Disable Lexus GS400 ABS Light by VXDIAG Techstream
Here we post the troubleshooting steps below for the ABS Light always on condition as they are in the manual.
You will need a vxdiag vcx nano Toyota cable with Techstream software. You can also rent Techstream for like $10/day from Toyota, after you get the OBDII VCX to USB/WiFi device.
DI-459 (page): ABS Warning Light Circuit
1. LEXUS hand-held
tester: Check if the ABS “ON” and “OFF” are shown on the tester. OK: Check and
replace ABS & BA & TRAC & VSC ECU. [Techstream will check the ECU’s,
and report out their condition]
2. Repair the bulb or combination meter assembly
3. Check ABS solenoid relay: Shows pin-outs and continuity checks
4. Check the ECU connectors are securely connected to ECU
5. Check operation of the ABS warning light (See Step 1) [redundant check]
6. Is DTC output? Yes -> repair circuit indicated by the output code
7. Does ABS warning light go off if short pin is removed?
No: Check for
short circuit in harness and connector between warning light and DLC1 and ECU
(see page IN-31).
Yes: then proceed to 8
Page IN-31: Several pages
describing standard troubleshooting techniques for connectors and ECU’s
8. Check ABS solenoid relay (See step 3). Bad: replace relay
Good: Check
for short circuit in harness and connector between warning light and DLC1 and
ECU (see page IN-31).
