AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM FAIL-SAFE CHART


  1. Automatic Headlight Beam Level Control System

    If the headlight leveling ECU assembly detects a malfunction in the automatic headlight beam level control system, it will indicate the malfunction and perform fail-safe control as indicated in the table below.

    Item Abnormality Detection Condition Fail-safe Control DTC Output Warning Light Return Condition
    Headlight leveling motor high input voltage High input voltage (more than 18.5 V)is detected. Headlight leveling motor will be stopped. - - Normal input voltage (below 17.5 V) is detected.
    Headlight leveling motor low input voltage Low input voltage (below 9 V) is detected. Headlight leveling motor will be stopped. - - Normal input voltage (more than 9.3 V) is detected.
    Height control sensor abnormal input voltage Abnormal input voltage (below 4.60 V, more than 6.25 V) is detected. Headlight leveling motor will be stopped. B2416 Illuminates Normal input voltage (4.61 to 6.24 V) is detected.
    Height control sensor abnormal signal voltage Abnormal signal voltage (below 0.25 V, more than 4.75 V) is detected. Headlight leveling motor will be stopped. B241A Illuminates Normal signal voltage (0.26 to 4.74 V) is detected.
    Speed sensor abnormal signal Abnormal wheel speed sensor signal

    • If either of the front wheel speed signals is abnormal, control continues using the normal signal.

    • If both of the front wheel speed signals are abnormal, judgment is performed as though the vehicle is stationary and control continues.

    		 B2415 - Normal signal is detected.
    CAN communication (skid control ECU) Skid control ECU communication error (vehicle speed signal)

    • If the leveling motor is not actuating, stops the abnormal headlight leveling motor at the current position.

    • If the leveling motor is actuating, stops the abnormal headlight leveling motor after actuating for 17 seconds.

    		 U0129 - Normal signal is detected.
    CAN communication (main body ECU (multiplex network body ECU)) Main body ECU (multiplex network body ECU) communication error (headlight signal)

    • If the leveling motor is not actuating, stops the abnormal headlight leveling motor at the current position.

    • If the leveling motor is actuating, stops the abnormal headlight leveling motor after actuating for 17 seconds.

    		 U0142 - Normal signal is detected.
    Main body ECU (multiplex network body ECU) communication error (destination information, VAST request, time stamp) -
    CAN communication (hybrid vehicle control ECU assembly) Hybrid vehicle control ECU assembly communication error (power source signal, transmission information) - U0100 - Headlight leveling ECU assembly is replaced.
    Headlight leveling ECU (CAN communication) Headlight leveling ECU internal error System does not perform control. U1000 - Headlight leveling ECU assembly is replaced.
    ROM error Stored data broken is detected. System does not perform control. B2420 Illuminates Headlight leveling ECU assembly is replaced.
    Invalid data (destination information) Invalid destination information is detected. System does not perform control. B2453 Illuminates Synchronization is completed.
    Invalid data (initialization of height control sensor) Abnormal height sensor data at initialization System does not perform control. B2452 Illuminates Initialization is completed after power switch off to on (IG).