Inspection Procedure

1. Check if a CAN communication system DTC is output (See DTC CHECK / CLEAR  ).

   Result 

   DTC RESULT REFERENCE
   
   

   Result	Proceed to
   CAN communication system DTC is not output	A
   CAN communication system DTC is output	B

B: INSPECT CAN COMMUNICATION SYSTEM  (See HOW TO PROCEED WITH TROUBLESHOOTING )

A: Go to next step 

1. Check if a multiplex communication system DTC is output (See DTC CHECK/CLEAR ).

   Result 

   DTC RESULT REFERENCE
   
   

   Result	Proceed to
   Multiplex communication system DTC is not output	A
   Multiplex communication system DTC is output	B

B: INSPECT MULTIPLEX COMMUNICATION SYSTEM  (See HOW TO PROCEED WITH TROUBLESHOOTING )

A: Go to next step 

1. Check if the skid control ECU connector is securely connected.

   OK: 

   The connector is securely connected. 

NG: CONNECT CONNECTOR TO ECU CORRECTLY 

OK: Go to next step 

1. Check the battery voltage.

   Standard voltage: 

   11 to 14 V 

NG: CHECK OR REPLACE CHARGING SYSTEM OR BATTERY  (See ON-VEHICLE INSPECTION )

OK: Go to next step 

1. Disconnect the skid control ECU connector.
2. Turn the ignition switch to the ON position.
3. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Switch Condition	Specified Condition
   S1-46 (IG1) - Body ground	Ignition switch ON	10 to 14 V

Fig 1: Identifying Skid Control ECU (IG1 Terminal)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT) 

OK: Go to next step 

1. Turn the ignition switch off.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   RESISTANCE REFERENCE
   
   

   Tester Connection	Condition	Specified Condition
   S1-32 (GND1) - Body ground	Always	Below 1 Ω
   S1-1 (GND2) - Body ground	Always	Below 1 Ω

Fig 2: Identifying Skid Control ECU Connector Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT) 

OK: Go to next step 

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

   Standard resistance 

   RESISTANCE REFERENCE
   
   

   Tester Connection	Switch Condition	Specified Condition
   P6-1 - Body ground	Parking brake switch ON (Switch pin free)	Below 1 Ω
   P6-1 - Body ground	Parking brake switch OFF (Switch pin pushed in)	10 kΩ or higher

Fig 3: Inspecting Parking Brake Switch
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE PARKING BRAKE SWITCH  (See DISASSEMBLY )

OK: Go to next step 

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

   Standard resistance 

   RESISTANCE REFERENCE
   
   

   Tester Connection	Condition	Specified Condition
   S1-28 (PKB) - P6-1	Always	Below 1 Ω
   S1-28 (PKB) - Body ground	Always	10 kΩ or higher

Fig 4: Identifying Skid Control ECU And Parking Brake Switch
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL ECU - PARKING BRAKE SWITCH) 

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 according to the value(s) in the table below.

   HINT:

   A float is located inside the reservoir. Its position can be changed by increasing or decreasing the level of brake fluid.

   Fig 5: Inspecting Brake Fluid Level Warning Switch

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance 

   RESISTANCE REFERENCE
   
   

   Tester Connection	Switch Condition	Specified Condition
   B1-1 - B1-2	Float up (Switch OFF)	10 kΩ or higher
   B1-1 - B1-2	Float down (Switch ON)	Below 1 Ω

   HINT:

   If there is no problem after finishing the above check, adjust the brake fluid level to the MAX level.

NG: REPLACE BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY (BRAKE FLUID LEVEL WARNING SWITCH)  (See REMOVAL )

OK: Go to next step 

1. Disconnect the combination meter connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   RESISTANCE REFERENCE
   
   

   Tester Connection	Condition	Specified Condition
   C9-8 - B1-1	Always	Below 1 Ω
   C9-8 - Body ground	Always	10 kΩ or higher
   B1-2 -Body ground	Always	Below 1 Ω

Fig 6: Identifying Combination Meter And Brake Fluid Level Warning Switch
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Connect the intelligent tester to the DLC3.
2. Perform Active Test of the combination meter (meter CPU) using the intelligent tester (See DATA LIST / ACTIVE TEST ).

   OK: 

   The brake warning light blinks or turns off in accordance with the intelligent tester. 

   HINT:

   • Reinstall the connectors and restore the vehicle to its prior condition before checking the combination meter.
   • If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part (See PROBLEM SYMPTOMS TABLE  ).

NG: REPLACE COMBINATION METER ASSEMBLY  (See REMOVAL )

OK: REPLACE BRAKE ACTUATOR ASSEMBLY (See  REMOVAL   )