NO.3 BRAKE SYSTEM WARNING LIGHT REMAINS ILLUMINATED [ANTILOCK BRAKE SYSTEM (ABS)]

3	Brake system warning light remains illuminated
POSSIBLE CAUSE	• Brake fluid amount is low. • Parking brake does not release. • Parking brake switch or brake fluid level sensor stuck on. • Short to ground in following circuit: ― Between parking brake switch and instrument cluster ― Between brake fluid level sensor and front body control module (FBCM) • No connection at ABS HU/CM connector (When ABS HU/CM connector is removed, ABS warning light and brake system warning light are illuminated.) • ABS HU/CM detected malfunction. (Input and output device malfunction) • ABS HU/CM detects low voltage in power supply. • ABS HU/CM ground malfunction (When ABS HU/CM ground is not securely connected, ABS warning light and brake system warning light are illuminated but DTCs are not display.) • ABS HU/CM does not operate. • Front body control module (FBCM) detected malfunction. • ABS HU/CM internal malfunction • Instrument cluster detected malfunction

Brake system warning light remains illuminated

POSSIBLE CAUSE

• Brake fluid amount is low.

• Parking brake does not release.

• Parking brake switch or brake fluid level sensor stuck on.

• Short to ground in following circuit:

― Between parking brake switch and instrument cluster

― Between brake fluid level sensor and front body control module (FBCM)

• No connection at ABS HU/CM connector (When ABS HU/CM connector is removed, ABS warning light and brake system warning light are illuminated.)

• ABS HU/CM detected malfunction. (Input and output device malfunction)

• ABS HU/CM detects low voltage in power supply.

• ABS HU/CM ground malfunction (When ABS HU/CM ground is not securely connected, ABS warning light and brake system warning light are illuminated but DTCs are not display.)

• ABS HU/CM does not operate.

• Front body control module (FBCM) detected malfunction.

• ABS HU/CM internal malfunction

• Instrument cluster detected malfunction

STEP	INSPECTION	ACTION
1	INSPECT BRAKE FLUID AMOUNT AND VERIFY THAT PARKING BRAKE IS RELEASED • Inspect the brake fluid amount and verify that the parking brake is released. • Is the brake fluid amount normal? • Is the parking brake lever released?	Yes	Go to the next step.
No	Add the brake fluid or release the parking brake lever. If the brake fluid amount is less than specification: • Inspect and repair the brake line for leakage.
2	CONFIRM ABS HU/CM DTC • Retrieve the ABS HU/CM DTC using the M-MDS (IDS). (See ON-BOARD DIAGNOSIS [ANTILOCK BRAKE SYSTEM (ABS)].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSIS [ANTILOCK BRAKE SYSTEM (ABS)].)
No	If a communication error message is displayed on the M-MDS (IDS) screen: • Go to the next step. If a communication error message is not displayed: • Go to Step 4.
3	INSPECT CONNECTION OF ABS HU/CM CONNECTOR • Inspect the connection of the ABS HU/CM connector. • Is the ABS HU/CM connector connected securely?	Yes	Go to the next step.
No	Connect the ABS HU/CM connector securely, then go to the next step.
4	CONFIRM INSTRUMENT CLUSTER OPERATION RECORD • Retrieve the warning system operation history using the M-MDS (IDS). (See INSTRUMENT CLUSTER OPERATION RECORD.) • Is the brake system warning light illumination history recorded?	Yes	If the Brake Warning Lamp is recorded: • Go to Step 5. If the Brake Warning Lamp (Brake fluid low) is recorded: • Go to Step 6. If the Brake Warning Lamp (Parking Brake ON over 20 km/h or 12.4 mile/h) is recorded: • Go to Step 8.
No	Go to Step 10.
5	VERIFY IF MALFUNCTION IS IN INSTRUMENT CLUSTER OR ELSEWHERE • Connect the M-MDS (IDS) to the DLC-2. • Turn off and on all warning lights and indicator lights using the instrument cluster PID WL+IL of active command modes. (See ACTIVE COMMAND MODES INSPECTION [INSTRUMENT CLUSTER].) • Do the ABS warning light and brake system warning light turn on and off according to the active command modes?	Yes	Go to Step 10.
No	Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
6	VERIFY IF MALFUNCTION IS IN BRAKE FLUID LEVEL SENSOR OR ELSEWHERE • Inspect the brake fluid level sensor for continuity. (See BRAKE FLUID LEVEL SENSOR INSPECTION.) • Is the continuity condition normal?	Yes	Go to the next step.
No	Replace the malfunctioning part. (See MASTER CYLINDER REMOVAL/INSTALLATION [L.H.D.].) (See MASTER CYLINDER REMOVAL/INSTALLATION [R.H.D.].)
^*7	INSPECT FOR SHORT TO GROUND IN WIRING HARNESS BETWEEN FRONT BODY CONTROL MODULE (FBCM) AND BRAKE FLUID LEVEL SENSOR • Inspect for short to ground in the following circuit: ― Between brake fluid level sensor and front body control module (FBCM) terminal 2Q • Is a short to ground detected?	Yes	Repair or replace the wiring harness for a possible short to ground.
No	Retrieve the front body control module (FBCM) DTC using the M-MDS (IDS). (See DTC INSPECTION [FRONT BODY CONTROL MODULE (FBCM)].) If the DTC remains: • Go to the applicable DTC inspection. (See DTC TABLE [FRONT BODY CONTROL MODULE (FBCM)].) If the DTC does not remain: • Replace the front body control module (FBCM). (See FRONT BODY CONTROL MODULE (FBCM) REMOVAL/INSTALLATION.)
8	INSPECT WHETHER MALFUNCTION IS IN PARKING BRAKE SWITCH OR ELSEWHERE • Inspect the following parts for continuity: ― Parking brake switch (See PARKING BRAKE SWITCH INSPECTION.) • Is the continuity condition normal?	Yes	Go to the next step.
No	Replace the malfunctioning part. (See PARKING BRAKE LEVER REMOVAL/INSTALLATION.)
^*9	INSPECT FOR SHORT TO GROUND IN WIRING HARNESS BETWEEN INSTRUMENT CLUSTER AND PARKING BRAKE SWITCH • Inspect for short to ground in the following circuit: ― Between parking brake switch and instrument cluster terminal X • Is the short to ground detected?	Yes	Repair or replace the wiring harness for a possible short to ground.
No	Retrieve the instrument cluster DTC using the M-MDS (IDS). (See DTC INSPECTION [INSTRUMENT CLUSTER].) If the DTC remains: • Go to the applicable DTC inspection. (See DTC TABLE [INSTRUMENT CLUSTER].) If the DTC does not remain: • Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
10	INSPECT ABS HU/CM POWER SUPPLY FUSE • Inspect the ABS HU/CM ignition power supply fuse. • Is the fuse normal?	Yes	Go to the next step.
No	Inspect the blown fuse’s circuit for short to ground. Repair or replace the wiring harness for a possible short to ground as necessary. Install appropriate amperage fuse.
^*11	VERIFY IF MALFUNCTION IS IN WIRING HARNESS (BETWEEN ABS HU/CM POWER SUPPLY AND ABS HU/CM FOR CONTINUITY) OR ELSEWHERE • Switch the ignition ON. • Measure the voltage at the ABS HU/CM terminal N (wiring harness-side). • Is the voltage approx. 12 V?	Yes	Go to the next step.
No	Refer to the wiring diagram and verify whether or not there is a common connector between ABS HU/CM terminal N (wiring harness-side) and ignition switch. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit.
^*12	VERIFY IF MALFUNCTION IS IN WIRING HARNESS (BETWEEN ABS HU/CM AND GROUND FOR CONTINUITY) OR ELSEWHERE • Switch the ignition off. • Disconnect the ABS HU/CM connector. • Inspect for continuity between ABS HU/CM terminal B (wiring harness-side) and body ground. • Is there continuity?	Yes	Replace the ABS HU/CM. (open circuit in the ABS HU/CM) (See ABS HU/CM REMOVAL/INSTALLATION.)
No	Repair or replace the wiring harness for a possible open circuit and poor contact in ground point.

STEP

INSPECTION

ACTION

INSPECT BRAKE FLUID AMOUNT AND VERIFY THAT PARKING BRAKE IS RELEASED

• Inspect the brake fluid amount and verify that the parking brake is released.

• Is the brake fluid amount normal?

• Is the parking brake lever released?

Yes

Go to the next step.

Add the brake fluid or release the parking brake lever.

If the brake fluid amount is less than specification:

• Inspect and repair the brake line for leakage.

CONFIRM ABS HU/CM DTC

• Retrieve the ABS HU/CM DTC using the M-MDS (IDS).

(See ON-BOARD DIAGNOSIS [ANTILOCK BRAKE SYSTEM (ABS)].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See ON-BOARD DIAGNOSIS [ANTILOCK BRAKE SYSTEM (ABS)].)

If a communication error message is displayed on the M-MDS (IDS) screen:

• Go to the next step.

If a communication error message is not displayed:

• Go to Step 4.

INSPECT CONNECTION OF ABS HU/CM CONNECTOR

• Inspect the connection of the ABS HU/CM connector.

• Is the ABS HU/CM connector connected securely?

Yes

Go to the next step.

Connect the ABS HU/CM connector securely, then go to the next step.

CONFIRM INSTRUMENT CLUSTER OPERATION RECORD

• Retrieve the warning system operation history using the M-MDS (IDS).

(See INSTRUMENT CLUSTER OPERATION RECORD.)

• Is the brake system warning light illumination history recorded?

Yes

If the Brake Warning Lamp is recorded:

• Go to Step 5.

If the Brake Warning Lamp (Brake fluid low) is recorded:

• Go to Step 6.

