Diagnosis System

CHECK DLC3
1. Check the DLC3. Refer to GENERAL INFORMATION .
FUNCTION OF POWER STEERING WARNING LIGHT
1. When a malfunction is detected in the power steering system, the power steering warning light on the combination meter comes on to inform the driver of the malfunction.
  
  Fig 1: Identifying Power Steering Warning Light
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  HINT:
  
  When power assist is stopped or reduced, the power steering warning light comes on.
  
  Power assist is stopped:
  - When a malfunction occurs in the power steering system (including when CAN communication is lost, etc.).
  - When the engine stalls (not a malfunction).
  - During the period from the time the ignition switch is turned to ON until the engine is started (not a malfunction).
  Power assist is reduced:
  - When a malfunction occurs in the power steering system (including when CAN communication is lost, etc.).
  - When the battery voltage decreases (not a malfunction).
CHECK POWER STEERING WARNING LIGHT
1. Check that the power steering warning light comes on when the ignition switch is turned to ON.
2. Check that the power steering warning light turns off when the engine starts.
3. If the warning light remains on, refer to Power Steering Warning Light Circuit .