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.
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HOMESERVICE MANUALSLEXUS2012IS 250C V6-2.5L (4GR-FSE)REPAIR AND DIAGNOSISCRUISE CONTROLTESTING AND INSPECTIONINITIAL INSPECTION AND DIAGNOSTIC OVERVIEWDYNAMIC RADAR CRUISE CONTROL SYSTEMOPERATION CHECK
2012 Lexus IS 250C V6-2.5L (4GR-FSE)
Operation Check
2012 Lexus IS 250C V6-2.5L (4GR-FSE)SECTION Operation Check
CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: OPERATION CHECK
1. INPUT SIGNAL CHECK
(a) Connect the Techstream to the DLC3.
Text in Illustration
(b) Check the cruise control main switch using the Data List function in the Techstream (ON-OFF, CANCEL, -SET and + RES).
2. INSPECT MODE SWITCH
(a) Turn the engine switch on (IG).
Text in Illustration
(b) Turn the cruise control main switch on. Then push the main switch to MODE for 1 second or more to change to the constant speed control mode. Check that RADAR READY indicator goes off.
NOTICE:
Do not push any other switches before pushing the main switch to MODE. If another switch is pushed, turn the main switch off and repeat the procedure above.
HINT
If a malfunction is detected, turn the engine switch off and repeat the procedure above.
3. INSPECT STEERING PAD SWITCH ASSEMBLY
(a) Turn the engine switch on (IG).
(b) Turn the cruise control main switch on.
(c) Turn on the distance control switch of the steering pad switch.
(d) Check that the indication of the vehicle-to-vehicle distance, which is shown on the multi-information display on the combination meter assembly, changes from long to middle to short in that order.
Text in Illustration
HINT
The indication is automatically set to long each time the engine is started.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.