If the Brake Warning Lamp (Parking Brake ON over 20 km/h or 12.4 mile/h) is recorded:

• Go to Step 8.

Go to Step 10.

VERIFY IF MALFUNCTION IS IN INSTRUMENT CLUSTER OR ELSEWHERE

• Connect the M-MDS (IDS) to the DLC-2.

• Turn off and on all warning lights and indicator lights using the instrument cluster PID WL+IL of active command modes.

(See ACTIVE COMMAND MODES INSPECTION [INSTRUMENT CLUSTER].)

• Do the ABS warning light and brake system warning light turn on and off according to the active command modes?

Yes

Go to Step 10.

Replace the instrument cluster.

(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)

VERIFY IF MALFUNCTION IS IN BRAKE FLUID LEVEL SENSOR OR ELSEWHERE

• Inspect the brake fluid level sensor for continuity.

(See BRAKE FLUID LEVEL SENSOR INSPECTION.)

• Is the continuity condition normal?

Yes

Go to the next step.

Replace the malfunctioning part.

(See MASTER CYLINDER REMOVAL/INSTALLATION [L.H.D.].)

(See MASTER CYLINDER REMOVAL/INSTALLATION [R.H.D.].)

^*7

INSPECT FOR SHORT TO GROUND IN WIRING HARNESS BETWEEN FRONT BODY CONTROL MODULE (FBCM) AND BRAKE FLUID LEVEL SENSOR

• Inspect for short to ground in the following circuit:

― Between brake fluid level sensor and front body control module (FBCM) terminal 2Q

• Is a short to ground detected?

Yes

Repair or replace the wiring harness for a possible short to ground.

Retrieve the front body control module (FBCM) DTC using the M-MDS (IDS).

(See DTC INSPECTION [FRONT BODY CONTROL MODULE (FBCM)].)

If the DTC remains:

• Go to the applicable DTC inspection.

(See DTC TABLE [FRONT BODY CONTROL MODULE (FBCM)].)

If the DTC does not remain:

• Replace the front body control module (FBCM).

(See FRONT BODY CONTROL MODULE (FBCM) REMOVAL/INSTALLATION.)

INSPECT WHETHER MALFUNCTION IS IN PARKING BRAKE SWITCH OR ELSEWHERE

• Inspect the following parts for continuity:

― Parking brake switch

(See PARKING BRAKE SWITCH INSPECTION.)

• Is the continuity condition normal?

Yes

Go to the next step.

Replace the malfunctioning part.

(See PARKING BRAKE LEVER REMOVAL/INSTALLATION.)

^*9

INSPECT FOR SHORT TO GROUND IN WIRING HARNESS BETWEEN INSTRUMENT CLUSTER AND PARKING BRAKE SWITCH

• Inspect for short to ground in the following circuit:

― Between parking brake switch and instrument cluster terminal X

• Is the short to ground detected?

Yes

Repair or replace the wiring harness for a possible short to ground.

Retrieve the instrument cluster DTC using the M-MDS (IDS).

(See DTC INSPECTION [INSTRUMENT CLUSTER].)

If the DTC remains:

• Go to the applicable DTC inspection.

(See DTC TABLE [INSTRUMENT CLUSTER].)

If the DTC does not remain:

• Replace the instrument cluster.

(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)

INSPECT ABS HU/CM POWER SUPPLY FUSE

• Inspect the ABS HU/CM ignition power supply fuse.

• Is the fuse normal?

Yes

Go to the next step.

Inspect the blown fuse’s circuit for short to ground.

Repair or replace the wiring harness for a possible short to ground as necessary.

Install appropriate amperage fuse.

^*11

VERIFY IF MALFUNCTION IS IN WIRING HARNESS (BETWEEN ABS HU/CM POWER SUPPLY AND ABS HU/CM FOR CONTINUITY) OR ELSEWHERE

• Switch the ignition ON.

• Measure the voltage at the ABS HU/CM terminal N (wiring harness-side).

• Is the voltage approx. 12 V?

Yes

Go to the next step.

Refer to the wiring diagram and verify whether or not there is a common connector between ABS HU/CM terminal N (wiring harness-side) and ignition switch.

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has an open circuit.

^*12

VERIFY IF MALFUNCTION IS IN WIRING HARNESS (BETWEEN ABS HU/CM AND GROUND FOR CONTINUITY) OR ELSEWHERE

• Switch the ignition off.

• Disconnect the ABS HU/CM connector.

• Inspect for continuity between ABS HU/CM terminal B (wiring harness-side) and body ground.

• Is there continuity?

Yes

Replace the ABS HU/CM. (open circuit in the ABS HU/CM)

(See ABS HU/CM REMOVAL/INSTALLATION.)

Repair or replace the wiring harness for a possible open circuit and poor contact in ground point.

• When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while doing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, verify that connectors, terminals and wiring harnesses are connected correctly and undamaged.