Parking Brake Switch Circuit: Wiring Diagram
WARNING: This page is about a different car, the 2006 Lexus IS 350 and 2006 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK BRAKE WARNING LIGHT
- Check that the brake warning light comes on when the parking brake is applied and goes off when it is released.
OK: The brake warning light operates as specified above.
OK: GO TO STEP 3
NG: Go to next step.
- Check that the brake warning light comes on when the parking brake is applied and goes off when it is released.
- INSPECT PARKING BRAKE SWITCH
- Remove the parking brake switch.
- Measure the resistance according to the value(s) in the table below.STANDARD RESISTANCE
Tester connection Condition Specified condition Switch connector -Switch body ON (When shaft is not pressed) Below 1 Ω Switch connector -Switch body OFF (When shaft is pressed) 10 kΩ or higher
NG: REPLACE PARKING BRAKE SWITCH
OK: Go to next step.
- CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY - PARKING BRAKE SWITCH)
- Disconnect the multi-display connector J50 and parking brake switch connector A25 or J88.
- Measure the resistance according to the value(s) in the table below.STANDARD RESISTANCE
Tester connection Condition Specified condition PKB - A25-1 (A/T) Always Below 1 Ω PKB - J88-1 (M/T) Always Below 1 Ω PKB - Body ground Always 10 kΩ or higher
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE