DESCRIPTION — Part 1 Lexus GS III рестайлинг

DESCRIPTION

This DTC is output when a failure of the automatic light control sensor circuit is detected.

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1. CHECK OPERATION (AUTOMATIC LIGHT CONTROL SENSOR) Connect the Techstream to the DLC3. Turn the power switch ON (IG) and Techstream ON. Check that the value of the illumination rate changes in the following range when light contacts the light sensor or when the light sensor is covered. OK 0.008 to 0.022 seconds HINT: This is the time taken for the light sensor to generate one cycle of frequency according to the brightness. OK --> REPAIR MAIN BODY ECU RH NG: Go to next step
2. CHECK WIRE HARNESS (ECU - SENSOR) Disconnect the K67 ECU connector. Disconnect the L1 sensor connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition K67-6 (CLTB) - L1-6 (CLTB) Below 1 ohms K67-4 (CLTE) - L1-3 (CLTE) Below 1 ohms K67-5 (CLTS) - L1-5 (CLTS) Below 1 ohms K67-6 (CLTB) - Body ground 10 kohms or higher K67-4 (CLTE) - Body ground 10 kohms or higher K67-5 (CLTS) - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK AUTOMATIC LIGHT CONTROL SENSOR Disconnect the L1 sensor connector. Connect the voltmeter's positive (+) lead to terminal 6 (CLTB) and the negative (-) lead to terminal 3 (CLTE). Measure the voltage of the connector. Standard voltage Tester Connection Specified Condition L1-3 (CLTE) - L1-6 (CLTB) 10 to 14 V Measure the resistance of the connector. Standard resistance Tester Connection Specified Condition L1-3 (CLTE) - Body ground Below 1 ohms Connect the L1 sensor connector. Check the waveform of the connector. Standard voltage Tester Connection Condition Specified Condition Tester Range L1-3 (CLTE) - L1-5 (CLTS) Power switch ON (IG), headlight dimmer switch in AUTO Correct waveform is as shown 5 V / Division, 5 msec / Division If the ambient light becomes brighter, width A becomes narrower. If the result is not as specified, replace the automatic light control sensor. NG --> REPLACE AUTOMATIC LIGHT CONTROL SENSOR OK --> REPLACE MAIN BODY ECU RH

The electric current flowing in the transistor inside the junction block is examined by the rear multiplex network ECU.

When excessive current is detected, DTC B2402 is output.

When overheating occurs prior to an excessive current, the ECU cuts off the current in the transistor to prevent it from being damaged and outputs DTC B2403.

Normally, turning off the power switch clears DTC. However, if an excessive current is detected frequently (9 times or more), DTC may not be cleared.

When this happens, disconnect the cable from the negative (-) battery terminal to clear DTC.

The swivel actuator receives the signal from the AFS ECU to operate and sends the signal regarding the direction of the headlight and condition of the headlight swivel motor to the AFS ECU.

