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.
Cruise Control System - Testing & Troubleshooting (Except Hybrid)
2018 Acura ILXSECTION Cruise Control System - Testing & Troubleshooting (Except Hybrid)
- Circuit Diagram
- Adaptive Cruise Control (ACC) (2016 2017 2018)
- Adaptive Cruise Control (ACC) (2019 2020 2021 2022)
- Collision Mitigation Braking System (CMBS) (2016 2017 2018)
- Collision Mitigation Braking System (CMBS) (2019 2020 2021 2022)
- Cruise Control (2016 2017 2018)
- Cruise Control (K24Z7) (2013 2014 2015)
- Cruise Control (R20A5) (2013 2014 2015)
- Lane Keeping Assist System (LKAS) (2016 2017 2018)
- Lane Keeping Assist System (LKAS) (2019 2020 2021 2022)
- Symptom Troubleshooting
- Adaptive Cruise Control (ACC) - ACC activation indicator does not come on (2016 2017 2018 2019 2020 2021 2022)
- Adaptive Cruise Control (ACC) - ACC activation indicator does not go off (2016 2017 2018 2019 2020 2021 2022)
- Adaptive Cruise Control (ACC) - ACC indicator (on the MID) does not go off (2019 2020 2021 2022)
- Adaptive Cruise Control (ACC) - ACC indicator does not come on (2016 2017 2018 2019 2020 2021 2022)
- Adaptive Cruise Control (ACC) - ACC indicator does not go off (2016 2017 2018)
- Adaptive Cruise Control (ACC) - Does not sense the vehicle driving ahead (2016 2017 2018 2019 2020 2021 2022)
- Adaptive Cruise Control (ACC) - Intermittently senses the vehicle driving ahead (2016 2017 2018 2019 2020 2021 2022)
- Adaptive Cruise Control (ACC) - Senses a vehicle driving in another lane (2016 2017 2018 2019 2020 2021 2022)
- Collision Mitigation Braking System (CMBS) - CMBS indicator does not go off (2016 2017 2018 2019 2020 2021 2022)
- Lane Keeping Assist System (LKAS) - LKAS activation indicator (on the MID) does not come on (2016 2017 2018 2019 2020 2021 2022)
- Lane Keeping Assist System (LKAS) - LKAS activation indicator (on the MID) does not go off (2016 2017 2018 2019 2020 2021 2022)
- Lane Keeping Assist System (LKAS) - LKAS indicator (on the MID) does not come on (2016 2017 2018 2019 2020 2021 2022)
- Lane Keeping Assist System (LKAS) - LKAS indicator (on the MID) does not go off (2016 2017 2018)
- Lane Keeping Assist System (LKAS) - LKAS indicator (on the MID) does not go off (2019 2020 2021 2022)
- How to Information
- How to Troubleshoot the Adaptive Cruise Control (ACC) (2016 2017 2018 2019 2020 2021 2022)
- ACC Indicator (Amber)
- Multi-Information Display (MID) Indication
- Self-Diagnostic Function
- Multipurpose Camera Unit
- 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) (2016 2017 2018 2019 2020 2021 2022)
- How to Troubleshoot the Adaptive Cruise Control (ACC) (2016 2017 2018 2019 2020 2021 2022)
- System Description
- Adaptive Cruise Control (ACC) - Control/Function (2016 2017 2018 2019 2020 2021 2022)
- Adaptive Cruise Control (ACC) - Overview (2016 2017 2018 2019 2020 2021 2022)
- Adaptive Cruise Control (ACC) - System Diagram (2016 2017 2018 2019 2020 2021 2022)
- Collision Mitigation Braking System (CMBS) - Overview (2016 2017 2018 2019 2020 2021 2022)
- Collision Mitigation Braking System (CMBS) - System Diagram (2016 2017 2018 2019 2020 2021 2022)
- Cruise Control
- Cruise Control - Overview (2016 2017 2018 2019 2020 2021 2022)
- Cruise Control System - System Diagram (2016 2017 2018 2019 2020 2021 2022)
- Lane Keeping Assist System (LKAS) - Overview (2016 2017 2018 2019 2020 2021 2022)
- Lane Keeping Assist System (LKAS) Description - System Diagram (2016 2017 2018 2019 2020 2021 2022)
- Symptom Troubleshooting Index
- Adaptive Cruise Control (ACC) Symptom Troubleshooting Index(Adaptive Cruise Control (ACC)) (2016 2017 2018 2019 2020 2021 2022)
- Collision Mitigation Braking System (CMBS) Symptom Troubleshooting Index(Collision Mitigation Braking System (CMBS)) (2016 2017 2018 2019 2020 2021 2022)
