Auto Headlight Beam Level Control System (Diagnostics - Introduction): Other Lexus IS III

PRECAUTION [04/2013 - ]

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 See Procedure Air Conditioning System Refer to «INITIALIZATION [04/2013 - ]»(ref-665529-S01115916402014102400000) Variable Gear Ratio Steering System

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CAUTION / NOTICE / HINT

HINT

1. Use the following procedure to troubleshoot the automatic headlight beam level control system.
2. *: Use the Techstream.

PROCEDURE

1. VEHICLE BROUGHT TO WORKSHOP Result Proceed to NEXT Result: 1 NEXT See step 2
2. CUSTOMER PROBLEM ANALYSIS AND SYMPTOM CHECK Result Proceed to NEXT Result: 1 NEXT See step 3
3. INSPECT BATTERY VOLTAGE Measure the battery voltage. Standard Voltage 11 to 14 V If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step. Result Proceed to NEXT Result: 1 NEXT See step 4
4. INSPECT CAN COMMUNICATION SYSTEM Use the Techstream to check if the CAN communication system is functioning normally. Refer to «DIAGNOSIS SYSTEM [04/2013 - ]»(ref-665810-S14264089842014102400000) Result Result Proceed to CAN communication system DTCs are not output. A CAN communication system DTCs are output. B Result: 2 B GO TO CAN COMMUNICATION SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665785-S15342612202014102400000) Result: 1 A See step 5
5. CHECK FOR DTC* Check for DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665568-S31318337792014102400000) Body Electrical > HL AutoLeveling > Trouble Codes Result Result Proceed to DTCs are not output. A DTCs are output. B Result: 2 B GO TO DIAGNOSTIC TROUBLE CODE TABLE. Refer to «DIAGNOSTIC TROUBLE CODE TABLE [04/2013 - ]»(ref-665568-S34440038932014102400000) Result: 1 A See step 6
6. PROBLEM SYMPTOMS TABLE Refer to Problem Symptoms Table. Refer to «PROBLEM SYMPTOMS TABLE [04/2013 - ]»(ref-665568-S33653217242014102400000) Result Result Proceed to Fault is not listed in Problem Symptoms Table. A Fault is listed in Problem Symptoms Table. B Result: 2 B GO TO PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE [04/2013 - ]»(ref-665568-S33653217242014102400000) Result: 1 A See step 7
7. OVERALL ANALYSIS AND TROUBLESHOOTING* Data List/Active Test Refer to «DATA LIST/ACTIVE TEST [04/2013 - ]»(ref-665568-S18017238912014102400000) Terminals of ECU Refer to «TERMINALS OF ECU [04/2013 - ]»(ref-665568-S21334612802014102400000) Inspection Result Proceed to NEXT Result: 1 NEXT See step 8
8. ADJUST, REPAIR OR REPLACE Result Proceed to NEXT Result: 1 NEXT See step 9
9. CONFIRMATION TEST Result Proceed to NEXT Result: 1 NEXT END

INITIALIZATION [04/2013 - ]

Note. Synchronize the vehicle information when the headlight leveling ECU assembly is replaced with a new one. Initialize the headlight leveling ECU assembly when the headlight leveling ECU assembly is replaced. Initialize the headlight leveling ECU assembly (set the zero point of the height control sensor in the headlight leveling ECU assembly) after the vehicle height changes due to replacement of suspension components or after performing operations such as removal and reinstallation or replacement of the rear height control sensor sub-assembly. Adjust the headlight aim after initializing the headlight leveling ECU assembly. for HID Headlight: Refer to ADJUSTMENT [04/2013 - ] for LED Headlight: Refer to ADJUSTMENT [04/2013 - ] When a malfunction is detected in the automatic headlight beam level control system, rear height control sensor sub-assembly signal initialization is impossible. Perform troubleshooting before initialization.

