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.
ADAS / Cruise Control System - Testing & Troubleshooting (Except Hybrid)
2018 Acura RLX BaseSECTION ADAS / Cruise Control System - Testing & Troubleshooting (Except Hybrid)
- Adaptive Cruise Control (ACC) Symptom Troubleshooting
- ACC activation indicator (on the MID) does not come on
- ACC activation indicator (on the MID) does not go off
- ACC activation indicator does not come on
- ACC activation indicator does not go off
- ACC indicator (on the MID) does not come on
- ACC indicator (on the MID) does not go off
- ACC indicator does not come on
- ACC indicator does not go off (2016 2017)
- ACC indicator does not go off (2018 2019 2020)
- Does not sense the vehicle driving ahead (2014 2015)
- Does not sense the vehicle driving ahead (2016 2017 2018 2019 2020)
- Intermittently senses the vehicle driving ahead (2014 2015)
- Intermittently senses the vehicle driving ahead (2016 2017 2018 2019 2020)
- Senses a vehicle driving in another lane (2014 2015)
- Senses a vehicle driving in another lane (2016 2017 2018 2019 2020)
- Collision Mitigation Braking System (CMBS) Symptom Troubleshooting
- Lane Keeping Assist System (LKAS) Symptom Troubleshooting
- LKAS activation indicator (on the MID) does not come on (2014 2015)
- LKAS activation indicator (on the MID) does not come on (2016 2017 2018 2019 2020)
- LKAS activation indicator (on the MID) does not go off (2014 2015)
- LKAS activation indicator (on the MID) does not go off (2016 2017 2018 2019 2020)
- LKAS indicator (on the MID) does not come on (2014 2015)
- LKAS indicator (on the MID) does not come on (2016 2017 2018 2019 2020)
- LKAS indicator (on the MID) does not go off (2014 2015)
- LKAS indicator (on the MID) does not go off (2016 2017)
- LKAS indicator (on the MID) does not go off (2018 2019 2020)
- Connector View
- Rewrite
- Input Test
- General Servicing
- How to Information
- How to Troubleshoot the Adaptive Cruise Control (ACC)
- ACC Indicator (Amber)
- Multi-Information Display (MID) Indication
- Self-Diagnostic Function
- ACC Unit
- Dirt or dust detective function (Clean Millimeter Wave Radar Indication)
- Millimeter Wave Radar
- CAN Communication
- Millimeter Wave Radar Aiming
- Intermittent Failures
- How to Troubleshoot DTCs
- How to Retrieve DTCs
- How to Clear DTCs
- How to Read ACC System Auto Stop Control History
- How to Troubleshoot the Collision Mitigation Braking System (CMBS)
- How to Troubleshoot the Adaptive Cruise Control (ACC)
- Symptom Troubleshooting Index
- Adaptive Cruise Control (ACC) Symptom Troubleshooting Index (Adaptive Cruise Control) (2014 2015)
- Adaptive Cruise Control (ACC) Symptom Troubleshooting Index (Adaptive Cruise Control) (2016 2017 2018 2019 2020)
- Collision Mitigation Braking System (CMBS) Symptom Troubleshooting Index (Collision Mitigation Braking System) (2014 2015)
- Collision Mitigation Braking System (CMBS) Symptom Troubleshooting Index (Collision Mitigation Braking System) (2016 2017 2018 2019 2020)
- Cruise Control Symptom Troubleshooting Index (Cruise Control)
- Lane Keeping Assist System (LKAS) Symptom Troubleshooting Index (Lane Keeping Assist System) (2014 2015)
- Lane Keeping Assist System (LKAS) Symptom Troubleshooting Index (Lane Keeping Assist System) (2016 2017 2018 2019 2020)
- Component Location Index
- Adaptive Cruise Control (ACC) Component Location Index (2014 2015)
- Adaptive Cruise Control (ACC) Component Location Index (2016 2017 2018 2019 2020)
- Collision Mitigation Braking System (CMBS) Component Location Index
- Collision Mitigation Braking System (CMBS) Component Location Index (2014 2015 2016 2017)
- Cruise Control Component Location Index
- Lane Keeping Assist System (LKAS) Component Location Index (2014 2015)
- Lane Keeping Assist System (LKAS) Component Location Index (2016 2017 2018 2019 2020)
- Symptom Troubleshooting Index for Viewer
- ACC OFF is displayed on the MID unexpectedly (Adaptive Cruise Control) (2016 2017 2018 2019 2020)
- ACC activation indicator does not come on (Adaptive Cruise Control) (2014 2015)
- ACC activation indicator does not come on (Adaptive Cruise Control) (2016 2017 2018 2019 2020)
- ACC activation indicator does not go off (Adaptive Cruise Control) (2014 2015)
- ACC activation indicator does not go off (Adaptive Cruise Control) (2016 2017 2018 2019 2020)
- ACC indicator does not come on (Adaptive Cruise Control) (2014 2015)
- ACC indicator does not come on (Adaptive Cruise Control) (2016 2017 2018 2019 2020)
- ACC indicator does not go off (Adaptive Cruise Control) (2014 2015)
- ACC indicator does not go off (Adaptive Cruise Control) (2016 2017 2018 2019 2020)
- CMBS OFF switch does not turn On/turn Off (CMBS indicator does not change) (Collision Mitigation Braking System) (2014 2015)
- CMBS OFF switch does not turn On/turn Off (CMBS indicator does not change) (Collision Mitigation Braking System) (2016 2017 2018 2019 2020)
- CMBS indicator does not come on (Collision Mitigation Braking System) (2014 2015)
- CMBS indicator does not come on (Collision Mitigation Braking System) (2016 2017 2018 2019 2020)
- CMBS indicator does not go off (Collision Mitigation Braking System) (2014 2015)
- CMBS indicator does not go off (Collision Mitigation Braking System) (2016 2017 2018 2019 2020)
- Cruise control can be set, but the cruise main indicator or the cruise control indicator do not come on (Cruise Control) (2014 2015 2016)
- Cruise control cannot be set (Cruise Control) (2014 2015 2016)
- Does not sense the vehicle driving ahead (Adaptive Cruise Control) (2014 2015)
- Does not sense the vehicle driving ahead (Adaptive Cruise Control) (2016 2017 2018 2019 2020)
- HDS does not communicate with the ACC unit or the vehicle (Collision Mitigation Braking System) (2014 2015)
- HDS does not communicate with the ACC unit (Adaptive Cruise Control) (2014 2015)
- HDS does not communicate with the LKAS camera/control unit (Lane Keeping Assist System) (2014 2015)
- Heads-up warning does not flash when the system is warning (FCW/LDW camera unit is ok) (Collision Mitigation Braking System) (2014 2015)
- Intermittently senses the vehicle driving ahead (Adaptive Cruise Control) (2014 2015)
- Intermittently senses the vehicle driving ahead (Adaptive Cruise Control) (2016 2017 2018 2019 2020)
- LKAS activation indicator (on the MID) does not come on (Lane Keeping Assist System) (2014 2015)
- LKAS activation indicator (on the MID) does not come on (Lane Keeping Assist System) (2016 2017 2018 2019 2020)
- LKAS activation indicator (on the MID) does not go off (Lane Keeping Assist System) (2014 2015)
- LKAS activation indicator (on the MID) does not go off (Lane Keeping Assist System) (2016 2017 2018 2019 2020)
- LKAS indicator (on the MID) does not come on (Lane Keeping Assist System) (2014 2015)
- LKAS indicator (on the MID) does not come on (Lane Keeping Assist System) (2016 2017 2018 2019 2020)
- LKAS indicator (on the MID) does not go off (Lane Keeping Assist System) (2014 2015)
- LKAS indicator (on the MID) does not go off (Lane Keeping Assist System) (2016 2017 2018 2019 2020)
- Light switch turned on, the cruise control combination switch illumination does not come on (Cruise Control) (2014 2015 2016)
- Senses a vehicle driving in another lane (Adaptive Cruise Control) (2014 2015)
- Senses a vehicle driving in another lane (Adaptive Cruise Control) (2016 2017 2018 2019 2020)
- Set distance cannot be adjusted with the distance switch (Adaptive Cruise Control) (2014 2015)
- Set distance cannot be adjusted with the distance switch (Adaptive Cruise Control) (2016 2017 2018 2019 2020)
- Set speed does not cancel when the MAIN switch is turned off (Adaptive Cruise Control) (2014 2015)
- Set speed does not cancel when the MAIN switch is turned off (Adaptive Cruise Control) (2016 2017 2018 2019 2020)
- Set speed does not cancel when the brake pedal is pressed (Adaptive Cruise Control) (2014 2015)
- Set speed does not cancel when the brake pedal is pressed (Adaptive Cruise Control) (2016 2017 2018 2019 2020)
- Set speed does not cancel when the brake pedal is pressed (Cruise Control) (2014 2015 2016)
- Set speed does not cancel when the cancel switch is pressed (Cruise Control) (2014 2015 2016)
- Set speed does not cancel when the cruise control main switch is pressed (Cruise Control) (2014 2015 2016)
- Set speed does not resume when the res/+ switch is pressed (with the cruise control main switch pressed on, and set speed temporarily canceled by pressing the brake pedal) (Cruise Control) (2014 2015 2016)
- The CMBS did not operate (Collision Mitigation Braking System) (2014 2015)
- The CMBS did not operate (Collision Mitigation Braking System) (2016 2017 2018 2019 2020)
- The CMBS operated without danger of collision (Collision Mitigation Braking System) (2014 2015)
- The CMBS operated without danger of collision (Collision Mitigation Braking System) (2016 2017 2018 2019 2020)
- The CMBS operates frequently (Collision Mitigation Braking System) (2014 2015)
- The CMBS operates frequently (Collision Mitigation Braking System) (2016 2017 2018 2019 2020)
- The MID does not indicate when the CMBS OFF switch is operated (Collision Mitigation Braking System) (2014 2015)
- The MID does not indicate when the CMBS OFF switch is operated (Collision Mitigation Braking System) (2016 2017 2018 2019 2020)
- The buzzer does not sound when the CMBS OFF switch is operated (Collision Mitigation Braking System) (2014 2015)
- The buzzer does not sound when the CMBS OFF switch is operated (Collision Mitigation Braking System) (2016 2017 2018 2019 2020)
- The buzzer does not sound (Collision Mitigation Braking System) (2014 2015)
- The buzzer does not sound (Collision Mitigation Braking System) (2016 2017 2018 2019 2020)
- Though CMBS operates, the information is not displayed on the MID (Collision Mitigation Braking System) (2016 2017 2018 2019 2020)
- Though CMBS operates, the information is not displayed on the MID. (Collision Mitigation Braking System) (2014 2015)
- Vehicle does not accelerate accordingly when the res/+ switch is pressed (Cruise Control) (2014 2015 2016)
- Vehicle does not decelerate or accelerate accordingly when the SET or RES switch is pressed (Adaptive Cruise Control) (2016 2017 2018 2019 2020)
- Vehicle does not decelerate or accelerate accordingly when the SET or RESUME switch is pressed (Adaptive Cruise Control) (2014 2015)
- Vehicle speed can be set, but there is no ACC indication on the MID (2016 2017 2018 2019 2020)
- Vehicle speed can be set, but there is no ACC indication on the MID (Adaptive Cruise Control) (2014 2015)
- Vehicle speed can be set, but vehicle decelerates (Adaptive Cruise Control) (2014 2015)
- Vehicle speed can be set, but vehicle decelerates (Adaptive Cruise Control) (2016 2017 2018 2019 2020)
- Vehicle speed cannot be set when the SET switch is pressed (between the 25 mph (40 km/h) and 90 mph (145 km/h)) (Adaptive Cruise Control) (2014 2015)
- Vehicle speed cannot be set when the SET switch is pressed (between the 25 mph (40 km/h) and 90 mph (145 km/h)) (Adaptive Cruise Control) (2016 2017 2018 2019 2020)
- DTC Troubleshooting Index
- Description
- Adaptive Cruise Control (ACC) System Description - Control/Function (2016 2017 2018 2019 2020)
- Adaptive Cruise Control (ACC) System Description - Overview (2014 2015)
- Adaptive Cruise Control (ACC) System Description - Overview (2016 2017 2018 2019 2020)
- Adaptive Cruise Control (ACC) System Description - System Diagram (2014 2015)
- Adaptive Cruise Control (ACC) System Description - System Diagram (2016 2017 2018 2019 2020)
- Collision Mitigation Braking System (CMBS) Description - Components
- Collision Mitigation Braking System (CMBS) Description - Control/Function
- Collision Mitigation Braking System (CMBS) Description - Overview (2014 2015)
- Collision Mitigation Braking System (CMBS) Description - Overview (2016 2017 2018 2019 2020)
- Collision Mitigation Braking System (CMBS) Description - System Diagram (2014 2015)
- Collision Mitigation Braking System (CMBS) Description - System Diagram (2016 2017 2018 2019 2020)
- Cruise Control System Description - Overview
- Cruise Control System Description - System Diagram
- Lane Keeping Assist System (LKAS) Description - Components (2014 2015 2016 2017 2018 2019)
- Lane Keeping Assist System (LKAS) Description - Control/Function (2014 2015 2016 2017 2018 2019)
- Lane Keeping Assist System (LKAS) Description - Overview (2014 2015)
- Lane Keeping Assist System (LKAS) Description - Overview (2016 2017)
- Lane Keeping Assist System (LKAS) Description - Overview (2018 2019 2020)
- Lane Keeping Assist System (LKAS) Description - System Diagram (2014 2015)
- Lane Keeping Assist System (LKAS) Description - System Diagram (2016 2017)
- Lane Keeping Assist System (LKAS) Description - System Diagram (2018 2019 2020)
- Adjustment
- Circuit Diagram
- Adaptive Cruise Control (ACC) Circuit Diagram (2014 2015)
- Adaptive Cruise Control (ACC) Circuit Diagram (2016 2017)
- Adaptive Cruise Control (ACC) Circuit Diagram (2018 2019 2020)
- Collision Mitigation Braking System (CMBS) Circuit Diagram (2014 2015)
- Collision Mitigation Braking System (CMBS) Circuit Diagram (2016 2017)
- Collision Mitigation Braking System (CMBS) Circuit Diagram (2018 2019 2020)
- Cruise Control Circuit Diagram
- Lane Keeping Assist System (LKAS) Circuit Diagram (2014 2015)
- Lane Keeping Assist System (LKAS) Circuit Diagram (2016 2017)
- Lane Keeping Assist System (LKAS) 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.