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EXTERIOR LIGHTING SYSTEM T–17 T T Failure Detection Function • If the discharge headlight control unit input voltage (9—16 V) fails to maintain operational voltage (except for • The discharge headlight control unit turns the headlights back on at resumption of normal operational voltage. Abnormal output detection function • If there is an abnormality in the output system (detects an open or GND short circuit in harness), the discharge • If the discharge headlight control unit turns off the headlights due to an abnormality in the output system, the End Of Sie ON-BOARD DIAGNOSTIC FUNCTION A6E811201052T12 Outline • The on-board diagnostic function is incorporated into the discharge headlight control unit (LH) and discharge • The on-board diagnostic function consists of the following functions: a failure detection function, which detects • Using an SST (WDS or equivalent), DTCs can be read out and deleted, and the PID/data monitoring function Block Diagram . Self-Malfunction Diagnostic Function • The self-malfunction diagnostic function determines that there is a malfunction, and outputs a signal, as a DTC, Failure Detection Function • The failure detection function in each discharge headlight control unit detects malfunctions in input/output • This function outputs the DTC for the detected malfunction to the DLC-2, and also sends the detected result to Memory Function • The memory function stores the DTC for the malfunction of input/output signals for related parts, as determined End Of Sie 9 8 7 5 4 3 6 1 2 3 4 10 A6E8112T565 1 Front combination light (LH) 2 Front combination light (RH) 3 Discharge headlight bulb (low-beam) 4 Ignitor 5 Discharge headlight control unit (LH) 6 Discharge headlight control unit (RH) 7 LHID 8 RHID 9 DLC-2 10 SST (WDS or equivalent) |