Electric Parking Brake AUTO Switch Light Circuit: Procedure

1. Turn the engine switch off.
2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG) and the Techstream on.
4. Enter the following menus: Chassis / Electric Parking Brake / Data List.
5. Check the values by referring to the table below.
   ELECTRIC PARKING BRAKE
   
   

   Tester Display	Measurement Item/ Range	Switch Condition	Normal Condition
   AUTO Switch	AUTO switch input information display/ ON or OFF	Engine switch on (IG) AUTO switch is pressed and held	ON: AUTO switch is pressed and held OFF: AUTO switch OFF (released)

   OK

   On the Techstream screen, item changes between ON and OFF according to switch operation.

   RESULT
   
   

   Result	Proceed to
   NG	A
   OK	B

B → See step   4 

A: Go to next step 

1. Remove the electric parking brake switch. Refer to REMOVAL .
2. Measure the resistance according to the value(s) in the table below.
   Fig 1: Identifying Electric Parking Brake Switch Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester Connection	Switch Condition	Specified Condition
   5 (AUTO) - 8 (GND)	AUTO switch is pressed and held	Below 1 Ω
   	AUTO switch OFF (released)	1 MΩ or higher

NG → See step   5 

OK: Go to next step 

1. Disconnect the S48 ECU connector.
2. Disconnect the L39 switch connector.
3. Measure the resistance according to the value(s) in the table below.
   Fig 2: Identifying S48 ECU And L39 Switch Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester Connection	Condition	Specified Condition
   S48- 5 (AUTO) - L39-5 (AUTO)	Always	Below 5 Ω
   S48- 5 (AUTO) - Body ground	Always	100 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the S46 ECU connector.
2. Disconnect the L39 switch connector.
3. Measure the resistance according to the value(s) in the table below.
   Fig 3: Identifying S46 ECU Connector And L39 Switch Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester Connection	Condition	Specified Condition
   S46-6 (LPA) - L39-3 (IND-)	Always	Below 5 Ω
   S46-6 (LPA) - Body ground	Always	100 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   6