Inspection Procedure

1. Check that the brake warning light comes on when the parking brake is applied and goes off when it is released.

   OK: 

   The brake warning light operates as specified above. 

OK: Go to  step  3

NG: Go to next step 

1. Remove the parking brake switch.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   Switch connector - Switch body	Shaft is not pressed	Below 1 Ω
   Switch connector - Switch body	Shaft is pressed	10 kΩ or higher

Fig 1: Measuring Resistance Between Parking Brake Switch

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE PARKING BRAKE SWITCH 

OK: Go to next step 

1. Disconnect the K46 display connector.
2. Disconnect the A31 switch connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Specified Condition
   K46-23 (PKB) - A31-1	Below 1 Ω
   K46-23 (PKB) - Body ground	10 kΩ or higher

Fig 2: Identifying A31 Switch And K46 Display Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE