Entry And Start System - Diagnosis System

Lexus IS250 IS220d GSE20 ALE20 4GR-FSE STARTING


ENTRY AND START SYSTEM - DIAGNOSIS SYSTEM

DESCRIPTION

Push-button start function data and the Diagnostic Trouble Codes (DTCs) can be read through the Data Link Connector 3 (DLC3) of the vehicle. When the function 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.

Entry And Start System - Diagnosis System. 4GR-FSE STARTING. Lexus IS250 IS220d GSE20 ALE20
  • HINT:
  • The vehicle uses 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 DescriptionConditionSpecified Condition
CG (4) - Body groundChassis groundAlwaysBelow 1 Ω
SG (5) - Body groundSignal groundAlwaysBelow 1 Ω
SIL (7) - SG (5)Bus "+" lineDuring transmissionPulse generation
BAT (16) - Body groundBattery positiveAlways10 to 14 V
CONNECT INTELLIGENT TESTER
Entry And Start System - Diagnosis System. 4GR-FSE STARTING. Lexus IS250 IS220d GSE20 ALE20
  • 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

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

  • Standard voltage:
  • 11 to 14 V