LIGHTING SYSTEM, Diagnostic DTC:B2402

DTC Code DTC Name
B2402 Transistor Relay Overload Malfunction

DESCRIPTION

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

When excessive current is detected, DTC B2402 is output.

Turning off the power switch clears the DTC.

DTC Code DTC Detection Condition Trouble Area
B2402 Transistor relay overload malfunction

  • Rear combination light assembly LH

  • Rear combination light socket and wire sub-assembly LH

  • Rear combination light assembly RH

  • Rear combination light socket and wire sub-assembly RH

  • Rear light assembly LH

  • Rear light socket and wire LH

  • Rear light assembly RH

    Rear light socket and wire RH

  • Center stop light assembly

  • License plate light assembly LH

  • License plate light assembly RH

  • Luggage room junction block assembly (rear junction block ECU)

  • Harness or connector

WIRING DIAGRAM

A000W64E05
A000V9GE01

PROCEDURE


  1. CHECK VEHICLE TYPE


    1. Check the vehicle type.

      Result
      Result Proceed to
      w/ Rear Fog Light A
      w/o Rear Fog Light B

    B

    READ VALUE USING GTS (TAILLIGHT, STOP LIGHT, CENTER STOP LIGHT AND BACK-UP LIGHT) Click here

    A

  2. READ VALUE USING GTS (REAR FOG LIGHT)


    1. Using the GTS, read the Data List Click here.

      Body No. 4
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Rear Fog Light Tr. Rear fog light illumination condition display/OK or Break

      OK: Rear fog light circuit is normal

      Break: Rear fog light circuit is malfunctioning

      		 -
      Result
      Result Proceed to
      Item (Rear Fog Light Tr.) displays "OK" on the GTS A
      Item (Rear Fog Light Tr.) displays "Break" is on the GTS B

    B

    READ VALUE USING GTS (REAR FOG LIGHT) Click here

    A

  3. READ VALUE USING GTS (TAILLIGHT, STOP LIGHT, CENTER STOP LIGHT AND BACK-UP LIGHT)


    1. Using the GTS, read the Data List Click here.

      Body No. 4
      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 position)
      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
      Backup Light Tr States of back-up light/OK or Break

      OK: Back-up light circuit is normal

      Break: Back-up light circuit is malfunctioning

      		 Confirm that shift lever in R
      Result
      Result Proceed to
      Item (Tail Light Tr.) displays "Break" on the GTS A
      Item (Stop Light Tr.) displays "Break" is on the GTS B
      Item (High Mount Stop Tr.) displays "Break" on the GTS C
      Item (Back-up Light Tr.) displays "Break" on the GTS D
      All items display "OK" on the GTS E

    B

    READ VALUE USING GTS (STOP LIGHT) Click here

    C

    READ VALUE USING GTS (CENTER STOP LIGHT) Click here

    D

    READ VALUE USING GTS (BACK-UP LIGHT) Click here

    E

    CHECK HARNESS AND CONNECTOR (REAR JUNCTION BLOCK ECU - LICENSE PLATE LIGHT LH) Click here

    A

  4. READ VALUE USING GTS (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. Operate the power switch as follows each time a connector is disconnected: on (IG) → off →on (IG).

    3. Using the GTS, read the Data List Click here.

      Body No. 4
      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 position)
      Result
      Disconnected Light Result Proceed to

      • Rear combination light

      • Rear light

      • License plate light

      		 Displayed "Break" on the GTS A
      Rear combination light Displayed "OK" is on the GTS B
      Rear light Displayed "OK" is on the GTS C
      License plate light LH and RH Displayed "OK" is on the GTS D

    B

    CHECK REAR COMBINATION LIGHT SOCKET AND WIRE SUB-ASSEMBLY Click here

    C

    CHECK REAR LIGHT SOCKET AND WIRE Click here

    D

    INSPECT LICENSE PLATE LIGHT ASSEMBLY LH Click here

    A

  5. READ VALUE USING GTS (TAILLIGHT)


    1. Disconnect the connectors in the following order: rear junction block ECU connector S63, S64.

    2. Operate the power switch as follows each time a connector is disconnected: on (IG) → off →on (IG).

    3. Using the GTS, read the Data List Click here.

      Body No. 4
      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 position)
      Result
      Result Proceed to
      "Break" display does not change A
      Changes to "Normal" display B

    A

    REPLACE LUGGAGE ROOM JUNCTION BLOCK (REAR JUNCTION BLOCK ECU)

    B

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  6. INSPECT LICENSE PLATE LIGHT ASSEMBLY LH


    1. Remove the license plate light LH Click here.

    2. Inspect the license plate light LH Click here.


    OK

    REPLACE LICENSE PLATE LIGHT ASSEMBLY RH Click here

    NG

    REPLACE LICENSE PLATE LIGHT ASSEMBLY LH Click here

  7. READ VALUE USING GTS (REAR FOG LIGHT)


    1. Disconnect the connectors in the following order: rear light (LH, RH).

    2. Operate the power switch as follows each time a connector is disconnected: on (IG) → off →on (IG).

    3. Using the GTS, read the Data List Click here.

      Body No. 4
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Rear Fog Light Tr. Rear fog light illumination condition display/OK or Break

