BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS  VEHICLE STABILITY CONTROL SYSTEM  ABS 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 ABS warning light remains on:

·

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

·

There is a malfunction in the skid control ECU (brake actuator assembly) internal circuit.

·

There is an open in the harness between the combination meter assembly and the skid control ECU (brake actuator assembly).

·

The ABS is defective.


HINT:

In some cases, the GTS cannot be used when the skid control ECU (brake actuator assembly) is abnormal.


WIRING DIAGRAM

C274777E96
0.865,1.25 1.271,1.448 0.406,0.198 10 false CANL 0.865,2.292 1.271,2.49 0.406,0.198 10 false CANH 1.333,2.135 1.552,2.313 0.219,0.177 10 false 32 1.333,1.083 1.552,1.26 0.219,0.177 10 false 31 0.292,5.875 0.781,6.104 0.49,0.229 10 false E43 0.281,6.042 1.479,6.396 1.198,0.354 10 false Combination Meter Assembly 2.792,6.396 4.552,6.573 1.76,0.177 10 false : CAN Communication Line 5.583,5.802 6.01,6.01 0.427,0.208 10 false A64 5.583,5.969 7.156,6.333 1.573,0.365 10 false Skid Control ECU (Brake Actuator Assembly) 5.833,1.083 6.052,1.26 0.219,0.177 10 false 14 6.104,1.25 6.552,1.438 0.448,0.188 10 false CANL 6.104,2.313 6.552,2.5 0.448,0.188 10 false CANH 6.104,3.333 6.552,3.521 0.448,0.188 10 false IG1 6.104,4.385 6.552,4.573 0.448,0.188 10 false GND1 5.833,2.125 6.052,2.302 0.219,0.177 10 false 25 5.833,3.229 6.052,3.406 0.219,0.177 10 false 34 5.917,4.281 6.052,4.469 0.135,0.188 10 false 1 1.958,3.333 3.354,3.531 1.396,0.198 10 false from IG1 NO. 1 Relay 4.25,3.5 5.177,3.688 0.927,0.188 10 false ECU-IG NO. 1 4.427,3.219 4.583,3.417 0.156,0.198 10 false 1 4.823,3.219 4.979,3.417 0.156,0.198 10 false 2

CAUTION / NOTICE / HINT

NOTICE:
·

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration.

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>VEHICLE STABILITY CONTROL SYSTEM>CALIBRATION

·

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

·

Before performing this procedure, depress the brake pedal and confirm that the stop lights illuminate.



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 OR BATTERY

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


4.CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)
a.
C318307C06
0.115,0.958 0.51,1.219 0.396,0.26 0.844,1.875 1.125,1.021 true 2.438,1.896 2.302,1.302 true 0.177,0.167 0.49,0.323 0.313,0.156 10 false *a 0.656,1.896 1.146,2.146 0.49,0.25 10 false GND1 0.188,1.01 0.677,1.26 0.49,0.25 10 false A64 2.365,1.917 2.854,2.167 0.49,0.25 10 false IG1
*a Front view of wire harness connector
(to Skid Control ECU (Brake Actuator Assembly))


Disconnect the A64 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
A64-34 (IG1) - Body ground Engine switch on (IG) 11 to 14 V
A64-34 (IG1) - A64-1 (GND1) Engine switch on (IG) 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.
C318307C07
0.115,0.958 0.51,1.219 0.396,0.26 0.875,1.875 1.156,1.021 true 0.177,0.167 0.49,0.323 0.313,0.156 10 false *a 0.656,1.896 1.146,2.146 0.49,0.25 10 false GND1 0.188,1.01 0.677,1.26 0.49,0.25 10 false A64
*a Front view of wire harness connector
(to Skid Control ECU (Brake Actuator Assembly))


Turn the engine switch off.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
A64-1 (GND1) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

6.READ VALUE USING GTS (ABS WARNING LIGHT)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT)

6.READ VALUE USING GTS (ABS WARNING LIGHT)
a.

Reconnect the A64 skid control ECU (brake actuator assembly) connector.


b.

Connect the GTS to the DLC3.


c.

Turn the engine switch on (IG).


d.

Select the Data List on the GTS.

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>VEHICLE STABILITY CONTROL SYSTEM>DATA LIST / ACTIVE TEST

Chassis > ABS/VSC/TRC > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
ABS Warning Light ABS warning light ON or OFF ON: Warning light on
OFF: Warning light off 		-
Chassis > ABS/VSC/TRC > Data List
Tester Display
ABS Warning Light
50003 105 51

e.

Check the GTS display condition of the ABS warning light.

Result:
Result Proceed to
ON is displayed. A
OFF is displayed. 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>VEHICLE STABILITY CONTROL 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