- Cruise Control Symptom Troubleshooting Index(Cruise Control) (2016 2017 2018)
- Cruise Control Symptom Troubleshooting Index(K24Z7) (2013 2014 2015)
- Cruise Control Symptom Troubleshooting Index(R20A5) (2013 2014 2015)
- Lane Keeping Assist System (LKAS) Symptom Troubleshooting Index (2016 2017 2018 2019 2020 2021 2022)
- Input Test
- Component Location Index
- Adaptive Cruise Control (ACC) (2016 2017 2018 2019 2020 2021 2022)
- Collision Mitigation Braking System (CMBS) (2016 2017 2018 2019 2020 2021 2022)
- Cruise Control (2013 2014 2015)
- Cruise Control (2016 2017 2018 2019 2020 2021 2022)
- Cruise Control (R20A5) (2013 2014 2015)
- Lane Keeping Assist System (LKAS) (2016 2017 2018 2019 2020 2021 2022)
- Test
- Symptom Troubleshooting Index for Viewer
- ACC OFF is displayed on the MID unexpectedly(Adaptive Cruise Control (ACC)) (2016 2017 2018 2019 2020 2021 2022)
- ACC activation indicator does not come on(Adaptive Cruise Control (ACC)) (2016 2017 2018 2019 2020 2021 2022)
- ACC activation indicator does not go off(Adaptive Cruise Control (ACC)) (2016 2017 2018 2019 2020 2021 2022)
- ACC indicator does not come on(Adaptive Cruise Control (ACC)) (2016 2017 2018 2019 2020 2021 2022)
- ACC indicator does not go off(Adaptive Cruise Control (ACC)) (2016 2017 2018 2019 2020 2021 2022)
- CMBS OFF switch does not turn On/turn Off (CMBS indicator does not change) (Collision Mitigation Braking System (CMBS)) (2016 2017 2018 2019 2020 2021 2022)
- CMBS indicator does not come on(Collision Mitigation Braking System (CMBS)) (2016 2017 2018 2019 2020 2021 2022)
- CMBS indicator does not go off(Collision Mitigation Braking System (CMBS)) (2016 2017 2018 2019 2020 2021 2022)
- Cruise control can be set, but the cruise control indicator does not come on(Cruise Control) (2016 2017 2018)
- Cruise control can be set, but the cruise control indicator does not come on(K24Z7) (2013 2014 2015)
- Cruise control can be set, but the cruise control indicator does not come on(R20A5) (2013 2014 2015)
- Cruise control can be set, but the cruise main indicator does not come on(Cruise Control) (2016 2017 2018)
- Cruise control can be set, but the cruise main indicator does not come on(K24Z7) (2013 2014 2015)
- Cruise control can be set, but the cruise main indicator does not come on(R20A5) (2013 2014 2015)
- Cruise control cannot be set(Cruise Control) (2016 2017 2018)
- Cruise control cannot be set(K24Z7) (2013 2014 2015)
- Cruise control cannot be set(R20A5) (2013 2014 2015)
- Does not sense the vehicle driving ahead(Adaptive Cruise Control (ACC)) (2016 2017 2018 2019 2020 2021 2022)
- Intermittently senses the vehicle driving ahead(Adaptive Cruise Control (ACC)) (2016 2017 2018 2019 2020 2021 2022)
- LKAS activation indicator (on the MID) does not come on (2016 2017 2018 2019 2020 2021 2022)
- LKAS activation indicator (on the MID) does not go off (2016 2017 2018 2019 2020 2021 2022)
- LKAS indicator (on the MID) does not come on (2016 2017 2018 2019 2020 2021 2022)
- LKAS indicator (on the MID) does not go off (2016 2017 2018 2019 2020 2021 2022)
- Light switch turned on, the cruise control combination switch illumination does not come on(Cruise Control) (2016 2017 2018)
- Light switch turned on, the cruise control combination switch illumination does not come on(K24Z7) (2013 2014 2015)
- Light switch turned on, the cruise control combination switch illumination does not come on(R20A5) (2013 2014 2015)
- Senses a vehicle driving in another lane(Adaptive Cruise Control (ACC)) (2016 2017 2018 2019 2020 2021 2022)
- Set distance cannot be adjusted with the distance switch(Adaptive Cruise Control (ACC)) (2016 2017 2018 2019 2020 2021 2022)
- Set speed does not cancel (engine rpm stays high) when the clutch pedal is pressed(K24Z7) (2013 2014 2015)
