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Diagnosis System

  1. CHECK DLC3 
    1. Check the DLC3 (See HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS ).
  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.
      Fig 1: Multi-Information Screen Display
      G05754807Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      DTC CHART

      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 NOT AVAILABLE NOW This message appears when the seat belt control ECU is in the fail-safe mode (See DTC CHECK / CLEAR  ) - Blinking
    2. Initial check
      1. The initial check occurs when the engine 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 NOT AVAILABLE NOW".
        Fig 2: Multi-Information Screen Display
        G05754808Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Constant check
      1. The seat belt control ECU and distance control ECU constantly monitor the pre-collision system for malfunctions after the initial check approximately 3 seconds after turning the engine switch on (IG).
      2. "CHECK PCS SYSTEM" or "PCS NOT AVAILABLE NOW" 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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