Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Power Source Mode does not Change to ON (ACC)

DESCRIPTION

If the engine switch is pressed with the electrical key transmitter sub-assembly in the cabin, the certification ECU (smart key ECU assembly) receives a signal and changes the power source mode.

HINT:

When the cable is disconnected and reconnected to the negative (-) battery terminal, the power source mode returns to the state it was in before the cable was disconnected.

WIRING DIAGRAM

Refer to Power Source Mode does not Change to ON (IG and ACC) (See page CAUTION / NOTICE / HINT ).

CAUTION / NOTICE / HINT

NOTICE:

  • When using the Techstream with the engine switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off an intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
  • The smart key system (for Start Function) uses a multiplex communication system (LIN communication system) and the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting.

    Click here Troubleshoot the smart key system (for Start Function) after confirming

    Troubleshoot the smart key system (for Start Function) after confirming that the communication systems are functioning properly.

  • Make sure that no DTCs are output. If any DTCs are output, proceed to the Diagnostic Trouble Code Chart (See page If the smart key system is disabled through the customize function, ).
  • If the smart key system is disabled through the customize function, enable the system before performing troubleshooting (See page Before replacing the certification ECU (smart key ECU assembly), refer ).
  • Before replacing the certification ECU (smart key ECU assembly), refer to the smart key system (for Start Function) precaution (See page Inspect the fuses of circuits related to this system before performing ).
  • Inspect the fuses of circuits related to this system before performing the following inspection procedure.
  • After completing repairs, confirm that the problem does not occur.
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
  • Power Supply Condition
  • ACC Relay Monitor
Starting Control
  • Ignition

-

PROCEDURE

1.

CHECK FOR DTC

(a) Using the Techstream, check for certification ECU (smart key ECU assembly) DTCs (See page Result ).

Result

Result

Proceed to

DTCs are not output

A

Smart key system (for Start Function) DTCs are output

B

B

GO TO DIAGNOSTIC TROUBLE CODE CHART

A

2.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - DRIVER SIDE JUNCTION BLOCK)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

INSPECT DRIVER SIDE JUNCTION BLOCK (ACC RELAY)

NG

REPLACE DRIVER SIDE JUNCTION BLOCK

OK

4.

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

OK

USE SIMULATION METHOD TO CHECK

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

Power Source Mode does not Change to ON (IG)
DESCRIPTION If the engine switch is pressed with the electrical key transmitter sub-assembly in the cabin, the certification ECU (smart key ECU assembly) receives a signal and changes the power s ...

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Other materials:

Check For Intermittent Problems
CHECK FOR INTERMITTENT PROBLEMS 1. CHECK FOR INTERMITTENT PROBLEMS HINT: A momentary interruption (open circuit) in the connectors and/or wire harnesses between the sensors and ECUs can be detected using the ECU Data List function of the Techstream. (a) Turn the ignition switch off. (b) Con ...

Dtc Check / Clear
DTC CHECK / CLEAR CHECK FOR DTC (a) Connect the Techstream to the DLC3. (b) Turn the ignition switch to ON. (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Central Gateway / Trouble Codes. (e) Read the DTCs. CLEAR DTC (a) Connect the Techstream to the DLC3. (b) ...

Data List / Active Test
DATA LIST / ACTIVE TEST 1. DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals ...

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