Inspection Procedure

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.

PERFORM PRE-CHECK
1. Check that all of the following conditions for not illuminating the brake warning light are satisfied.
  1. The ABS warning light is off.
  2. The amount of the brake fluid is between the min. line and max. line of the brake master cylinder reservoir.
  3. The parking brake pedal is fully released.
NOTE: When releasing the parking brake, move the shift lever into the P position to hold the vehicle for safety.

NEXT: Go to next step.
CHECK DTC FOR ABS
1. Check if the DTCs are recorded, (see PRE-CHECK )
  NO: Go to step 3
  
  YES: REPAIR CIRCUIT INDICATED BY OUTPUT CODE
INSPECT BRAKE WARNING LIGHT
WHEN USING HAND-HELD TESTER:
1. Connect the hand-held tester to the DLC3.
2. Start the engine.
3. Select the item "BRAKE WARN LIGHT" in the ACTIVE TEST and operate the BRAKE warning light on the hand-held tester display.
  
  Fig 1: Brake Warning Light Condition Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Check that "ON" and "OFF" of the BRAKE warning light are shown on the combination meter with the hand-held tester.
Standard:
1. Turn the BRAKE warning light is turned ON or OFF in accordance with the hand-held tester.
WHEN NOT USING HAND-HELD TESTER:
1. Turn the ignition switch off and disconnect the connector S1 from the skid control ECU.
  
  Fig 2: Turning Ignition Switch Off & Disconnecting Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Ground terminal BRL of the skid control ECU.
3. Turn the ignition switch to the ON position.
4. Check that the brake warning light goes off.
OK: Go to step 8

NG: Go to next step.
INSPECT PARKING BRAKE SWITCH ASSY
1. Remove the parking brake switch.
  
  Fig 3: Removing Parking Brake Switch
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in Fig 4 .
  Standard
  
  Fig 4: Measuring Resistance Between Parking Brake Specifications Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR PARKING BRAKE SWITCH ASSY

OK: Go to next step.
CHECK HARNESS OR CONNECTOR (SKID CONTROL ECU - PARKING BRAKE SWITCH)
1. Disconnect the skid control ECU connector S1 and the parking brake switch connector P5.
  
  Fig 5: Disconnecting Skid Control ECU Connector & Parking Brake Switch
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in Fig 6 .
  Standard
  
  Fig 6: Measuring Resistance Between Parking Brake Specifications Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance according to the value(s) in Fig 7 .
  Standard
  
  Fig 7: Measuring Resistance Between Parking Brake & Body Ground Specifications Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step.
INSPECT BRAKE FLUID LEVEL WARNING SWITCH
1. Remove the reservoir tank cap and strainer.
2. Disconnect the brake fluid level warning switch connector B1.
  
  Fig 8: Disconnecting Brake Fluid Level Warning Switch Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance according to the value(s) in Fig 9 .
  Standard
  
  Fig 9: Measuring Resistance Between Brake Fluid Lever Warning Switch Specifications Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPLACE BRAKE FLUID LEVEL WARNING SWITCH

OK: Go to next step.
CHECK HARNESS AND CONNECTOR (BRAKE FLUID LEVEL WARNING SWITCH - COMBINATION METER)
1. Disconnect the combination meter connector C7 and the brake fluid level warning switch connector B1.
  
  Fig 10: Disconnecting Combination Meter Connector & Brake Fluid Level Warning Switch Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in Fig 11 .
  Standard
  
  Fig 11: Measuring Resistance Between Brake Fluid Level Warning Switch & Combination Meter Specifications Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance according to the value(s) in Fig 12 .
  Standard
  
  Fig 12: Measuring Resistance Between Combination Meter & Body Ground Specifications Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step.
CHECK HARNESS AND CONNECTOR
1. Disconnect the skid control ECU connector S1 and combination meter connector C8.
  
  Fig 13: Disconnecting Skid Control ECU & Combination Meter Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in Fig 14 .
  Standard
  
  Fig 14: Measuring Resistance Between BRL & Combination Meter Specifications Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance according to the value(s) in Fig 15 .
  Standard
  
  Fig 15: Measuring Resistance Between BRL & Body Ground Specifications Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step.
CHECK COMBINATION METER ASSY (SEE COMBINATION METER )
NG: REPAIR OR REPLACE COMBINATION METER ASSY

OK: REPLACE BRAKE ACTUATOR ASSY (SEE REPLACEMENT )

NOTE: When replacing the Brake Actuator assy, perform zero point calibration (see PRE-CHECK ).