Variable Gear Ratio Steering System Master Warning Light Malfunction
Steering. Lexus Gs430, Gs300. Uzs190 Grs190
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK BATTERY
CHECK COMBINATION METER
CHECK POWER STEERING SYSTEM
CHECK WIRE HARNESS
VARIABLE GEAR RATIO STEERING SYSTEM - 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
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.
Measure the battery voltage.
- OK:
- 11 to 14 V
| 2.CHECK COMBINATION METER |
Turn the engine switch off.
Disconnect the connector from the combination meter.
Turn the engine switch on (IG).
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
|
| | CHECK COMBINATION METER SYSTEM |
|
|
| 3.CHECK POWER STEERING SYSTEM |
Check for DTCs in the power steering system (Click here).
- OK:
- DTC is not output.
| | GO TO POWER STEERING SYSTEM |
|
|
Check for an open or short circuit in the wire harnesses (CANH and CANL) of the ECM.
- OK:
- The wire harnesses are normal.
| | REPAIR OR REPLACE WIRE HARNESS |
|
|
| OK |
|
|
|
| REPLACE STEERING CONTROL ECU |
|
