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Automatic Headlight Beam Level Control System (Diagnostic Codes & Circuit Tests): Other Lexus ES XV60

Exterior Lights ~2803 words

PROCEDURE

  1. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR [06/2012 - ]»(ref-598482-S00205254992014021400000) . Check for DTCs. Refer to «DTC CHECK / CLEAR [06/2012 - ]»(ref-598482-S00205254992014021400000) . OK DTC B2416 is not output. NG --> See step 2 OK --> See step 7
  2. READ VALUE USING TECHSTREAM 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 display on the Techstream. HL AUTO LEVELING Tester Display Measurement Item/Range Normal Condition Diagnostic Note Height Sens Pw Supply Val Height control sensor power supply value / 0.00 to 5.00 V Approximately 5 V - OK Normal condition listed above is displayed. NG --> See step 3 OK --> See step 5
  3. INSPECT REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY Remove the rear height control sensor sub-assembly. Refer to «REMOVAL [06/2012 - ]»(ref-598610-S02367285222014021400000) . Inspect the rear height control sensor sub-assembly. Refer to «INSPECTION [06/2012 - ]»(ref-598610-S15708882372014021400000) . NG --> See step 6 OK: Go to next step
  4. CHECK HARNESS AND CONNECTOR (HEADLIGHT LEVELING ECU ASSEMBLY - REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY) Disconnect the A29 headlight leveling ECU assembly connector. Disconnect the Q14 rear height control sensor sub-assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A29-12 (SBR) - Q14-3 (SHB) Always Below 1 ohms A29-21 (SGR) - Q14-1 (SHG) Always Below 1 ohms A29-12 (SBR) - Body ground Always 10 kohms or higher A29-21 (SGR) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 5
  5. REPLACE HEADLIGHT LEVELING ECU ASSEMBLY. Refer to «REMOVAL [06/2012 - ]»(ref-598610-S09077854402014021400000)
  6. REPLACE REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY. Refer to «REMOVAL [06/2012 - ]»(ref-598610-S02367285222014021400000)
  7. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [06/2012 - ]»(ref-598449-S34618498472014021400000)
  1. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR [06/2012 - ]»(ref-598482-S00205254992014021400000) . Check for DTCs. Refer to «DTC CHECK / CLEAR [06/2012 - ]»(ref-598482-S00205254992014021400000) . OK DTC B241A is not output. NG --> See step 2 OK --> See step 7
  2. READ VALUE USING TECHSTREAM 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 display on the Techstream. HL AUTO LEVELING Tester Display Measurement Item/Range Normal Condition Diagnostic Note Height Sens Pw Supply Val Rear 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 the vehicle is level) Value changes according to vehicle height OK Normal conditions listed above are displayed. NG --> See step 3 OK --> See step 5
  3. INSPECT REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY Remove the rear height control sensor sub-assembly. Refer to «REMOVAL [06/2012 - ]»(ref-598610-S02367285222014021400000) . Inspect the rear height control sensor sub-assembly. Refer to «INSPECTION [06/2012 - ]»(ref-598610-S15708882372014021400000) . NG --> See step 6 OK: Go to next step
  4. CHECK HARNESS AND CONNECTOR (HEADLIGHT LEVELING ECU ASSEMBLY - REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY) Disconnect the A29 headlight leveling ECU assembly connector. Disconnect the Q14 rear height control sensor sub-assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A29-19 (SHRL) - Q14-2 (SHRR) Always Below 1 ohms A29-19 (SHRL) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 5
  5. REPLACE HEADLIGHT LEVELING ECU ASSEMBLY. Refer to «REMOVAL [06/2012 - ]»(ref-598610-S09077854402014021400000)
  6. REPLACE REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY. Refer to «REMOVAL [06/2012 - ]»(ref-598610-S02367285222014021400000)
  7. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [06/2012 - ]»(ref-598449-S34618498472014021400000)
