NO.2 ABS WARNING LIGHT REMAINS ILLUMINATED [ANTILOCK BRAKE SYSTEM (ABS)]

2	ABS warning light remains illuminated
POSSIBLE CAUSE	• 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 displayed.) • ABS HU/CM does not operate. • PCM detected malfunction. • Error signal input from PCM • Communication error between ABS HU/CM and instrument cluster • Communication error between ABS HU/CM and PCM • Communication error between ABS HU/CM and EPS CM • After replacing SAS control module the low-G sensor and yaw rate sensor initialization have not been performed. • Non-completion of module configuration (When module configuration is not performed after replacing ABS HU/CM, ABS warning light remains illuminated.) • ABS HU/CM internal malfunction

ABS warning light remains illuminated

POSSIBLE CAUSE

• 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 displayed.)

• ABS HU/CM does not operate.

• PCM detected malfunction.

• Error signal input from PCM

• Communication error between ABS HU/CM and instrument cluster

• Communication error between ABS HU/CM and PCM

• Communication error between ABS HU/CM and EPS CM

• After replacing SAS control module the low-G sensor and yaw rate sensor initialization have not been performed.

• Non-completion of module configuration (When module configuration is not performed after replacing ABS HU/CM, ABS warning light remains illuminated.)

• ABS HU/CM internal malfunction

STEP	INSPECTION	ACTION
1	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 6.
2	INSPECT CONNECTION OF ABS HU/CM CONNECTOR • Inspect 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 Step 6.
3	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 a short to ground. Repair or replace the wiring harness for a possible short to ground if necessary. Install appropriate amperage fuse.
^*4	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.
^*5	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 at the ground point.
6	CONFIRM PCM DTCs • Retrieve the PCM DTCs using the M-MDS (IDS). (See ON-BOARD DIAGNOSTIC TEST [MZR 1.6].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZR 1.6].)
No	Go to the next step.
7	VERIFY IF MALFUNCTION CAUSED BY INITIALIZATION PROCEDURE FOR LOW-G SENSOR NOT PERFORMED • Verify if the malfunction is caused by the initialization procedure for the low-G sensor not being performed. • Has the initial setting for the low-G sensor been performed after replacing the ABS HU/CM and the SAS control module?	Yes	Go to the next step.
No	Perform the low-G sensor initial setting. (See ABS RELATED PARTS SENSOR INITIALIZATION PROCEDURE.)
8	VERIFY IF MALFUNCTION CAUSED BY INITIALIZATION PROCEDURE FOR YAW RATE SENSOR NOT PERFORMED • Verify if the malfunction is caused by the initialization procedure for the yaw rate sensor not being performed. • Has the initial setting for the yaw rate sensor been performed after replacing the ABS HU/CM and the SAS control module?	Yes	Go to the next step.
No	Perform the yaw rate sensor initial setting. (See ABS RELATED PARTS SENSOR INITIALIZATION PROCEDURE.)
9	VERIFY IF MALFUNCTION IS IN INSTRUMENT CLUSTER OR ABS HU/CM • 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 the 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	Replace the ABS HU/CM. (Internal malfunction) (See ABS HU/CM REMOVAL/INSTALLATION.)
No	Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)

STEP

INSPECTION

ACTION

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 6.

INSPECT CONNECTION OF ABS HU/CM CONNECTOR

• Inspect 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 Step 6.

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 a short to ground.

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

Install appropriate amperage fuse.

^*4

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.

^*5

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 at the ground point.

CONFIRM PCM DTCs

• Retrieve the PCM DTCs using the M-MDS (IDS).

(See ON-BOARD DIAGNOSTIC TEST [MZR 1.6].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [MZR 1.6].)

Go to the next step.

VERIFY IF MALFUNCTION CAUSED BY INITIALIZATION PROCEDURE FOR LOW-G SENSOR NOT PERFORMED

• Verify if the malfunction is caused by the initialization procedure for the low-G sensor not being performed.

• Has the initial setting for the low-G sensor been performed after replacing the ABS HU/CM and the SAS control module?

Yes

Go to the next step.

Perform the low-G sensor initial setting.

VERIFY IF MALFUNCTION CAUSED BY INITIALIZATION PROCEDURE FOR YAW RATE SENSOR NOT PERFORMED

• Verify if the malfunction is caused by the initialization procedure for the yaw rate sensor not being performed.

• Has the initial setting for the yaw rate sensor been performed after replacing the ABS HU/CM and the SAS control module?

Yes

Go to the next step.

Perform the yaw rate sensor initial setting.

VERIFY IF MALFUNCTION IS IN INSTRUMENT CLUSTER OR ABS HU/CM

• 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 the 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

Replace the ABS HU/CM. (Internal malfunction)

(See ABS HU/CM REMOVAL/INSTALLATION.)

Replace the instrument cluster.

(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)

• 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.