Parking Brake Switch Circuit: Procedure

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

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

   OK

   Normal conditions listed above are displayed.

NG → See step   2 

OK → See step   5 

1. Remove the parking brake switch assembly. Refer to REMOVAL .
2. Inspect the parking brake switch assembly. Refer to INSPECTION .

NG → See step   6 

OK: Go to next step 

1. Disconnect the 2C instrument panel junction block assembly connector.
2. Disconnect the A25 parking brake switch assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A25-1 - 2C-20	Always	Below 1 Ω
   A25-1 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the instrument panel junction block assembly. Refer to REMOVAL .
2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
   Fig 1: Inspecting Instrument Panel Junction Block Assembly Connector Terminals

   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
   2C-20 - MB-12 (PKB)	Always	Below 1 Ω
   2C-20 - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Instrument Panel Junction Block Assembly)

NG → See step   8 

OK → See step   7