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Home >> Toyota >> 2012 >> Prius Four >> Repair and Diagnosis (Single Page) >> Restraints >> Restraints Control Systems >> Pre-Collision System (Except Plug-In) (Diagnostics - Introduction) >> Pre-Collision System >> Diagnosis System >> Diagnosis System
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Diagnosis System

  1. CHECK DLC3 
    1. Check the DLC3. Refer to GENERAL INFORMATION .
  2. FUNCTION OF WARNING INDICATOR AND MESSAGE 
    1. If the pre-collision system is not functioning properly, the driver is warned by the master warning indicator and multi-information display warning message on the combination meter.
      Master Warning Indicator Warning Message Detail DTC PCS Warning Indicator
      ON CHECK PCS SYSTEM This message appears when the seat belt control ECU detects a system malfunction ◦ ON
      OFF PCS TEMPORARILY NOT AVAILABLE This message appears when the seat belt control ECU is in fail-safe mode. Refer to FAIL-SAFE CHART  - Blinking
    2. Initial check
      1. The initial check occurs when the power switch is off for more than 2 seconds, and then turned on (IG). The initial check consists of a pre-collision system diagnostic check with a duration of approximately 3 seconds.
      2. If a malfunction is detected during the initial check, the multi-information display will output "CHECK PCS SYSTEM " or "PCS TEMPORARILY NOT AVAILABLE".
    3. Constant check
      1. The seat belt control ECU and driving support ECU constantly monitor the pre-collision system for malfunctions after the power switch is turned on (IG) and initial check (approximately 3 seconds) completed.
      2. "CHECK PCS SYSTEM" or "PCS TEMPORARILY NOT AVAILABLE" is displayed on the multi-information display in the combination meter assembly when the constant check detects malfunctions in the pre-collision system.
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