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Home >> Lexus >> 2008 >> LS 460 >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting >> Lighting System >> DTC B2402 Transistor Relay Overload Malfunction >> Inspection Procedure

Inspection Procedure

  1. READ VALUE USING TECHSTREAM (REAR JUNCTION BLOCK ECU) 
    1. Using the Techstream, read the Data List.

    Body No.4 

    DATA LIST

    Tester Display Measurement Item/Range Normal Condition Diagnostic Note
    Tail Light Tr States of taillight/OK or Break OK: Taillight circuit is normal
    Break: Taillight circuit is malfunctioning    		 Confirm that headlight dimmer switch is ON (TAIL or HEAD)
    Stop Light Tr States of stop light/OK or Break OK: Stop light circuit is normal
    Break: Stop light circuit is malfunctioning    		 Confirm that brake pedal is pressed
    High Mount Stop Light Tr States of high mount stop light/ OK or Break OK: High mount stop light circuit is normal
    Break: High mount stop light circuit is malfunctioning    		 Confirm that brake pedal is pressed

    Result: 

    RESULT CHART

    Result Proceed To
    Item (TAIL LGT Tr.) displays "Break" on the Techstream A
    Item (STOP LGT Tr.) displays "Break" is on the Techstream B
    Item (H-M STP LGT Tr.) displays "Break" on the Techstream C
    All items display "OK" on the Techstream D

    B:  Go to step  4

    C:  Go to step  6

    D:  Go to step  8

    A: Go to Next Step 

  2. READ VALUE USING TECHSTREAM (TAILLIGHT AND LICENSE PLATE LIGHT) 
    1. Disconnect the connectors in the following order: Rear combination light (LH, RH), rear light (LH, RH), license plate light.
    2. Using the Techstream, read the Data List.

    Body No.4 

    DATA LIST

    Tester Display Measurement Item/Range Normal Condition Diagnostic Note
    Tail Light Tr States of taillight/OK or Break OK: Taillight circuit is normal
    Break: Taillight circuit is malfunctioning    		 Confirm that headlight dimmer switch is ON (TAIL or HEAD)

    Result: 

    RESULT CHART

    Disconnected Light Result Proceed To
    • Rear combination light
    • Rear light
    • License plate light
    		 Displayed "Break" on the Techstream A
    Rear combination light Displayed "OK" is on the Techstream B
    Rear light Displayed "OK" is on the Techstream C
    License plate light Displayed "OK" is on the Techstream D

    B: REPLACE REAR COMBINATION LIGHT  (See REAR COMBINATION LIGHT ASSEMBLY )

    C: REPLACE REAR LIGHT  (See REAR COMBINATION LIGHT ASSEMBLY )

    D: REPLACE LICENSE PLATE LIGHT  (See LICENSE PLATE LIGHT ASSEMBLY )

    A: Go to Next Step 

  3. READ VALUE USING TECHSTREAM (REAR JUNCTION BLOCK ECU) 
    1. Disconnect the connectors in the following order: rear junction block ECU connector S63, S64.
    2. Using the Techstream, read the Data List.

    Body No.4 

    DATA LIST

    Tester Display Measurement Item/Range Normal Condition Diagnostic Note
    Tail Light Tr States of taillight/OK or Break OK: Taillight circuit is normal
    Break: Taillight circuit is malfunctioning    		 Confirm that headlight dimmer switch is ON (TAIL or HEAD)

    Result: 

    RESULT CHART

    Result Proceed To
    "Break" display does not change A
    Changes to "Normal" display B

    B: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    A: REPLACE LUGGAGE ROOM JUNCTION BLOCK (REAR JUNCTION BLOCK ECU) 

  4. READ VALUE USING TECHSTREAM (STOP LIGHT) 
    1. Disconnect the connectors in the following order: rear combination light (LH, RH), rear light (LH, RH).
    2. Using the Techstream, read the Data List.

    Body No.4 

    DATA LIST

    Tester Display Measurement Item/Range Normal Condition Diagnostic Note
    Stop Light Tr States of stop light/OK or Break OK: Stop light circuit is normal
    Break: Stop light circuit is malfunctioning    		 Confirm that brake pedal is pressed

    Result: 

    RESULT CHART

    Disconnected Light Result Proceed To
    • Rear combination light
    • Rear light
    		 "Break" display does not change A
    Rear combination light Changes to "Normal" display B
    Rear light Changes to "Normal" display C

    HINT:

    Disconnect the RH connector, then the LH connector. If the display changes to "Normal", it can be determined that the disconnected light is malfunctioning.

    B: REPLACE REAR COMBINATION LIGHT ASSEMBLY  (See REAR COMBINATION LIGHT ASSEMBLY )

    C: REPLACE REAR LIGHT ASSEMBLY  (See REAR COMBINATION LIGHT ASSEMBLY )

    A: Go to Next Step 

  5. READ VALUE USING TECHSTREAM (REAR JUNCTION BLOCK ECU) 
    1. Disconnect the connectors in the following order: rear junction block ECU connector S63, S64.
    2. Using the Techstream, read the Data List.

    Body No.4 

    DATA LIST

    Tester Display Measurement Item/Range Normal Condition Diagnostic Note
    Stop Light Tr States of stop light/OK or Break OK: Stop light circuit is normal
    Break: Stop light circuit is malfunctioning    		 Confirm that brake pedal is pressed

    Result: 

    RESULT CHART

    Result Proceed To
    "Break" display does not change A
    Changes to "Normal" display B

    B: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    A: REPLACE LUGGAGE ROOM JUNCTION BLOCK (REAR JUNCTION BLOCK ECU) 

  6. READ VALUE USING TECHSTREAM (CENTER STOP LIGHT) 
    1. Disconnect the connectors in the following order: Center stop light.
    2. Using the Techstream, read the Data List.

