Automatic Headlight Beam Level Control System (Diagnostics - Introduction): Diagnosis Lexus ES XV60

HOW TO PROCEED WITH TROUBLESHOOTING [06/2012 - ]

HINT

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

1. VEHICLE BROUGHT TO WORKSHOP NEXT: Go to next step
2. CUSTOMER PROBLEM ANALYSIS AND SYMPTOM CHECK NEXT: Go to next step
3. INSPECT BATTERY VOLTAGE Measure the battery voltage with the engine switch off. Standard Voltage 11 to 14 V If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step. NEXT: Go to next step
4. INSPECT CAN COMMUNICATION SYSTEM* Use the Techstream to check if the CAN communication system is functioning normally. Result Result Proceed to CAN communication system DTCs are not output. A CAN communication system DTCs are output. B B --> GO TO CAN COMMUNICATION SYSTEM A: Go to next step
5. CHECK FOR DTC* Check for DTCs. Refer to «DTC CHECK / CLEAR [06/2012 - ]»(ref-598482-S00205254992014021400000) . Result Result Proceed to DTCs are not output. A DTCs are output. B B --> Go to step 8 A: Go to next step
6. PROBLEM SYMPTOMS TABLE Refer to Problem Symptoms Table. Refer to «PROBLEM SYMPTOMS TABLE [06/2012 - ]»(ref-598482-S06560528582014021400000) . Result Result Proceed to Fault is not listed in Problem Symptoms Table. A Fault is listed in Problem Symptoms Table. B B --> Go to step 8 A: Go to next step
7. OVERALL ANALYSIS AND TROUBLESHOOTING* Data List / Active Test. Refer to «DATA LIST / ACTIVE TEST [06/2012 - ]»(ref-598482-S23880481502014021400000) Terminals of ECU. Refer to «TERMINALS OF ECU [06/2012 - ]»(ref-598482-S34074592122014021400000) NEXT: Go to next step
8. ADJUST, REPAIR OR REPLACE NEXT: Go to next step
9. CONFIRMATION TEST NEXT --> END

PROBLEM SYMPTOMS TABLE [06/2012 - ]

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.

AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL

Note. Initialize 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. When the headlight leveling ECU assembly is replaced, initialization is also necessary.

Scheme 11

Scheme 12

1. CHECK HEADLIGHT LEVELING ECU ASSEMBLY Disconnect the A29 headlight leveling ECU assembly connector. Measure the voltage and resistance according to the value(s) in the table below. STANDARD VOLTAGE Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition A29-1 (IG) - Body ground LG - Body ground IG power supply Engine switch off Below 1 V Engine switch on (IG) 11 to 14 V STANDARD RESISTANCE Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition A29-9 (E1) - Body ground W-B - Body ground Ground Always Below 1 ohms If the result is not as specified, there may be a malfunction on the wire harness side. Reconnect the A29 headlight leveling ECU assembly connector. Measure the resistance and voltage according to the value(s) in the table below. STANDARD RESISTANCE Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition A29-21 (SGR) - Body ground G - Body ground Rear height control sensor ground Always Below 1 ohms A29-23 (RH-) - Body ground G - Body ground Leveling motor RH ground Always Below 1 ohms A29-24 (LH-) - Body ground B - Body ground Leveling motor LH ground Always Below 1 ohms STANDARD VOLTAGE Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition A29-3 (HDLP) - Body ground G - Body ground Low beam headlight signal input Low beam headlights on Below 1.5 V Low beam headlights off 5 V or higher A29-5 (INIT) - Body ground V - Body ground Initialization signal input Terminals LVL and GND of DLC3 connected Below 1 V Terminals LVL and GND of DLC3 not connected 4.5 to 5.5 V A29-6 (WNG) - Body ground SB - Body ground Warning indicator drive output Warning indicator on Below 1 V Warning indicator off 11 to 14 V A29-10 (RH+) - Body ground R - Body ground Leveling motor RH power supply Engine switch off Below 1 V Engine switch on (IG) 11 to 14 V A29-11 (LH+) - Body ground Y - Body ground Leveling motor LH power supply Engine switch off Below 1 V Engine switch on (IG) 11 to 14 V A29-12 (SBR) - Body ground B - Body ground Rear height control sensor power supply Engine switch off Below 1 V Engine switch on (IG) 4.75 to 5.25 V A29-16 (SPDR) - Body ground L - Body ground Vehicle speed signal input Vehicle driven at approx. 20 km/h (12 mph) Pulse generation (See waveform 1) A29-17 (RHT) - Body ground W - Body ground Leveling motor RH operation signal input With low beam headlights on, vehicle height not changed Below 1 V With low beam headlights on, vehicle height changed and maintained for more than 3 seconds 1.0 to 14.4 V A29-18 (LHT) - Body ground LG - Body ground Leveling motor LH operation signal input With low beam headlights on, vehicle height not changed Below 1 V With low beam headlights on, vehicle height changed and maintained for more than 3 seconds 1.0 to 14.4 V A29-19 (SHRL) - Body ground L - Body ground Rear height control sensor signal input Engine switch off Below 1 V Engine switch on (IG) 0.5 to 4.5 V If the result is not as specified, the headlight leveling ECU assembly may be malfunctioning. Waveform 1 Item Content Tool setting 2 V/DIV., 2 ms./DIV. Vehicle condition Wheel being rotated

