Parking Brake Switch Circuit [12/2013 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Main Body / Data List.
5. Read the display on the Techstream.

   Body Electrical > Main Body > Data List 

   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	-

   Body Electrical > Main Body > Data List 

   Tester Display
   Parking Brake SW

   OK

   Normal conditions listed above are displayed.

   Result

   Proceed to
   OK
   NG

Result:  1

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [12/2013 - 11/2016]  Refer to  PROBLEM SYMPTOMS TABLE [11/2016 - ] 

Result:  2

NG 

See step  2

1. Remove the parking brake switch assembly.

   Refer to REMOVAL [12/2013 - ]

2. Inspect the parking brake switch assembly.

   Refer to INSPECTION [12/2013 - ]

   Result

   Proceed to
   OK
   NG

Result:  2

NG 

REPLACE PARKING BRAKE SWITCH ASSEMBLY. Refer to  REMOVAL [12/2013 - ] 

Result:  1

OK 

See step  3

1. Disconnect the 4F instrument panel junction block assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A58-1 (+) - 4F-28	Always	Below 1 Ω
   A58-1 (+) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result:  2

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result:  1

OK 

See step  4

1. Remove the instrument panel junction block assembly.

   Refer to REMOVAL [12/2013 - ]

2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Component without harness connected (Instrument Panel Junction Block Assembly)

   -

   -

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4F-28 - MB-12 (PKB)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result:  1

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [12/2013 - ] 

Result:  2

NG 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [12/2013 - ]