Pre-Crash Safety System Initialization

Restraints. Lexus Is250, Is220D. Gse20 Ale20
Pre-Crash Safety. Lexus Is250, Is220D. Gse20 Ale20

  1. Precautions for Seat Belt Control ECU Replacement

Pre-Crash Safety System -- Initialization



Precautions for Seat Belt Control ECU Replacement
The seat belt control ECU operates the pre-crash safety system based on the stored data that informs that the vehicle is LHD or RHD model. LHD or RHD refers to the seating position of the driver, not which side of the road the vehicle is driven on.
Therefore, when replacing the seat belt control ECU, it is necessary to store the information about whether the vehicle is a LHD or RHD model. This can be performed by following these steps:

  1. Turn the engine switch on (IG).

  2. The PCS warning light comes on for at least 30 seconds after turning the engine switch on (IG). Make sure that the warning light does not remain on.

  3. At this time, the seat belt control ECU receives vehicle configuration (LHD/RHD) information from the gateway ECU and stores it in memory.

    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Following the display on the tester, select the "Active Test".

      Seat Belt Control ECU:
      Item
      		Vehicle Condition/Test Details
      		Diagnostic Note
      D Belt Motor
      		Driver's seat belt motor/
      ON: Seat belt motor operates
      OFF: Seat belt motor does not operate
      		Seat belt (driver side) is fastened
      P Belt Motor
      		Passenger's seat belt motor/
      ON: Seat belt motor operates
      OFF: Seat belt motor does not operate
      		Seat belt (passenger side) is fastened