Code
B1711
MITSUBISHI
B — Body
ETACS ECU(RAM)
Views:
UK: 8
EN: 13
RU: 6
AI status
Completed
Completed
100%
Causes
- Internal ETACS ECU RAM or processor fault
- Low or unstable battery voltage or a recent battery disconnect
- Supply or ground circuit fault to the ETACS ECU (corrosion, loose connector, broken wire)
- Water/moisture intrusion or connector corrosion at the ECU
- Software corruption or failed update
- Aftermarket electrical accessory causing voltage transients or noise
Symptoms
- One or more body systems operate incorrectly or intermittently (lighting, wipers, power windows, door locks, interior lamps)
- Loss of specific ETACS-controlled functions
- Multiple unrelated body system fault codes or abnormal behavior
- Possible immobilizer/remote key or alarm anomalies
- Illumination of warning lights related to body electronics
What to check
- Use an OBD-II scanner to read/confirm B1711 and related codes; note freeze frame and occurrence count
- Check battery state-of-charge and terminal condition (voltage with ignition ON and cranking)
- Inspect ETACS ECU connectors for corrosion, bent pins, water ingress, or loose locking tangs
- Check fuses and fusible links for ETACS power feeds
- Verify solid ground(s) at ETACS (measure resistance to chassis ground; expect
- Check supply voltage at the ETACS power pin with key ON (should be ~battery voltage)
Signal parameters
- Battery voltage (key ON): approx. 11.5–14.5 V
- Cranking voltage: generally above 9.5 V (refer to factory spec)
- Ground continuity: ETACS ground(s)
- CAN bus idle voltages: each CAN line ≈2.5 V (differential ~0 V idle); active message traffic present when systems awake
- LIN bus idle voltage ≈ battery voltage through pull-up (if applicable)
- Module wake/power supply status: key ON wake signal present; no unexpected voltage spikes
Diagnostic algorithm
- Record DTC and related codes; note freeze-frame data and when code set. 2. Check battery voltage and condition; ensure fully charged and terminals clean. 3. Visually inspect ETACS ECU and connector for water intrusion, corrosion, or damage. 4. Verify fuses and power feeds to ETACS; measure battery voltage at module power pin with ignition ON. 5. Check ground(s) continuity and tightness at the ETACS mounting/ground point. 6. Use scan tool to monitor ETACS live data and CAN/LIN communication; verify module responds to requests. 7. If supply/ground and communication are good, clear codes and perform function tests. If B1711 returns immediately or intermittently with no external cause, suspect internal ECU fault. 8. Check for recent software updates or TSBs and reprogram/reflash ETACS per factory procedure if available. 9. If software reflash does not clear the fault and electrical supply/communication are verified, replace the ETACS ECU and re-initialize/program as required. 10. After repairs, clear codes and verify correct operation of all ETACS-controlled systems and that B1711 does not reappear.
Likely causes
- Failed/defective ETACS ECU (internal RAM or module hardware)
- Intermittent/low battery voltage during ignition or update
- Poor ground or corroded connector at ETACS harness
- CAN/LIN communication errors caused by short or open on bus
- External voltage spike from jump start or aftermarket device
Fault status
Status
ETACS ECU RAM fault — internal memory or module self-check failure detected
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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