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1. SYNCHRONIZE VEHICLE INFORMATION When using the Techstream: Turn the engine switch off. Connect the Techstream to the DLC3. Turn the engine switch on (IG), and check that the headlight leveling warning light continuously blinks at 0.5 Hz. *a Headlight Leveling Warning Light Enter the following menus: Body Electrical / HL AutoLeveling / Utility / ECU Information Sync. Body Electrical > HL AutoLeveling > Utility Tester Display ECU Information Sync Check what is displayed on the screen of the Techstream and press "Next". Check that the headlight leveling warning light continuously blinks 6 times at 2 Hz. Press "Exit" and turn the engine switch off. NOTE: After synchronizing vehicle information, initialize the headlight leveling ECU assembly. When not using the Techstream: Turn the engine switch on (IG), and check that the headlight leveling warning light continuously blinks at 0.5 Hz. *a Headlight Leveling Warning Light Turn the low beam headlights on and off 8 times using the light control switch within 20 seconds after turning the engine switch on (IG). NOTE: Turn the low beam headlights on and off at less than 2-second intervals. HINT: If the light control switch operation cannot be finished within 20 seconds, turn the engine switch off. Then, turn the engine switch on (IG) and restart the procedure. Check that the headlight leveling warning light continuously blinks 6 times at 2 Hz. Turn the engine switch off. NOTE: After synchronizing vehicle information, initialize the headlight leveling ECU assembly.
2. HEADLIGHT LEVELING ECU ASSEMBLY INITIALIZATION Prepare vehicle for initialization Unload the trunk and vehicle, ensuring that the spare tire, tools and jack are in their original positions. Check that there are no occupants in the vehicle. Turn off the headlights. Stop the vehicle on a level surface and keep the vehicle height unchanged. Check headlight leveling warning light *a Headlight Leveling Warning Light Turn the engine switch on (IG), and check the headlight leveling warning light. OK Condition Specified Condition The headlight leveling ECU assembly has been replaced with a new one. Headlight leveling warning light continuously blinks 6 times at 2 Hz. Replacement of the rear height control sensor sub-assembly, removal and reinstallation of the rear height control sensor sub-assembly, replacement of the suspension, etc. have been performed. Headlight leveling warning light comes on for approximately 3 seconds, and then goes off (bulb check function). HINT: If the headlight leveling warning light does not come on when turning the engine switch on (IG), perform troubleshooting according to Problem Symptoms Table. Refer to «PROBLEM SYMPTOMS TABLE [04/2013 - ]»(ref-665568-S33653217242014102400000) Initialization (When using the Techstream) Turn the engine switch off. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Enter the following menus: Body Electrical / HL AutoLeveling / Utility / Height Sensor Initialization. Body Electrical > HL AutoLeveling > Utility Tester Display Height Sensor Initialization Check what is displayed on the screen of the Techstream and press "Next". Check the proper "Position ID" by the fuel level according to the table below. *a Fuel Receiver Gauge (for Sport Package) HINT: The "Position ID" is determined by the present fuel level as shown below. Fuel Level Position ID Number of Times Headlight Leveling Warning Light Blinks Fuel level is within A range. EMPTY 1 Fuel level is within B range. 1/4 to over EMPTY 2 Fuel level is within C range. 1/2 to over 1/4 3 Fuel level is within D range. 3/4 to over 1/2 4 Fuel level is within E range. FULL to over 3/4 5 *a Fuel Receiver Gauge (for Standard) Check what is displayed on the Techstream, select the proper "Position ID" and press "Next". Press "Exit". Check the warning light. Standard Condition Specified Condition The headlight leveling ECU assembly has been replaced with a new one. Blinks 6 times at 2 Hz --> Continuously blinks N*1 times at 2 Hz. Replacement of the rear height control sensor sub-assembly, removal and reinstallation of the rear height control sensor sub-assembly, replacement of the suspension, etc. have been performed. Off --> Continuously blinks N*1 times at 2 Hz. HINT: *1: The number of times that the warning light blinks is determined by the "Position ID" selected. If initialization does not finish normally, restart initialization from procedure (a). Check that initialization finishes normally and turn the engine switch off. Initialization (When not using the Techstream) Turn the engine switch on (IG). Check the specified number of times to turn the low beam headlights on and off. *a Fuel Receiver Gauge (for Sport Package) HINT: The number of times the low beam headlights need to be turned on and off is determined by the present fuel level as shown below. Fuel Level Number of Times to Turn Low Beam Headlights On and Off Fuel level is within A range. 1 Fuel level is within B range. 2 Fuel level is within C range. 3 Fuel level is within D range. 4 Fuel level is within E range. 5 *a Fuel Receiver Gauge (for Standard) Turn the engine switch off. Turn the engine switch on (IG) with the light control switch off. Turn and hold the dimmer switch in the FLASH position, and turn the taillights on and off using the light control switch 3 times. NOTE: Turn the taillights on and off within 5 seconds. HINT: When the switch operation is normal, the headlight leveling warning light blinks at 1 Hz. Turn the low beam headlights on and off according to the specified number of times using the light control switch within 20 seconds. HINT: Turn the low beam headlights on and off at less than 3-second intervals. Check the warning light. Standard Condition Specified Condition The headlight leveling ECU assembly has been replaced with a new one. Blinks 6 times at 2 Hz --> Continuously blinks N*1 times at 2 Hz. Replacement of the rear height control sensor sub-assembly, removal and reinstallation of the rear height control sensor sub-assembly, replacement of the suspension, etc. have been performed. Off --> Continuously blinks N*1 times at 2 Hz. HINT: *1: The number of times that the warning light blinks is determined by the number of times the low beam headlights are turned on and off. If initialization does not finish normally, disconnect SST from the DLC3 and turn the engine switch off. Then, restart initialization from procedure (a). Check that initialization finishes normally and turn the engine switch off.

