ABS Warning Light Remains ON

DESCRIPTION

The skid control ECU is connected to the combination meter via CAN and multiplex communications.
If any of the following is detected, the ABS warning light remains on.

1. The skid control ECU connectors are disconnected from the skid control ECU.
   
2. There is a malfunction in the skid control ECU internal circuit.
   
3. There is an open in the harness between the combination meter and the skid control ECU.
   

HINT:

In some cases, the intelligent tester cannot be used when the skid control ECU is abnormal.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

When replacing the brake actuator assembly, perform zero point calibration (Click here).

1. CHECK CAN COMMUNICATION SYSTEM

1. Check if the CAN communication system DTC is output (Click here for LHD, or Click here for RHD).
   

   Result:

   Condition	Proceed to
   DTC is not output	A
   DTC is output	B

B	INSPECT CAN COMMUNICATION SYSTEM

A

2. CHECK MULTIPLEX COMMUNICATION SYSTEM

1. Check if the multiplex communication system DTC is output (Click here).
   

   Result:

   Condition	Proceed to
   DTC is not output	A
   DTC is output	B

B	INSPECT MULTIPLEX COMMUNICATION SYSTEM

A

3. CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED

1. Check if the skid control ECU connector is securely connected.

   OK:

   The connector should be securely connected.
   

NG	CONNECT CONNECTOR TO ECU CORRECTLY

OK

4. CHECK BATTERY

1. Check the battery voltage.

   Standard voltage:

   11 to 14 V
   

NG	CHECK AND REPLACE CHARGING SYSTEM OR BATTERY

OK

5. INSPECT SKID CONTROL ECU (IG1 TERMINAL)

1. Disconnect the skid control ECU connector.

2. Turn the engine switch on (IG).

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

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   A14-46 (IG1) - Body ground	Engine switch on (IG)	10 to 14 V

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)

OK

6. INSPECT SKID CONTROL ECU (GND TERMINAL)

1. Turn the engine switch off.

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

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   A14-32 (GND1) - Body ground	Always	Below 1 Ω
   A14-1 (GND2) - Body ground	Always	Below 1 Ω

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

OK

7. INSPECT COMBINATION METER ASSEMBLY

1. Reconnect the skid control ECU connector.

2. Perform Active Test of the combination meter (meter CPU) using the intelligent tester (Click here).

   OK:

   The ABS warning light turns on or off in accordance with the intelligent tester.
   

   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 (Click here).

NG	REPLACE COMBINATION METER ASSEMBLY

OK
REPLACE BRAKE ACTUATOR ASSEMBLY