Brake Warning Light Remains ON: Procedure

1. Check if a CAN communication system DTC is output. Refer to DIAGNOSIS SYSTEM .

   Result

   Result	Proceed to
   DTC is not output	A
   DTC is output	B

B → See step   14 

A: Go to next step 

1. Check if a multiplex communication system DTC is output. Refer to DTC CHECK / CLEAR .

   Result

   Result	Proceed to
   DTC is not output	A
   DTC is output	B

B → See step   15 

A: Go to next step 

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

   OK

   The connector is securely connected.

NG → See step   16 

OK: Go to next step 

1. Check the battery voltage.

   Standard Voltage

   11 to 14 V

NG → See step   17 

OK: Go to next step 

1. Disconnect the skid control ECU connector.
   Fig 1: Identifying Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the engine switch on (IG).
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   J77-1 (IG1) - Body ground	Engine switch on (IG)	11 to 14 V

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

OK: Go to next step 

1. Turn the engine switch off.
   Fig 2: Identifying Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the skid control ECU connectors.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J78-26 (GND1) - Body ground	Always	Below 1 Ω
   J78-14 (GND2) - Body ground	Always	Below 1 Ω
   A35-22 (GND3) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT) 

OK: Go to next step 

1. Reconnect the skid control ECU connectors.
2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG).
4. Select the Data List mode on the Techstream. Refer to DATA LIST / ACTIVE TEST .
   DATA LIST
   
   

   Tester Display	Measurement Item / Range	Normal Condition	Diagnostic Note
   Parking Brake SW	Parking brake switch / ON or OFF	ON: Parking brake applied OFF: Parking brake released	-

5. Using the Techstream, check that the switch condition on the Techstream display changes according to parking brake pedal operation.

   OK

   The Techstream displays ON or OFF according to parking brake pedal operation.

NG → See step   11 

OK: Go to next step 

1. Turn the engine switch off.
   Fig 3: Inspecting Brake Fluid Level Warning Switch

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Remove the reservoir filler cap and strainer.
3. Disconnect the brake fluid level warning switch connector.
4. 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.

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   1 (+) - 2 (E)	Brake fluid level warning switch OFF (Float up)	1.9 to 2.1 kΩ
   1 (+) - 2 (E)	Brake fluid level warning switch ON (Float down)	Below 1 Ω

   HINT: 

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

NG → See step   18 

OK: Go to next step 

1. Disconnect the combination meter connector.
   Fig 4: Identifying Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J35-15 (SW) - A16-1 (+)	Always	Below 1 Ω
   J35-15 (SW) - Body ground	Always	10 kΩ or higher
   A16-2 (E) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Perform the Active Test of the combination meter (meter CPU) using the Techstream. Refer to DATA LIST / ACTIVE TEST .
2. Check the combination meter.

   HINT: 

   Reinstall the connectors and restore the vehicle to its prior condition before checking the combination meter.

   OK

   The brake warning light turns on or off in accordance with the Techstream operation.

   HINT: 

   If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part. Refer to PROBLEM SYMPTOMS TABLE .

NG → See step   19 

OK → See step   13 

1. Turn the engine switch off.
   Fig 5: Inspecting Parking Brake Switch

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the parking brake switch connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

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

NG → See step   20 

OK: Go to next step 

1. Disconnect the skid control ECU connector.
   Fig 6: Identifying Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J77-14 (PKB) - A25-1	Always	Below 1 Ω
   J77-14 (PKB) - Body ground	Always	10 kΩ or higher

   HINT: 

   If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part. Refer to PROBLEM SYMPTOMS TABLE .

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   13