Lighting System (Diagnostics - Introduction): Other Lexus IS II facelift 2

PRECAUTION [08/2012 - ]

1. PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL NOTE: When disconnecting the cable from the negative (-) battery terminal, initialize the following system after the cable is reconnected. System Name See Procedure Parking Assist Monitor System Refer to «INITIALIZATION [08/2012 - ]»(ref-606329-S33601054862014032500000)
2. 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 22, 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 inputs for the different systems mentioned in the service 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 Techstream.

CUSTOMIZE PARAMETERS [08/2012 - ]

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

LIGHT CONTROL

HINT

The sensitivity adjustment may be difficult to confirm. Check by driving the customer's vehicle.

FAIL-SAFE CHART [08/2012 - ]

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 Detection of Abnormal Input Voltage If voltage that is input to the light control ECU deviates from the operating voltage range (9 to 16 V), the ECU stops illuminating the headlights, and resumes illuminating the headlights once the voltage reverts to the operating voltage range However, if input voltage decreases after the headlights have illuminated, the headlights will remain illuminated as long as possible Detection of Abnormal Output (Open or Short Circuit) If an abnormal condition (open or short circuit) occurs in voltage that is output by the light control ECU, the ECU stops illuminating the headlights and will maintain this state until power is reinstated (by turning the headlight control switch off and then on again) Detection of Abnormal Output Voltage to Headlights (too high or too low) If an abnormal condition (too high or too low) occurs in voltage that is output to the headlights by the light control ECU, the ECU stops illuminating the headlights and will maintain this state until power is reinstated (by turning the headlight control switch off and then on again) Headlight leveling ECU assembly The headlight leveling ECU assembly operates in fail-safe mode if an abnormal condition such as those listed below has been detected, and indicates the automatic headlight beam level control system warning in the multi-information display. Item Abnormality Detection Condition Leveling Motor Control Return Condition Warning Speed sensor Open or short in the right front speed sensor Open or short in the left front speed sensor Continues operating using the normally functioning sensor if one sensor is abnormal. Continues operating on the basis that the vehicle is stationary if both sensors are abnormal. Engine switch turned on (IG) again Displayed Height control sensor power source Short Holds at the current position if its position is lower than the initial set position. Returns to its initial set position and stops, if its position is higher than the initial set position. Normal value is detected Displayed Front height control sensor Open Short Holds at the current position if its position is lower than the initial set position. Returns to its initial set position and stops, if its position is higher than the initial set position. Normal value is detected Displayed Rear height control sensor Open Short Holds at the current position if its position is lower than the initial set position. Returns to its initial set position and stops, if its position is higher than the initial set position. Normal value is detected Displayed Headlight leveling motor LH Open Short Overheat Holds at the current position if its position is lower than the initial set position. Returns to its initial set position and stops, if its position is higher than the initial set position. Normal value is detected Displayed Headlight leveling motor RH Open Short Overheat Holds at the current position if its position is lower than the initial set position. Returns to its initial set position and stops, if its position is higher than the initial set position. Normal value is detected Displayed Generator L terminal Generator L terminal level is low (voltage is low) Continues normal control Engine switch turned on (IG) again Displayed Pitch angle (nose-up or nose-down vehicle posture) Out of range pitch angle is detected Holds at the current position if its position is lower than the initial set position. Returns to its initial set position and stops, if its position is higher than the initial set position. Normal range pitch angle is detected Displayed