Lighting: Other Lexus IS II

PRECAUTION

Note. When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the cable is reconnected.

SYSTEM NAME DESCRIPTION

1. PRECAUTION OF HEADLIGHT BULB REPLACEMENT When any defect such as deformation, cracks, dents, chipping, etc. is identified on the discharge headlight (especially, on the light control ECU), replace it with a new one. Even if the operation seems to be normal, the fail-safe function may be defective. Since bulbs of the discharge headlight and halogen bulbs (for headlight and fog light) have pressurized gas inside and can easily be broken if scratched or dropped, special care should be taken. When handling the bulb, hold the plastic or metal part and do not touch the glass part with bare hands. Never touch the high voltage socket of the discharge headlight with the headlight dimmer switch ON, as this could generate 20,000 V and lead to a serious accident. Never connect a tester to the high voltage socket of the discharge headlight for measurement, as this may lead to a serious accident because of high voltage. When performing operations related to the discharge headlight, keep it away from water such as rain, turn off the light control switch, and disconnect the cable from the negative (-) battery terminal and the connector of the light control ECU in advance to avoid electric shock. When performing operations related to the discharge headlight, operate it after assembling has been finished and never operate it without a bulb installed. Only illuminate the discharge headlight using the vehicle's power source.

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Various switches or sensors are represented as being inputs for the different systems mentioned in the information. Where direct electrical connections do not exist between components, signals may be carried across the different networks (BEAN, CAN) that exist on the vehicle. If a signal needs to travel from the CAN network to the BEAN network, the Gateway ECU allows the signal to travel between these different networks. Some of these different signals can be confirmed or inspected using the Intelligent Tester.

CUSTOMIZE PARAMETERS

HINT

The followings are the possible items to be customized.

Note. After confirming whether the items of the customer's request is applicable or not for the customized items, perform the customize operation. Be sure to record the current value before customizing. In case of performing the troubleshooting, pay attention as there is a possibility that the function is OFF by customizing. (Example: In case of the symptom in which "The wireless operation does not function", check that the wireless operation is not OFF by customizing, then perform the troubleshooting.)

ILLUMINATED ENTRY

ILLUMINATED ENTRY REFERENCE

LIGHT CONTROL

LIGHT CONTROL REFERENCE

HINT

Sensitivity adjustment can hardly be confirmed. Check by driving the customer's vehicle.

Illustration *1

ILLUSTRATION REFERENCE

FAIL-SAFE CHART

1. FAIL-SAFE Light control ECU The light control ECU executes the fail-safe actions listed below in accordance with the item that has been detected. ITEM OUTLINE Item Outline Detection of Abnormal Input Voltage If voltage that is input to light control ECU deviates from operating voltage (9 to 16 V), ECU stops illuminating headlights, and resumes illuminating headlight once the voltage reverts to the operating voltage range However, if input voltage decreases after headlights have illuminated, headlight will remain illuminated until the bulbs are extinguished Detection of Abnormal Output (open or short circuit) or Flashing Bulb If abnormal condition (open or short circuit) occurs in voltage that is output by light control ECU, or if bulb flashes, ECU stops illuminating headlights and will maintain this state until power is reinstated (by turning headlight control switch from ON or OFF) Detection of Bulb Open If bulb is not inserted in its socket, ECU stops generating high voltage until bulb is inserted correctly and power is reinstated (by turning headlight control switch from OFF to ON or turning engine switch from off to on (IG)) AFS ECU HINT: If a malfunction is detected, the headlight swivel ECU assembly (AFS ECU) performs fail-safe operation. Depending on the malfunction, the ECU flashes at 1 Hz intervals or illuminates the AFS OFF indicator in the combination meter assembly. Warning massages are also shown on the multi-information display. AFS ECU ITEM Item Detection Condition Leveling motor control Swivel motor control Operation restore condition Indicator Swivel motor (motor) Open Short Overheat Continues with the right and left leveling motor positions lowered by 0.8° from the current position. The normal swivel motor returns to the front position. The abnormal swivel motor stops at the current position. IG ON cycled Blinks Gear malfunction IG ON cycled Position change is detected Stop position error IG ON cycled Normal stop position is detected Swivel motor (sensor) Open Short Continues Returns to the front position. IG ON cycled Normal stop position is detected Blinks Steering angle sensor Trouble information is received Communication error Continues with the right and left leveling motors lowered from the current position by 0.8°. Continues after the swivel motor returns to the front position. Stops at the current position and then returns to the front position. IG ON cycled Normal stop position is detected Blinks Speed sensor Open Short Continues using the normal vehicle speed signal that is supplied by the skid control ECU if one sensor is malfunctioning. Continues determining that the vehicle is stationary if both sensors are malfunctioning. If one sensor is malfunctioning, the swivel motor is controlled using the normal vehicle speed signal that is supplied by the skid control ECU, and the motor returns to the front position. If both sensors are malfunctioning, the motor returns to the front position. IG ON cycled Blinks Height control sensor Open Short Pitch angle error Power source trouble If the height position is higher than the initial position, the leveling motor is returned to the initial position. If the leveling motor position is lower than its initial position, the leveling motor stays at the current position. Returns to the front position. IG ON cycled Normal stop position is detected Blinks Leveling motor Open Short Overheat The abnormal leveling motor stops at the current position. The normal leveling motor returns to its initial position if its current position is higher than the initial position. The normal leveling motor will stop at the current position if this position is lower than the initial position. Returns to the front position. IG ON cycled Blinks BEAN communication Interruption of headlight signal communication Interruption of headlight signal from the Windshield Wiper Switch assembly Interruption of steering sensor zero-point signal Interruption of front wheel speed signal communication Continues Returns to the front position. Signal is no longer interrupted. Blinks Interruption of AFS OFF switch signal Illuminates Interruption of engine speed signal communication Interruption of vehicle speed communication Continues Blinks AFS ECU ECU internal malfunction Continues Continues IG ON cycled Goes off Wheel speed data error Abnormal front wheel speed signal is received from the skid control ECU Continues Returns to the front position. Normal signal is received Blinks