Parking Brake Switch Circuit: Procedure

1. Connect Techstream to the DLC3.
2. Turn the ignition switch on (IG).
3. Turn Techstream on.
4. Select the following menu items: Body Electrical / Main Body / Data List.
5. Read the display on Techstream.
   MAIN BODY:
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Parking Brake SW	Parking brake SW signal / ON or OFF	ON: Parking brake switch is ON OFF: Parking brake switch is OFF	-

   OK

   Normal conditions listed above are displayed.

NG → See step   2 

OK → See step   4 

1. Remove the parking brake switch assembly.
   Fig 1: Measuring Resistance Of Parking Brake Switch Assembly

   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
   1 - Switch body	Shaft is pushed in (OFF)	10 kΩ or higher
   1 - Switch body	Shaft is not pushed in (ON)	Below 1 Ω

NG → REPLACE PARKING BRAKE SWITCH ASSEMBLY 

OK: Go to next step 

1. Disconnect the 1C instrument panel junction block assembly connector.
   Fig 2: Checking Harness And Connector (Switch - Instrument Panel Junction Block)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the A17 switch connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   1C-14 - A17-1	Always	Below 1 Ω
   1C-14 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)