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GSIC - Global Service Information Center

DTC    B2090    Driving Support System Malfunction

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DESCRIPTION

The seat belt control ECU receives collision information from the driving support ECU and brake booster with master cylinder (skid control ECU) via CAN communication, and tightens the seat belt by operating the motor inside the front seat outer belt.
When the driving support ECU detects a malfunction in the dynamic radar cruise control system and pre-crash safety system, the malfunction information is sent to the seat belt control ECU, which outputs this DTC.
When DTC B2090 is detected, other DTCs are also stored by the driving support ECU (dynamic radar cruise control system and pre-crash safety system).

DTC No.
DTC Detection Condition
Trouble Area
B2090
While initial check is running, the power switch is on (IG) and the pre-crash safety system is operating, a malfunction is detected in the driving support system for 1 second.
  1. Driving support ECU
  2. Seat belt control ECU

INSPECTION PROCEDURE

HINT:
When clearing the DTCs, first clear the DTC output from the driving support ECU (Pre-Crash 2), and then clear the DTC output from the seat belt control ECU.

1.CHECK DTC OUTPUT (DYNAMIC RADAR CRUISE CONTROL SYSTEM)

  1. Check DTCs for dynamic radar cruise control system (Click here).

    OK:
    Dynamic radar cruise control system DTCs are not output.



NG
GO TO DYNAMIC RADAR CRUISE CONTROL SYSTEM (Click here)
OK


2.CHECK DTC OUTPUT (DRIVING SUPPORT ECU (PRE-CRASH 2))

  1. Using the intelligent tester, enter the following menus: Body / Pre-Crash 2 / DTC.

  1. Check for DTCs (Click here).

    OK:
    "Pre-Crash 2" DTC is not output.



NG
GO TO DIAGNOSTIC TROUBLE CODE CHART (Click here)
OK


3.CHECK DTC OUTPUT (PRE-CRASH SAFETY SYSTEM)

  1. Using the intelligent tester, enter the following menus: Body / Pre-Crash / DTC.

  1. Clear the DTCs (Click here).

  1. Recheck for DTCs.

    OK:
    DTC B2090 is not output.



NG
REPLACE SEAT BELT CONTROL ECU (Click here)
OK

CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (Click here)