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Home >> Scion >> 2016 >> iA Automatic Trans >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting System (Exterior) - Diagnostic Codes (B121911 - B1D3586) >> Lighting System >> DTC B1277-11: Reverse Lamp circuit short to ground [07/2015 - ] >> Procedure

DTC B1277-11: Reverse Lamp circuit short to ground [07/2015 - ]: Procedure

  1. VISUALLY INSPECT BACK-UP LIGHT BULB (LH) 
    1. Visually inspect the back-up light bulb (LH).
    2. Is the back-up light bulb (LH) normal?

      Result

      Result
      Yes
      No

    Result:  2

    No 

    See step  15

    Result:  1

    Yes 

    See step  2

  2. VISUALLY INSPECT BACK-UP LIGHT BULB (RH) 
    1. Visually inspect the back-up light bulb (RH).
    2. Is the back-up light (RH) normal?

      Result

      Result
      Yes
      No

    Result:  2

    No 

    See step  14

    Result:  1

    Yes 

    See step  3

  3. INSPECT BACK-UP LIGHT (LH) CONNECTOR CONDITION 
    1. Switch the ignition off.
    2. Disconnect the negative battery cable.

      Refer to REMOVAL [07/2015 - ]

    3. Disconnect the back-up light (LH) connector.
    4. Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
    5. Is the connector normal?

      Result

      Result
      Yes
      No

    Result:  2

    No 

    See step  13

    Result:  1

    Yes 

    See step  4

  4. INSPECT BACK-UP LIGHT (RH) CONNECTOR CONDITION 
    1. Disconnect the back-up light (RH) connector.
    2. Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
    3. Is the connector normal?

      Result

      Result
      Yes
      No

    Result:  2

    No 

    See step  12

    Result:  1

    Yes 

    See step  5

  5. INSPECT POWER SOURCE CONTROL (POWER MANAGEMENT CONTROL ECU) CONNECTOR CONDITION 
    1. Disconnect the power source control (power management control ECU) connector.
    2. Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
    3. Is the connector normal?

      Result

      Result
      Yes
      No

    Result:  2

    No 

    See step  11

    Result:  1

    Yes 

    See step  6

  6. INSPECT BACK-UP LIGHT CONTROL CIRCUIT FOR SHORT TO GROUND 
    1. Verify that the back-up light (LH)/(RH) and power source control (power management control ECU) connectors are disconnected.
    2. Inspect for continuity between power source control (power management control ECU) terminal E3-12 (wiring harness-side) and body ground.
    3. Is there continuity?

      Result

      Result
      Yes
      No

    Result:  2

    Yes 

    See step  10

    Result:  1

    No 

    See step  7

  7. VERIFY THAT REPAIRS HAVE BEEN COMPLETED 
    1. Always reconnect all disconnected connectors.
    2. Connect the negative battery cable.

      Refer to REMOVAL [07/2015 - ]

    3. Clear the DTC for the power source control (power management control ECU) using the Techstream.

      Refer to DTC CHECK / CLEAR [07/2015 - ]

      Body Electrical > Electric Supply Unit > Clear DTCs 

    4. Perform the following operation.
      • Shift the selector lever to the R position. (ATX)
      • Shift the shift lever to the reverse position. (MTX)
    5. Retrieve the power source control (power management control ECU) DTCs using the Techstream.

      Refer to DTC CHECK / CLEAR [07/2015 - ]

      Body Electrical > Electric Supply Unit > Trouble Codes 

    6. Is the same DTC displayed?

      Result

      Result
      Yes
      No

    Result:  2

    Yes 

    See step  9

    Result:  1

    No 

    See step  8

  8. VERIFY IF OTHER DTCS DISPLAYED 
    1. Are any other DTCs displayed?

      Result

      Result
      Yes
      No

    Result:  1

    No 

    DTC TROUBLESHOOTING COMPLETED. 

    Result:  2

    Yes 

    REPAIR OR REPLACE THE MALFUNCTIONING PART ACCORDING TO THE APPLICABLE DTC TROUBLESHOOTING. 

    1. Refer to DIAGNOSTIC TROUBLE CODE CHART [07/2015 - ]
  9. REPEAT THE INSPECTION FROM STEP 1. 
    1. If the malfunction recurs, replace the power source control (power management control ECU).

      Refer to REMOVAL [07/2015 - ]

    2. Go to the next step.

      Result

      Proceed to
      NEXT

    Result:  1

    NEXT 

    See step  8

  10. REFER TO THE WIRING DIAGRAM AND VERIFY WHETHER OR NOT THERE IS A COMMON CONNECTOR BETWEEN THE FOLLOWING TERMINALS 
    • Power source control (power management control ECU) terminal E3-12 - Back-up light (LH) terminal E44-1
    • Power source control (power management control ECU) terminal E3-12 - Back-up light (RH) terminal E45-2

    If there is a common connector: 

    1. Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
    2. Repair or replace the malfunctioning part.

    If there is no common connector: 

    1. Repair or replace the wiring harness which has a short to ground.
    1. Go to the next step.

      Result

      Proceed to
      NEXT

    Result:  1

    NEXT 

    See step  7

  11. REPAIR OR REPLACE THE CONNECTOR. 
    1. Then go to the next step.

      Result

      Proceed to
      NEXT

    Result:  1

    NEXT 

    See step  7

  12. REPAIR OR REPLACE THE CONNECTOR. 
    1. Then go to the next step.

      Result

      Proceed to
      NEXT

    Result:  1

    NEXT 

    See step  7

  13. REPAIR OR REPLACE THE CONNECTOR. 
    1. Then go to the next step.

      Result

      Proceed to
      NEXT

    Result:  1

    NEXT 

    See step  7

  14. REPLACE THE BACK-UP LIGHT BULB (RH). 
    1. Refer to REPLACEMENT [07/2015 - ]
    2. Then go to the next step.

      Result

      Proceed to
      NEXT

    Result:  1

    NEXT 

    See step  7

  15. REPLACE THE BACK-UP LIGHT BULB (LH). 
    1. Refer to REPLACEMENT [07/2015 - ]
    2. Then go to the next step.

      Result

      Proceed to
      NEXT

    Result:  1

    NEXT 

    See step  7

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