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).

 

www.vxdiagshop.com