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1. PERFORM ACTIVE TEST USING TECHSTREAM (SWIVEL MOTOR) Connect the Techstream to the DLC3. Turn the power switch ON (IG) and turn the Techstream on. Select the item below in the ACTIVE TEST and then check that the motor operates. AFS (AFS ECU) Item Test Details Diagnostic Note Drive Swivel Motor RH Drive the swivel motor RIGHT / OFF - Drive Swivel Motor LH Drive the swivel motor LEFT / OFF - OK Swivel actuator operates. RESULT Result Proceed to NG A OK (When checking from DIAGNOSTIC TROUBLE CODE CHART) B OK (When checking from PROBLEM SYMPTOMS TABLE) C C --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE B --> REPLACE AFS ECU A: Go to next step
2. INSPECT HEADLIGHT ASSEMBLY Disconnect the B11 and B2 headlight connectors. Measure the resistance of the connector. Standard resistance FOR LH (B2412) Tester Connection Specified Condition B11-23 (BL1-) - B11-24 (BL1+) 6 to 8 ohms B11-21 (BL2-) - B11-22 (BL2+) 6 to 8 ohms FOR RH (B2413) Tester Connection Specified Condition B2-23 (BR1-) - B2-24 (BR1+) 6 to 8 ohms B2-22 (BR2+) - B2-21 (BR2-) 6 to 8 ohms HINT: Measure the resistance after the headlight has cooled. NG --> REPLACE HEADLIGHT ASSEMBLY OK: Go to next step
3. CHECK WIRE HARNESS (HEADLIGHT - ECU) Disconnect the A28 ECU connector. Disconnect the B11 and B2 headlight connectors. Measure the resistance of the wire harness side connectors. Standard resistance FOR LH (B2412) Tester Connection Specified Condition A28-25 (BL1+) - B11-24 (BL1+) Below 1 ohms A28-26 (BL1-) - B11-23 (BL1-) Below 1 ohms A28-27 (BL2+) - B11-22 (BL2+) Below 1 ohms A28-28 (BL2-) - B11-21 (BL2-) Below 1 ohms A28-19 (SMGL) - B11-19 (SMGL) Below 1 ohms A28-24 (SML) - B11-18 (SML) Below 1 ohms A28-22 (SMBL) - B11-20 (SMBL) Below 1 ohms A28-25 (BL1+) - Body ground 10 kohms or higher A28-26 (BL1-) - Body ground 10 kohms or higher A28-27 (BL2+)- Body ground 10 kohms or higher A28-28 (BL2-) - Body ground 10 kohms or higher A28-19 (SMGL) - Body ground 10 kohms or higher A28-24 (SML) - Body ground 10 kohms or higher A28-22 (SMBL) - Body ground 10 kohms or higher FOR RH (B2413) Tester Connection Specified Condition A28-9 (BR1+) - B2-24 (BR1+) Below 1 ohms A28-10 (BR1-) - B2-23 (BR1-) Below 1 ohms A28-11 (BR2+) - B2-22 (BR2+) Below 1 ohms A28-12 (BR2-) - B2-21 (BR2-) Below 1 ohms A28-18 (SMGR) - B2-19 (SMGR) Below 1 ohms A28-23 (SMR) - B2-18 (SMR) Below 1 ohms A28-21 (SMBR) - B2-20 (SMBR) Below 1 ohms A28-9 (BR1+)- Body ground 10 kohms or higher A28-10 (BR1-) - Body ground 10 kohms or higher A28-11 (BR2+) - Body ground 10 kohms or higher A28-12 (BR2-) - Body ground 10 kohms or higher A28-18 (SMGR) - Body ground 10 kohms or higher A28-23 (SMR) - Body ground 10 kohms or higher A28-21 (SMBR) - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK AFS ECU Disconnect the B11 and B2 headlight connectors. Measure the voltage of the wire harness side connector. Standard voltage FOR LH (B2412) Tester Connection Condition Specified Condition B11-20 (SMBL) - B11-19 (SMGL) Power switch OFF Below 1 V B11-20 (SMBL) - B11-19 (SMGL) Power switch ON (IG) 4.5 to 5.5 V FOR RH (B2413) Tester Connection Condition Specified Condition B2-20 (SMBR) - B2-19 (SMGR) Power switch OFF Below 1 V B2-20 (SMBR) - B2-19 (SMGR) Power switch ON (IG) 4.5 to 5.5 V RESULT Result Proceed to OK A NG (When checking from the PROBLEM SYMPTOMS TABLE) B NG (When checking from the DIAGNOSTIC TROUBLE CODE CHART) C C --> REPLACE AFS ECU B --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE A: Go to next step
5. REPLACE HEADLIGHT ASSEMBLY Temporarily replace the headlight with a new or normally functioning one. Check that the headlight operates. OK Headlight operates normally. NG --> REPLACE AFS ECU OK --> END

The AFS ECU receives signals regarding the swerve-angle from the steering sensor in the steering wheel.

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1. READ VALUE USING TECHSTREAM (STEERING SENSOR) Connect the Techstream to the DLC3. Turn the power switch ON (IG) and turn the Techstream on. Select the items below in the DATA LIST, and read the displays on the Techstream. AFS (AFS ECU) Item Measurement Item / Display (Range) Normal Condition Diagnostic Note Steering Sens Signal Steering sensor signal value / -384° to -382.5° Approx. 0° (When steering wheel is straight) - OK Condition value will be displayed. RESULT Result Proceed to NG A OK (When checking from DIAGNOSTIC TROUBLE CODE CHART) B OK (When checking from PROBLEM SYMPTOMS TABLE) C C --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE B --> REPLACE AFS ECU A: Go to next step
2. CHECK DTC (VEHICLE STABILITY CONTROL SYSTEM) Check the DTC of the vehicle stability control system. OK DTC is not output. NG --> GO TO VEHICLE STABILITY CONTROL SYSTEM OK: Go to next step
3. CHECK WIRE HARNESS (STEERING CONTROL ECU - AFS ECU) Disconnect the A40 and A29 ECU connectors. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition A40-5 (AFS-) - A29-8 (SS-) Below 1 ohms A40-2 (AFS+) - A29-7 (SS+) Below 1 ohms A29-8 (SS-) - Body ground 10 kohms or higher A29-7 (SS+) - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK AFS ECU Reconnect the A29 ECU connector. Measure the voltage of the connector. Standard voltage Tester Connection Condition Specified Condition A29-7 (SS+) - A29-8 (SS-) Power switch ON (IG) 0 to 5 V (Pulse generation) RESULT Result Proceed to OK (When checking from DIAGNOSTIC TROUBLE CODE CHART) A OK (When checking from PROBLEM SYMPTOMS TABLE) B NG C C --> REPLACE STEERING CONTROL ECU B --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE A --> REPLACE AFS ECU

The AFS ECU receives signals regarding the front wheel speed from the skid control ECU.

