- Open in output side circuit
- Short between output terminal and body ground
- Short between output terminals (Hi and Lo)
Lexus NX: Fail-safe Chart
Lexus NX Service Manual / Vehicle Exterior / Lighting (ext) / Lighting System (for Single Beam Headlight) / Fail-safe Chart
FAIL-SAFE CHART
LED HEADLIGHT SYSTEM
The headlight assembly (light control LED ECU) operates in fail-safe mode if any of the following abnormalities are detected.
| Item | Abnormality Detection Condition | Return Condition | Multi-information Display |
|---|---|---|---|
| Abnormal input voltage (High input voltage) | Abnormal power source voltage (more than 17 V) is detected. | Normal power source voltage (10 to 16 V) is detected. | "Headlight System Malfunction Visit Your Dealer" is displayed |
| Abnormal input voltage (Low input voltage)* | Power source voltage is low (8.5 to 10 V) and LED output current is limited. (Headlights will remain illuminated.) | Normal power source voltage (10 to 16 V) is detected. | "Headlight System Malfunction Visit Your Dealer" is displayed |
| Power source voltage is low (below 6 V). (Headlight operation is stopped) | Power source voltage of 8.5 V or more is detected | ||
| Abnormal output | | Light control switch is turned from off to head position. | "Headlight System Malfunction Visit Your Dealer" is displayed |
- *: When the headlights are on and the input voltage is between 6 and 10 V, the headlights dim.
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Data List / Active Test
DATA LIST / ACTIVE TEST NOTICE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faul
Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART Lighting System DTC No. Detection Item Link B1244 Light Sensor Circuit Malfunction B2430 LED Headlight LH Circuit Malfunction B2431 LED
Vehicle Control History
VEHICLE CONTROL HISTORY CHECK THE VEHICLE CONTROL HISTORY (LIGHTING SYSTEM) HINT:
The vehicle control history data (lighting system) stores the history of the reject function and system protection
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Operation Check
OPERATION CHECK CHECK SLIDING ROOF NOTICE:
If the negative battery terminal is disconnected under the following conditions, initialization of the sliding roof drive gear sub-assembly may not be completed. In this case, perform initialization.
Within 2 seconds after roof glass operation stops.
If the electronic key does not operate
properly
If communication between the
electronic key and vehicle is interrupted or the electronic
key cannot be used because the
battery is depleted, the smart
access system with push-button
start and wireless remote control
cannot be used. In such cases, the
doors can be opened and the hybrid
system
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