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Home / DTC / U1109 — ETACS CAN timeout/Not equipped

U1109 — ETACS CAN timeout/Not equipped

Detailed page for trouble code U1109.

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22,491specific
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Code

U1109

MITSUBISHI U — Network/User

ETACS CAN timeout/Not equipped

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

Causes

  • ETACS module failure (internal electronics or CAN transceiver)
  • ETACS not fitted for this vehicle/market or replaced with non-programmed unit
  • Blown fuse or loss of supply/ground to ETACS
  • Open, short or high-resistance in CAN_H/CAN_L wiring or connector corrosion
  • CAN bus termination missing or incorrect (faulty resistor)
  • Another module on the CAN bus pulling the network down

Symptoms

  • Loss of functions controlled by ETACS (interior lights, wipers, remote locking, alarm, timed lighting)
  • Other modules reporting communication errors or degraded operation
  • Keyless entry, immobilizer or convenience features not working
  • Multiple CAN-related U-codes present
  • No ETACS messages visible on scan tool or CAN bus monitor

What to check

  • Verify vehicle is equipped with ETACS for this VIN/market and that the correct part is installed
  • Check for relevant blown fuses and proper battery voltage (stable 12 V)
  • Use a scan tool to read U1109 and any additional communication fault codes
  • Check for presence of ETACS in module list and attempt to communicate with it
  • Inspect ETACS connector and wiring for corrosion, damage, or loose pins
  • Measure CAN bus voltages at ETACS connector (CAN_H, CAN_L) and check for expected idle levels

Signal parameters

  • CAN recessive idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (both near mid-rail)
  • CAN dominant voltages: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ≈ 2 V)
  • Expected termination resistance: about 60 Ω measured between CAN_H and CAN_L (two 120 Ω in parallel)
  • Bus traffic: vehicle networks typically 125/250/500 kbps depending on system — expect regular CAN frames when healthy
  • No traffic or constant dominant state indicates bus fault or module driving bus low

Diagnostic algorithm

  1. Confirm vehicle equip and that ETACS should be present. Check service history for ETACS replacement.
  2. Verify battery voltage and check fuses/power feeds to ETACS. Repair any supply or ground issues.
  3. Use a scan tool to confirm U1109 and record any other U-codes or module communication failures.
  4. Attempt to communicate directly with the ETACS module via diagnostic tool. Note if module is detected or not.
  5. Visually inspect ETACS connector, wiring harness, and nearby components for corrosion, damage, or water entry. Repair as necessary.
  6. Measure CAN_H and CAN_L at the ETACS connector with a multimeter and compare to expected idle voltages. Check termination resistance (~60 Ω).
  7. Use a scope or CAN analyzer to observe CAN traffic at the ETACS connector. Look for valid frames, proper baud rate, and any bus errors or dominant state.
  8. If bus fault suspected, isolate segments by disconnecting connectors/modules one at a time to find the offending node. Replace or repair the faulty module/wiring.
  9. If ETACS is present but not responding and wiring/power/termination are good, consider replacing ETACS or bench-testing the unit (or swap with known-good unit if available).
  10. After repairs, clear codes, reprogram/configure replacement module if fitted, and verify normal communication and restoration of functions.

Likely causes

  • Physical damage or water ingress at ETACS connector
  • Fuse related to ETACS power is blown or ignition supply interrupted
  • CAN transceiver on ETACS failed (no differential signals)
  • Aftermarket device installed on CAN bus causing bus-off or noise
  • Module was replaced but not configured/coded to vehicle

Fault status

⚠️ Status
ETACS CAN Timeout / Not Equipped — ETACS module did not respond on CAN bus or expected CAN messages from ETACS are absent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

U0100 U0073 U0115 U0140 U0121
406

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