parallel)
  • Typical CAN data rate: commonly 250–500 kb/s (vehicle dependent)
  • Module should respond to periodic network messages or diagnostic requests when ignition is ON

Diagnostic algorithm

  1. Verify the code: connect a diagnostic scanner, confirm U0260 and record any related codes and freeze-frame data.
  2. Check network presence: attempt to communicate with the seat control switch module using the scanner; note if module appears in module list.
  3. Visual inspection: inspect seat switch/module connector and mating harness for corrosion, bent pins, water intrusion, or damage.
  4. Power & ground: with ignition ON, verify module supply voltage and ground at the connector pins. Repair any blown fuses or open supplies before proceeding.
  5. CAN physical checks: with ignition OFF and battery disconnected, measure resistance between CAN_H and CAN_L at the module connector; expect ≈60 Ω. Check for shorts to battery or ground on each CAN line.
  6. Live bus checks: with ignition ON, measure CAN_H and CAN_L voltages and observe differential behavior while sending requests from the scan tool. Use an oscilloscope if available to view message traffic and noise.
  7. Wiggle/intermittent test: while monitoring communications, gently manipulate the harness and connectors to try to reproduce the fault; isolate any section that causes loss of comms.
  8. Isolate module: if wiring and power/ground are good but no communications, try substituting a known-good module or bench-test the module if possible. Check for available software updates or reprogramming notes from manufacturer.
  9. Repair and verify: repair wiring/connectors, replace the module if confirmed faulty, clear codes, then verify repair by re-scanning and confirming proper seat function and no return of the U0260 code after normal vehicle operation/cycles.

Likely causes

  • Loose, corroded, or disconnected connector at the seat switch/module
  • Blown fuse or missing module supply/ground
  • Open or shorted CAN high/low wiring between the module and gateway/BCM
  • Failed seat control switch module
  • Intermittent wiring (pin damage, harness rubbing) causing intermittent comms

Fault status

⚠️ Status
Lost Communication With Seat Control Switch Module A (no response from module on vehicle network)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-3.0 hours

Similar codes

U0100 U0121 U0140 U0155 U0253
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Code

U0260

HYUNDAI U — Network/User

Lost Communication With Seat Control Switch Module “A”

Brand: HYUNDAI
Type: U — Network/User
Views: UK: 13 EN: 24 RU: 14
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse or lost power to the seat control switch module
  • Poor or missing ground at the seat control switch module
  • Open, shorted, or corroded wiring/connectors on the CAN bus to the seat control switch module
  • Faulty seat control switch module (internal failure)
  • CAN bus wiring short to battery or ground or high resistance in bus
  • Network gateway, BCM or another module not forwarding messages or misconfigured

Symptoms

  • Seat controls (adjust, heat, memory) partially or fully inoperative
  • Seat memory functions not working or error message on instrument cluster
  • One or more network-related warning messages or chimes
  • Related modules reporting U-codes for communication faults
  • No response from the seat switch module when queried with a scan tool

What to check

  • Read and record all U-codes and freeze frame data with a capable scan tool
  • Confirm whether the seat control switch module is present in the network module list
  • Visually inspect connectors and harness at the seat switch/module for damage or corrosion
  • Check fuses and measure key-on power and ground at the module connector
  • Perform a wiggle test on harness while monitoring communication to reproduce intermittent faults
  • Measure CAN bus voltage levels and bus resistance with battery disconnected (expected approx. 60 Ω between CAN H and CAN L through terminations)

Signal parameters

  • Idle CAN bus voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (nominal, system dependent)
  • Dominant state typical voltages: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (approx. 2 V differential)
  • Expected bus termination resistance: ~60 Ω measured across CAN_H and CAN_L (two 120 Ω terminators in parallel)
  • Typical CAN data rate: commonly 250–500 kb/s (vehicle dependent)
  • Module should respond to periodic network messages or diagnostic requests when ignition is ON

Diagnostic algorithm

  1. Verify the code: connect a diagnostic scanner, confirm U0260 and record any related codes and freeze-frame data.
  2. Check network presence: attempt to communicate with the seat control switch module using the scanner; note if module appears in module list.
  3. Visual inspection: inspect seat switch/module connector and mating harness for corrosion, bent pins, water intrusion, or damage.
  4. Power & ground: with ignition ON, verify module supply voltage and ground at the connector pins. Repair any blown fuses or open supplies before proceeding.
  5. CAN physical checks: with ignition OFF and battery disconnected, measure resistance between CAN_H and CAN_L at the module connector; expect ≈60 Ω. Check for shorts to battery or ground on each CAN line.
  6. Live bus checks: with ignition ON, measure CAN_H and CAN_L voltages and observe differential behavior while sending requests from the scan tool. Use an oscilloscope if available to view message traffic and noise.
  7. Wiggle/intermittent test: while monitoring communications, gently manipulate the harness and connectors to try to reproduce the fault; isolate any section that causes loss of comms.
  8. Isolate module: if wiring and power/ground are good but no communications, try substituting a known-good module or bench-test the module if possible. Check for available software updates or reprogramming notes from manufacturer.
  9. Repair and verify: repair wiring/connectors, replace the module if confirmed faulty, clear codes, then verify repair by re-scanning and confirming proper seat function and no return of the U0260 code after normal vehicle operation/cycles.

Likely causes

  • Loose, corroded, or disconnected connector at the seat switch/module
  • Blown fuse or missing module supply/ground
  • Open or shorted CAN high/low wiring between the module and gateway/BCM
  • Failed seat control switch module
  • Intermittent wiring (pin damage, harness rubbing) causing intermittent comms

Fault status

⚠️ Status
Lost Communication With Seat Control Switch Module A (no response from module on vehicle network)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-3.0 hours

Similar codes

U0100 U0121 U0140 U0155 U0253
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