Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Security System / Keyless Entry System - Testing & Troubleshooting (Except Hybrid)
2015 Acura MDX BaseSECTION Security System / Keyless Entry System - Testing & Troubleshooting (Except Hybrid)
- Symptom Troubleshooting Index for Viewer
- All the doors and will not lock and unlock (2014 2015)
- All the doors and will not lock and unlock (2016 2017 2018 2019 2020)
- All the doors will not lock or unlock with driver's door key cylinder or door lock switch or keyless transmitter
- Cannot select ON mode with keyless access and with the keyless remote touching the engine start/stop switch (2014 2015)
- Cannot select ON mode with keyless access and with the keyless remote touching the engine start/stop switch (2016 2017 2018 2019 2020)
- Cannot select ON mode with keyless access, but can select ON mode with the keyless remote touching the engine start/stop switch (2014 2015)
- Cannot select ON mode with keyless access, but can select ON mode with the keyless remote touching the engine start/stop switch (2016 2017 2018 2019 2020)
- Cannot select ON mode with the keyless remote touching the engine start/stop switch, but can select ON mode with keyless access (2014 2015)
- Cannot select ON mode with the keyless remote touching the engine start/stop switch, but can select ON mode with keyless access (2016 2017 2018 2019 2020)
- Driver's door will not lock or unlock
- Engine does not crank (power supply is normal) (2014 2015)
- Engine does not crank (power supply is normal) (2016 2017 2018 2019 2020)
- Engine start/stop switch does not work (2014 2015)
- Engine start/stop switch does not work (2016 2017 2018 2019 2020)
- Front passenger's and right rear doors will not lock or unlock
- Immobilizer indicator does not go off or does not come on (2014 2015)
- Immobilizer indicator does not go off or does not come on (2016 2017 2018 2019 2020)
- Keyless access indicator does not go off or does not come on (2014 2015)
- Keyless access indicator does not go off or does not come on (2016 2017 2018 2019 2020)
- Left rear door will not lock or unlock
- Passenger doors will not unlock with the transmitter or key cylinder switch, but will unlock with the inside door unlock switch
- The doors will not unlock or lock with the door outer handle touch sensor or lock switch, but will unlock or lock with the keyless remote (2014 2015)
- The doors will not unlock or lock with the door outer handle touch sensor or lock switch, but will unlock or lock with the keyless remote (2016 2017 2018 2019 2020)
- The doors will not unlock or lock with the keyless remote, but will unlock or lock with the door outer handles (2014 2015)
- The doors will not unlock or lock with the keyless remote, but will unlock or lock with the door outer handles (2016 2017 2018 2019 2020)
- The engine starts, but stalls immediately (2014 2015)
- The engine starts, but stalls immediately (2016 2017 2018 2019 2020)
- The key-in reminder does not sound (2014 2015)
- The key-in reminder does not sound (2016 2017 2018 2019 2020)
- The key-in reminder sounds in vehicle OFF mode when door is open (2014 2015)
- The key-in reminder sounds in vehicle OFF mode when door is open (2016 2017 2018 2019 2020)
- The mode changes between ACC and ON, but it does not change to OFF (2014 2015)
- The mode changes between ACC and ON, but it does not change to OFF (2016 2017 2018 2019 2020)
- The mode changes between ACC and ON, but it is difficult to change to OFF (2014 2015)
- The mode changes between ACC and ON, but it is difficult to change to OFF (2016 2017 2018 2019 2020)
- Keyless Access System Registration Procedures
- Check
- Component Location Index
- Input Test
- Keyless Access System (Keyless Access Control Unit, Electric Steering Lock, and TPMS Control Unit) Input Test (2014 2015)
- Keyless Access System (Keyless Access Control Unit, Electric Steering Lock, and TPMS Control Unit) Input Test (2016)
- Keyless Access System (Keyless Access Control Unit, Electric Steering Lock, and TPMS Control Unit) Input Test (2017 2018 2019 2020)
- Keyless/Power Door Locks/Security System (MICU, Door Multiplex Control Unit, Rear MICU, Front Passenger's Power Window Switch, and Relay Control Module) Input Test (2014 2015)
- Keyless/Power Door Locks/Security System (MICU, Door Multiplex Control Unit, Rear MICU, Front Passenger's Power Window Switch, and Relay Control Module) Input Test (2016)
- Keyless/Power Door Locks/Security System (MICU, Door Multiplex Control Unit, Rear MICU, Front Passenger's Power Window Switch, and Relay Control Module) Input Test (2017 2018 2019 2020)
- Description & Operation
- Keyless Access System Description - Components
- Keyless Access System Description - Control/Function (2014 2015)
- Keyless Access System Description - Control/Function (2016)
- Keyless Access System Description - Control/Function (2017 2018 2019 2020)
- Keyless Access System Description - Failsafe Function
- Keyless Access System Description - Overview (2014 2015)
- Keyless Access System Description - Overview (2016)
- Keyless Access System Description - System Diagram (2014 2015)
- Keyless Access System Description - System Diagram (2016)
- Keyless Access System Description - System Diagram (2017 2018 2019 2020)
- Keyless/Power Door Locks/Security System Description - Components
- Keyless/Power Door Locks/Security System Description - Control/Function
- Keyless/Power Door Locks/Security System Description - Overview
- Keyless/Power Door Locks/Security System Description - System Diagram
- Test
- Door Key Cylinder Switch Test
- Door Lock Actuator Test
- Door Lock Knob Switch Test
- Door Outer Handle Lock Switch Test
- Engine Start/Stop Switch Test
- HomeLink Remote Control System Test (2014 2015)
- HomeLink Remote Control System Test (2016)
- HomeLink Remote Control System Test (2017 2018 2019 2020)
- HomeLink Switch Test
- Keyless Access LF Antenna Function Test
- Keyless Access System Status Log
- General Information
- How to Information
- Circuit Diagram
- HomeLink Remote Control System Circuit Diagram (2014 2015)
- HomeLink Remote Control System Circuit Diagram (2016)
- HomeLink Remote Control System Circuit Diagram (2017 2018 2019 2020)
- Keyless Access System Circuit Diagram (2014 2015)
- Keyless Access System Circuit Diagram (2016)
- Keyless Access System Circuit Diagram (2017 2018)
- Keyless Access System Circuit Diagram (2019 2020)
- Keyless/Power Door Locks/Security System Circuit Diagram (2014 2015)
- Keyless/Power Door Locks/Security System Circuit Diagram (2016)
- Keyless/Power Door Locks/Security System Circuit Diagram (2017 2018)
- Keyless/Power Door Locks/Security System Circuit Diagram (2019 2020)
- Symptom Troubleshooting
- Keyless Access System Symptom Troubleshooting - All the doors will not lock and unlock
- Keyless Access System Symptom Troubleshooting - Cannot select ON mode with keyless access and with the keyless remote touching the engine start/stop switch (2014 2015)
- Keyless Access System Symptom Troubleshooting - Cannot select ON mode with keyless access and with the keyless remote touching the engine start/stop switch (With Electric Steering Lock) (2016)
- Keyless Access System Symptom Troubleshooting - Cannot select ON mode with keyless access and with the keyless remote touching the engine start/stop switch (Without Electric Steering Lock) (2016)
- Keyless Access System Symptom Troubleshooting - Cannot select ON mode with keyless access and with the keyless remote touching the engine start/stop switch (With Electric Steering Lock) (2017 2018 2019 2020)
- Keyless Access System Symptom Troubleshooting - Cannot select ON mode with keyless access and with the keyless remote touching the engine start/stop switch (Without Electric Steering Lock) (2017 2018 2019 2020)
- Keyless Access System Symptom Troubleshooting - Cannot select ON mode with keyless access, but can select ON mode with the keyless remote touching the engine start/stop switch
- Keyless Access System Symptom Troubleshooting - Immobilizer indicator does not go off or does not come on
- Keyless Access System Symptom Troubleshooting - Keyless access indicator does not go off or does not come on
- Keyless Access System Symptom Troubleshooting - The doors will not unlock or lock with the door outer handle touch sensor or lock switch, but will unlock or lock with the keyless remote (2014 2015 2016)
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.