Diagnosis System

DOOR LOCK: SMART KEY SYSTEM: DIAGNOSIS SYSTEM

1. DESCRIPTION

(a) The certification ECU controls the function of the smart key system on the vehicle. Data of the smart key system and the Diagnostic Trouble Code (DTC) can be read in the Data Link Connector 3 (DLC3) of the vehicle. When a malfunction occurs in the smart key system, even though the smart key system warning light does not turn on, DTCs can be checked.

When the system seems to be malfunctioning, use Techstream to check for a malfunction and perform repairs.

2. CHECK DLC3

(a) The vehicle's ECU uses ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.









NOTICE:
*: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the engine switch, any other switches or the doors.

If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.

(b) Connect the cable of Techstream to the DLC3, turn the engine switch on (IG) and attempt to use Techstream. If the screen displays a communication error message, a problem exists in the vehicle side or tester side.

HINT
* If communication is normal when the tool is connected to another vehicle, inspect the DLC3 on the original vehicle.
* If communication is still impossible when the tool is connected to another vehicle, the problem is probably in the tool itself. Consult the Service Department listed in the tool's instruction manual.