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1. CHECK DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM) Check the electronically controlled brake system. OK DTC is not output. NG --> GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM OK: Go to next step
2. CHECK WIRE HARNESS (SKID CONTROL ECU - AFS ECU) Disconnect the A13, A15 and A28 ECU connectors. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition A13-10 (FRO) - A28-7 (SPDR) Below 1 ohms A15-10 (FLO) - A28-6 (SPDL) Below 1 ohms A28-7 (SPDR) - Body ground 10 kohms or higher A28-6 (SPDL) - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK AFS ECU Measure the voltage of the connector. Standard voltage Tester Connection Condition Specified Condition A28-6 (SPDL) - Body ground Vehicle is driving at approx. 30 km/h (19 mph) 0 to 5 V Pulse generation (see waveform 1) A28-7 (SPDR) - Body ground Vehicle is driving at approx. 30 km/h (19 mph) 0 to 5 V Pulse generation (see waveform 1) Using an oscilloscope, check waveform 1. WAVEFORM 1 Item Contents Tester Connection A28-6 (SPDL) - Body ground A28-7 (SPDR) - Body ground Tool setting 2 V / DIV., 2 msec. / DIV. Vehicle condition Vehicle is driving at approximately 30 km/h (19 mph) OK Waveform is output as shown in the illustration. RESULT Result Proceed to OK (When checking from DIAGNOSTIC TROUBLE CODE CHART) A OK (When checking from PROBLEM SYMPTOMS TABLE) B NG C C --> REPLACE SKID CONTROL ECU B --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE A --> REPLACE AFS ECU

The AFS ECU receives signals regarding the height of the front/rear of the vehicle from the height control sensor.

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1. READ VALUE USING TECHSTREAM (HEIGHT CONTROL SENSOR) Connect the Techstream to the DLC3. Turn the power switch ON (IG) and turn the Techstream on. Select the items below in the DATA LIST, and read the displays on the Techstream. AFS (AFS ECU) Item Measurement Item / Display (Range) Normal Condition Diagnostic Note Fr Height Sens Signal Val Front height sensor signal value / 0 to 5 V Approx. 2.5 V - Rr Height Sens Signal Val Rear height sensor signal value / 0 to 5 V Approx. 2.5 V - OK Condition value will be displayed. RESULT Result Proceed to NG A OK (When checking from DIAGNOSTIC TROUBLE CODE CHART) B OK (When checking from PROBLEM SYMPTOMS TABLE) C C --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE B --> REPLACE AFS ECU A: Go to next step
2. CHECK FRONT HEIGHT CONTROL SENSOR LH Disconnect the A20 sensor connector. Measure the voltage of the wire harness side connector. Standard voltage Tester Connection Condition Specified Condition A20-1 (SHG) - A20-3 (SHB) Power switch ON (IG) 4.5 to 5.5 V NG --> See step 8 OK: Go to next step
3. CHECK REAR HEIGHT CONTROL SENSOR LH Disconnect the o2 sensor connector. Measure the voltage of the wire harness side connector. Standard voltage Tester Connection Condition Specified Condition o2-1 (SHG) - o2-3 (SHB) Power switch ON (IG) 4.5 to 5.5 V NG --> See step 9 OK: Go to next step
4. CHECK WIRE HARNESS (ECU - FRONT HEIGHT CONTROL SENSOR) Disconnect the A20 sensor connector. Disconnect the A28 ECU connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition A28-2 (SHFL) - A20-2 (SHFL) Below 1 ohms A28-2 (SHFL) - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. CHECK WIRE HARNESS (AFS ECU - REAR HEIGHT CONTROL SENSOR) Disconnect the A29 AFS ECU connector. Disconnect the o2 sensor connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition A29-9 (SHRL) - o2-2 (SHRL) Below 1 ohms A29-9 (SHRL) - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
6. INSPECT FRONT HEIGHT CONTROL SENSOR LH Connect the 3 dry cell batteries (1.5 V) in series. Remove the height control sensor assembly front. Connect the positive (+) lead from the battery to terminal 3 and the negative (-) lead from the battery to terminal 1. Measure the voltage between terminals 2 and 1 while slowly moving the link up and down. Standard voltage Tester Connection Condition Specified Condition A20-2 (SHFL) - A20-1 (SHG) +45° Approx. 4.5 V A20-2 (SHFL) - A20-1 (SHG) 0° (Normal) Approx. 2.5 V A20-2 (SHFL) - A20-1 (SHG) -45° (Low) Approx. 0.5 V NG --> REPLACE FRONT HEIGHT CONTROL SENSOR LH OK: Go to next step
7. INSPECT REAR HEIGHT CONTROL SENSOR LH Connect the 3 dry cell batteries (1.5 V) in series. Remove the height control sensor assembly rear. Connect the positive (+) lead from the battery to terminal 3 and the negative (-) lead from the battery to terminal 1. Measure the voltage between terminals 2 and 1 while slowly moving the link up and down. Standard voltage Tester Connection Condition Specified Condition o2-2 (SHRL) - o2-1 (SHG) +45° Approx. 4.5 V o2-2 (SHRL) - o2-1 (SHG) 0° (Normal) Approx. 2.5 V o2-2 (SHRL) - o2-1 (SHG) -45° (Low) Approx. 0.5 V RESULT Result Proceed to OK (When checking from DIAGNOSTIC TROUBLE CODE CHART) A OK (When checking from PROBLEM SYMPTOMS TABLE) B NG C C --> REPLACE REAR HEIGHT CONTROL SENSOR LH B --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE A --> REPLACE AFS ECU
8. CHECK AFS ECU Measure the voltage of the connector. Standard voltage Tester Connection Condition Specified Condition A28-1 (SBF) - A28-17 (SGF) Power switch ON (IG) 4.5 to 5.5 V RESULT Result Proceed to OK A NG (When checking from DIAGNOSTIC TROUBLE CODE CHART) B NG (When checking from PROBLEM SYMPTOMS TABLE) C C --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE B --> REPLACE AFS ECU A --> REPAIR OR REPLACE HARNESS OR CONNECTOR
9. CHECK AFS ECU Measure the voltage of the connector. Standard voltage Tester Connection Condition Specified Condition A29-10 (SBR) - A29-20 (SGR) Power switch ON (IG) 4.5 to 5.5 V RESULT Result Proceed to OK A NG (When checking from the DIAGNOSTICS TROUBLE CODE CHART) B NG (When checking from the PROBLEM SYMPTOMS TABLE) C C --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE B --> REPLACE AFS ECU A --> REPAIR OR REPLACE HARNESS OR CONNECTOR

The leveling actuator receives the signal from the AFS ECU to operate. The AFS ECU receives signals regarding the operating conditions of the leveling actuator.

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1. PERFORM ACTIVE TEST USING TECHSTREAM (HEADLIGHT BEAM LEVEL CONTROL MOTOR) Connect the Techstream to the DLC3. Turn the power switch ON (IG) and turn the Techstream on. Select the item below in the ACTIVE TEST and then check the motor operation. AFS (AFS ECU) Item Test Details Diagnostic Note Drive The Leveling Motor Drive the leveling motor UP / OFF (OFF) - Drive The Leveling Motor Drive the leveling motor DOWN / OFF (OFF) - OK Headlight beam leveling control motor is operated. RESULT Result Proceed to NG A OK (When checking from DIAGNOSTIC TROUBLE CODE CHART) B OK (When checking from PROBLEM SYMPTOMS TABLE) C C --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE B --> REPLACE AFS ECU A: Go to next step
2. CHECK WIRE HARNESS (MOTOR - ECU AND BODY GROUND) Disconnect the B11 and B2 motor connectors. Disconnect the A28 AFS ECU connector. Measure the resistance of the wire harness side connectors. Standard resistance FOR LH (B2417) Tester Connection Specified Condition A28-29 (LL1+) - B11-15 (LL1+) Below 1 ohms A28-30 (LL1-) - B11-14 (LL1-) Below 1 ohms A28-31 (LL2+) - B11-13 (LL2+) Below 1 ohms A28-32 (LL2-) - B11-12 (LL2-) Below 1 ohms A28-29 (LL1+) - Body ground 10 kohms or higher A28-30 (LL1-) - Body ground 10 kohms or higher A28-31 (LL2+) - Body ground 10 kohms or higher A28-32 (LL2-) - Body ground 10 kohms or higher for RH (B2418) Tester Connection Specified Condition A28-13 (LR1+) - B2-15 (LR1+) Below 1 ohms A28-14 (LR1-) - B2-14 (LR1-) Below 1 ohms A28-15 (LR2+) - B2-13 (LR2+) Below 1 ohms A28-16 (LR2-) - B2-12 (LR2-) Below 1 ohms A28-13 (LR1+) - Body ground 10 kohms or higher A28-14 (LR1-) - Body ground 10 kohms or higher A28-15 (LR2+) - Body ground 10 kohms or higher A28-16 (LR2-) - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. INSPECT HEADLIGHT LEVELING MOTOR Measure the resistance of the connector. Standard resistance Tester Connection Specified Condition 1 - 2 5.8 to 12.5 ohms 3 - 4 5.8 to 12.5 ohms RESULT Result Proceed to OK (When checking from DIAGNOSTIC TROUBLE CODE CHART) A OK (When checking from PROBLEM SYMPTOMS TABLE) B NG C C --> REPLACE HEADLIGHT ASSEMBLY B --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE A --> REPLACE AFS ECU

The AFS ECU receives signals regarding the lighting condition of the headlight, shift position of the transmission, engine condition from the generator and vehicle speed from the combination meter using multiplex communication system.

When the DTC B2419 is output, the other DTCs are output at the same time.

When the AFS ECU detects a malfunction in itself, a DTC is output.

The headlight relay is turned ON by operating the headlight switch.

When the theft deterrent system is activated, it causes the main body ECU RH to turn the headlight relay on and off repeatedly at approximately 0.25 second intervals to flash the headlights.

In this condition, if any of the following operations is performed, the ECU to turns the headlight relay off to stop the headlight from flashing

1. Unlock the driver door with a key.
2. Turn the power switch ON (ACC) or ON (IG).
3. Unlock the doors with the wireless door lock control system.

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1. PERFORM ACTIVE TEST USING TECHSTREAM (HEADLIGHT) Select the ACTIVE TEST, use the Techstream to generate a control command, and then check that the headlight (low) illuminates. BODY (MAIN BODY ECU RH) Item Test Details Diagnostic Note Headlight Relay Headlight relay ON / OFF - OK Headlight (low) illuminates. OK --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE NG: Go to next step
2. INSPECT FUSE (H-LP L LWR, H-LP R LWR) Remove the H-LP L LWR and H-LPR LWR fuses from the engine room No. 1 relay block. Measure the resistance of the fuses. Standard resistance Below 1 ohms NG --> REPLACE FUSE OK: Go to next step
3. INSPECT HEADLIGHT RELAY (Marking: HEAD LP) Remove the headlight relay from the engine room No. 1 relay block. Measure the resistance of the headlight relay. Standard resistance Tester Connection Specified Condition 3 - 5 10 kohms or higher 3 - 5 Below 1 ohms (when battery voltage is applied to terminals 1 and 2) NG --> REPLACE HEADLIGHT RELAY OK: Go to next step
4. CHECK WIRE HARNESS (ECU - BATTERY) Disconnect the DL ECU connector. Measure the voltage of the wire harness side connector. Standard voltage Tester Connection Specified Condition DL-7 (HRLY) - Body ground 10 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. CHECK WIRE HARNESS (HEADLIGHT - BATTERY AND BODY GROUND) Check the wire harness between the headlight (Low LH) and battery, and the headlight (Low LH) and body ground. Disconnect the B11 light connector. Turn the light control switch to the ON (HEAD) position. Measure the voltage of the wire harness side connector. Standard voltage Tester Connection Specified Condition B11-17 (LO) - Body ground 10 to 14 V Measure the resistance of the wire harness side connector. Standard resistance Tester Connection Specified Condition B11-16 (E) - Body ground Below 1 ohms Check the wire harness between the headlight (Low RH) and battery, and the headlight (Low RH) and body ground. Disconnect the B2 light connector. Turn the light control switch to the ON (HEAD) position. Measure the voltage of the wire harness side connector. Standard voltage Tester Connection Condition Specified Condition B2-17 (LO) - Body ground Power switch ON (IG) 10 to 14 V Measure the resistance of the wire harness side connector. Standard resistance Tester Connection Specified Condition B2-16 (E) - Body ground Below 1 ohms OK --> REPLACE HEADLIGHT ASSEMBLY NG --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

The front light ECU receives headlight HI switch information from the combination switch, and turns on the headlights.

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1. PERFORM ACTIVE TEST USING TECHSTREAM (HEADLIGHT) Select the ACTIVE TEST, use the Techstream to generate a control command, and then check that the headlight assembly illuminates. BODY NO. 5 (FRONT LIGHT ECU) Item Test Details Diagnostic Note Light Head (High) Headlight (High) ON / OFF - OK Headlight illuminates. OK --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE NG: Go to next step
2. INSPECT FUSE (H-LP UPR, FR CTRL-B) Remove the FR CTRL-B and FR CTRL-B fuses from the engine room No. 1 relay block. Measure the resistance of the fuses. Standard resistance Below 1 ohms NG --> REPLACE FUSE OK: Go to next step
3. REPLACE HEADLIGHT NO. 1 BULB (RH OR LH) Temporarily replace the headlight No. 1 bulb with a new or normally functioning one. Check that the bulb illuminates. OK Headlight No. 1 bulb illuminates. OK --> END NG: Go to next step
4. CHECK WIRE HARNESS (ECU - BATTERY) Disconnect the 1Y ECU connector. Measure the voltage of the wire harness side connector. Standard voltage Tester Connection Specified Condition 1Y-2 - Body ground 10 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. CHECK WIRE HARNESS (ECU - HEADLIGHT AND BODY GROUND) Check the wire harness between the headlight (LH) and front light ECU, and headlight (LH) and body ground. Disconnect the 1Z ECU connector. Disconnect the B11 headlight connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition 1Z-13 - B11-2 (HI) Below 1 ohms B11-1 (E) - Body ground Below 1 ohms 1Z-13 or B11-2 (HI) - Body ground 10 kohms or higher Check the wire harness between the headlight (RH) and front light ECU, and headlight (RH) and body ground. Disconnect the 1Z ECU connector. Disconnect the B2 headlight connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition 1Z-12 - B2-2 (HI) Below 1 ohms B2-1 (E) - Body ground Below 1 ohms 1Z-12 or B2-2 (HI) - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

The front light ECU receives fog light switch information from the combination switch, and turns on the fog light.

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1. PERFORM ACTIVE TEST USING TECHSTREAM (FRONT FOG LIGHT RELAY) Select the item below in the ACTIVE TEST, use the Techstream to generate a control command, and then check that the fog light illuminates. BODY NO. 5 (FRONT LIGHT ECU) Item Test Details Diagnostic Note Front Fog Light Relay Front fog light relay ON / OFF - OK Front fog light illuminates. OK --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE NG: Go to next step
2. INSPECT FUSE (FR FOG, FR CTRL-AM) Remove the FR CTRL-AM and FR FOG fuses from the engine room No. 1 relay block. Measure the resistance of the fuses. Standard resistance Below 1 ohms NG --> REPLACE FUSE OK: Go to next step
3. REPLACE FRONT FOG LIGHT BULB Temporarily replace the fog light bulb with a new or normally functioning one. Check that the bulb illuminates. OK Fog light bulb illuminates. OK --> END NG: Go to next step
4. CHECK WIRE HARNESS (ECU - BATTERY) Disconnect the 1Y ECU connector. Measure the resistance of the wire harness side connector. Standard voltage Tester Connection Specified Condition 1Y-1 - Body ground 10 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. CHECK WIRE HARNESS (ECU - LIGHT AND BODY GROUND) Check the wire harness between the front fog light LH and front light ECU, and the front fog light LH and body ground. Disconnect the 1Z ECU connector. Disconnect the B12 light connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition 1Z-7 - B12-2 Below 1 ohms B12-1 - Body ground Below 1 ohms 1Z-7 or B12-2 - Body ground 10 kohms or higher Check the wire harness between the front fog light RH and front control ECU, and the front fog light RH and body ground. Disconnect the 1Z ECU connector. Disconnect the B1 light connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition 1Z-6 - B1-2 Below 1 ohms B1-1 - Body ground Below 1 ohms 1Z-6 or B1-2 - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

Receiving the signal of the turn signal switch from the cowl side junction block ECU LH, the cowl side junction block ECU LH makes the turn signal light come on.

