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
.gif)
).
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 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,
enable the system before performing troubleshooting (See page
).
- 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 the following inspection procedure.
- After completing repairs, confirm that the problem does not occur.
|
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
Starting Control
|
- |
PROCEDURE
|
1. |
CHECK FOR DTC |
(a) Using the Techstream, check for certification ECU (smart key ECU assembly)
DTCs (See page ).
|
Result |
Proceed to |
|---|---|
|
DTCs are not output |
A |
|
Smart key system (for Start Function) DTCs are output |
B |
| B | .gif) |
GO TO DIAGNOSTIC TROUBLE CODE CHART |
|
.gif)
|
2. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - DRIVER SIDE JUNCTION BLOCK) |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. |
INSPECT DRIVER SIDE JUNCTION BLOCK (ACC RELAY) |
| NG | |
REPLACE DRIVER SIDE JUNCTION BLOCK |
|
|
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 ...
Starter
...
Other materials:
Precaution
PRECAUTION
1. IGNITION SWITCH EXPRESSIONS
(a) The type of ignition switch used on this model differs according to the specifications
of the vehicle. The expressions listed in the table below are used in this section.
Expression
Ignition Switch (Position)
Engine ...
Inspection
INSPECTION
PROCEDURE
1. INSPECT CENTER STOP LIGHT ASSEMBLY (for LED Type Stop Light)
(a) Check the illuminates.
(1) Apply battery voltage to the connector and check the light illumination
condition.
Text in Illustration
*a
Component without ...
Reassembly
REASSEMBLY
PROCEDURE
1. INSTALL REAR BUMPER SIDE STAY LH
(a) Install the rear bumper side stay LH with the 2 bolts.
Torque:
30 N·m {306 kgf·cm, 22 ft·lbf}
2. INSTALL REAR BUMPER SIDE STAY RH
HINT:
Use the same procedure as for ...