    Body No.4 

    DATA LIST

    Tester Display Measurement Item/Range Normal Condition Diagnostic Note
    High Mount Stop Light Tr States of high mount stop light/ OK or Break OK: High mount stop light circuit is normal
    Break: High mount stop light circuit is malfunctioning    		 Confirm that brake pedal is pressed

    Result: 

    RESULT CHART

    Result Proceed To
    "Break" display does not change A
    Changes to "Normal" display B

    B: REPLACE CENTER STOP LIGHT ASSEMBLY  (See HIGH MOUNTED STOP LIGHT ASSEMBLY )

    A: Go to Next Step 

  7. READ VALUE USING TECHSTREAM (REAR JUNCTION BLOCK ECU) 
    1. Disconnect the connectors in the following order: rear junction block ECU connector S62.
    2. Using the Techstream, read the Data List.

    Body No.4 

    DATA LIST

    Tester Display Measurement Item/Range Normal Condition Diagnostic Note
    High Mount Stop Light Tr States of high mount stop light/ OK or Break OK: High mount stop light circuit is normal
    Break: High mount stop light circuit is malfunctioning    		 Confirm that brake pedal is pressed

    Result: 

    RESULT CHART

    Result Proceed To
    "Break" display does not change A
    Changes to "Normal" display B

    B: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    A: REPLACE LUGGAGE ROOM JUNCTION BLOCK (REAR JUNCTION BLOCK ECU) 

  8. CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT - REAR JUNCTION BLOCK ECU AND BODY GROUND) 
    1. Disconnect the S63 ECU connector.
    2. Disconnect the S37 light connector.
    3. Measure the resistance according to the value (s) in the table below.

    Standard Resistance 

    RESISTANCE SPECIFICATION CHART

    Tester Connection Condition Specified Condition
    S63-15 (LCE2) - S37-1 (B) Always Below 1 Ω
    S37-2 (E) - Body ground Always Below 1 Ω
    S63-15 (LCE2) - Body ground Always 10 kΩ or higher
    Fig 1: Identifying S63 ECU Connector And S37 Light Connector
    G04944630Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  9. CHECK HARNESS AND CONNECTOR (REAR LIGHT - REAR JUNCTION BLOCK ECU AND BODY GROUND) 
    1. Disconnect the S63 ECU connector.
    2. Disconnect the S33 and S41 light connectors.
    3. Measure the resistance according to the value (s) in the table below.

    Standard Resistance: 

    for LH 

    RESISTANCE SPECIFICATION CHART

    Tester Connection Condition Specified Condition
    S63-14 (TIL3) - S33-2 (11 P) Always Below 1 Ω
    S63-4 (STP3) - S33-1 (B) Always Below 1 Ω
    S33-4 (E) - Body ground Always Below 1 Ω
    S63-14 (TIL3) - Body ground Always 10 kΩ or higher
    S63-4 (STP3) - Body ground Always 10 kΩ or higher
    Fig 2: Identifying S63 ECU Connector And S33 With S41 Light Connectors
    G05855201Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    for RH 

    RESISTANCE SPECIFICATION CHART

    Tester Connection Condition Specified Condition
    S63-13 (TIL4) - S41-2 (T/ P) Always Below 1 Ω
    S63-4 (STP3) - S41-1 (B) Always Below 1 Ω
    S41-4 (E) - Body ground Always Below 1 Ω
    S63-13 (TIL4) - Body ground Always 10 kΩ or higher
    S63-4 (STP3) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  10. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT - REAR JUNCTION BLOCK ECU AND BODY GROUND) 
    1. Disconnect the S64 ECU connector.
    2. Disconnect the S51 and S52 light connectors.
    3. Measure the resistance according to the value (s) in the table below.

    Standard Resistance: 

    for LH 

    RESISTANCE SPECIFICATION CHART

    Tester Connection Condition Specified Condition
    S64-3 (TIL2) - S51-3 (TL) Always Below 1 Ω
    S64-9 (STP2) - S51-1 (STP) Always Below 1 Ω
    S51-4 (E) - Body ground Always Below 1 Ω
    S64-3 (TIL2) - Body ground Always 10 kΩ or higher
    S64-9 (STP2) - Body ground Always 10 kΩ or higher
    Fig 3: Identifying S51 And S52 Light Connectors With S64 ECU Connector
    G04944632Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    for RH 

    RESISTANCE SPECIFICATION CHART

    Tester Connection Condition Specified Condition
    S64-7 (TIL1) - S52-3 (TL) Always Below 1 Ω
    S64-10 (STP1) - S52-1 (STP) Always Below 1 Ω
    S52-4 (E) - Body ground Always Below 1 Ω
    S64-7 (TIL1) - Body ground Always 10 kΩ or higher
    S64-10 (STP1) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  11. CHECK HARNESS AND CONNECTOR (CENTER STOP LIGHT - REAR JUNCTION BLOCK ECU AND BODY GROUND) 
    1. Disconnect the S62 ECU connector.
    2. Disconnect the S20 light connector.
    3. Measure the resistance according to the value (s) in the table below.

    Standard Resistance 

    RESISTANCE SPECIFICATION CHART

    Tester Connection Condition Specified Condition
    S62-6 (STP4) - S20-1 (B) Always Below 1 Ω
    S20-2 (E) - Body ground Always Below 1 Ω
    S62-6 (STP4) - Body ground Always 10 kΩ or higher
    Fig 4: Identifying S62 ECU Connector And S20 Light Connector
    G04944633Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE LUGGAGE ROOM JUNCTION BLOCK (REAR JUNCTION BLOCK ECU) 

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