Parking Brake Switch Circuit [08/2017 - 08/2019]: Procedure

1. Using the Techstream, read the Data List.

   Refer to DATA LIST / ACTIVE TEST [08/2017 - 08/2019]

   MAIN BODY
   
   

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

   OK

   Normal condition listed above are displayed.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [08/2017 - 08/2019] 

Result: 

NG 

See step  2

1. Remove the parking brake switch assembly.

   Refer to ON-VEHICLE INSPECTION [08/2015 - ]

2. Inspect the parking brake switch assembly.

   Refer to ON-VEHICLE INSPECTION [08/2015 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE PARKING BRAKE SWITCH ASSEMBLY. Refer to  ON-VEHICLE INSPECTION [08/2015 - ] 

Result: 

OK 

See step  3

1. *1: w/ Navigation System
2. *2: w/o Navigation System

1. Disconnect the 3H cowl side junction block LH connector.
2. Disconnect the A62 parking brake switch assembly connector.
3. Disconnect the H158 navigation receiver assembly connector.*1
4. Disconnect the H159 radio and display receiver assembly connector.*2
5. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3H-18 - A62-1	Always	Below 1 Ω
   3H-18 or A62-1 - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Remove the cowl side junction block LH.

   Refer to REMOVAL [08/2017 - 08/2019]

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Cowl Side Junction Block LH)

2. Remove the main body ECU (multiplex network body ECU) from the cowl side junction block LH.

   Refer to REMOVAL [08/2017 - 08/2019]

3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3H-18 - A-12 (PKB)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [08/2017 - 08/2019] 

Result: 

NG 

REPLACE COWL SIDE JUNCTION BLOCK LH. Refer to  REMOVAL [08/2017 - 08/2019]