Brake Warning Light Remains ON [08/2015 - ]: Procedure

1. Check if a CAN communication system DTC is output. Refer to DIAGNOSIS SYSTEM [08/2015 - ] .

   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

   Result

   Result	Proceed to
   OK	A
   NG (for 2GR-FE)	B
   NG (for 2AR-FE)	C

B → See step   14 

C → See step   19 

A: Go to next step 

1. Disconnect the skid control ECU connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A49-25 (+BS) - Body ground*1 A94-25 (+BS) - Body ground*2	Always	11 to 14 V
   A49-25 (+BS) - A49-38 (GND1)*1 A94-25 (+BS) - A94-38 (GND1)*2	Always	11 to 14 V
   A49-28 (IG1) - Body ground*1 A94-28 (IG1) - Body ground*2	Ignition switch ON	11 to 14 V
   A49-28 (IG1) - A49-38 (GND1)*1 A94-28 (IG1) - A94-38 (GND1)*2	Ignition switch ON	11 to 14 V

   *1: for 2AR-FE (w/o Dynamic Radar Cruise Control System)

   *2: for 2AR-FE (w/ Dynamic Radar Cruise Control System), 2GR-FE

   TEXT IN ILLUSTRATION
   
   

   *A	for 2AR-FE (w/o Dynamic Radar Cruise Control System)
   *B	for 2AR-FE (w/ Dynamic Radar Cruise Control System), 2GR-FE
   *a	Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

OK: Go to next step 

1. Turn the ignition switch off.

   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
   A49-38 (GND1) - Body ground*1 A94-38 (GND1) - Body ground*2	Always	Below 1 Ω

   *1: for 2AR-FE (w/o Dynamic Radar Cruise Control System)

   *2: for 2AR-FE (w/ Dynamic Radar Cruise Control System), 2GR-FE

   TEXT IN ILLUSTRATION
   
   

   *A	for 2AR-FE (w/o Dynamic Radar Cruise Control System)
   *B	for 2AR-FE (w/ Dynamic Radar Cruise Control System), 2GR-FE
   *a	Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

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 the Data List using the Techstream. Refer to DATA LIST / ACTIVE TEST [08/2015 - ] .
   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 signal received when the parking brake is operated.

   OK

   When the parking brake is operated, the display changes as shown above.

NG → See step   10 

OK: Go to next step 

1. Turn the ignition switch off.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Remove the reservoir filler cap and the 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 changes according to the brake fluid level.

   Standard Resistance

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

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Brake Fluid Level Warning Switch (Brake Master Cylinder Reservoir Sub-assembly))

   HINT: 

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

NG → See step   16 

OK: Go to next step 

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I18-19 (SW) - A30-1 (+)	Always	Below 1 Ω
   I18-19 (SW) - Body ground	Always	10 kΩ or higher
   A30-2 (E) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the combination meter assembly connector and the brake fluid level warning switch connector.
2. Perform an Active Test of the combination meter assembly (meter CPU) using the Techstream. Refer to DATA LIST / ACTIVE TEST [08/2015 - ] .
3. Check the combination meter assembly.

   OK

   The brake warning light turns on or off in accordance with the Active Test 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 parts. Refer to PROBLEM SYMPTOMS TABLE [08/2015 - ] .

NG → See step   17 

OK → See step   12 

1. Turn the ignition switch off.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Disconnect the parking brake switch assembly 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

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Parking Brake Switch Assembly)

NG → See step   15 

OK: Go to next step 

1. Disconnect the main body ECU connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3D-20 (PKB) - A42-1 (+)	Always	Below 1 Ω
   3D-20 (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 parts. Refer to PROBLEM SYMPTOMS TABLE [08/2015 - ] .

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   18