Parking Brake Switch Circuit: Procedure

1. 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.

NG → See step   3 

OK: Go to next step 

1. Disconnect the display and navigation module display connector.
   Fig 1: Display And Navigation Module Display Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the parking brake switch connector.
   Fig 2: Parking Brake Switch Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester connection	Condition	Specified condition
   G4-17 (PKB) - A49-1	Always	Below 1 Ω
   G4-17 (PKB) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Display and Navigation Module Display)
   *2	Front view of wire harness connector (to Parking Brake Switch)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4 

1. Disconnect the parking brake switch connector.
   Fig 3: Inspecting Parking Brake Switch

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester connection	Condition	Specified condition
   A49-1 - Switch body	ON (When shaft is not pressed)	Below 1 Ω
   A49-1 - Switch body	OFF (When shaft is pressed)	10 kΩ or higher

NG → See step   5 

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR