NO.4 BOTH ABS WARNING LIGHT AND BRAKE SYSTEM WARNING LIGHT STAY ON 4 S OR MORE WITH SWITCH THE IGNITION TO ON [ABS]

4	Both ABS warning light and brake system warning light stay on 4 s or more with switch the ignition to ON
Possible cause	• ABS HU/CM power supply fuse malfunction • Short to ground in ABS HU/CM power supply circuit • Communication network malfunction • ABS CM internal malfunction • Instrument cluster malfunction • ABS HU/CM connector is not connected securely • Battery malfunction • Charging system malfunction • Open circuit in ABS HU/CM ground circuit • ABS HU/CM power supply circuit malfunction (ABS HU/CM ignition terminal N voltage is below about 8 V)

Both ABS warning light and brake system warning light stay on 4 s or more with switch the ignition to ON

Possible cause

• ABS HU/CM power supply fuse malfunction

• Short to ground in ABS HU/CM power supply circuit

• Communication network malfunction

• ABS CM internal malfunction

• Instrument cluster malfunction

• ABS HU/CM connector is not connected securely

• Battery malfunction

• Charging system malfunction

• Open circuit in ABS HU/CM ground circuit

• ABS HU/CM power supply circuit malfunction (ABS HU/CM ignition terminal N voltage is below about 8 V)

STEP	INSPECTION	ACTION
1	INSPECT ABS HU/CM POWER SUPPLY FUSE • Switch the ignition to off. • Disconnect the negative battery cable. • Inspect the ABS HU/CM ignition power supply fuse. • Is the fuse normal?	Yes	Go to the next step.
No	Inspect for short to ground in power supply circuit. Repair or replace if necessary. Install appropriate amperage fuse.
2	INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR OPEN CIRCUIT AND SHORT CIRCUIT • Reconnect the negative battery cable. • Retrieve the ABS HU/CM DTC using the M-MDS. (See ON-BOARD DIAGNOSIS [ABS].) • Is any error message displayed regarding communication between ABS HU/CM and M-MDS?	Yes	If the communication error message is displayed even after inspecting according to the procedure displayed on the M-MDS: • Go to Step 6.
No	Go to the next step.
3	CONFIRM INSTRUMENT CLUSTER DTC • Retrieve the instrument cluster DTC using the M-MDS. (See DTC INSPECTION [INSTRUMENT CLUSTER].) • Is the DTC U0415:92 present?	Yes	Go to the next step.
No	Go to Step 6.
^*4	INSPECT ABS HU/CM POWER SUPPLY VOLTAGE • Access the VPWR PID using the M-MDS. (See ON-BOARD DIAGNOSIS [ABS].) • Is the VPWR PID value above 10 V?	Yes	Replace the ABS CM (ABS CM internal malfunction). (See ABS HU/CM REMOVAL/INSTALLATION.)
No	Go to the next step.
5	INSPECT WHETHER MALFUNCTION IS IN INSTRUMENT CLUSTER OR ELSEWHERE • Release the parking brake. • Turn on all the warning light and indicator light using the M-MDS simulation function WL+IL. (See ACTIVE COMMAND MODES INSPECTION [INSTRUMENT CLUSTER].) • Does the ABS warning light turn off?	Yes	Go to the next step.
No	Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
6	INSPECT FOR CONNECTION OF ABS HU/CM CONNECTOR • Inspect for connection of ABS HU/CM connector. • Is the ABS HU/CM connector connected securely?	Yes	Go to Step 8.
No	Reconnect the ABS HU/CM connector securely, then go to the next step.
7	VERIFY ABS WARNING LIGHT OPERATION • Switch the ignition to off, then to ON. • Does the ABS warning light turn off 4 s after the ignition is switched to ON.	Yes	Symptom troubleshooting is completed (ABS HU/CM connector is not connected securely).
No	Go to the next step.
8	INSPECT BATTERY • Measure the battery voltage. (See BATTERY INSPECTION [MZR 1.5, MZR 1.6].) (See BATTERY INSPECTION [MZR 2.0, MZR 2.5].) • Is the battery voltage normal?	Yes	Go to the next step.
No	Inspect the battery and charging system. (See BATTERY INSPECTION [MZR 1.5, MZR 1.6].) (See BATTERY INSPECTION [MZR 2.0, MZR 2.5].) (See GENERATOR INSPECTION [MZR 1.5, MZR 1.6].) (See GENERATOR INSPECTION [MZR 2.0, MZR 2.5].) Repair or replace the malfunctioning part according to the inspection results.
9	INSPECT BATTERY VOLTAGE WHILE ELECTRICAL LOAD IS OPERATING • Inspect the battery voltage while electrical load (A/C, headlight etc.) is operating. (See BATTERY INSPECTION [MZR 1.5, MZR 1.6].) (See BATTERY INSPECTION [MZR 2.0, MZR 2.5].) • Is the battery voltage normal?	Yes	Inspect the wiring harness in ABS HU/CM terminal N and terminal B related circuit. Repair or replace the suspected wiring harness if necessary.
No	Inspect the charging system (such as drive belt tension and generator). (See GENERATOR INSPECTION [MZR 1.5, MZR 1.6].) (See GENERATOR INSPECTION [MZR 2.0, MZR 2.5].) Repair or replace the malfunctioning part according to the inspection results.

STEP

INSPECTION

ACTION

INSPECT ABS HU/CM POWER SUPPLY FUSE

• Switch the ignition to off.

• Disconnect the negative battery cable.

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

• Is the fuse normal?

Yes

Go to the next step.

Inspect for short to ground in power supply circuit.

Repair or replace if necessary.

Install appropriate amperage fuse.

INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR OPEN CIRCUIT AND SHORT CIRCUIT

• Reconnect the negative battery cable.

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

(See ON-BOARD DIAGNOSIS [ABS].)

• Is any error message displayed regarding communication between ABS HU/CM and M-MDS?

Yes

If the communication error message is displayed even after inspecting according to the procedure displayed on the M-MDS:

• Go to Step 6.

Go to the next step.

CONFIRM INSTRUMENT CLUSTER DTC

• Retrieve the instrument cluster DTC using the M-MDS.

(See DTC INSPECTION [INSTRUMENT CLUSTER].)

• Is the DTC U0415:92 present?

Yes

Go to the next step.

Go to Step 6.

^*4

INSPECT ABS HU/CM POWER SUPPLY VOLTAGE

• Access the VPWR PID using the M-MDS.

(See ON-BOARD DIAGNOSIS [ABS].)

• Is the VPWR PID value above 10 V?

Yes

Replace the ABS CM (ABS CM internal malfunction).

(See ABS HU/CM REMOVAL/INSTALLATION.)

Go to the next step.

INSPECT WHETHER MALFUNCTION IS IN INSTRUMENT CLUSTER OR ELSEWHERE

• Release the parking brake.

• Turn on all the warning light and indicator light using the M-MDS simulation function WL+IL.

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

• Does the ABS warning light turn off?

Yes

Go to the next step.

Replace the instrument cluster.

(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)

INSPECT FOR CONNECTION OF ABS HU/CM CONNECTOR

• Inspect for connection of ABS HU/CM connector.

• Is the ABS HU/CM connector connected securely?

Yes

Go to Step 8.

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

VERIFY ABS WARNING LIGHT OPERATION

• Switch the ignition to off, then to ON.

• Does the ABS warning light turn off 4 s after the ignition is switched to ON.

Yes

Symptom troubleshooting is completed (ABS HU/CM connector is not connected securely).

Go to the next step.

INSPECT BATTERY

• Measure the battery voltage.

(See BATTERY INSPECTION [MZR 1.5, MZR 1.6].)

(See BATTERY INSPECTION [MZR 2.0, MZR 2.5].)

• Is the battery voltage normal?

Yes

Go to the next step.

Inspect the battery and charging system.

(See BATTERY INSPECTION [MZR 1.5, MZR 1.6].)

(See BATTERY INSPECTION [MZR 2.0, MZR 2.5].)

(See GENERATOR INSPECTION [MZR 1.5, MZR 1.6].)

(See GENERATOR INSPECTION [MZR 2.0, MZR 2.5].)

Repair or replace the malfunctioning part according to the inspection results.

INSPECT BATTERY VOLTAGE WHILE ELECTRICAL LOAD IS OPERATING

• Inspect the battery voltage while electrical load (A/C, headlight etc.) is operating.

(See BATTERY INSPECTION [MZR 1.5, MZR 1.6].)

(See BATTERY INSPECTION [MZR 2.0, MZR 2.5].)

• Is the battery voltage normal?

Yes

Inspect the wiring harness in ABS HU/CM terminal N and terminal B related circuit.

Repair or replace the suspected wiring harness if necessary.

Inspect the charging system (such as drive belt tension and generator).

(See GENERATOR INSPECTION [MZR 1.5, MZR 1.6].)

(See GENERATOR INSPECTION [MZR 2.0, MZR 2.5].)

Repair or replace the malfunctioning part according to the inspection results.

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