ENTRY AND START SYSTEM (for Start Function) > Power Source Mode does not Change to ON (ACC)

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DESCRIPTION

When the key is in the vehicle and the power switch is pressed, the power management control ECU receives a signal and changes the power source mode.
Use this troubleshooting procedure when the power source mode does not change to on (ACC) but does change to on (IG).

HINT:
  1. When the power management control ECU is replaced with a new one and the cable is connected to the negative (-) auxiliary battery terminal, the power source mode changes to on (IG).
  2. When the auxiliary battery cable is disconnected and reconnected, the power source returns to the mode it was in before the auxiliary battery cable was disconnected.


WIRING DIAGRAM

Refer to DTC B2274 (Click here).

INSPECTION PROCEDURE

NOTICE:
  1. When using the intelligent tester with the power switch off, perform either of the following: 1) Turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the intelligent tester and vehicle begins, or 2) connect the intelligent tester to the vehicle, select the vehicle type under manual mode, and then enter the following menus:
    for Power Source Control: Body / Power Source Control / DTC.
    for Entry&Start: Body / Entry&Start / DTC.
  2. Make sure that no DTCs are output. If any DTCs are output, proceed to the Diagnostic Trouble Code Chart (Click here).
  3. The entry and start system uses multiplex communication. First perform the inspections in "How to Proceed with Troubleshooting" to confirm that there are no communication malfunctions before proceeding with troubleshooting (Click here).
  4. If the entry and start system is disabled through the customize function, enable the system before performing troubleshooting (Click here).
  5. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  6. After completing repairs, confirm that the problem does not occur.


HINT:

Related Data List and Active Test Items 
Problem Symptom
Data List Item
Active Test Item
Power source mode does not change to on (ACC) but does change to on (IG)
Power Source Control
  1. Power Supply Condition
  2. ACC Relay Monitor
-

1.CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - POWER MANAGEMENT CONTROL ECU)

  1. Disconnect the H3 and H4 connectors from the power management control ECU.

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    H3-1 (AM22) - Body ground
    		Always
    		9.5 to 16 V
    H4-7 (AM21) - Body ground
    		Always
    		9.5 to 16 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND)

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

    Standard Resistance:
    Tester Connection
    		Condition
    		 Specified Condition
    H3-5 (E01) - Body ground
    		Always
    		Below 1 Ω
    H3-6 (E1) - Body ground
    		Always
    		Below 1 Ω
    H4-4 (E12) - Body ground
    		Always
    		Below 1 Ω
    H4-5 (E02) - Body ground
    		Always
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    B231373E15

  1. Remove the instrument panel junction block assembly (Click here).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    2A-43 - 2B-4
    		20°C (68°F)
    		81.49 to 118.98 Ω
    2A-43 - 2B-6
    		20°C (68°F)
    		81.49 to 118.98 Ω
    2B-4 - 2B-6
    		Always
    		Below 1 Ω

    Text in Illustration 
    *a
    		Component without harness connected
    (Instrument Panel Junction Block Assembly)



NG
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (Click here)
OK


4.CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - INSTRUMENT PANEL J/B)

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H4-1 (ACCD) - 2A-43
    		Always
    		Below 1 Ω
    H4-1 (ACCD) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BODY GROUND)

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    2B-4 - Body ground
    		Always
    		Below 1 Ω
    2B-6 - Body ground
    		Always
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.INSPECT POWER MANAGEMENT CONTROL ECU


    B229525E11

  1. Install the instrument panel junction block assembly (Click here).

  1. Reconnect the H3 and H4 connectors.

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    H4-1 (ACCD) - Body ground
    		Power switch on (ACC)
    		Output voltage at terminal AM21 or AM22 is -2.5 V or more

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



NG
REPLACE POWER MANAGEMENT CONTROL ECU (Click here)
OK

USE SIMULATION METHOD TO CHECK (Click here)