THEFT DETERRENT SYSTEM > DIAGNOSIS SYSTEM



DESCRIPTION

  1. The multiplex network body ECU controls the vehicle's theft deterrent system functions. Theft deterrent system data can be read through the data link connector 3 (DLC3) of the vehicle.
    When the system seems to be malfunctioning, use the intelligent tester to check for malfunctions and perform repairs.


CHECK DLC3
If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.
B105749E02
A103811E18

HINT:
The vehicle uses the ISO 15765-4 communication protocol. The terminal arrangement of the DLC3 complies with ISO 15031-03 and matches the ISO 15765-4 format.


Symbols (Terminal No.)
Terminal Description
Condition
Specified Condition
SIL (7) - SG (5)
Bus "+" line
During transmission
Pulse generation
CG (4) - Body ground
Chassis ground
Always
Below 1 Ω
SG (5) - Body ground
Signal ground
Always
Below 1 Ω
BAT (16) - Body ground
Battery positive
Always
10 to 14 V

HINT:
Connect the cable of the intelligent tester to the DLC3, turn the engine switch on (IG) and attempt to use the tester. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the tester.
If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle.
If communication is still not possible when the tester is connected to another vehicle, the problem may be in the tester itself. Consult the Service Department listed in the tester's instruction manual.


INSPECT BATTERY VOLTAGE

Standard voltage:
11 to 14 V

If the voltage is below 11 V, recharge or replace the battery before proceeding.