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. Related Data List and Active Test Items |
Problem Symptom | Data List and Active Test | |
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
| WIRING DIAGRAM
 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 at intervals of 1.5 seconds or less to maintain communication
between the Techstream and the vehicle.
- The smart key system (for Start Function, Gasoline Model) uses the LIN
communication system and CAN communication system. Inspect the
communication function by following How to Proceed with Troubleshooting.
Troubleshoot the smart key system (for Start Function, Gasoline Model)
after confirming that the communication systems are functioning
properly.
Click here 
- Make sure that no DTCs are output. If any DTCs are output, proceed to Diagnostic Trouble Code Chart.
- If the smart key system (for Start Function, Gasoline Model) has been
disabled, enable the system before performing troubleshooting.
Click here
- Inspect the fuses for circuits related to this system before performing the following procedure.
- Before replacing the certification ECU (smart key ECU assembly), refer to Registration.
Click here
- After completing repairs, confirm that the problem does not recur.
- After performing repairs, confirm that no DTCs are output by performing "DTC Output Confirmation Operation."
PROCEDURE (a) Using the Techstream, check for certification ECU (smart key ECU assembly) DTCs.
Body Electrical > Power Source Control > Trouble Codes Body
Electrical > Smart Key > Trouble Codes Body Electrical >
Starting Control > Trouble Codes |
Result | Proceed to | |
DTCs are not output | A | |
Smart key system (for Start Function, Gasoline Model) DTCs are output |
B |
| B |
 | GO TO DIAGNOSTIC TROUBLE CODE CHART |
|
A |
 | |
| 2. |
CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
| (a) Connect the G40 certification ECU (smart key ECU assembly) connector. |
 |
|
*a | Component with harness connected (Certification ECU (Smart Key ECU Assembly)) | | |
(b) Measure the voltage according to the value(s) in the table below. Standard Voltage: |
Tester Connection | Condition |
Specified Condition | |
G40-16 (ACCD) - Body ground |
Engine switch on (ACC) → Engine switch on (IG) |
1 V or less → 9 V or higher |
| NG |
| REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
|
OK | |
| |
| 3. |
CHECK
HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) -
INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY, BATTERY AND BODY GROUND) |
(a) Disconnect the G40 certification ECU (smart key ECU assembly) connector.
(b) Disconnect the 4A, 4D and 4K instrument panel junction block assembly connectors.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
G40-16 (ACCD) - 4A-30 |
Always | Below 1 Ω | |
4D-3 - Body ground | Always |
Below 1 Ω | |
G40-16 (ACCD) or 4A-30 - Other terminals and body ground |
Always | 10 kΩ or higher |
(d) Measure the voltage according to the value(s) in the table below. Standard Voltage: |
Tester Connection | Condition |
Specified Condition | |
4K-1 - Body ground | Always |
11 to 14 V |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
OK | |
| |
| 4. |
CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (ACC RELAY) |
(a) Remove the instrument panel junction block assembly. Click here
(b) Connect all of the instrument panel junction block assembly connectors.
(c) Measure the voltage according to the value(s) in the table below.
|
*a | Component without harness connected
(Instrument Panel Junction Block Assembly) |
- | - |
Standard Voltage: |
Tester Connection | Condition |
Specified Condition | |
4H-26 - Body ground | Engine switch on (IG) |
11 to 14 V |
| OK |
| USE SIMULATION METHOD TO CHECK |
| NG |
| REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY | |
