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Home >> Toyota >> 2024 >> Corolla LE >> Repair and Diagnosis >> External Pages >> Different car >> Section 177 (Front Camera System (Early 2023, TMC) - Diagnostic Codes & Circuit Tests) >> FRONT CAMERA SYSTEM (for TMC Made) >> Steering Pad Switch Circuit [09/2022 - 11/2022] >> Procedure

Steering Pad Switch Circuit [09/2022 - 11/2022]: Procedure

WARNING: This page is about a different car, the 2023 Toyota GR Corolla and 2023 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
  1. CONFIRM PROBLEM SYMPTOMS 
    1. Check the problem symptoms.

      Result

      Result Proceed to
      All switches cannot be operated A
      Driving assist switch, +RES switch, -Switch, CANCEL switch cannot be operated B
      Only driving assist switch cannot be operated C
      Only +RES switch cannot be operated
      Only -switch cannot be operated
      Only CANCEL switch cannot be operated
      Only driving assist mode select switch cannot be operated
      Only vehicle-to-vehicle distance switch cannot be operated
      Only LTA switch cannot be operated
      Driving assist mode select switch, vehicle-to-vehicle distance switch, and LTA switch cannot be operated D

    Result: 

    B 

    See step  6

    Result: 

    C 

    REPLACE STEERING PAD SWITCH ASSEMBLY 

    for G16E-GTS: Refer to REMOVAL [09/2022 - ]

    except G16E-GTS: Refer to REMOVAL [09/2022 - 11/2022]

    Result: 

    D 

    See step  10

    Result: 

    A 

    See step  2

  2. INSPECT STEERING PAD SWITCH ASSEMBLY 

    for G16E-GTS: Refer to INSPECTION [09/2022 - ]

    except G16E-GTS: Refer to INSPECTION [09/2022 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE STEERING PAD SWITCH ASSEMBLY 

    for G16E-GTS: Refer to REMOVAL [09/2022 - ]

    except G16E-GTS: Refer to REMOVAL [09/2022 - 11/2022]

    Result: 

    OK 

    See step  3

  3. INSPECT SPIRAL CABLE SUB-ASSEMBLY 

    Refer to INSPECTION [06/2018 - ]

    Result

    Result Proceed to
    OK (for Gasoline Model) A
    OK (for HV Model) B
    NG C

    Result: 

    B 

    See step  5

    Result: 

    C 

    REPLACE SPIRAL CABLE SUB-ASSEMBLY 

    Refer to REMOVAL [09/2022 - 11/2022]

    Result: 

    A 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - ECM) 
    1. Disconnect the A47*1 or A139*2 ECM connector.
      1. *1: for M20A-FKS
      2. *2: for G16E-GTS
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR M20A-FKS

      Tester Connection Condition Specified Condition
      I82-2 (ECC) - G47-28 (ECCS) Always Below 1 Ω
      I82-2 (ECC) or G47-28 (ECCS) - Body ground Always 10 kΩ or higher
      FOR G16E-GTS

      Tester Connection Condition Specified Condition
      I82-2 (ECC) - A139-28 (ECCS) Always Below 1 Ω
      I82-2 (ECC) or A139-28 (ECCS) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

    Refer to PROBLEM SYMPTOMS TABLE [09/2022 - 11/2022]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  5. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - HYBRID VEHICLE CONTROL ECU) 
    1. Disconnect the I3 hybrid vehicle control ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I82-2 (ECC) - I3-43 (CCSG) Always Below 1 Ω
      I82-2 (ECC) or I3-43 (CCSG) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

    Refer to PROBLEM SYMPTOMS TABLE [09/2022 - 11/2022]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. INSPECT STEERING PAD SWITCH ASSEMBLY 

    for G16E-GTS: Refer to INSPECTION [09/2022 - ]

    except G16E-GTS: Refer to INSPECTION [09/2022 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE STEERING PAD SWITCH ASSEMBLY 

    for G16E-GTS: Refer to REMOVAL [09/2022 - ]

    except G16E-GTS: Refer to REMOVAL [09/2022 - 11/2022]

    Result: 

    OK 

    See step  7

  7. INSPECT SPIRAL CABLE SUB-ASSEMBLY 

    Refer to INSPECTION [06/2018 - ]

    Result

    Result Proceed to
    OK (for Gasoline Model) A
    OK (for HV Model) B
    NG C

    Result: 

    B 

    See step  9

    Result: 

    C 

    REPLACE SPIRAL CABLE SUB-ASSEMBLY 

    Refer to REMOVAL [09/2022 - 11/2022]

    Result: 

    A 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - ECM) 
    1. Disconnect the A47*1 or A139*2 ECM connector.
      1. *1: for M20A-FKS
      2. *2: for G16E-GTS
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR M20A-FKS

      Tester Connection Condition Specified Condition
      I82-13 (CCS) - G47-27 (CCS) Always Below 1 Ω
      I82-13 (CCS) or G47-27 (CCS) - Body ground Always 10 kΩ or higher
      FOR G16E-GTS

      Tester Connection Condition Specified Condition
      I82-13 (CCS) - A139-27 (CCS) Always Below 1 Ω
      I82-13 (CCS) or A139-27 (CCS) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM 

    for M20A-FKS: Refer to REMOVAL [09/2022 - 11/2022]

    for G16E-GTS: Refer to REMOVAL [09/2022 - 11/2022]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  9. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - HYBRID VEHICLE CONTROL ECU) 
    1. Disconnect the I3 hybrid vehicle control ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I82-13 (CCS) - I3-29 (CCS) Always Below 1 Ω
      I82-13 (CCS) or I3-29 (CCS) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU 

    Refer to REMOVAL [09/2022 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  10. INSPECT STEERING PAD SWITCH ASSEMBLY 

    for G16E-GTS: Refer to INSPECTION [09/2022 - ]

    except G16E-GTS: Refer to INSPECTION [09/2022 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE STEERING PAD SWITCH ASSEMBLY 

    for G16E-GTS: Refer to REMOVAL [09/2022 - ]

    except G16E-GTS: Refer to REMOVAL [09/2022 - 11/2022]

    Result: 

    OK 

    See step  11

  11. INSPECT SPIRAL CABLE SUB-ASSEMBLY 

    Refer to INSPECTION [06/2018 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE SPIRAL CABLE SUB-ASSEMBLY 

    Refer to REMOVAL [09/2022 - 11/2022]

    Result: 

    OK 

    See step  12

  12. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - FORWARD RECOGNITION CAMERA) 
    1. Disconnect the T21 forward recognition camera connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I82-6 (DIST) - T21-5 (LKSW) Always Below 1 Ω
      I82-6 (DIST) or T21-5 (LKSW) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE FORWARD RECOGNITION CAMERA 

    Refer to REMOVAL [09/2022 - 11/2022]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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