BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS  ANTI-LOCK BRAKE SYSTEM  Brake Warning Light Remains ON  


DESCRIPTION

The skid control ECU (brake actuator assembly) is connected to the combination meter assembly via CAN communication.

If any of the following is detected, the brake warning light remains on:

·

The skid control ECU (brake actuator assembly) connector is disconnected from the skid control ECU (brake actuator assembly).

·

The brake fluid level is insufficient.

·

The parking brake is applied.

·

EBD operation is not possible.


WIRING DIAGRAM

C291705E10
6.198,2.479 6.813,2.677 0.615,0.198 10 false CANH 6.208,2.021 6.823,2.219 0.615,0.198 10 false CANL 6.208,3.677 6.823,3.875 0.615,0.198 10 false IG1 6.208,5.448 6.823,5.646 0.615,0.198 10 false GND1 5.917,1.854 6.531,2.052 0.615,0.198 10 false 14 5.917,2.292 6.531,2.49 0.615,0.198 10 false 25 5.917,3.552 6.531,3.75 0.615,0.198 10 false 34 5.917,5.302 6.531,5.5 0.615,0.198 10 false 1 4.833,1.865 5.448,2.063 0.615,0.198 10 false 31 4.833,2.302 5.448,2.5 0.615,0.198 10 false 32 4.313,2.042 4.927,2.24 0.615,0.198 10 false CANL 4.292,2.469 4.906,2.667 0.615,0.198 10 false CANH 2.625,2.26 3.24,2.458 0.615,0.198 10 false SW 2.313,2.146 2.927,2.344 0.615,0.198 10 false 12 2.75,2.917 3.365,3.115 0.615,0.198 10 false E43 2.75,3.083 5.271,3.333 2.521,0.25 10 false Combination Meter Assembly 0.635,0.438 1.25,0.635 0.615,0.198 10 false CANH 0.646,1.083 1.26,1.281 0.615,0.198 10 false CANL 1.177,0.24 1.792,0.438 0.615,0.198 10 false 14 1.177,0.875 1.792,1.073 0.615,0.198 10 false 13 1.146,0.448 1.76,0.646 0.615,0.198 10 false E31 1.146,1.094 1.76,1.292 0.615,0.198 10 false E31 0.531,5.542 1.146,5.74 0.615,0.198 10 false PKB 0.448,5.792 1.063,5.99 0.615,0.198 10 false 12 1.177,7 1.792,7.198 0.615,0.198 10 false 3E 1.198,6.771 1.813,6.969 0.615,0.198 10 false 30 2.042,5.333 2.656,5.531 0.615,0.198 10 false 1 1.833,5.792 3.885,6.365 2.052,0.573 10 false Brake Fluid Level Warning Switch (Brake Master Cylinder Reservoir Assembly) 1.833,5.635 2.448,5.833 0.615,0.198 10 false A8 1.99,7.625 3.333,8.083 1.344,0.458 10 false Parking Brake Switch Assembly 3.333,5.344 3.948,5.542 0.615,0.198 10 false 2 1.979,6.885 2.594,7.083 0.615,0.198 10 false 1 2,7.469 2.615,7.667 0.615,0.198 10 false L17 1.969,3.656 4.49,3.906 2.521,0.25 10 false from IG1 NO. 1 Relay 4.302,3.844 6.823,4.094 2.521,0.25 10 false ECU-IG NO. 1 5.583,8.052 7.125,8.479 1.542,0.427 10 false Skid Control ECU (Brake Actuator Assembly) 5.583,7.885 6.198,8.083 0.615,0.198 10 false A48 0.073,8.052 1.698,8.51 1.625,0.458 10 false Main Body ECU (Multiplex Network Body ECU) 1.917,8.406 3.958,8.813 2.042,0.406 10 false : CAN Communication Line 2.302,5.448 2.917,5.646 0.615,0.198 10 false + 3.073,5.458 3.688,5.656 0.615,0.198 10 false E 2.198,7.115 2.813,7.313 0.615,0.198 10 false + 4.469,3.552 5.083,3.75 0.615,0.198 10 false 1 4.833,3.552 5.448,3.75 0.615,0.198 10 false 2

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.


PROCEDURE

1.CHECK CAN COMMUNICATION SYSTEM
a.

Check if CAN communication system DTCs are output.

Click herePower Source / Network>NETWORKING>CAN COMMUNICATION SYSTEM>DIAGNOSIS SYSTEM


Result:
Result Proceed to
DTCs are not output. A
DTCs are output. B



A

2.CHECK IF BRAKE ACTUATOR ASSEMBLY CONNECTOR IS SECURELY CONNECTED

B

INSPECT CAN COMMUNICATION SYSTEM

Click herePower Source / Network>NETWORKING>CAN COMMUNICATION SYSTEM>HOW TO PROCEED WITH TROUBLESHOOTING


2.CHECK IF BRAKE ACTUATOR ASSEMBLY CONNECTOR IS SECURELY CONNECTED
a.

Check if the skid control ECU (brake actuator assembly) connector is securely connected.

OK:

The connector is securely connected.



Result:
Proceed to
OK
NG



OK

3.CHECK BATTERY

NG

CONNECT CONNECTOR TO BRAKE ACTUATOR ASSEMBLY CORRECTLY

3.CHECK BATTERY
a.

Check the battery voltage.

Standard Voltage:

11 to 14 V



Result:
Proceed to
OK
NG



OK

4.CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)

NG

CHECK OR REPLACE CHARGING SYSTEM COMPONENT OR BATTERY

for 1ZR-FE: Click herePower Source / Network>1ZR-FE BATTERY / CHARGING>CHARGING SYSTEM>ON-VEHICLE INSPECTION

for 2ZR-FE: Click herePower Source / Network>2ZR-FE BATTERY / CHARGING>CHARGING SYSTEM>ON-VEHICLE INSPECTION

for 2NZ-FE: Click herePower Source / Network>2NZ-FE BATTERY / CHARGING>CHARGING SYSTEM>ON-VEHICLE INSPECTION


4.CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)
a.
C277404C14
0.167,1 0.583,1.25 0.417,0.25 0.76,1.844 1.156,1.042 false 2.49,1.865 2.281,1.323 false 0.25,1.042 0.708,1.24 0.458,0.198 10 false A48 0.104,0.104 0.417,0.302 0.313,0.198 10 false *a 0.531,1.875 1.146,2.073 0.615,0.198 10 false GND1 2.365,1.896 2.979,2.094 0.615,0.198 10 false IG1
*a Front view of wire harness connector
(to Skid Control ECU (Brake Actuator Assembly))


Disconnect the A48 skid control ECU (brake actuator assembly) connector.


b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
A48-34 (IG1) - Body ground Ignition switch ON 11 to 14 V
A48-34 (IG1) - A48-1 (GND1) Ignition switch ON 11 to 14 V



Result:
Proceed to
OK
NG



OK

5.CHECK HARNESS AND CONNECTOR (GND1 TERMINAL)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)

5.CHECK HARNESS AND CONNECTOR (GND1 TERMINAL)
a.
C277404C15
0.167,1 0.583,1.25 0.417,0.25 0.76,1.844 1.156,1.042 false 0.26,1.042 0.719,1.24 0.458,0.198 10 false A48 0.104,0.104 0.417,0.302 0.313,0.198 10 false *a 0.531,1.875 1.146,2.073 0.615,0.198 10 false GND1
*a Front view of wire harness connector
(to Skid Control ECU (Brake Actuator Assembly))


Turn the ignition switch off.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
A48-1 (GND1) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

6.READ VALUE USING GTS (PARKING BRAKE SWITCH ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT)

6.READ VALUE USING GTS (PARKING BRAKE SWITCH ASSEMBLY)
a.

Reconnect the A48 skid control ECU (brake actuator assembly) connector.


b.

Connect the GTS to the DLC3.


c.

Turn the ignition switch to ON.


d.

Select the Data List using the GTS.

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>DATA LIST / ACTIVE TEST

Chassis > ABS/VSC/TRC > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Parking Brake SW Parking brake switch assembly ON or OFF ON: Parking brake applied
OFF: Parking brake released 		-
Chassis > ABS/VSC/TRC > Data List
Tester Display
Parking Brake SW
50003 105 38

e.

