Diagnosis System

CHECK DLC3
1. Check the DLC3 (See HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS ).

FUNCTION OF WARNING INDICATOR AND MESSAGE

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

Courtesy 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

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
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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