The cowl side junction block ECU LH activates the flasher relay while the theft deterrent system gives the warning and turns on the turn signal light and the hazard warning light.

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1. CHECK OPERATION (TURN SIGNAL LIGHT) When the turn signal light switch is operated, check that the appropriate turn signal light flashes. Result Result Proceed to All lights do not flash A Headlight assembly (turn LH or turn RH) does not flash B Side turn signal light assembly (LH or RH) does not flash C Rear combination light (turn LH or turn RH) does not flash D D --> See step 11 C --> See step 9 B --> See step 7 A: Go to next step
2. PERFORM ACTIVE TEST USING TECHSTREAM Select the Active Test, use the Techstream to generate a control command, and then check that the turn signal light flashes. Cowl side junction block ECU LH Item Test Details Diagnostic Note Turn Light RH Turn signal light operation ON / OFF - Turn Light LH Turn signal light operation ON / OFF - OK Turn signal light flashes. NG --> See step 3 OK --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
3. INSPECT FUSE (TURN-HAZ, LH-IG) Remove the LH-IG fuse from the cowl side junction block LH. Remove the TURN-HAZ fuse from the engine room No. 1 junction block. Measure the resistance of the fuses. Standard resistance Below 1 ohms NG --> REPLACE FUSE OK: Go to next step
4. CHECK WIRE HARNESS (TURN SIGNAL FLASHER - BATTERY AND BODY GROUND) Disconnect the K25 flasher connector. Measure the voltage and resistance of the wire harness side connector. Standard voltage Tester Connection Condition Specified Condition K25-1 (IG) - Body ground Power switch on (IG) 10 to 14 V K25-4 (B) - Body ground Always 10 to 14 V Standard resistance Tester Connection Specified Condition K25-7 (E) - Body ground Below 1 ohms NG --> REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step
5. CHECK WIRE HARNESS (TURN SIGNAL FLASHER - MAIN BODY ECU LH) Disconnect the K25 flasher connector. Disconnect the PA ECU connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition K25-5 (EL) - PA-16 (TL) Below 1 ohms K25-6 (ER) - PA-15 (TR) Below 1 ohms K25-5 (EL) or PA-16 (TL) - Body ground 10 kohms or higher K25-6 (ER) or PA-15 (TR) - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step
6. REPLACE TURN SIGNAL FLASHER Temporarily replace the turn signal flasher with a new or normally functioning one. Check that the turn signal flasher operates. OK Front turn signal light bulb (turn LH) flashes. OK --> END NG --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
7. REPLACE FRONT TURN SIGNAL LIGHT BULB (TURN LH OR TURN RH) Temporarily replace the front turn signal light bulb (turn LH or turn RH) with a new or normally functioning one. Check that the front turn signal light bulb (turn LH or turn RH) flashes. OK Front turn signal light bulb (turn LH or turn RH) flashes. OK --> END NG: Go to next step
8. CHECK WIRE HARNESS (TURN SIGNAL FLASHER - HEADLIGHT ASSEMBLY (TURN LH OR TURN RH) - BODY GROUND) Check the wire harness between the headlight (turn LH) and turn signal flasher, and the headlight (turn LH) and body ground. Disconnect the K25 flasher connector. Disconnect the B11 headlight connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition K25-3 (LL) - B11-9 Below 1 ohms K25-3 (LL) or B11-9 - Body ground 10 kohms or higher B11-8 - Body ground Below 1 ohms Check the wire harness between the headlight (turn RH) and turn signal flasher, and the headlight (turn RH) and body ground. Disconnect the K25 flasher connector. Disconnect the B2 headlight connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition K25-2 (LR) - B2-9 Below 1 ohms K25-2 (LR) or B2-9 - Body ground 10 kohms or higher B2-8 - Body ground Below 1 ohms NG --> REPAIR OR REPLACE HARNESS AND CONNECTOR OK --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
9. REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY (LH OR RH) Temporarily replace the side turn signal light assembly (LH or RH) with a new or normally functioning one. Check that the side turn signal light assembly (LH or RH) flashes. OK Side turn signal light assembly (LH or RH) flashes. OK --> END NG: Go to next step
10. CHECK WIRE HARNESS (TURN SIGNAL FLASHER - SIDE TURN SIGNAL LIGHT ASSEMBLY (LH OR RH) - BODY GROUND) Check the wire harness between the side turn signal light assembly (LH) and turn signal flasher, and the side turn signal light assembly (LH) and body ground. Disconnect the K25 flasher connector. Disconnect the side turn signal light assembly connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition K25-3 (LL) - 2 (Side turn signal light assembly) Below 1 ohms K25-3 (LL) - Body ground 10 kohms or higher 1 (Side turn signal light assembly) - Body ground Below 1 ohms Check the wire harness between the side turn signal light assembly (RH) and turn signal flasher, and the side turn signal light assembly (RH) and body ground. Disconnect the K25 flasher connector. Disconnect the side turn signal light assembly connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition K25-2 (LR) - 2 (Side turn signal light assembly) Below 1 ohms K25-2 (LR) - Body ground 10 kohms or higher 1 (Side turn signal light assembly) - Body ground Below 1 ohms NG --> REPAIR OR REPLACE HARNESS AND CONNECTOR OK --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
11. REPLACE REAR COMBINATION LIGHT BULB (TURN LH OR TURN RH) Temporarily replace the rear combination light bulb (turn LH or turn RH) with a new or normally functioning one. Check that the rear combination light bulb (turn LH or turn RH) flashes. OK Rear combination light bulb (turn LH or turn RH) flashes. OK --> END NG: Go to next step
12. CHECK WIRE HARNESS (TURN SIGNAL FLASHER - REAR COMBINATION LIGHT (TURN LH OR TURN RH) - BODY GROUND) Check the wire harness between the rear combination light (turn LH) and turn signal flasher, and the rear combination light (turn LH) and body ground. Disconnect the K25 flasher connector. Disconnect the X1 combination light connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition K25-3 (LL) - X1-4 (TRN) Below 1 ohms K25-3 (LL) or X1-4 (TRN) - Body ground 10 kohms or higher X1-6 (E) - Body ground Below 1 ohms Check the wire harness between the rear combination light (turn RH) and turn signal flasher, and the rear combination light (turn RH) and body ground. Disconnect the K25 flasher connector. Disconnect the X3 combination light connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition K25-2 (LR) - X3-8 (TRN) Below 1 ohms K25-2 (LR) or X3-8 (TRN) - Body ground 10 kohms or higher X3-6 (E) - Body ground Below 1 ohms NG --> REPAIR OR REPLACE HARNESS AND CONNECTOR OK --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

The hazard warning switch sends a signal to the turn signal flasher.

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1. INSPECT MULTI-DISPLAY (HAZARD WARNING SWITCH) Disconnect the K46 display connector. Measure the resistance of the multi-display connector. Standard resistance Tester Connection Condition Specified Condition K46-8 (HAZ) - K46-10 (GND1) Hazard warning switch OFF 10 kohms or higher K46-8 (HAZ) - K46-10 (GND1) Hazard warning switch ON Below 1 ohms NG --> REPLACE MULTI-DISPLAY OK: Go to next step
2. CHECK WIRE HARNESS (MULTI-DISPLAY - TURN SIGNAL FLASHER AND BODY GROUND) Disconnect the K46 display connectors. Disconnect the K25 flasher connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition K46-8 (HAZ) - K25-8 (HAZ) Below 1 ohms K46-10 (GND1) - Body ground Below 1 ohms K46-8 (HAZ) or K25-8 (HAZ) - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

Front light

The front light ECU receives taillight switch information from the combination switch, and turns on the clearance light.

Rear light

The rear multiplex network ECU receives taillight switch information from the combination switch, and turns on the taillights and license plate light.

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1. CHECK OPERATION OF FRONT LIGHT OR REAR LIGHT When the taillight switch is operated, check that the following lights illuminate. RESULT Result Proceed to Front lights do not illuminate A Rear lights do not illuminate B B --> See step 7 A: Go to next step
2. PERFORM ACTIVE TEST USING TECHSTREAM (CLEARANCE LIGHT) Select the ACTIVE TEST, use the Techstream to generate a control command, and then check that the clearance light illuminates. BODY NO. 5 (FRONT LIGHT ECU) Item Test Details Diagnostic Note Clearance Light Operation Clearance light ON / OFF - OK Light illuminates. OK --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE NG: Go to next step
3. INSPECT FUSE (FR TAIL, FR CTRL-AM) Remove the FR CTRL-AM and FR CTRL-AM fuses from the engine room No. 1 relay block. Measure the resistance of the fuses. Standard resistance Below 1 ohms NG --> REPLACE FUSE OK: Go to next step
4. REPLACE CLEARANCE LIGHT BULB Temporarily replace the clearance light bulb with a new or normally functioning one. Check that the bulb illuminates. OK Clearance light bulb illuminates. OK --> END NG: Go to next step
5. CHECK WIRE HARNESS (ECU - BATTERY) Disconnect the 1Y ECU connector. Measure the voltage of the wire harness side connector. Standard voltage Tester Connection Specified Condition 1Y-1 - Body ground 10 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
6. CHECK WIRE HARNESS (ECU - HEADLIGHT AND BODY GROUND) Check the wire harness between the headlight (clearance LH) and front light ECU, and the headlight (clearance LH) and body ground. Disconnect the 1Z ECU connector. Disconnect the B11 headlight connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition 1Z-9 - B11-7 (B) Below 1 ohms B11-6 (E) - Body ground Below 1 ohms 1Z-9 or B11-7 (B) - Body ground 10 kohms or higher Check the wire harness between the headlight (clearance RH) and front light ECU, and the headlight (clearance RH) and body ground. Disconnect the 1Z junction block connector. Disconnect the B2 headlight connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition 1Z-8 - B2-7 (B) Below 1 ohms B2-6 (E) - Body ground Below 1 ohms 1Z-8 or B2-7 (B) - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
7. PERFORM ACTIVE TEST USING TECHSTREAM (TAILLIGHT AND LICENSE LIGHT) Select the ACTIVE TEST, use the Techstream to generate a control command, and then check that the taillight and license light illuminates. BODY NO. 4 (REAR MULTIPLEX NETWORK ECU) Item Test Details Diagnostic Note Tail Light Taillight ON / OFF - License Light License light ON / OFF - OK Light illuminates. RESULT Result Proceed to OK A All lights do not illuminate B Taillights (inner LH or inner RH) do not illuminate C Taillights (outer LH or outer RH) do not illuminate D License plate light does not illuminate E E --> See step 14 D --> See step 12 C --> See step 10 B --> See step 8 A --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
8. INSPECT FUSE (RR TAIL) Remove the RR TAIL fuse from the rear multiplex network ECU. Measure the resistance of the fuse. Standard resistance Below 1 ohms NG --> REPLACE FUSE OK: Go to next step
