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

1. Using the Techstream, read the Data List.

   Refer to DATA LIST / ACTIVE TEST [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 is displayed.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [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. Disconnect the 3H cowl side junction block LH connector.
2. Disconnect the A62 parking brake switch assembly connector.
3. Disconnect the H203 radio and display receiver assembly connector.
4. 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 [08/2019 - ]

   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 [08/2019 - ]

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 [08/2019 - ] 

Result: 

NG 

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