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Home >> Toyota >> 2020 >> Avalon Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 20 (Lighting System (Interior) - Diagnostics & Circuit Tests (Hybrid)) >> LIGHTING SYSTEM (for HV Model) >> Circuit Tests >> Ambient Illumination Light Circuit [04/2018 - ] >> Procedure

Ambient Illumination Light Circuit [04/2018 - ]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Main Body / Active Test.
    5. Perform the Active Test according to the display on the Techstream.

      Body Electrical > Main Body > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Fr Foot Light
      • Front door inside handle illumination light assembly
      • Center console light (for passenger side) (No. 2 interior illumination light sub-assembly)
      • Center console light (for driver side) (No. 3 interior illumination light sub-assembly)
      • Cup holder light (No. 4 interior illumination light sub-assembly)
      		 OFF or ON Preconditions for using the Active Test to check dimmer controlled illumination:
      • Power switch on (IG)
      • Ambient illumination lights turned off using the mood switch

      Body Electrical > Main Body > Active Test 

      Tester Display
      Fr Foot Light

      OK

      Front door inside handle illumination lights, center console lights and cup holder lights come on.

      Result

      Result Proceed to
      OK A
      NG (Front door inside handle illumination light LH does not come on) B
      NG (Front door inside handle illumination light RH does not come on) C
      NG (Center console light (for passenger side) does not come on) D
      NG (Center console light (for driver side) does not come on) E
      NG (Cup holder light (for front side) does not come on) F
      NG (Cup holder light (for rear side) does not come on) G
      NG (Front door inside handle illumination lights, center console lights and cup holder lights do not come on) H

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 - ] 

    Result: 

    C 

    See step  4

    Result: 

    D 

    See step  6

    Result: 

    E 

    See step  8

    Result: 

    F 

    See step  10

    Result: 

    G 

    See step  12

    Result: 

    H 

    See step  14

    Result: 

    B 

    See step  2

  2. INSPECT FRONT DOOR INSIDE HANDLE ILLUMINATION LIGHT ASSEMBLY LH 
    1. Remove the front door inside handle illumination light assembly LH.

      Refer to REMOVAL [04/2018 - ]

    2. Inspect the front door inside handle illumination light assembly LH.

      Refer to INSPECTION [04/2018 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FRONT DOOR INSIDE HANDLE ILLUMINATION LIGHT ASSEMBLY LH. Refer to  REMOVAL [04/2018 - ] 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - FRONT DOOR INSIDE HANDLE ILLUMINATION LIGHT ASSEMBLY LH) 
    1. Disconnect the 4A and 4D instrument panel junction block assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      4D-24 - I26-1 (+) Always Below 1 Ω
      4A-36 - I26-2 (-) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  4. INSPECT FRONT DOOR INSIDE HANDLE ILLUMINATION LIGHT ASSEMBLY RH 
    1. Remove the front door inside handle illumination light assembly RH.

      Refer to REMOVAL [04/2018 - ]

    2. Inspect the front door inside handle illumination light assembly RH.

      Refer to INSPECTION [04/2018 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FRONT DOOR INSIDE HANDLE ILLUMINATION LIGHT ASSEMBLY RH. Refer to  REMOVAL [04/2018 - ] 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - FRONT DOOR INSIDE HANDLE ILLUMINATION LIGHT ASSEMBLY RH) 
    1. Disconnect the 4A and 4D instrument panel junction block assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      4D-24 - I10-1 (+) Always Below 1 Ω
      4A-36 - I10-2 (-) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. INSPECT CENTER CONSOLE LIGHT (for Passenger Side) (NO. 2 INTERIOR ILLUMINATION LIGHT SUB-ASSEMBLY) 
    1. Remove the center console light (for passenger side) (No. 2 interior illumination light sub-assembly).

      Refer to REMOVAL [04/2018 - ]

    2. Inspect the center console light (for passenger side) (No. 2 interior illumination light sub-assembly).

      Refer to INSPECTION [04/2018 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE CENTER CONSOLE LIGHT (for Passenger Side) (NO. 2 INTERIOR ILLUMINATION LIGHT SUB-ASSEMBLY). Refer to  REMOVAL [04/2018 - ] 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - CENTER CONSOLE LIGHT (for Passenger Side)) 
    1. Disconnect the 4A and 4D instrument panel junction block assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      4D-24 - G67-1 (+) Always Below 1 Ω
      4A-36 - G67-2 (-) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  8. INSPECT CENTER CONSOLE LIGHT (for Driver Side) (NO. 3 INTERIOR ILLUMINATION LIGHT SUB-ASSEMBLY) 
    1. Remove the center console light (for driver side) (No. 3 interior illumination light sub-assembly).