DIAGNOSIS SYSTEM [06/2012 - ]

1. DESCRIPTION Automatic headlight beam level control system data and Diagnostic Trouble Codes (DTCs) can be read from the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the Techstream to check for malfunctions and to repair it.
2. CHECK DLC3 Check the DLC3. Refer to «GENERAL INFORMATION [06/2012 - ]»(ref-598449-S41583545682014021400000) .
3. INSPECT BATTERY VOLTAGE Measure the battery voltage with the engine switch off. Standard Voltage 11 to 14 V If the voltage is below 11 V, recharge or replace the battery.

DTC CHECK / CLEAR [06/2012 - ]

1. CHECK DTC Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / HL Auto Leveling / Trouble Codes. Check for DTCs.
2. CLEAR DTC Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / HL Auto Leveling / Trouble Codes. Clear the DTCs.

DATA LIST / ACTIVE TEST [06/2012 - ]

1. DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time. NOTE: 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 faulty or not. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / HL Auto Leveling / Data List. Read the Data List according to the display on the Techstream. HL AUTO LEVELING Tester Display Measurement Item/Range Normal Condition Diagnostic Note Headlight Low Beam State Low beam headlight state/ON or OFF ON: Low beam headlights on OFF: Low beam headlights off - +B IG power supply voltage value/0.00 to 19.75 V 11 to 14 V - Height Sens Pw Supply Val Height control sensor power supply value/0.00 to 5.00 V Approximately 5 V - Rr Height Sens Signal Val Rear height control sensor signal value/0.00 to 5.00 V Approximately 2.5 V (When vehicle is level) Value changes according to vehicle height Vehicle Speed Vehicle speed/0.00 to 327.67 km/h (203.61 mph) Condition can be displayed - Rear Height Adjust Valid Flag Rear height adjustment range/VALID or INVALID Condition can be displayed - Init Writing Count Number of times for initialization/0 to 255 Condition can be displayed - Sensor Initialization Hist Sensor Initialization History/not comp, 10%, 25%, 50%, 75%, 100% or complied Condition can be displayed - Number Of Trouble Codes Number of trouble codes/0 to 255 Condition can be displayed
2. ACTIVE TEST HINT: Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / HL Auto Leveling / Active Test. Perform the Active Test according to the display on the Techstream. HL AUTO LEVELING Tester Display Test Part Control Range Diagnostic Note Drive The Leveling Motor UP*1 Leveling motor upward operation ON/OFF ON: Moves up OFF: Stops Drive The Leveling Motor DOWN*1 Leveling motor downward operation ON/OFF ON: Moves down OFF: Stops *1: Perform the active test with the engine running.

DIAGNOSTIC TROUBLE CODE CHART [06/2012 - ]

AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM