Inspection Procedure

1. Check that the brake fluid level is sufficient.

   HINT:

   • If the fluid level drops, check for a fluid leak, and repair if found.
   • If no leaks exist, add and adjust fluid and then check that the trouble code is not output again.

   OK: 

   Brake fluid level is proper. 

NG: ADD BRAKE FLUID 

OK: Go to next step 

1. Check if the DTCs are recorded (see DTC CHECK / CLEAR  ).

OK: REPAIR CIRCUIT INDICATED BY OUTPUT CODE 

NG: Go to next step 

1. Remove the parking brake switch connector.
2. Measure the resistance of the switch.

   Standard resistance 

   STANDARD RESISTANCE REFERENCE CHART
   
   

   Tester Connection	Switch Condition	Specified Condition
   P2-1 - Ground part	Not pushed	Below 1 Ω
   P2-1 - Ground part	Pushed	10 kΩ or higher

NG: REPLACE PARKING BRAKE SWITCH ASSEMBLY 

Fig 1: Measuring Resistance Of Switch

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step 

1. Disconnect the S9 ECU connector.
2. Disconnect the P2 switch connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   STANDARD RESISTANCE REFERENCE CHART
   
   

   Tester Connection	Specified Condition
   S9-14 (PKB) - P2-1 (PKB)	Below 1 Ω
   S9-14 (PKB) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

Fig 2: Disconnecting S8 ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step 

1. Remove the reservoir tank cap and strainer.
2. Disconnect the brake fluid level warning switch connector.
3. Measure the resistance of the switch.

   Standard resistance 

   STANDARD RESISTANCE REFERENCE CHART
   
   

   Tester Connection	Fluid Level	Specified Condition
   B1-1 - B1-2	Proper	1.8 to 2.16 kΩ
   B1-1 - B1-2	Below minimum level	10 kΩ or higher

NG: REPLACE BRAKE FLUID LEVEL WARNING SWITCH 

Fig 3: Inspecting Brake Fluid Level Warning Switch

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step 

1. Check the skid control ECU connector's connecting condition.

   OK: 

   The connector should be securely connected. 

NG: CONNECT CONNECTOR TO ECU CORRECTLY 

OK: Go to next step 

1. Select the ACTIVE TEST, generate a control command, and then check that the brake warning light operates.

   Skid control ECU 

   SKID CONTROL ECU DIAGNOSTIC CHART
   
   

   Item	Test Details	Diagnostic Note
   BRAKE WARN LIGHT	Turns BRAKE warning light ON / OFF	Observe combination meter

   OK: 

   The brake warning light turns on or off. 

NG: REPAIR OR REPLACE COMBINATION METER ASSEMBLY 

OK: REPLACE SKID CONTROL ECU