      OK: Rear fog light circuit is normal

      Break: Rear fog light circuit is malfunctioning

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

    B

    CHECK REAR LIGHT SOCKET AND WIRE Click here

    A

  8. READ VALUE USING GTS (REAR FOG LIGHT)


    1. Disconnect the connectors in the following order: rear junction block ECU connector S63.

    2. Operate the power switch as follows each time a connector is disconnected: on (IG) → off →on (IG).

    3. Using the GTS, read the Data List Click here.

      Body No. 4
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Rear Fog Light Tr. Rear fog light illumination condition display/OK or Break

      OK: Rear fog light circuit is normal

      Break: Rear fog light circuit is malfunctioning

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

    A

    REPLACE LUGGAGE ROOM JUNCTION BLOCK (REAR JUNCTION BLOCK ECU)

    B

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  9. READ VALUE USING GTS (STOP LIGHT)


    1. Disconnect the connectors in the following order: rear combination light (LH, RH), rear light (LH, RH).

    2. Operate the power switch as follows each time a connector is disconnected: on (IG) → off →on (IG).

    3. Using the GTS, read the Data List Click here.

      Body No. 4
      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
      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

      Tech Tips

      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

    CHECK REAR COMBINATION LIGHT SOCKET AND WIRE SUB-ASSEMBLY Click here

    C

    CHECK REAR LIGHT SOCKET AND WIRE Click here

    A

  10. READ VALUE USING GTS (STOP LIGHT)


    1. Disconnect the connectors in the following order: rear junction block ECU connector S63, S64.

    2. Operate the power switch as follows each time a connector is disconnected: on (IG) → off →on (IG).

    3. Using the GTS, read the Data List Click here.

      Body No. 4
      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 Proceed to
      "Break" display does not change A
      Changes to "Normal" display B

    A

    REPLACE LUGGAGE ROOM JUNCTION BLOCK (REAR JUNCTION BLOCK ECU)

    B

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  11. READ VALUE USING GTS (CENTER STOP LIGHT)


    1. Disconnect the connectors in the following order: Center stop light.

    2. Operate the power switch as follows each time a connector is disconnected: on (IG) → off →on (IG).

    3. Using the GTS, read the Data List Click here.

      Body No. 4
      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 Proceed to
      "Break" display does not change A
      Changes to "Normal" display B

    B

    REPLACE CENTER STOP LIGHT ASSEMBLY Click here

    A

  12. READ VALUE USING GTS (CENTER STOP LIGHT)


    1. Disconnect the connectors in the following order: rear junction block ECU connector S62.

    2. Operate the power switch as follows each time a connector is disconnected: on (IG) → off →on (IG).

    3. Using the GTS, read the Data List Click here.

      Body No. 4
      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 Proceed to
      "Break" display does not change A
      Changes to "Normal" display B

    A

    REPLACE LUGGAGE ROOM JUNCTION BLOCK (REAR JUNCTION BLOCK ECU)

    B

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  13. READ VALUE USING GTS (BACK-UP LIGHT)


    1. Disconnect the connectors in the following order: rear light (LH, RH).

    2. Operate the power switch as follows each time a connector is disconnected: on (IG) → off →on (IG).

    3. Using the GTS, read the Data List Click here.

      Body No. 4
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Backup Light Tr States of back-up light/OK or Break

      OK: Back-up light circuit is normal

      Break: Back-up light circuit is malfunctioning

      		 Confirm that shift lever in R
      Result
      Result Proceed to
      "Break" display does not change A
      Changes to "Normal" display B

    B

    CHECK REAR LIGHT SOCKET AND WIRE Click here

    A

  14. READ VALUE USING GTS (BACK-UP LIGHT)


    1. Disconnect the connectors in the following order: rear junction block ECU connector S63.

    2. Operate the power switch as follows each time a connector is disconnected: on (IG) → off →on (IG).

    3. Using the GTS, read the Data List Click here.

      Body No. 4
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Backup Light Tr States of back-up light/OK or Break

      OK: Back-up light circuit is normal

      Break: Back-up light circuit is malfunctioning

      		 Confirm that shift lever in R
      Result
      Result Proceed to
      "Break" display does not change A
      Changes to "Normal" display B

    A

    REPLACE LUGGAGE ROOM JUNCTION BLOCK (REAR JUNCTION BLOCK ECU)

    B

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  15. CHECK HARNESS AND CONNECTOR (REAR JUNCTION BLOCK ECU - LICENSE PLATE LIGHT LH)

    A000ZT3E01
    *1 Front view of wire harness connector: (to Rear Junction Block ECU)
    *2 Front view of wire harness connector: (to License Plate Light LH)

    1. Disconnect the S63 rear junction block ECU connector.

    2. Disconnect the S103 license plate light LH connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      S63-15 (LCE2) - S103-1 (B) Always Below 1 Ω
      S63-15 (LCE2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  16. CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT RH - LICENSE PLATE LIGHT LH AND BODY GROUND)

    A000XGIE02
    *1 Front view of wire harness connector: (to License Plate Light LH)
    *2 Front view of wire harness connector: (to License Plate Light RH)

    1. Disconnect the S103 license plate light LH connector.

    2. Disconnect the S104 license plate light RH connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      S103-2 (E) - S104-1 (B) Always Below 1 Ω
      S104-2 (E) - Body ground Always Below 1 Ω
      S103-2 (E) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  17. CHECK HARNESS AND CONNECTOR (REAR JUNCTION BLOCK ECU - REAR LIGHT AND BODY GROUND)

    A000UGNE05

    1. Disconnect the S63 rear junction block ECU connector.

    2. Disconnect the S33*1 and S41*2 rear light connectors.


      • *1: for LH

      • *2: for RH

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for LH
      Tester Connection Condition Specified Condition
      S63-13 (TIL4) - S33-2 (T/P) Always Below 1 Ω
      S33-4 (E) - Body ground Always Below 1 Ω
      S63-13 (TIL4) - Body ground Always 10 kΩ or higher
      S63-1 (BCK1) - S33-3 (B) Always Below 1 Ω
      S63-1 (BCK1) - Body ground Always 10 kΩ or higher
      S63-4 (STP3) - S33-1 (B) Always Below 1 Ω
      S33-4 (E) - Body ground Always Below 1 Ω
      S63-4 (STP3) - Body ground Always 10 kΩ or higher
      for RH
      Tester Connection Condition Specified Condition
      S63-14 (TIL3) - S41-2 (T/P) Always Below 1 Ω
      S41-4 (E) - Body ground Always Below 1 Ω
      S63-14 (TIL3) - Body ground Always 10 kΩ or higher
      S63-1 (BCK1) - S41-3 (B) Always Below 1 Ω
      S63-1 (BCK1) - Body ground Always 10 kΩ or higher
      S63-4 (STP3) - S41-1 (B) Always Below 1 Ω
      S41-4 (E) - Body ground Always Below 1 Ω
      S63-4 (STP3) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  18. CHECK HARNESS AND CONNECTOR (REAR JUNCTION BLOCK ECU - REAR COMBINATION LIGHT AND BODY GROUND)

    A000TUYE04

    1. Disconnect the S64 rear junction block ECU connector.

    2. Disconnect the S51*1 and S52*2 rear combination light connectors.


      • *1: for LH

      • *2: for RH

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for LH
      Tester Connection Condition Specified Condition
      S64-3 (TIL2) - S51-3 (TL) Always Below 1 Ω
      S64-3 (TIL2) - Body ground Always 10 kΩ or higher
      S64-9 (STP2) - S51-1 (STP) Always Below 1 Ω
      S51-4 (E) - Body ground Always Below 1 Ω
      S64-9 (STP2) - Body ground Always 10 kΩ or higher
      for RH
      Tester Connection Condition Specified Condition
      S64-7 (TIL1) - S52-3 (TL) 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) - S52-1 (STP) Always Below 1 Ω
      S64-10 (STP1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  19. CHECK HARNESS AND CONNECTOR (REAR JUNCTION BLOCK ECU - CENTER STOP LIGHT AND BODY GROUND)

    A000ZC6E02
    *1 Front view of wire harness connector: (to Rear Junction Block ECU)
    *2 Front view of wire harness connector: (to Center Stop Light)

    1. Disconnect the S62 rear junction block ECU connector.

    2. Disconnect the S20 center stop light connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      S62-6 (STP4) - S20-1 Always Below 1 Ω
      S20-2 - Body ground Always Below 1 Ω
      S62-6 (STP4) - Body ground Always 10 kΩ or higher

    OK

    REPLACE LUGGAGE ROOM JUNCTION BLOCK (REAR JUNCTION BLOCK ECU)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  20. CHECK REAR COMBINATION LIGHT SOCKET AND WIRE SUB-ASSEMBLY


    1. Temporarily replace the rear combination light socket and wire with a new or normally functioning one Click here.

    2. Check for DTC Click here.

      OK
      DTC B2402 output does not occur

    OK

    END (REAR COMBINATION LIGHT SOCKET AND WIRE WAS DEFECTIVE)

    NG

    REPLACE REAR COMBINATION LIGHT ASSEMBLY Click here

  21. CHECK REAR LIGHT SOCKET AND WIRE


    1. Temporarily replace the rear light socket and wire with a new or normally functioning one Click here.

    2. Check for DTC Click here.

      OK
      DTC B2402 output does not occur

    OK

    END (REAR LIGHT SOCKET AND WIRE WAS DEFECTIVE)

    NG

    REPLACE REAR LIGHT ASSEMBLY Click here