      Refer to REMOVAL [04/2018 - ]

    2. Inspect the center console light (for driver side) (No. 3 interior illumination light sub-assembly).

      Refer to INSPECTION [04/2018 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE CENTER CONSOLE LIGHT (for Driver Side) (NO. 3 INTERIOR ILLUMINATION LIGHT SUB-ASSEMBLY). Refer to  REMOVAL [04/2018 - ] 

    Result: 

    OK 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - CENTER CONSOLE LIGHT (for Driver Side)) 
    1. Disconnect the 4A and 4D instrument panel junction block assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      4D-24 - G66-1 (+) Always Below 1 Ω
      4A-36 - G66-2 (-) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  10. INSPECT CUP HOLDER LIGHT (for Front Side) (NO. 4 INTERIOR ILLUMINATION LIGHT SUB-ASSEMBLY) 
    1. Remove the cup holder light (for front side) (No. 4 interior illumination light sub-assembly).

      Refer to REMOVAL [04/2018 - ]

    2. Inspect the cup holder light (for front side) (No. 4 interior illumination light sub-assembly).

      Refer to INSPECTION [04/2018 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE CUP HOLDER LIGHT (for Front Side) (NO. 4 INTERIOR ILLUMINATION LIGHT SUB-ASSEMBLY). Refer to  REMOVAL [04/2018 - ] 

    Result: 

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - CUP HOLDER LIGHT (for Front Side)) 
    1. Disconnect the 4A and 4D instrument panel junction block assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      4D-24 - G64-1 (+) Always Below 1 Ω
      4A-36 - G64-2 (-) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  12. INSPECT CUP HOLDER LIGHT (for Rear Side) (NO. 4 INTERIOR ILLUMINATION LIGHT SUB-ASSEMBLY) 
    1. Remove the cup holder light (for rear side) (No. 4 interior illumination light sub-assembly).

      Refer to REMOVAL [04/2018 - ]

    2. Inspect the cup holder light (for rear side) (No. 4 interior illumination light sub-assembly).

      Refer to INSPECTION [04/2018 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE CUP HOLDER LIGHT (for Rear Side) (NO. 4 INTERIOR ILLUMINATION LIGHT SUB-ASSEMBLY). Refer to  REMOVAL [04/2018 - ] 

    Result: 

    OK 

    See step  13

  13. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - CUP HOLDER LIGHT (for Rear Side)) 
    1. Disconnect the 4A and 4D instrument panel junction block assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      4D-24 - G65-1 (+) Always Below 1 Ω
      4A-36 - G65-2 (-) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  14. CHECK HARNESS AND CONNECTOR (POWER SOURCE - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 
    1. Disconnect the 4K instrument panel junction block assembly connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      4K-1 - Body ground Power switch off 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  15

  15. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    GTY864423Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component without harness connected
    (Instrument Panel Junction Block Assembly)    		 - -
    1. Disconnect the 4D instrument panel junction block assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      4D-24 - 4K-1 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [04/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - ] 

    Result: 

    OK 

    See step  16

  16. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - AMBIENT ILLUMINATION LIGHT) 
    1. Disconnect the I26 front door inside handle illumination light assembly LH connector.
    2. Disconnect the I10 front door inside handle illumination light assembly RH connector.
    3. Disconnect the G67 center console light (for passenger side) (No. 2 interior illumination light sub-assembly) connector.
    4. Disconnect the G66 center console light (for driver side) (No. 3 interior illumination light sub-assembly) connector.
    5. Disconnect the G64 cup holder light (for front side) (No. 4 interior illumination light sub-assembly) connector.
    6. Disconnect the G65 cup holder light (for rear side) (No. 4 interior illumination light sub-assembly) connector.
    7. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      4D-24 - I26-1 (+) Always Below 1 Ω
      4D-24 - I10-1 (+) Always Below 1 Ω
      4D-24 - G64-1 (+) Always Below 1 Ω
      4D-24 - G65-1 (+) Always Below 1 Ω
      4D-24 - G66-1 (+) Always Below 1 Ω
      4D-24 - G67-1 (+) Always Below 1 Ω
      4A-36 - I26-2 (-) Always Below 1 Ω
      4A-36 - I10-2 (-) Always Below 1 Ω
      4A-36 - G64-2 (-) Always Below 1 Ω
      4A-36 - G65-2 (-) Always Below 1 Ω
      4A-36 - G66-2 (-) Always Below 1 Ω
      4A-36 - G67-2 (-) Always Below 1 Ω
      4D-24, I26-1 (+), I10-1 (+), G64-1 (+), G65-1 (+), G66-1 (+) or G67-1 (+) - Body ground Always 10 kΩ or higher
      4A-36, I26-2 (-), I10-2 (-), G64-2 (-), G65-2 (-), G66-2 (-) or G67-2 (-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  17

  17. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    GTY869673Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component without harness connected
    (Instrument Panel Junction Block Assembly)    		 - -
    1. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

      Refer to REMOVAL [04/2018 - 08/2021] , or refer to REMOVAL [08/2021 - ]

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      4A-36 - MB-26 (FSPT) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [04/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - ] 

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [04/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - ] 

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