Master Warning Light Malfunction

STEERING COLUMN: VARIABLE GEAR RATIO STEERING SYSTEM: Master Warning Light Malfunction
- 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 and BEAN.

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

Warning information is transmitted via the following route:

* 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







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.

PROCEDURE

1. CHECK BATTERY

(a) Measure the battery voltage.

OK:

11 to 14 V

NG -- REPLACE BATTERY
OK -- Continue to next step.

2. PERFORM ACTIVE TEST BY TECHSTREAM (COMBINATION METER)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Perform the Active Test. Enter the following menus: Body Electrical / Combination Meter / Active Test.

Combination Meter





NG -- CHECK AND REPLACE COMBINATION METER
OK -- Continue to next step.

3. CHECK POWER STEERING SYSTEM

(a) Check for DTCs in the power steering system Power Steering System.

OK:

DTC is not output.

NG -- GO TO POWER STEERING SYSTEM
OK -- Continue to next step.

4. CHECK WIRE HARNESS

(a) 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