Problem Symptoms Table [09/2014 - 11/2017]
WARNING: This page is about a different car, the 2017 Lexus RC F, 2016 Lexus RC F, and 2015 Lexus RC F. However, it is still accessible from the selected car via links, so may be relevant.
HINT:
- Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
- Inspect the fuses and relays related to this system before inspecting the suspected areas below.
| Symptom | Suspected Area | Link |
|---|---|---|
| The cruise control system cannot be turned on using the cruise control switch (ON/OFF button) | Cruise control switch circuit | Refer to Cruise Control Switch Circuit [09/2014 - 11/2017] |
| Cruise main indicator light circuit | Refer to Cruise Main Indicator Light Circuit [09/2014 - 11/2017] | |
| ECM | Refer to REMOVAL [09/2014 - ] | |
| Vehicle speed cannot be set (The cruise control indicator illuminates when the cruise control system is turned on using the cruise control switch (ON/OFF button), but the cruise control indicator goes off when the cruise control switch is pushed to -/SET) | Cruise control switch circuit | Refer to Cruise Control Switch Circuit [09/2014 - 11/2017] |
| ECM | Refer to REMOVAL [09/2014 - ] | |
| Vehicle speed cannot be set (The cruise control indicator illuminates when the cruise control system is turned on using the cruise control switch (ON/OFF button), and it remains illuminated when the cruise control switch is pushed to -/SET) | Stop light switch circuit | Refer to DTC P0571: Brake Switch "A" Circuit [09/2014 - 11/2017] |
| Vehicle speed sensor circuit | Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 11/2017] | |
| Cruise control switch circuit | Refer to Cruise Control Switch Circuit [09/2014 - 11/2017] | |
| Transmission control switch circuit (for A760H) | Refer to Transmission Control Switch Circuit [09/2014 - ] | |
| Transmission control switch circuit (for AA81E) | Refer to Transmission Control Switch Circuit [09/2014 - ] | |
| Combination meter assembly | Refer to REMOVAL [09/2014 - ] | |
| ECM | Refer to REMOVAL [09/2014 - ] | |
| Vehicle speed control by the cruise control system is automatically canceled after it has started | Stop light switch circuit | Refer to DTC P0571: Brake Switch "A" Circuit [09/2014 - 11/2017] |
| Transmission control switch circuit (for A760H) | Refer to Transmission Control Switch Circuit [09/2014 - ] | |
| Transmission control switch circuit (for AA81E) | Refer to Transmission Control Switch Circuit [09/2014 - ] | |
| Cruise control switch circuit | Refer to Cruise Control Switch Circuit [09/2014 - 11/2017] | |
| Vehicle speed sensor circuit | Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 11/2017] | |
| Combination meter assembly | Refer to REMOVAL [09/2014 - ] | |
| ECM | Refer to REMOVAL [09/2014 - ] | |
| CAN communication system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 11/2017] | |
| Pulling back on the cruise control switch does not cancel vehicle speed control by the cruise control system (The cruise control indicator remains illuminated) | Cruise control switch circuit | Refer to Cruise Control Switch Circuit [09/2014 - 11/2017] |
| Combination meter assembly | Refer to REMOVAL [09/2014 - ] | |
| ECM | Refer to REMOVAL [09/2014 - ] | |
| Pulling back on the cruise control switch does not cancel vehicle speed control by the cruise control system (The cruise control indicator goes off) | ECM | Refer to REMOVAL [09/2014 - ] |
| Vehicle speed control by the cruise control system is not canceled when vehicle speed drops below the low speed limit (The cruise control indicator remains illuminated) | Vehicle speed sensor circuit | Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 11/2017] |
| ECM | Refer to REMOVAL [09/2014 - ] | |
| Combination meter assembly | Refer to REMOVAL [09/2014 - ] | |
| Vehicle speed control by the cruise control system is not canceled when vehicle speed drops below the low speed limit (The cruise control indicator goes off) | ECM | Refer to REMOVAL [09/2014 - ] |
| Depressing the brake pedal does not cancel vehicle speed control by the cruise control system (The cruise control indicator remains illuminated) | Stop light switch circuit | Refer to DTC P0571: Brake Switch "A" Circuit [09/2014 - 11/2017] |
| Combination meter assembly | Refer to REMOVAL [09/2014 - ] | |
| ECM | Refer to REMOVAL [09/2014 - ] | |
| Depressing the brake pedal does not cancel vehicle speed control by the cruise control system (The cruise control indicator goes off) | ECM | Refer to REMOVAL [09/2014 - ] |
| Moving the shift lever other than D does not cancel vehicle speed control by the cruise control system (The cruise control indicator remains illuminated) | Transmission control switch circuit (for A760H) | Refer to Transmission Control Switch Circuit [09/2014 - ] |
| Transmission control switch circuit (for AA81E) | Refer to Transmission Control Switch Circuit [09/2014 - ] | |
| Combination meter assembly | Refer to REMOVAL [09/2014 - ] | |
| ECM | Refer to REMOVAL [09/2014 - ] | |
| Moving the shift lever does not cancel vehicle speed control by the cruise control system (The cruise control indicator goes off) | ECM | Refer to REMOVAL [09/2014 - ] |
| Vehicle speed control by the cruise control system is not canceled when the paddle shift switch is operated to 3rd, 2nd or 1st range (The cruise control indicator remains illuminated) | Shift paddle switch circuit (for A760H) | Refer to Shift Paddle Switch Circuit [09/2014 - 11/2017] |
| Shift paddle switch circuit (for AA81E) | Refer to Shift Paddle Switch Circuit [09/2014 - 11/2017] | |
| Combination meter assembly | Refer to REMOVAL [09/2014 - ] | |
| ECM | Refer to REMOVAL [09/2014 - ] | |
| Vehicle speed control by the cruise control system is not canceled when the paddle shift switch is operated to 3rd, 2nd or 1st range (The cruise control indicator goes off) | ECM | Refer to REMOVAL [09/2014 - ] |
| Hunting (Speed is not constant) | Vehicle speed sensor circuit | Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 11/2017] |
| SFI system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - ] | |
| ECM | Refer to REMOVAL [09/2014 - ] | |
| The cruise control indicator remains blinking | TC and CG terminal circuit | Refer to TC and CG Terminal Circuit [09/2014 - 11/2017] |
| ECM | Refer to REMOVAL [09/2014 - ] | |
| The cruise control SET indicator does not illuminate (Vehicle speed can be set) | Cruise SET indicator circuit | Refer to Cruise SET Indicator Light Circuit [09/2014 - 11/2017] |
| ECM | Refer to REMOVAL [09/2014 - ] | |
| CAN communication system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 11/2017] | |
| Combination meter assembly | Refer to REMOVAL [09/2014 - ] |