Master Warning Light Malfunction

DESCRIPTION

If the steering control ECU detects that VGRS system has a malfunction, warning information is transmitted to the combination meter via CAN.

The combination meter will turn the master warning light on based on this information.

Warning information is transmitted via the following route:

Connecting terminals TC and CG of the DLC3 makes the master warning light blink and outputs DTCs.

WIRING DIAGRAM

INSPECTION PROCEDURE

Tech Tips

Check that there is no problem in CAN communication before performing the following procedure.

If there are any problems in these communications, first troubleshoot them and then proceed to the troubleshooting below.

PROCEDURE

CHECK AUXILIARY BATTERY

Measure the voltage according to the value(s) in the table below.

Standard voltage

Tester Connection	Condition	Specified Condition
Auxiliary battery terminal (+) - Auxiliary battery terminal (-)	Always	11 to 14 V

NG

RECHARGE OR REPLACE AUXILIARY BATTERY

OK

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (COMBINATION METER)

Select the Active Test, use the intelligent tester to generate a control command, and then check that the master warning light turns on/off.

Combination meter:
Tester Display	Test Part	Control Range	Diagnostic Note
Master Warning	Master warning light	OFF / ON	Confirm that the vehicle is stopped and power switch is turned ON (READY)

OK
Indicator light turns on / turns off.

NG

GO TO METER / GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

OK

CHECK DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)

Check for DTCs in the electronically controlled brake system Click here.

Result
Result	Proceed to
DTC is not output	OK
DTC is output	NG

NG

GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) Click here

OK

REPLACE STEERING CONTROL ECU Click here

VARIABLE GEAR RATIO STEERING SYSTEM Master Warning Light Malfunction