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   13 

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 → See step   14 

OK: Go to next step 

1. Disconnect the skid control ECU connector.
   Fig 1: Inspecting Skid Control ECU A38 Connector Terminals

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

   Standard voltage

   Tester Connection	Switch Condition	Specified Condition
   A38-34 (IG1) - Body ground	Ignition switch ON	11 to 14 V

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

OK: Go to next step 

1. Turn the ignition switch off.
   Fig 2: Inspecting Skid Control ECU A38 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
   A38-1 (GND1) - 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 connector.
2. Connect the Techstream to the DLC3.
3. Turn the ignition switch to ON.
4. Select Data List mode on the Techstream. Refer to DATA LIST / ACTIVE TEST .
   ABS / VSC / TRAC
   
   

   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 the switch operation when the parking brake is applied.

   OK

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

NG → See step   10 

OK: Go to next step 

1. Turn the ignition 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	Switch OFF (Float up)	1.9 to 2.1 kΩ
   1 - 2	Switch ON (Float down)	Below 1 Ω

   HINT: 

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

NG → See step   15 

OK: Go to next step 

1. Disconnect the combination meter connector.
   Fig 4: Checking Combination Meter And Brake Fluid Warning Switch 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
   E55-40 (SW) - A8-1 (+)	Always	Below 1 Ω
   E55-40 (SW) - Body ground	Always	10 kΩ or higher
   A8-2 (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.
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 the 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   16 

OK → See step   12 

1. Turn the ignition 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   17 

OK: Go to next step 

1. Disconnect the main body ECU connector.
   Fig 6: Checking Main Body ECU And Parking Brake Switch 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
   2C-5 (PKB) - E16-1	Always	Below 1 Ω
   2C-5 (PKB) - Body ground	Always	10 kΩ or higher

   HINT: 

   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. Refer to PROBLEM SYMPTOMS TABLE .

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK)