Lexus ES: Fail-safe Chart
FAIL-SAFE CHART
FAIL-SAFE FUNCTION
(a) If a malfunction is detected in the parking support brake system, the warning message "Parking Support Brake Malfunction Visit Your Dealer", "Parking Support Brake Unavailable" or "Parking Support Brake Unavailable Remove the Dirt of Rear Camera", is displayed on the multi-information display, the PKSB OFF indicator blinks and the parking support brake system control is prohibited as necessary.
(b) If the clearance warning ECU assembly judges that there is foreign matter on an ultrasonic sensor or detection of objects is not possible in severe weather such as snow, the warning message "Parking Support Brake Unavailable" is displayed, the PKSB OFF indicator blinks and control is canceled. The warning message "Parking Support Brake Unavailable" is temporarily displayed and turns off. The PKSB OFF indicator blinks to inform the driver of the malfunction. When detection of an obstacle is possible, the PKSB OFF indicator turns off and the parking support brake system control returns to normal.
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How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Use the following procedure to troubleshoot the parking support brake system.
*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
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Operation Check
OPERATION CHECK PKSB OFF INDICATOR LIGHT OPERATION CHECK (a) Turn the engine switch on (IG). (b) Turn the parking support brake system off and confirm that the PKSB OFF indicator in the combination me
Parts Location
PARTS LOCATION ILLUSTRATION *1 FRONT CORNER ULTRASONIC SENSOR RH *2 FRONT CENTER ULTRASONIC SENSOR RH *3 FRONT CENTER ULTRASONIC SENSOR LH *4 FRONT CORNER ULTRASONIC SENSOR LH
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Pressure Control Solenoid "C" Circuit Short to Ground or Open (P079514)
DESCRIPTION Refer to DTC P079512. Click here DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note P079514 Pressure Control Solenoid "C" Circuit Short to Ground or Open While the vehicle is being driven so that gear changes occur, a short to ground or o
Lost Communication with Power Source Control (B278C)
DESCRIPTION When an internal malfunction is detected in the certification ECU (smart key ECU assembly), this DTC is stored. DTC No. Detection Item DTC Detection Condition Trouble Area B278C Lost Communication with Power Source Control An internal malfunction occurs in the certificat
