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Home >> Toyota >> 2021 >> C-HR Limited >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting System (W/ AFS) - Diagnostic Codes & Circuit Tests >> LIGHTING SYSTEM (w/ AFS) >> Power Source Circuit [09/2019 - 08/2020] >> Procedure

Power Source Circuit [09/2019 - 08/2020]: Procedure

  1. CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY - POWER SOURCE AND BODY GROUND) 
    1. Disconnect the A95*1 or A16*2 headlight ECU sub-assembly LH connector.
      1. *1: for TMMT Made
      2. *1: for TMC Made
    2. Disconnect the A17 headlight ECU sub-assembly RH connector.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      HEADLIGHT ECU SUB-ASSEMBLY LH

      Tester Connection Switch Condition Specified Condition
      A95-13 (ECUB) - Body ground*1 Engine switch on (IG) 11 to 14 V
      A95-4 (IG) - Body ground*1 Engine switch on (IG) 11 to 14 V
      A16-13 (ECUB) - Body ground*2 Engine switch on (IG) 11 to 14 V
      A16-4 (IG) - Body ground*2 Engine switch on (IG) 11 to 14 V
      1. *1: for TMMT Made
      2. *1: for TMC Made
      HEADLIGHT ECU SUB-ASSEMBLY RH

      Tester Connection Switch Condition Specified Condition
      A17-13 (ECUB) - Body ground Engine switch on (IG) 11 to 14 V
      A17-4 (IG) - Body ground Engine switch on (IG) 11 to 14 V
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      HEADLIGHT ECU SUB-ASSEMBLY LH

      Tester Connection Condition Specified Condition
      A95-12 (GND) - Body ground*1 Always Below 1 Ω
      A16-12 (GND) - Body ground*2 Always Below 1 Ω
      1. *1: for TMMT Made
      2. *1: for TMC Made
      HEADLIGHT ECU SUB-ASSEMBLY RH

      Tester Connection Condition Specified Condition
      A17-12 (GND) - Body ground Always Below 1 Ω

      Result

      Result Proceed to
      OK A
      NG (Headlight ECU Sub-assembly LH) B
      NG (Headlight ECU Sub-assembly RH) C

    Result: 

    A 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [09/2019 - 08/2020] 

    Result: 

    C 

    See step  6

    Result: 

    B 

    See step  2

  2. INSPECT NO. 1 INTEGRATION RELAY (H-LP LH RELAY) 
    1. Remove the No. 1 integration relay from the No. 1 engine room relay block.

      Refer to REMOVAL [02/2017 - 08/2020]

    2. Inspect the No. 1 integration relay.

      Refer to INSPECTION [02/2017 - ]

      OK

      No. 1 integration relay is normal.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE NO. 1 INTEGRATION RELAY. Refer to  REMOVAL [02/2017 - 08/2020] 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY (H-LP LH RELAY) - BATTERY) 
    1. Measure the voltage according to the value(s) in the chart below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      1A-5 - Body ground Always 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 
    1. Disconnect the 3F instrument panel junction block assembly connector.
    2. Measure the resistance according to the value(s) in the chart below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1B-2 - 3F-31 Always Below 1 Ω
      1B-2 or 3F-31 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    1. Remove the instrument panel junction block assembly.

      Refer to REMOVAL [10/2017 - 08/2020]

    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
    3. Measure the resistance according to the value(s) in the chart below.
      GTY774312Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Instrument Panel Junction Block Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      3F-31 - MB-15 (HRLY) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [10/2017 - 08/2020] 

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [10/2017 - 08/2020] 

  6. INSPECT NO. 1 INTEGRATION RELAY (H-LP RH RELAY) 
    1. Remove the No. 1 integration relay from the No. 1 engine room relay block.

      Refer to REMOVAL [02/2017 - 08/2020]

    2. Inspect the No. 1 integration relay.

      Refer to INSPECTION [02/2017 - ]

      OK

      No. 1 integration relay is normal.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE NO. 1 INTEGRATION RELAY. Refer to  REMOVAL [02/2017 - 08/2020] 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY (H-LP RH RELAY) - BATTERY) 
    1. Measure the voltage according to the value(s) in the chart below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      1B-8 - Body ground Always 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the F15 main body ECU (multiplex network body ECU) connector.
    2. Measure the resistance according to the value(s) in the chart below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1A-11 - F15-1 (DIM) Always Below 1 Ω
      1A-11 or F15-1 (DIM) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [10/2017 - 08/2020] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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