VARIABLE GEAR RATIO STEERING SYSTEM > Master Warning Light Malfunction

for Preparation Click here


DESCRIPTION

If the steering control ECU detects that VGRS system has a malfunction, warning information is transmitted to the combination meter via CAN and BEAN.
The combination meter will turn the master warning light on based on this information.
Warning information is transmitted via the following route:
  1. Steering control ECU → (CAN) → Power steering ECU → (CAN) → Gateway ECU → (BEAN) → Combination meter
Connecting terminals TC and CG of the DLC3 makes the master warning light blink and outputs DTCs.

WIRING DIAGRAM


C111970E01


INSPECTION PROCEDURE

HINT:
Check that there is no problem in CAN and BEAN communications before performing the following procedure.
If there is any problem in these communications, first troubleshoot it and then proceed.

1.CHECK BATTERY

  1. Measure the battery voltage.

    OK:
    11 to 14 V



NG
REPLACE BATTERY
OK


2.CHECK COMBINATION METER


    C109571E06

  1. Turn the engine switch off.

  1. Disconnect the connector from the combination meter.

  1. Turn the engine switch on (IG).

  1. Check the master warning light operation according to the condition in the table below.

    Result:
    Tester connection
    		Condition
    		Master warning light
    L31-22 - Body ground
    		Engine switch on (IG)
    		ON



NG
CHECK COMBINATION METER SYSTEM
OK


3.CHECK POWER STEERING SYSTEM

  1. Check for DTCs in the power steering system (Click here).

    OK:
    DTC is not output.



NG
GO TO POWER STEERING SYSTEM
OK


4.CHECK WIRE HARNESS

  1. Check for an open or short circuit in the wire harnesses (CANH and CANL) of the ECM.

    OK:
    The wire harnesses are normal.



NG
REPAIR OR REPLACE WIRE HARNESS
OK

REPLACE STEERING CONTROL ECU