NO.1 ANY OF THE FOLLOWING LIGHTS DO NOT ILLUMINATE WITH THE IGNITION ON: (ABS WARNING LIGHT, BRAKE SYSTEM WARNING LIGHT, TCS/DSC INDICATOR LIGHT AND/OR DSC OFF INDICATOR LIGHT) [ELECTRONICALLY CONTROLLED BRAKE SYSTEM]

Troubleshooting item	Any of the following lights do not illuminate with the ignition ON: (ABS warning light, brake system warning light, TCS/DSC indicator light and/or DSC OFF indicator light)
Possible cause	• Electronically controlled brake unit does not operate. • Communication error between electronically controlled brake unit and body control module (BCM) • Communication error between body control module (BCM) and instrument cluster • Instrument cluster malfunction • Electronically controlled brake unit internal malfunction

Step	Inspection	Results	Action
1	VERIFY WHERE MALFUNCTION IS IN WARNING LIGHTS AND INDICATOR LIGHTS’ COMMON POWER SUPPLY, OR IN OTHER WARNING LIGHTS AND INDICATOR LIGHTS • Ignition is switched ON (engine off) • Do other warning and indicator lights illuminate?	Yes	Go to Step 4.
No	If communication error message is displayed on the M-MDS screen: • Go to the next step. If communication error message is not displayed: • Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
^*2	INSPECT INSTRUMENT CLUSTER POWER SUPPLY CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT • Inspect the power supply circuit for an open circuit and short to ground. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location, and perform the repair completion verification.
^*3	INSPECT INSTRUMENT CLUSTER GROUND CIRCUIT FOR SHORT TO POWER SUPPLY AND OPEN CIRCUIT • Inspect the ground circuit for an open circuit and short to power supply. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Replace the instrument cluster, and perform the repair completion verification. (Open circuit in the instrument cluster) (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
No	Repair or replace the malfunctioning location, and perform the repair completion verification.
4	CONFIRM ELECTRONICALLY CONTROLLED BRAKE UNIT DTC • Retrieve the electronically controlled brake unit DTC using the M-MDS. (See DTC INSPECTION.) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [ELECTRONICALLY CONTROLLED BRAKE UNIT].)
No	If communication error message is displayed on the M-MDS screen: • Go to the next step. If communication error message is not displayed: • Go to Step 7.
^*5	INSPECT ELECTRONICALLY CONTROLLED BRAKE UNIT POWER SUPPLY CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT • Inspect the power supply circuit for an open circuit and short to ground. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location, and perform the repair completion verification.
^*6	INSPECT ELECTRONICALLY CONTROLLED BRAKE UNIT GROUND CIRCUIT FOR SHORT TO POWER SUPPLY AND OPEN CIRCUIT • Inspect the power supply circuit for an open circuit and short to power supply. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Replace the electronically controlled brake unit, and perform the repair completion verification. (Open circuit in the electronically controlled brake unit) (See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [R.H.D.].) (See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [L.H.D.].)
No	Repair or replace the malfunctioning location, and perform the repair completion verification.
7	CONFIRM BODY CONTROL MODULE (BCM) DTC • Retrieve the body control module (BCM) DTC using the M-MDS. (See DTC INSPECTION.) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [BODY CONTROL MODULE (BCM) (E)].)
No	Replace the instrument cluster, and perform the repair completion verification. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
Repair completion verification	VERIFY THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR • Install/connect the part removed/disconnected during the troubleshooting procedure. • Has the malfunction symptom been eliminated?	Yes	Complete the symptom troubleshooting. Explain to the customer what has been repaired.
No	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1.

Step

Inspection

Results

Action

VERIFY WHERE MALFUNCTION IS IN WARNING LIGHTS AND INDICATOR LIGHTS’ COMMON POWER SUPPLY, OR IN OTHER WARNING LIGHTS AND INDICATOR LIGHTS

• Ignition is switched ON (engine off)

• Do other warning and indicator lights illuminate?

Yes

Go to Step 4.

If communication error message is displayed on the M-MDS screen:

• Go to the next step.

If communication error message is not displayed:

• Replace the instrument cluster.

(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)

^*2

INSPECT INSTRUMENT CLUSTER POWER SUPPLY CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT

• Inspect the power supply circuit for an open circuit and short to ground.

(See CIRCUIT INSPECTION.)

• Is the circuit normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location, and perform the repair completion verification.

^*3

INSPECT INSTRUMENT CLUSTER GROUND CIRCUIT FOR SHORT TO POWER SUPPLY AND OPEN CIRCUIT

• Inspect the ground circuit for an open circuit and short to power supply.

(See CIRCUIT INSPECTION.)

• Is the circuit normal?

Yes

Replace the instrument cluster, and perform the repair completion verification. (Open circuit in the instrument cluster)

(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)

Repair or replace the malfunctioning location, and perform the repair completion verification.

CONFIRM ELECTRONICALLY CONTROLLED BRAKE UNIT DTC

• Retrieve the electronically controlled brake unit DTC using the M-MDS.

(See DTC INSPECTION.)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [ELECTRONICALLY CONTROLLED BRAKE UNIT].)

If communication error message is displayed on the M-MDS screen:

• Go to the next step.

If communication error message is not displayed:

• Go to Step 7.

^*5

INSPECT ELECTRONICALLY CONTROLLED BRAKE UNIT POWER SUPPLY CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT

• Inspect the power supply circuit for an open circuit and short to ground.

(See CIRCUIT INSPECTION.)

• Is the circuit normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location, and perform the repair completion verification.

^*6

INSPECT ELECTRONICALLY CONTROLLED BRAKE UNIT GROUND CIRCUIT FOR SHORT TO POWER SUPPLY AND OPEN CIRCUIT

• Inspect the power supply circuit for an open circuit and short to power supply.

(See CIRCUIT INSPECTION.)

• Is the circuit normal?

Yes

Replace the electronically controlled brake unit, and perform the repair completion verification. (Open circuit in the electronically controlled brake unit)

(See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [R.H.D.].)

(See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [L.H.D.].)

Repair or replace the malfunctioning location, and perform the repair completion verification.

CONFIRM BODY CONTROL MODULE (BCM) DTC

• Retrieve the body control module (BCM) DTC using the M-MDS.

(See DTC INSPECTION.)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [BODY CONTROL MODULE (BCM) (E)].)

Replace the instrument cluster, and perform the repair completion verification.

(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)

Repair completion verification

VERIFY THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR

• Install/connect the part removed/disconnected during the troubleshooting procedure.

• Has the malfunction symptom been eliminated?

Yes

Complete the symptom troubleshooting.

Explain to the customer what has been repaired.

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].)

If the CAN communication is normal, perform the diagnosis from Step 1.

• 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, check to make sure connectors, terminals and wiring harness are connected correctly and undamaged.