Using the GTS, check that the switch condition displayed on the GTS changes according to the parking brake operation.

OK:

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



Result:
Proceed to
OK
NG



OK

7.INSPECT BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY

NG

10.INSPECT PARKING BRAKE SWITCH ASSEMBLY
7.INSPECT BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY
a.
C230719C04
1.99,1.979 2.458,2.771 false 1.479,1.979 1.021,2.771 false 0.365,0.302 0.594,0.49 0.229,0.188 10 *a 2.427,2.792 2.583,2.979 0.156,0.188 10 + 0.896,2.792 1.052,2.979 0.156,0.188 10 E
*a Component without harness connected
(Brake Fluid Level Warning Switch (Brake Master Cylinder Reservoir Assembly))


Turn the ignition switch off.


b.

Remove the reservoir filler cap and strainer.


c.

Disconnect the A8 brake fluid level warning switch (brake master cylinder reservoir assembly) connector.


d.

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 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


HINT:

If the switch condition is normal, adjust the brake fluid level to the MAX level.



Result:
Proceed to
OK
NG



OK

8.CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY)

NG

REPLACE BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY

Click hereBrake>BRAKE SYSTEM (OTHER)>BRAKE MASTER CYLINDER>DISASSEMBLY


8.CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY)
a.

Disconnect the E43 combination meter assembly connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
E43-12 (SW) - A8-1 (+) Always Below 1 Ω
E43-12 (SW) or A8-1 (+) - Body ground Always 10 kΩ or higher
A8-2 (E) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

9.READ VALUE USING GTS (BRAKE WARNING LIGHT)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.READ VALUE USING GTS (BRAKE WARNING LIGHT)
a.

Reconnect the A8 brake fluid level warning switch (brake master cylinder reservoir assembly) connector.


b.

Reconnect the E43 combination meter assembly connector.


c.

Select the Data List on the GTS.

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>DATA LIST / ACTIVE TEST

Chassis > ABS/VSC/TRC > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Brake Warning Light Brake warning light ON or OFF ON: Warning light on
OFF: Warning light off 		-
Chassis > ABS/VSC/TRC > Data List
Tester Display
Brake Warning Light
50003 105 52

d.

Check the GTS display condition of the brake warning light.

Result:
Result Proceed to
Display of the Data List remains ON. A
Display of the Data List remains OFF. B


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.

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>PROBLEM SYMPTOMS TABLE




A

REPLACE BRAKE ACTUATOR ASSEMBLY

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>BRAKE ACTUATOR>REMOVAL


B

INSPECT METER / GAUGE SYSTEM

Click hereVehicle Interior>METER / GAUGE / DISPLAY>METER / GAUGE SYSTEM>HOW TO PROCEED WITH TROUBLESHOOTING


10.INSPECT PARKING BRAKE SWITCH ASSEMBLY
a.
C211519C04
1.625,1.948 0.844,2.802 false 0.375,0.292 0.542,0.458 0.167,0.167 10 *a 0.75,2.802 0.875,2.969 0.125,0.167 10 +
*a Component without harness connected
(Parking Brake Switch Assembly)


Turn the ignition switch off.


b.

Disconnect the L17 parking brake switch assembly connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
1 (+) - Body ground Switch ON
(Switch pin free) 		Below 1 Ω
1 (+) - Body ground Switch OFF
(Switch pin pushed in) 		10 kΩ or higher



Result:
Proceed to
OK
NG



OK

11.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - PARKING BRAKE SWITCH ASSEMBLY)

NG

REPLACE PARKING BRAKE SWITCH ASSEMBLY

Click hereBrake>PARKING BRAKE>PARKING BRAKE SWITCH>REMOVAL


11.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - PARKING BRAKE SWITCH ASSEMBLY)
a.

Disconnect the 3E main body ECU (multiplex network body ECU) connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
3E-30 (PKB) - L17-1 (+) Always Below 1 Ω
3E-30 (PKB) or L17-1 (+) - 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.

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>PROBLEM SYMPTOMS TABLE



Result:
Proceed to
OK
NG



OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR