Winddow Defogger (Diagnostics): Diagnosis Lexus GS III facelift

HOW TO PROCEED WITH TROUBLESHOOTING

HINT

1. Use these procedures to troubleshoot the defogger system.
2. *: Use the Techstream.

1. VEHICLE BROUGHT TO WORKSHOP NEXT: Go to next step
2. INSPECT BATTERY VOLTAGE Standard voltage 11 to 14 V If the voltage is below 11 V, recharge or replace the battery before proceeding. NEXT: Go to next step
3. INSPECT COMMUNICATION FUNCTION OF LARGE-SCALE MULTIPLEX COMMUNICATION SYSTEM (BEAN)* Use the Techstream to check that the Multiplex Communication System (MPX) is functioning normally. Result Result Proceed to MPX DTC is not output A MPX DTC is output B B --> Go to MULTIPLEX COMMUNICATION SYSTEM A: Go to next step
4. PROBLEM SYMPTOMS TABLE 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 6 A: Go to next step
5. OVERALL ANALYSIS AND TROUBLESHOOTING* Terminals of ECU. Refer to «TERMINALS OF ECU»(ref-382863-S06814593822011012800000) Data List / Active Test. Refer to «DATA LIST / ACTIVE TEST»(ref-382863-S34564828632011012800000) On-vehicle Inspection. Refer to «ON-VEHICLE INSPECTION»(ref-382863-S35422147272011012800000) Inspection Refer to «ON-VEHICLE INSPECTION»(ref-382862-S10249340872011012800000) NEXT: Go to next step
6. REPAIR OR REPLACE NEXT: Go to next step
7. CONFIRMATION TEST NEXT --> END

PROBLEM SYMPTOMS TABLE

HINT

Use the table below to help determine the cause of the problem symptom. 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.

Problem Symptom

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1. CHECK ECM (2GR-FSE) Measure the resistance and voltage according to the value(s) in the table below. Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition E1 (E7-7) - Body ground BR - Body ground Ground Always Below 1 ohms E01 (E6-2) - Body ground W-B - Body ground Ground Always Below 1 ohms E02 (E6-1) - Body ground W-B - Body ground Ground Always Below 1 ohms E03 (E8-6) - Body ground W-B - Body ground Ground Always Below 1 ohms E04 (E45-5) - Body ground W-B - Body ground Ground Always Below 1 ohms E05 (E45-3) - Body ground W-B - Body ground Ground Always Below 1 ohms EC (A53-2) - Body ground W-B - Body ground Ground Always Below 1 ohms ME01 (E8-4) - Body ground W-B - Body ground Ground Always Below 1 ohms BATT (A6-4) - E1 (E7-7) L - BR Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V +B (A6-6) - E1 (E7-7) B-R - BR Power source of ECM Engine switch off Below 1 V +B (A6-6) - E1 (E7-7) B-R - BR Power source of ECM Engine switch on (IG) 11 to 14 V +B1 (A6-5) - E1 (E7-7) B-R - BR Power source of ECM Engine switch off Below 1 V +B1 (A6-5) - E1 (E7-7) B-R - BR Power source of ECM Engine switch on (IG) 11 to 14 V IGSW (A6-17) - E1 (E7-7) B-W - BR Ignition power supply Engine switch off Below 1 V IGSW (A6-17) - E1 (E7-7) B-W - BR Ignition power supply Engine switch on (IG) 11 to 14 V RDEF (A7-13) - E1 (E7-7) G-B - BR DEFOG relay Engine switch off Below 1 V RDEF (A7-13) - E1 (E7-7) G-B - BR DEFOG relay Engine switch on (IG) 11 to 14 V If the result is not as specified, the ECM may have a malfunction.
2. CHECK ECM (1UR-FSE) Measure the voltage and resistance according to the value(s) in the table below. Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition E1 (E86-1) - Body ground W-B - Body ground Ground Always Below 1 ohms E2 (E84-28) - Body ground BR - Body ground Ground Always Below 1 ohms E01 (E85-2) - Body ground W-B - Body ground Ground Always Below 1 ohms E02 (E85-1) - Body ground W-B - Body ground Ground Always Below 1 ohms E03 (A7-5) - Body ground W-B - Body ground Ground Always Below 1 ohms EC (A6-1) - Body ground W-B - Body ground Ground Always Below 1 ohms ME01 (E85-4) - Body ground W-B - Body ground Ground Always Below 1 ohms BATT (A6-7) - E1 (E86-1) L - W-B Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V +B (A7-2) - E1 (E86-1) B-R - W-B Power source of ECM Engine switch off Below 1 V +B (A7-2) - E1 (E86-1) B-R - W-B Power source of ECM Engine switch on (IG) 11 to 14 V +B2 (A7-1) - E1 (E86-1) B-R - W-B Power source of ECM Engine switch off Below 1 V +B2 (A7-1) - E1 (E86-1) B-R - W-B Power source of ECM Engine switch on (IG) 11 to 14 V IGSW (A6-8) - E1 (E86-1) B-W - W-B Ignition power supply Engine switch off Below 1 V IGSW (A6-8) - E1 (E86-1) B-W - W-B Ignition power supply Engine switch on (IG) 11 to 14 V RDEF (A7-35) - E1 (E86-1) G-B - W-B DEFOG relay Engine switch off Below 1 V RDEF (A7-35) - E1 (E86-1) G-B - W-B DEFOG relay Engine switch on (IG) 11 to 14 V If the result is not as specified, the ECM may have a malfunction.
3. CHECK A/C AMPLIFIER ASSEMBLY (A/C ECU) Disconnect the K52 amplifier connector. Measure the voltage and resistance according to the value(s) in the table below. Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition IG+ (K52-21) - GND (K52-20) W - W-B Ignition power supply Engine switch on (IG) 11 to 14 V IG+ (K52-21) - GND (K52-20) W - W-B Ignition power supply Engine switch off Below 1 V B (K52-1) - GND (K52-20) L - W-B Battery power supply Always 11 to 14 V GND (K52-20) - 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.
4. CHECK MULTI-DISPLAY Disconnect the K46 multi-display connector. Measure the voltage and resistance according to the value(s) in the table below. Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition IG (K46-3) - GND1 (K46-10) B - W-B Ignition power supply Engine switch on (IG) 11 to 14 V IG (K46-3) - GND1 (K46-10) B - W-B Ignition power supply Engine switch off Below 1 V +B1 (K46-1) - GND1 (K46-10) BE - W-B Battery power supply Always 11 to 14 V GND1 (K46-10) - 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.
5. CHECK IGNITION CONTROL ECU ASSEMBLY Disconnect the K73 ECU connector. Measure the voltage and resistance according to the value(s) in the table below. Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition AM1 (K73-33) - Body ground BE - Body ground +B power supply Always 11 to 14 V GND2 (K73-6) - 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 K73 ECU connector. Measure the voltage according to the value(s) in the table below. Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition IG1D (K73-34) - GND2 (K73-6) SB - W-B IG1 control signal Engine switch on (ACC) Below 1 V IG1D (K73-34) - GND2 (K73-6) SB - W-B IG1 control signal Engine switch off 11 to 14 V If the result is not as specified, the ECU may have a malfunction.

