DESCRIPTION
The skid control ECU is connected to the combination meter via CAN communication.
If any of the following is detected, the brake warning light remains on:
The skid control ECU connector is disconnected from the skid control ECU.
The brake fluid level is insufficient.
The parking brake is applied.
EBD operation is not possible.
WIRING DIAGRAM
INSPECTION PROCEDURE
Note
When replacing the brake actuator assembly, perform zero point calibration Click here.
PROCEDURE
CHECK CAN COMMUNICATION SYSTEM
Check if CAN communication system DTCs are output Click here.
Result | Proceed to |
---|---|
DTC not output | A |
DTC output | B |
B |
CHECK CAN COMMUNICATION SYSTEM Click here |
A |
CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED
Check if the skid control ECU connector is securely connected.
OK |
---|
The connector is securely connected. |
NG |
CONNECT CONNECTOR TO ECU CORRECTLY |
OK |
INSPECT BATTERY
Check the battery voltage.
Standard voltage |
---|
11 to 14 V |
NG |
CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here |
OK |
INSPECT SKID CONTROL ECU (IG1 TERMINAL)
Disconnect the A16 or A17 skid control ECU connector.
Turn the ignition switch to ON.
*A | for LHD |
*B | for RHD |
*1 | Front view of wire harness connector (to Skid Control ECU) |
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
||||||
|
Result | Proceed to |
---|---|
OK | A |
NG (w/ Stop and Start System) | B |
NG (w/o Stop and Start System) | C |
B |
GO TO STOP AND START SYSTEM Click here |
C |
REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT) |
A |
INSPECT SKID CONTROL ECU (GND TERMINAL)
Turn the ignition switch off.
*A | for LHD |
*B | for RHD |
*1 | Front view of wire harness connector (to Skid Control ECU) |
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
||||||
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT) |
OK |
READ VALUE USING INTELLIGENT TESTER (PARKING BRAKE SWITCH)
Reconnect the skid control ECU connector.
Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.
Enter the following menus: Chassis / ABS/VSC/TRC / 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 |
- |
Using the intelligent tester, check the input of the switch operation when the parking brake pedal is operated.
OK |
---|
When the parking brake is operated, the display changes as shown above. |
NG |
INSPECT PARKING BRAKE SWITCH Click here |
OK |
INSPECT BRAKE FLUID LEVEL WARNING SWITCH
*1 | Component with out harness connected (Brake Fluid Level Warning Switch) |
Turn the ignition switch off.
Remove the reservoir filler cap and strainer.
Disconnect the brake fluid level warning switch connector.
Measure the resistance according to the value(s) in the table below.
Tech Tips
A float is located inside the reservoir. Its position can be changed by increasing or decreasing the level of brake fluid.
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Tech Tips
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) Click here |
OK |
CHECK HARNESS AND CONNECTOR (COMBINATION METER - BRAKE FLUID LEVEL WARNING SWITCH)
Disconnect the D2 combination meter connector.
*1 | Front view of wire harness connector (to Brake Fluid Level Warning Switch) |
*2 | Front view of wire harness connector (to Combination Meter) |
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
INSPECT COMBINATION METER ASSEMBLY
Connect the intelligent tester to the DLC3.
Perform Active Test of the combination meter using the intelligent tester Click here.
OK |
---|
The brake warning light turns ON or OFF in accordance with the intelligent tester. |
Tech Tips
Reinstall the connectors and restore the vehicle to its prior condition before checking the combination meter.
NG |
REPLACE COMBINATION METER ASSEMBLY Click here |
OK |
REPLACE BRAKE ACTUATOR ASSEMBLY Click here
REPLACE COMBINATION METER ASSEMBLY
Turn the ignition switch off.
Replace the combination meter Click here.
NEXT |
INSPECT COMBINATION METER ASSEMBLY
Connect the intelligent tester to the DLC3.
Perform Active Test of the combination meter using the intelligent tester Click here.
OK |
---|
The brake warning light turns ON or OFF in accordance with the intelligent tester. |
NG |
REPLACE BRAKE ACTUATOR ASSEMBLY Click here |
OK |
END
INSPECT PARKING BRAKE SWITCH
*1 | Component without harness connected (Parking Brake Switch) |
Turn the ignition switch off.
Disconnect the parking brake switch connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
NG |
REPLACE PARKING BRAKE SWITCH Click here |
OK |
CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - PARKING BRAKE SWITCH)
Disconnect the 3C instrument panel junction block assembly connector.
*1 | Front view of wire harness connector (to Parking Brake Switch) |
*2 | Front view of wire harness connector (to Instrument Panel Junction Block Assembly) |
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - MAIN BODY ECU)
Remove the main body ECU from the instrument panel junction block assembly.
*1 | Front view of wire harness connector (to Instrument Panel Junction Block Assembly) |
*2 | Front view of wire harness connector (to Main Body ECU) |
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
NG |
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
OK |
REPLACE MAIN BODY ECU