Inspection Procedure
WARNING: This page is about a different car, the 2003 Lexus GS 430, 2003 Lexus GS 300, 2002 Lexus GS 430, and 2002 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
For circuit wiring diagram, see Fig 1.
NOTE:
If using the hand-held tester, start the inspection from step 1 and if not using the hand-held tester, start from step 2.
- Check the brake fluid level warning switch using the hand-held tester. Connect the hand-held tester to DLC3. See Figure. Check the brake fluid level warning switch using DATA LIST. See BRAKE FLUID LEVEL WARNING SWITCH DATA LIST table. If the results are OK, inspect the instrument cluster. See INSTRUMENT PANEL
article. If the results are not OK, go to the next step.BRAKE FLUID LEVEL WARNING SWITCH DATA LIST
Brake Fluid Level Switch Normal OFF Abnormal ON - Check the brake fluid level warning switch. See BRAKE FLUID LEVEL WARNING SWITCH article under COMPONENT TESTS in INSTRUMENT PANEL article. If the results are OK, go to the next step. If the results are not OK, replace the brake fluid warning switch.
- Check for short to power, short to ground and continuity in the wiring harness and connector between the brake fluid level warning switch and body ECU No. 2. If the results are OK, inspect the instrument cluster and replace as necessary. See INSTRUMENT PANEL article. If the results are not OK, repair or replace the wiring harness or connector.