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1. DESCRIPTION The defogger system data can be read through the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the Techstream to check for malfunctions and perform repairs.
2. CHECK DLC3 The vehicle uses the ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format. Standard voltage Symbols (Terminal No.) Terminal Description Condition Specified Condition SIL (7) - SG (5) Bus "+" line During transmission Pulse generation BAT (16) - Body ground Battery positive Always 11 to 14 V Standard resistance Symbols (Terminal No.) Terminal Description Condition Specified Condition CG (4) - Body ground Chassis ground Always Below 1 ohms SG (5) - Body ground Signal ground Always Below 1 ohms CANH (6) - CANL (14) CAN bus line Engine switch off 54 to 67 ohms CANH (6) - Battery positive (+) HIGH-level CAN bus line Engine switch off 1 Mohms or higher CANH (6) - CG (4) HIGH-level CAN bus line Engine switch off 3 Mohms or higher CANL (14) - Battery positive (+) LOW-level CAN bus line Engine switch off 1 Mohms or higher CANL (14) - CG (4) LOW-level CAN bus line Engine switch off 3 Mohms or higher If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector. HINT: Connect the cable of the Techstream to the DLC3, turn the engine switch on (IG) and attempt to use the Techstream. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the Techstream. If communication is normal when the Techstream is connected to another vehicle, inspect the DLC3 of the original vehicle. If communication is still not possible when the Techstream is connected to another vehicle, the problem may be in the Techstream itself. Consult the Service Department listed in the Techstream's instruction manual.

DATA LIST / ACTIVE TEST

1. PERFORM ACTIVE TEST HINT: Performing the Techstream's ACTIVE TEST allows relay, VSV, actuator and other items to be operated without removing any parts. Performing the ACTIVE TEST early in troubleshooting is one way to save time. The DATA LIST can be displayed during the ACTIVE TEST. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Perform the ACTIVE TEST according to the display on the Techstream. A/C Amplifier Assembly (A/C ECU) Tester Display Test Part Control Range Diagnostic Note Defogger Relay (Rear) Operate rear window defogger OFF/ON

ON-VEHICLE INSPECTION

1. CHECK REAR WINDOW DEFOGGER SYSTEM OPERATION When the engine switch is on (IG) and the defogger switch is ON, check that the rear window defogger operates. HINT: After 15 minutes, check that the defogger automatically turns OFF.