  1. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR [06/2012 - ]»(ref-598482-S00205254992014021400000) . Check for DTCs. Refer to «DTC CHECK / CLEAR [06/2012 - ]»(ref-598482-S00205254992014021400000) . OK DTC B2420 is not output. NG --> See step 2 OK --> See step 3
  2. REPLACE HEADLIGHT LEVELING ECU ASSEMBLY. Refer to «REMOVAL [06/2012 - ]»(ref-598610-S09077854402014021400000)
  3. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [06/2012 - ]»(ref-598449-S34618498472014021400000)
  1. PERFORM INITIALIZATION Perform initialization of the headlight leveling ECU assembly. Refer to «INITIALIZATION [06/2012 - ]»(ref-598482-S18857956502014021400000) . NEXT: Go to next step
  2. RECHECK FOR DTC Using the Techstream, recheck for DTCs. Refer to «DTC CHECK / CLEAR [06/2012 - ]»(ref-598482-S00205254992014021400000) . OK DTC B2450 is not output. HINT: If the headlight leveling ECU assembly stores DTC B2450 even though the ECU has been initialized, there may be a malfunction in the headlight leveling ECU assembly. NG --> See step 3 OK --> END
  3. REPLACE HEADLIGHT LEVELING ECU ASSEMBLY. Refer to «REMOVAL [06/2012 - ]»(ref-598610-S09077854402014021400000)
  1. REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Replace the headlight leveling ECU assembly. Refer to «REMOVAL [06/2012 - ]»(ref-598610-S09077854402014021400000) . NEXT: Go to next step
  2. PERFORM INITIALIZATION Perform initialization of the headlight leveling ECU assembly. Refer to «INITIALIZATION [06/2012 - ]»(ref-598482-S18857956502014021400000) . NEXT --> END
  1. PERFORM INITIALIZATION Perform initialization of the headlight leveling ECU assembly. Refer to «INITIALIZATION [06/2012 - ]»(ref-598482-S18857956502014021400000) . HINT: Before initializing the headlight leveling ECU assembly, make sure that the vehicle condition is proper for initialization. Be sure to perform initialization as instructed. NEXT: Go to next step
  2. RECHECK FOR DTC Using the Techstream, recheck for DTCs. Refer to «DTC CHECK / CLEAR [06/2012 - ]»(ref-598482-S00205254992014021400000) . OK DTC B2452 is not output. HINT: If the headlight leveling ECU assembly stores DTC B2452 even though the ECU has been initialized as instructed, there may be a malfunction in the headlight leveling ECU assembly. NG --> See step 3 OK --> END
  3. REPLACE HEADLIGHT LEVELING ECU ASSEMBLY. Refer to «REMOVAL [06/2012 - ]»(ref-598610-S09077854402014021400000)
  1. REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Replace the headlight leveling ECU assembly. Refer to «REMOVAL [06/2012 - ]»(ref-598610-S09077854402014021400000) . NEXT: Go to next step
  2. PERFORM INITIALIZATION Perform initialization of the headlight leveling ECU assembly. Refer to «INITIALIZATION [06/2012 - ]»(ref-598482-S18857956502014021400000) . NEXT --> END
  1. READ VALUE USING TECHSTREAM 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 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 - OK Normal conditions listed above are displayed. NG --> See step 2 OK --> See step 4
  2. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - HEADLIGHT LEVELING ECU ASSEMBLY) Disconnect the 3D instrument panel junction block assembly connector. Disconnect the A29 headlight leveling ECU assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 3D-11 - A29-3 (HDLP) Always Below 1 ohms 3D-11 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Remove the instrument panel junction block assembly. Refer to «REMOVAL [06/2012 - ]»(ref-598640-S21213941222014021400000) . Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 3D-11 - 3D-12 Always Below 1 ohms 3D-11 - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *a Component without harness connected (Instrument Panel Junction Block Assembly) NG --> See step 6 OK --> See step 5
  4. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE [06/2012 - ]»(ref-598482-S06560528582014021400000)
  5. REPLACE HEADLIGHT LEVELING ECU ASSEMBLY. Refer to «REMOVAL [06/2012 - ]»(ref-598610-S09077854402014021400000)
  6. REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to «REMOVAL [06/2012 - ]»(ref-598640-S21213941222014021400000)
  1. READ VALUE USING TECHSTREAM 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 display on the Techstream. HL AUTO LEVELING Tester Display Measurement Item/Range Normal Condition Diagnostic Note +B IG power supply voltage value / 0.00 to 19.75 V 11 to 14 V - OK Normal condition listed above is displayed. NG --> See step 2 OK --> See step 5
  2. CHECK HARNESS AND CONNECTOR (BATTERY - HEADLIGHT LEVELING ECU ASSEMBLY) Disconnect the A29 headlight leveling ECU assembly connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition A29-1 (IG) - Body ground Engine switch on (IG) 11 to 14 V A29-1 (IG) - Body ground Engine switch off Below 1 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Headlight Leveling ECU Assembly) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  3. CHECK HARNESS AND CONNECTOR (HEADLIGHT LEVELING ECU ASSEMBLY - BODY GROUND) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A29-9 (E1) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 4
  4. REPLACE HEADLIGHT LEVELING ECU ASSEMBLY. Refer to «REMOVAL [06/2012 - ]»(ref-598610-S09077854402014021400000)
  5. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE [06/2012 - ]»(ref-598482-S06560528582014021400000)
  1. PERFORM ACTIVE TEST USING TECHSTREAM Connect the Techstream to the DLC3. Start the engine. Turn the Techstream on. Enter the following menus: Body Electrical / HL Auto Leveling / Active Test. Check that the leveling motors operate. HL AUTO LEVELING Tester Display Test Part Control Range Diagnostic Note Drive The Leveling Motor UP Leveling motor upward operation ON/OFF ON: Moves up OFF: Stops Drive The Leveling Motor DOWN Leveling motor downward operation ON/OFF ON: Moves down OFF: Stops OK Headlight leveling motors operate normally. NG --> See step 2 OK --> See step 5
  2. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - HEADLIGHT LEVELING ECU ASSEMBLY) Disconnect the A29 headlight leveling ECU assembly connector. Disconnect the A18 headlight assembly LH connector or A51 headlight assembly RH connector. Measure the resistance according to the value(s) in the table below. Standard Resistance FOR LH SIDE: Tester Connection Condition Specified Condition A29-18 (LHT) - A18-2 (LHT) Always Below 1 ohms A29-11 (LH+) - A18-3 (LHIG) Always Below 1 ohms A29-24 (LH-) - A18-6 (LHE) Always Below 1 ohms A29-18 (LHT) - Body ground Always 10 kohms or higher A29-11 (LH+) - Body ground Always 10 kohms or higher A29-24 (LH-) - Body ground Always 10 kohms or higher FOR RH SIDE: Tester Connection Condition Specified Condition A29-17 (RHT) - A51-2 (RHT) Always Below 1 ohms A29-10 (RH+) - A51-3 (RHIG) Always Below 1 ohms A29-23 (RH-) - A51-6 (RHE) Always Below 1 ohms A29-17 (RHT) - Body ground Always 10 kohms or higher A29-10 (RH+) - Body ground Always 10 kohms or higher A29-23 (RH-) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  3. CHECK HEADLIGHT CORD Remove the headlight cord. Refer to «REMOVAL [06/2012 - ]»(ref-598610-S25046837852014021400000) . for LH Side: Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A18-3 (LHIG) - LVL-3 Always Below 1 ohms A18-2 (LHT) - LVL-2 Always Below 1 ohms A18-6 (LHE) - LVL-1 Always Below 1 ohms A18-3 (LHIG) - Body ground Always 10 kohms or higher A18-2 (LHT) - Body ground Always 10 kohms or higher A18-6 (LHE) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *a Component without harness connected (Headlight Cord (for LH Side)) for RH Side: Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A51-3 (RHIG) - LVR-3 Always Below 1 ohms A51-2 (RHT) - LVR-2 Always Below 1 ohms A51-6 (RHE) - LVR-1 Always Below 1 ohms A51-3 (RHIG) - Body ground Always 10 kohms or higher A51-2 (RHT) - Body ground Always 10 kohms or higher A51-6 (RHE) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *a Component without harness connected (Headlight Cord (for RH Side)) NG --> See step 7 OK: Go to next step
  4. CHECK HEADLIGHT LEVELING MOTOR Replace the headlight leveling motor with a new or known good one. Refer to «REMOVAL [06/2012 - ]»(ref-598610-S25046837852014021400000) . Perform the active test of the leveling motors. OK Headlight leveling motors operate normally. NG --> See step 6 OK --> END (HEADLIGHT LEVELING MOTOR WAS DEFECTIVE)
