MG ZS (Gen2) Keyless Entry Not Working

A Keyless Entry Not Working fault indicates that the vehicle is unable to lock or unlock the doors using the Smart Key system. The keyless entry system relies on the Smart Key fob, Body Control Module (BCM), keyless entry antennas, door handle sensors, door lock actuators, and immobilizer system to authenticate the key and perform locking or unlocking functions. If communication is interrupted by a key, antenna, wiring, control module, or battery fault, the system may become inoperative and store one or more Diagnostic Trouble Codes (DTCs). This fault applies to the MG ZS Gen2 (ZS11 platform), introduced from 2024 onwards.

Symptoms

  • Keyless entry not functioning
  • Doors will not lock or unlock using the Smart Key
  • Passive entry system inoperative
  • Smart Key Not Detected message displayed
  • Push Button Start may not operate
  • Intermittent key detection
  • Door handle touch sensors not responding
  • Immobilizer warning light may illuminate
  • Multiple warning messages displayed
  • Smart Key-related Diagnostic Trouble Codes (DTCs) stored

Possible Causes

  • Flat smart key battery
  • Faulty Smart Key fob
  • Smart Key not programmed
  • Faulty keyless entry antenna
  • Faulty door handle touch sensor
  • Faulty door lock actuator
  • Body Control Module (BCM) fault
  • Immobilizer system fault
  • Damaged wiring harness
  • Loose or corroded electrical connectors
  • CAN Bus communication fault
  • Low vehicle battery voltage

Diagnosis

Diagnosis begins by retrieving all stored Diagnostic Trouble Codes (DTCs) from the Smart Key system, Body Control Module (BCM), immobilizer, and other related control modules using a compatible diagnostic scan tool. Live data should be reviewed to verify Smart Key detection, antenna operation, door handle sensor inputs, and door lock actuator commands.

The technician should inspect the Smart Key battery, keyless entry antennas, door handle sensors, door lock actuators, wiring harnesses, connectors, power supplies, and ground circuits for damage, corrosion, loose terminals, or water intrusion. Key programming, electrical circuit testing, and CAN Bus communication checks should be completed before replacing any components.

For vehicles operating in New Zealand, confirming the condition of the Smart Key battery and verifying key programming before replacing electronic modules can help avoid unnecessary repair costs.

Accurately diagnosing this fault often requires manufacturer testing procedures, wiring diagrams, connector pinouts, Smart Key system schematics, BCM communication diagrams, door locking system layouts, key programming procedures, CAN Bus network diagrams, live data reference values, software calibration files, and system calibration information. Access to the factory service manual significantly reduces diagnostic time and helps prevent unnecessary parts replacement.

Applicable Years

2024, 2025, 2026, onwards

To order the correct OEM Service and Repair Manual for your MG ZS, submit your request using the form below, and our team will provide the ordering details.