Diagnosis System
WARNING: This page is about a different car, the 2009 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.
- DIAGNOSIS FUNCTION
- The diagnosis function makes the master warning light and the multi-information display come on, and the CRUISE main indicator light blinks as shown in the illustration. When a malfunction occurs in the dynamic radar cruise control system, the DTCs are stored in the ECM.
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NOTE:- The master warning light goes off if the system returns to normal condition.
- Since the stored data in the ECM is cleared by disconnecting the EFI and ETCS fuses or the battery terminal, do not disconnect them until the inspection has been completed.
- The diagnosis function makes the master warning light and the multi-information display come on, and the CRUISE main indicator light blinks as shown in the illustration. When a malfunction occurs in the dynamic radar cruise control system, the DTCs are stored in the ECM.
- DESCRIPTION
- The ECM controls the dynamic radar cruise control system of the vehicle. The data and DTCs relating to the dynamic radar cruise control system can be read from the DLC3 of the vehicle. If either DTC or CRUISE OK is not displayed on the multi-information display on the combination meter when checking for DTCs, there may be a problem with either the combination meter or the CAN communication and multiplex communication systems. Use the Techstream to check and solve the problem.
- CHECK DLC3
- Check the DLC3. Refer to GENERAL INFORMATION .
- CHECK INDICATOR
- Turn the engine switch on (IG).
- Check that the CRUISE main indicator light and RADAR READY indicator come on when the main switch ON-OFF button is pushed on, and that the indicator light and the indicator go off when the ON-OFF button is pushed off.
HINT:
- If the indicator check result shows a problem, proceed to troubleshooting for the combination meter section.
- If a malfunction occurs in the vehicle speed sensors, the stop light switch, or other related parts during cruise control driving, the ECU actuates AUTO CANCEL of the cruise control and blinks the CRUISE main indicator light. This indicator light informs the driver of the malfunction. At the same time, the malfunction is stored as a diagnostic trouble code.