Diagnosis System [09/2014 - 10/2015]
WARNING: This page is about a different car, the 2020 Lexus GS 350, 2019 Lexus GS 350, and 2018 Lexus GS 350. However, it is still accessible from the selected car via links, so may be relevant.
- DIAGNOSIS SYSTEM
- Inspect the battery voltage.
Standard Voltage
11 to 14 V
If the voltage is below 11 V, recharge the battery before proceeding.
- Check the DLC3 (Refer to GENERAL INFORMATION [09/2014 - ] ).
- Inspect the battery voltage.
- FUNCTION OF AWD WARNING
- If a malfunction occurs during system operation, "AWD System check" will be displayed on the multi-information display to inform the driver of the system malfunction.
HINT:
The master warning light turns on at the same time.
- If a malfunction occurs during system operation, "AWD System check" will be displayed on the multi-information display to inform the driver of the system malfunction.
- CHECK MASTER WARNING LIGHT
- Turn the engine switch on (IG), and check that the master warning light comes on for approximately 3 seconds.
HINT:
The master warning light goes off while the system is in the DTC output mode.
- Turn the engine switch on (IG), and check that the master warning light comes on for approximately 3 seconds.
- CHECK AWD WARNING
- Using SST, connect terminals TC and CG of the DLC3 (to be in the DTC output mode).
- SST: 09843-18040
TEXT IN ILLUSTRATION*a Front view of DLC3 - Turn the engine switch on (IG).
- "DIAG AWD" is displayed on the multi-information display, and the 4WD ECU assembly checks the system for malfunctions.
- If the 4WD control system is normal, "DIAG AWD FF" will be displayed on the multi-information display.
- If the 4WD control system is not normal, "DIAG AWD XX(DTC)" will be displayed on the multi-information display.
- Although the Test Mode is not set for the 4WD control system, a message will be displayed on the multi-information display when the Test Mode is activated for checking the VSC, etc.
HINT:
- Test Mode DTCs will not be stored because the Test Mode is not set.
- On the multi-information display, AWD, VGRS and ARS are displayed in order.
- If the systems above are not displayed on the multi-information display, there may be a malfunction in "TC and CG Terminal Circuit" (Refer to TC and CG Terminal Circuit [09/2014 - 10/2015] ).
- If the AWD warning check result is not normal, proceed to troubleshooting for the AWD warning light circuit.
Trouble Area See procedure AWD warning (Remains on) Refer to AWD Warning Light Remains ON [09/2014 - 10/2015] AWD warning (Does not come on) Refer to AWD Warning Light does not Come ON [09/2014 - ]
- Using SST, connect terminals TC and CG of the DLC3 (to be in the DTC output mode).
- FAIL-SAFE FUNCTION
- If the following malfunctions occur, the 4WD ECU assembly will stop the function of the 4WD control system or partly change the function to control the system.
Malfunction Control Malfunction in a speed sensor System function is stopped Malfunction in the steering sensor and throttle signal line System function is partially changed
- If the following malfunctions occur, the 4WD ECU assembly will stop the function of the 4WD control system or partly change the function to control the system.