  5. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE [06/2012 - ]»(ref-598482-S06560528582014021400000)
  6. REPLACE HEADLIGHT LEVELING ECU ASSEMBLY. Refer to «REMOVAL [06/2012 - ]»(ref-598610-S09077854402014021400000)
  7. REPLACE HEADLIGHT CORD. Refer to «REMOVAL [06/2012 - ]»(ref-598610-S25046837852014021400000)
  1. CHECK COMBINATION METER SYSTEM The circuits that send vehicle speed signals to this system are inspected in the meter section. Refer to «Speed Signal Circuit»(ref-598609-S29310982022014021400000) . During inspection of the meter system, if there is an instruction that indicates to go back to inspections for the lighting system, proceed to the next step. NEXT: Go to next step
  2. CHECK HARNESS AND CONNECTOR (HEADLIGHT LEVELING ECU ASSEMBLY - COMBINATION METER ASSEMBLY) Disconnect the H14 combination meter assembly connector. Disconnect the A29 headlight leveling ECU assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A29-16 (SPDR) - H14-19 (+S) Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  3. INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM) Check the output waveform. Remove the combination meter assembly with the connector still connected. Connect an oscilloscope to terminal H14-19 (+S) and body ground. Turn the engine switch on (IG). Check the signal waveform according to the condition(s) in the table below. Item Condition Tool setting 5 V/DIV., 20 ms./DIV. Vehicle condition Wheel being rotated OK The waveform is displayed as shown in the illustration. TEXT IN ILLUSTRATION *a Component with harness connected (Combination Meter Assembly) HINT: When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows. NG --> See step 5 OK --> See step 4
  4. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE [06/2012 - ]»(ref-598482-S06560528582014021400000)
  5. REPLACE COMBINATION METER ASSEMBLY. Refer to «REMOVAL [06/2012 - ]»(ref-598615-S36710752442014021400000)
  1. CHECK HEADLIGHT LEVELING ECU ASSEMBLY (INPUT SIGNAL) Disconnect the A29 headlight leveling ECU assembly connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition A29-6 (WNG) - Body ground Engine switch on (IG) 11 to 14 V Engine switch off Below 1 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Headlight Leveling ECU Assembly) NG --> See step 2 OK --> See step 3
  2. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - HEADLIGHT LEVELING ECU ASSEMBLY) Disconnect the H14 combination meter assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A29-6 (WNG) - H14-3 (LVWG) Always Below 1 ohms A29-6 (WNG) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 4
  3. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE [06/2012 - ]»(ref-598482-S06560528582014021400000)
  4. GO TO METER / GAUGE SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [06/2012 - ]»(ref-598461-S36100139172014021400000)
  1. CHECK HARNESS AND CONNECTOR (DLC3 - HEADLIGHT LEVELING ECU ASSEMBLY) Disconnect the A29 headlight leveling ECU assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A29-5 (INIT) - H29-8 (LVL) Always Below 1 ohms A29-5 (INIT) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  2. CHECK HARNESS AND CONNECTOR (DLC3 - BODY GROUND) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition H29-4 (CG) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 3
  3. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE [06/2012 - ]»(ref-598482-S06560528582014021400000)
  1. CHECK HARNESS AND CONNECTOR (DLC3 - HEADLIGHT LEVELING ECU ASSEMBLY) Disconnect the A29 headlight leveling ECU assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A29-15 (PRST) - H29-7 (SIL) Always Below 1 ohms A29-15 (PRST) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 2
  2. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE [06/2012 - ]»(ref-598482-S06560528582014021400000)

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