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Home >> Scion >> 2013 >> iQ Base >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 84 (Smart Key System (Start Function) (Diagnostic Codes & Symptom Tests) (Electric)) >> SMART KEY SYSTEM (for Start Function) >> DTC B2274: ACC Monitor Malfunction >> Procedure

DTC B2274: ACC Monitor Malfunction: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK HARNESS AND CONNECTOR (POWER SOURCE) See step   1 

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR IN CIRCUIT CONNECTED TO POWER SOURCE 

    OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (GROUND) See step   2 

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 
    1. Disconnect the C21 power management control ECU connector.
    2. Disconnect the 3D and 3C instrument panel junction block assembly connectors.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C21-16 (ACCD) - 3D-27 Always Below 1 Ω
      3C-10 - Body ground Always Below 1 Ω
      C21-16 (ACCD) or 3D-27 - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (ACC RELAY) 
    1. Remove the instrument panel junction block assembly. Refer to REMOVAL .
      Fig 1: Identifying Instrument Panel Junction Block Assembly Connector Terminals
      GTY389918Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (Instrument Panel Junction Block Assembly)      		 - -
    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly. Refer to REMOVAL .
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      3A-1 - MB-29 Auxiliary battery voltage not applied to terminals 3D-27 and 3C-10 10 kΩ or higher
      Auxiliary battery voltage applied to terminals 3D-27 and 3C-10 Below 1 Ω

    NG → See step   8 

    OK: Go to next step 

  5. INSPECT POWER MANAGEMENT CONTROL ECU 
    Fig 2: Measuring Voltage Of Power Management Control ECU Connectors
    GTY391475Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Reconnect the power management control ECU connectors.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      C21-16 (ACCD) - Body ground Power switch off → Power switch on (ACC) 1 V or less → 8.5 V or higher
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (Power Management Control ECU)

    NG → See step   6 

    OK → See step   7 

  6. REPLACE POWER MANAGEMENT CONTROL ECU. Refer to  REMOVAL 
  7. USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING 
  8. REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL 
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