FREEZE FRAME DATA [04/2013 - ]

1. FREEZE FRAME DATA Whenever a DTC is detected, the headlight leveling ECU assembly stores the current vehicle (sensor) state as freeze frame data.
2. CHECK FREEZE FRAME DATA Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / HL AutoLeveling / Trouble Codes. According to the display on the Techstream, select the trouble code data display with freeze frame data. Body Electrical > HL AutoLeveling Tester Display Measurement Item Range Normal Condition Diagnostic Note +B IG power supply voltage value 0.00 to 19.75 V 11.00 to 14.00 V - Height Sens Pw Supply Val Height control sensor power supply value 0.00 to 5.00 V 4.61 to 5.00 V - Rr Height Sens Signal Val Rear height control sensor signal value 0.00 to 5.00 V 0.50 to 4.50 V Value changes according to vehicle height Headlight Low Beam State Low beam headlight state ON or OFF ON: Low beam headlights on OFF: Low beam headlights off - Headlight High Beam State High beam headlight state ON or OFF ON: High beam headlights on OFF: High beam headlights off - Front Right Wheel Speed Value Front right wheel speed 0.00 to 327.67 km/h (203.61 mph) Condition can be displayed - Front Left Wheel Speed Value Front left wheel speed 0.00 to 327.67 km/h (203.61 mph) Condition can be displayed - Vehicle Acceleration Vehicle acceleration -455.64 to 445.60 m/s 2 Condition can be displayed - Number Of Trouble Codes Number of trouble codes 0 to 255 Condition can be displayed
3. CLEAR FREEZE FRAME DATA NOTE: Clearing the DTCs will also clear the freeze frame data. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Clear the DTCs and freeze frame data. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665568-S31318337792014102400000) Body Electrical > HL AutoLeveling > Clear DTCs

FAIL-SAFE TABLE [04/2013 - ]

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 (ECM) ECM 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 engine switch off to on (IG).