9. CHECK WIRE HARNESS (REAR MULTIPLEX NETWORK ECU - BATTERY AND BODY GROUND) Disconnect the LB and LF ECU connectors. Measure the voltage of the wire harness side connectors. Standard voltage Tester Connection Specified Condition LB-1 (TLIN) - LF-1 (PGND) 10 to 14 V Measure the voltage of the wire harness side connectors. Standard voltage Tester Connection Specified Condition LF-1 (PGND) - Body ground Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
10. CHECK WIRE HARNESS (REAR MULTIPLEX NETWORK ECU - REAR COMBINATION LIGHT AND BODY GROUND) Check the wire harness between the rear combination light (tail inner LH) and rear multiplex network ECU, and the rear combination light (tail inner LH) and body ground. Disconnect the LA ECU connector. Disconnect the Y2 combination light connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition LA-8 (TIL2) - Y2-2 Below 1 ohms LA-8 (TIL2) or Y2-2 - Body ground 10 kohms or higher Connect the LA ECU connector. Measure the resistance of the wire harness side connector. Standard resistance Tester Connection Specified Condition Y2-4 - Body ground Below 1 ohms Check the wire harness between the rear combination light (tail inner RH) and rear multiplex network ECU, and the rear combination light (tail inner RH) and body ground. Disconnect the LA ECU connector. Disconnect the Y9 combination light connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition LA-22 (TIL1) - Y9-2 Below 1 ohms LA-22 (TIL1) or Y9-2 - Body ground 10 kohms or higher Connect the LA ECU connector. Measure the resistance of the wire harness side connector. Standard resistance Tester Connection Specified Condition Y9-4 - Body ground Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
11. REPLACE REAR COMBINATION LIGHT (TAIL INNER LH OR TAIL INNER RH) Temporarily replace the rear combination light (tail inner LH or tail inner RH) with a new or normally functioning one. Check that the rear combination light illuminates. OK Light illuminates. OK --> END NG --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
12. CHECK WIRE HARNESS (REAR MULTIPLEX NETWORK ECU - COMBINATION LIGHT AND BODY GROUND) Check the wire harness between the rear combination light (tail outer LH) and rear multiplex network ECU, and the rear combination light (tail outer LH) and body ground. Disconnect the LG ECU connector. Disconnect the X1 combination light connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition LG-5 (TIL2) - X1-5 (TL) Below 1 ohms LG-5 (TIL2) or X1-5 (TL) - Body ground 10 kohms or higher Connect the LG ECU connector. Measure the resistance of the wire harness side connector. Standard resistance Tester Connection Specified Condition X1-6 (E) - Body ground Below 1 ohms Check the wire harness between the rear combination light (tail outer RH) and rear multiplex network ECU, and the rear combination light (tail outer RH) and body ground. Disconnect the LG ECU connector. Disconnect the X3 combination light connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition LG-5 (TIL2) - X3-5 (TL) Below 1 ohms LG-5 (TIL2) or X3-5 (TL) - Body ground 10 kohms or higher Connect the LG ECU connector. Measure the resistance of the wire harness side connector. Standard resistance Tester Connection Specified Condition X3-6 (E) - Body ground Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
13. REPLACE REAR COMBINATION LIGHT (TAIL OUTER LH OR TAIL OUTER RH) Temporarily replace the rear combination light (tail outer LH or tail outer RH) with a new or normally functioning one. Check that the rear combination light illuminates. OK Light illuminates. OK --> END NG --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
14. CHECK WIRE HARNESS (REAR MULTIPLEX NETWORK ECU - LICENSE PLATE LIGHT AND BODY GROUND) Disconnect the LA ECU connector. Disconnect the Y4 license light connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition LA-10 (LCE1) - Y4-1 Below 1 ohms LA-10 (LCE1) or Y4-1 - Body ground 10 kohms or higher Connect the LA ECU connector. Measure the resistance of the wire harness side connector. Standard resistance Tester Connection Specified Condition Y4-2 - Body ground Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
15. REPLACE LICENSE PLATE LIGHT Temporarily replace the license plate light with a new or normally functioning one. Check that the light illuminates. OK Light illuminates. OK --> END NG --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

The rear multiplex network ECU receives stop light switch information from the stop light switch and turns on the stop light.

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