DESCRIPTION
- The certification ECU (smart key ECU assembly) blinks the security
indicator light (radio and display receiver assembly) when the
immobiliser is set (engine switch off).
- The certification ECU (smart key ECU assembly) receives the security
indicator light signal from the main body ECU (multiplex network body
ECU) via CAN communication when the theft deterrent system is in the
arming preparation state or alarm sounding state. Then, the
certification ECU (smart key ECU assembly) blinks the security indicator
light (radio and display receiver assembly).
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 
- Before replacing the certification ECU (smart key ECU assembly) or main
body ECU (multiplex network body ECU), refer to Registration.
Click here
PROCEDURE (a) Check for DTCs. Body Electrical > Smart Key > Trouble Codes Powertrain > Engine > Trouble Codes
OK: DTCs are not output.
| NG |  |
GO TO DIAGNOSTIC TROUBLE CODE CHART |
|
OK |
 | |
| 2. |
PERFORM ACTIVE TEST USING TECHSTREAM (IMMOBILISER INDICATOR) |
(a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG).
(c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Smart Key / Active Test.
(e) Perform the Active Test according to the display on the Techstream. Body Electrical > Smart Key > Active Test
|
Tester Display | Measurement Item |
Control Range | Diagnostic Note | |
Immobiliser Indicator | Security indicator light |
OFF/ON | - | Body Electrical > Smart Key > Active Test
|
Tester Display | | Immobiliser Indicator |
OK: The security indicator light (radio and display receiver assembly) operates normally.
| NG |
| GO TO STEP 4 |
|
OK | |
| |
| 3. |
CHECK SECURITY INDICATOR LIGHT (RADIO AND DISPLAY RECEIVER ASSEMBLY) OPERATION |
(a) When the immobiliser is set, check that the security indicator light (radio and display receiver assembly) blinks.*1
OK: The security indicator light (radio and display receiver assembly) blinks normally.
(b)
When the theft deterrent system is in the arming preparation state,
check that the security indicator light (radio and display receiver
assembly) illuminates.*2 OK: The security indicator light (radio and display receiver assembly) illuminates normally.
|
Result | Proceed to | |
*1 is NG (*2 is OK) | A | |
*2 is NG (*1 is OK) | B |
| A |
| REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
| B |
| REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| 4. |
CHECK
HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) -
SECURITY INDICATOR LIGHT (RADIO AND DISPLAY RECEIVER ASSEMBLY) AND BODY
GROUND) | (a) Disconnect the G40 certification ECU (smart key ECU assembly) connector.
(b) Disconnect the G20 security indicator light (radio and display receiver assembly) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
G40-20 (IND) - G20-16 (LP) |
Always | Below 1 Ω | |
G40-20 (IND) or G20-16 (LP) - Other terminals and body ground |
Always | 10 kΩ or higher | |
G20-6 (GND) - Body ground |
Always | Below 1 Ω |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
OK | |
| |
| 5. |
CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
(a) Connect the G40 certification ECU (smart key ECU assembly) connector.
(b) Connect the G20 security indicator light (radio and display receiver assembly) connector.
(c) Using an oscilloscope, check the waveform.
|
*a | Component with harness connected
(Certification ECU (Smart Key ECU Assembly)) |
- | - |
Measurement Condition: |
Tester Connection | Condition |
Specified Condition | |
G40-20 (IND) - Body ground |
Engine switch off → on (IG) |
Pulse generation → Below 2 V |
| OK |
| REPLACE SECURITY INDICATOR LIGHT (RADIO AND DISPLAY RECEIVER ASSEMBLY) |
| NG |
| REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) | | 