- Set speed does not cancel when the CANCEL button is pressed(Cruise Control) (2016 2017 2018)
- Set speed does not cancel when the CRUISE/MAIN button is pressed(Cruise Control) (2016 2017 2018)
- Set speed does not cancel when the MAIN switch is turned off(Adaptive Cruise Control (ACC)) (2016 2017 2018 2019 2020 2021 2022)
- Set speed does not cancel when the brake pedal is pressed(Adaptive Cruise Control (ACC)) (2016 2017 2018 2019 2020 2021 2022)
- Set speed does not cancel when the brake pedal is pressed(Cruise Control) (2016 2017 2018)
- Set speed does not cancel when the brake pedal is pressed(K24Z7) (2013 2014 2015)
- Set speed does not cancel when the brake pedal is pressed(R20A5) (2013 2014 2015)
- Set speed does not cancel when the cancel button is pressed(K24Z7) (2013 2014 2015)
- Set speed does not cancel when the cancel button is pressed(R20A5) (2013 2014 2015)
- Set speed does not cancel when the cruise control main button is pressed(K24Z7) (2013 2014 2015)
- Set speed does not cancel when the cruise control main button is pressed(R20A5) (2013 2014 2015)
- Set speed does not resume when the RES ACCEL button is pressed (with the CRUISE/MAIN button pressed on, and set speed temporarily canceled by pressing the brake pedal) (Cruise Control) (2016 2017 2018)
- Set speed does not resume when the res/accel button is pressed (with the cruise control main button pressed on, and set speed temporarily canceled by pressing the brake pedal) (K24Z7) (2013 2014 2015)
- Set speed does not resume when the res/accel button is pressed (with the cruise control main button pressed on, and set speed temporarily canceled by pressing the brake pedal) (R20A5) (2013 2014 2015)
- Set speed does not resume when the resume/accel button is pressed (with the cruise control main switch turned on, and set speed temporarily canceled by pressing the clutch pedal) (K24Z7) (2013 2014 2015)
- The CMBS did not operate(Collision Mitigation Braking System (CMBS)) (2016 2017 2018 2019 2020 2021 2022)
- The CMBS operated without danger of collision(Collision Mitigation Braking System (CMBS)) (2016 2017 2018 2019 2020 2021 2022)
- The CMBS operates frequently(Collision Mitigation Braking System (CMBS)) (2016 2017 2018 2019 2020 2021 2022)
- The MID does not indicate when the CMBS OFF switch is operated(Collision Mitigation Braking System (CMBS)) (2016 2017 2018 2019 2020 2021 2022)
- The buzzer does not sound when the CMBS OFF switch is operated(Collision Mitigation Braking System (CMBS)) (2016 2017 2018 2019 2020 2021 2022)
- The buzzer does not sound(Collision Mitigation Braking System (CMBS)) (2016 2017 2018 2019 2020 2021 2022)
- Though CMBS operates, the information is not displayed on the MID(Collision Mitigation Braking System (CMBS)) (2016 2017 2018 2019 2020 2021 2022)
- Vehicle does not accelerate accordingly when the RES ACCEL button is pressed(Cruise Control) (2016 2017 2018)
- Vehicle does not accelerate accordingly when the res/accel button is pressed(K24Z7) (2013 2014 2015)
- Vehicle does not accelerate accordingly when the res/accel button is pressed(R20A5) (2013 2014 2015)
- Vehicle does not decelerate or accelerate accordingly when the SET/- or RES/+ switch is pressed(Adaptive Cruise Control (ACC)) (2016 2017 2018 2019 2020 2021 2022)
- Vehicle speed can be set, but there is no ACC indication on the MID(Adaptive Cruise Control (ACC)) (2016 2017 2018 2019 2020 2021 2022)
- Vehicle speed can be set, but vehicle decelerates(Adaptive Cruise Control (ACC)) (2016 2017 2018 2019 2020 2021 2022)
- 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 (ACC)) (2016 2017 2018 2019 2020 2021 2022)
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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.