Toyota CH-R Service Manual: ABS Warning Light Remains ON

Toyota CH-R Service Manual / 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 and skid control ECU (brake actuator assembly).
The ABS is defective.

HINT:

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

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (brake actuator assembly), perform system variant learning.
Click here
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 here

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

INSPECT CAN COMMUNICATION SYSTEM

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.

CONNECT CONNECTOR TO ECU CORRECTLY

3.	CHECK BATTERY

(a) Check the battery voltage.

Standard Voltage:

11 to 14 V

CHECK OR REPLACE CHARGING SYSTEM COMPONENT OR BATTERY

4.	CHECK HARNESS AND CONNECTOR (POWER SOURCE (IG1) TERMINAL)

(a) Disconnect the A42 skid control ECU (brake actuator assembly) connector.

*a	Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A42-30 (+BS) - Body ground	Always	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE TERMINAL)

5.	CHECK HARNESS AND CONNECTOR (POWER SOURCE (IG1) TERMINAL)

(a) Disconnect the A42 skid control ECU (brake actuator assembly) connector.

*a	Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A42-36 (IG1) - Body ground	Ignition switch ON	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE TERMINAL)

6.	CHECK HARNESS AND CONNECTOR (GND1 TERMINAL)

(a) Turn the ignition switch off.

*a	Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A42-46 (GND1) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT)

7.	READ VALUE USING TECHSTREAM (ABS WARNING LIGHT)

(a) Reconnect the A42 skid control ECU (brake actuator assembly) connector.

(b) Select the Data List on the Techstream.

Click here

Chassis > ABS/VSC/TRAC/EPB > 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	-

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/TRAC/EPB > Data List

Tester Display
ABS Warning Light

Result	Proceed to
ON is displayed.	A
OFF is displayed.	B

REPLACE BRAKE ACTUATOR ASSEMBLY

INSPECT METER / GAUGE SYSTEM

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