Parking Brake Switch Circuit: Procedure

1. Enter the "Display Check" mode and select "Vehicle Signal Check". Refer to OPERATION CHECK .
   Fig 1: Screen Display - Vehicle Signal Check Mode (PKB)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check that the display changes between ON and OFF according to the parking brake operation.

   OK

   Parking Brake Position	Display
   Applied	ON
   Released	OFF

   HINT: 

   This display is updated once per second. As a result, it is normal for the display to lag behind the actual change in the switch.

NG → See step   2 

OK → See step   5 

1. Remove the parking brake switch assembly connector. Refer to REMOVAL .
   Fig 2: Checking 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	Switch Condition	Specified Condition
   1 - Body ground	Parking brake switch ON (Switch pin released)	Below 1 Ω
   	Parking brake switch OFF (Switch pin pushed in)	10 kΩ or higher

NG → See step   4 

OK: Go to next step 

1. Disconnect the D55 navigation receiver assembly connector.
2. Disconnect the A3 parking brake switch assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   D55-1 (PKB) - A3-1	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   D55-1 (PKB) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   5