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)
2018 Acura RLX BaseSECTION Security System Keyless Entry System - Testing & Troubleshooting (Except Hybrid)
- Keyless/Power Door Locks/Security System Symptom Troubleshooting
- Troubleshooting
- General Information
- Check
- Input Test
- Keyless Access Control Unit Input Test (KA/KC model) (2016 2017)
- Keyless Access System (Keyless Access Control Unit and TPMS Control Unit) Input Test (2018 2019 2020)
- Keyless Access System (Keyless Access Control Unit, Keyless Access and Electric Steering Lock) Input Test (2014 2015)
- Keyless/Power Door Locks/Security System (MICU, Door Multiplex Control Unit, 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, Front Passenger's Power Window Switch, and Relay Control Module) Input Test (2016 2017)
- Keyless/Power Door Locks/Security System (MICU, Door Multiplex Control Unit, Front Passenger's Power Window Switch, and Relay Control Module) Input Test (2018 2019 2020)
- Registration
- Symptom Troubleshooting Index
- Component Location Index
- HomeLink Remote Control System Component Location Index
- Keyless Access System Component Location Index
- Keyless Access System Component Location Index (KX, 14-15 KA model)
- Keyless/Power Door Locks/Security System Component Location Index (2014 2015)
- Keyless/Power Door Locks/Security System Component Location Index (10-Speed A/T) (2016 2017 2018 2019 2020)
- Keyless/Power Door Locks/Security System Component Location Index (6-Speed A/T) (2014 2015 2016 2017)
- Symptom Troubleshooting Index for Viewer
- All the doors and the trunk lid will not lock and unlock (2014 2015 2016 2017)
- All the doors will not lock and unlock (KA/KC model) (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
- Auto door unlock does not work
- Cannot select ON mode with keyless access and with the keyless remote touching the engine start/stop switch (2014 2015 2016 2017)
- Cannot select ON mode with keyless access and with the keyless remote touching the engine start/stop switch (KA/KC model) (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 2016 2017)
- Cannot select ON mode with keyless access, but can select ON mode with the keyless remote touching the engine start/stop switch (KA/KC model) (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 2016 2017)
- Cannot select ON mode with the keyless remote touching the engine start/stop switch, but can select ON mode with keyless access (KA/KC model) (2016 2017 2018 2019 2020)
- Doors automatically relock 30 seconds after being unlocked with the remote even though a door has been opened
- Driver's door will not lock or unlock
- Engine does not crank (power supply is normal) (2014 2015 2016 2017)
- Engine does not crank (power supply is normal) (KA/KC model) (2016 2017 2018 2019 2020)
- Engine start/stop switch does not work (2014 2015 2016 2017)
- Engine start/stop switch does not work (KA/KC model) (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 2016 2017)
- Immobilizer indicator does not go off or does not come on (KA/KC model) (2016 2017 2018 2019 2020)
- Keyless access indicator does not go off or does not come on (2014 2015 2016 2017)
- Keyless access indicator does not go off or does not come on (KA/KC model) (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
- Security alarm system will not arm
- 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 2017)
- 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 (KA/KC model) (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 2016 2017)
- The doors will not unlock or lock with the keyless remote, but will unlock or lock with the door outer handles (KA/KC model) (2016 2017 2018 2019 2020)
- The engine starts, but stalls immediately (2014 2015 2016 2017)
- The engine starts, but stalls immediately (KA/KC model) (2016 2017 2018 2019 2020)
- The horn does not sound and/or the headlights do not flash when the PANIC button on the remote is pressed
- The key-in reminder does not sound (2014 2015 2016 2017)
- The key-in reminder sounds in vehicle OFF mode when door is open (2014 2015 2016 2017)
- The mode changes between ACC and ON, but it does not change to OFF (2014 2015 2016 2017)
- The mode changes between ACC and ON, but it does not change to OFF (KA/KC model) (2016 2017 2018 2019 2020)
- The mode changes between ACC and ON, but it is difficult to change to OFF (2014 2015 2016 2017)
- The mode changes between ACC and ON, but it is difficult to change to OFF (KA/KC model) (2016 2017 2018 2019 2020)
- The mode changes between ACCESSORY and ON, but it does not change to OFF (KA/KC model) (2016 2017 2018 2019 2020)
- The mode changes between ACCESSORY and ON, but it is difficult to change to OFF (KA/KC model) (2016 2017 2018 2019 2020)
- The security system sounds randomly while the doors are locked
- Description & Operation
- Keyless Access System Description - Components (2014 2015 2016 2017)
- Keyless Access System Description - Components (2018 2019 2020)
- Keyless Access System Description - Components (KA/KC model) (2016 2017)
- Keyless Access System Description - Control/Function (2014 2015 2016 2017)
- Keyless Access System Description - Control/Function (2018 2019 2020)
- Keyless Access System Description - Control/Function (KA/KC model) (2016 2017)
- Keyless Access System Description - Failsafe Function
- Keyless Access System Description - Overview (2014 2015 2016 2017)
- Keyless Access System Description - Overview (2018 2019 2020)
- Keyless Access System Description - Overview (KA/KC model) (2016 2017)
- Keyless Access System Description - System Diagram (2014 2015 2016 2017)
- Keyless Access System Description - System Diagram (2018 2019 2020)
- Keyless Access System Description - System Diagram (KA/KC model) (2016 2017)
- Keyless/Power Door Locks/Security System Description - Components
- Keyless/Power Door Locks/Security System Description - Control/Function (2014 2015)
- Keyless/Power Door Locks/Security System Description - Control/Function (2016 2017)
- Keyless/Power Door Locks/Security System Description - Control/Function (2018 2019 2020)
- Keyless/Power Door Locks/Security System Description - Overview (2014 2015)
- Keyless/Power Door Locks/Security System Description - Overview (2016 2017)
- Keyless/Power Door Locks/Security System Description - Overview (2018 2019 2020)
- Keyless/Power Door Locks/Security System Description - System Diagram (2014 2015)
- Keyless/Power Door Locks/Security System Description - System Diagram (2016 2017)
- Keyless/Power Door Locks/Security System Description - System Diagram (2018 2019 2020)
- Test
- Door Key Cylinder Switch Test
- Door Lock Actuator Test
- Door Lock Knob Switch Test
- Engine Start/Stop Switch Test
- HomeLink Remote Control System Test (2014 2015 2016)
- HomeLink Remote Control System Test (2017 2018 2019 2020)
- HomeLink Switch Test
- Keyless Access LF Antenna (Door and Trunk) Function Test
- Keyless Access LF Antenna (Interior) Function Test
- Keyless Access LF Antenna Function Test (KA/KC model) (2016 2017 2018 2019 2020)
- Keyless Access System Status Log
- Keyless Access System Status Log (KA/KC model) (2016 2017 2018 2019 2020)
- Circuit Diagram
- HomeLink Remote Control System Circuit Diagram (2014 2015 2016)
- HomeLink Remote Control System Circuit Diagram (2017 2018 2019 2020)
- Keyless Access System Circuit Diagram (2014 2015)
- Keyless Access System Circuit Diagram (2018 2019 2020)
- Keyless Access System Circuit Diagram (KA/KC model) (2016 2017)
- Keyless/Power Door Locks/Security System Circuit Diagram (2014 2015)
- Keyless/Power Door Locks/Security System Circuit Diagram (2016 2017)
- Keyless/Power Door Locks/Security System Circuit Diagram (2018 2019 2020)
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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.