NO.5 ABS WARNING LIGHT STAYS ON 4 S OR MORE WHEN IGNITION SWITCH TURNED TO ON POSITION [ABS]

5	ABS warning light stays on 4 s or more when ignition switch turned to ON position
POSSIBLE CAUSE	• ABS HU/CM DTC is stored • ABS HU/CM malfunction (open or short to ground in ABS HU/CM internal circuit) • Open circuit in wiring harness between ABS HU/CM terminal Y, Z and DLC-2 • Short to power supply in wiring harness between ABS HU/CM terminal D and body ground • Short to ground in wiring harness between ABS HU/CM terminal D and body ground • ABS HU/CM malfunction (ABS HU/CM internal communication circuit malfunction)

ABS warning light stays on 4 s or more when ignition switch turned to ON position

POSSIBLE CAUSE

• ABS HU/CM DTC is stored

• ABS HU/CM malfunction (open or short to ground in ABS HU/CM internal circuit)

• Open circuit in wiring harness between ABS HU/CM terminal Y, Z and DLC-2

• Short to power supply in wiring harness between ABS HU/CM terminal D and body ground

• Short to ground in wiring harness between ABS HU/CM terminal D and body ground

• ABS HU/CM malfunction (ABS HU/CM internal communication circuit malfunction)

STEP	INSPECTION	ACTION
1	INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC‐2 FOR CONTINUITY AND SHORTS • Perform the Reading DTCs Procedure. (See ON-BOARD DIAGNOSIS [ABS].) • Is the error message displayed regarding communication between ABS HU/CM and M-MDS?	Yes	If a communication error message is displayed even after inspecting according to the procedure displayed on the M-MDS, go to Step 4.
No	Go to the next step.
2	CONFIRM ABS HU/CM DTC • Perform the Reading DTCs Procedure. (See ON-BOARD DIAGNOSIS [ABS].) • Are any DTC present?	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSIS [ABS].)
No	Go to the next step.
3	INSPECT WARNING LIGHT OPERATION • Turn on the all warning light on instrument cluster using the instrument cluster input/output check code 26. (See INSTRUMENT CLUSTER INPUT/OUTPUT CHECK MODE.) • Do the ABS and brake system warning light illuminate?	Yes	Replace the ABS HU/CM (open or short to ground in ABS HU/CM internal circuit). (See ABS HU/CM REMOVAL/INSTALLATION.)
No	Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
^*4	INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC‐2 FOR CONTINUITY • Turn the ignition switch off. • Inspect for continuity between ABS HU/CM terminal Y, Z and DLC-2 (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
No	Repair or replace the wiring harness for a possible open circuit.
^*5	INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC‐2 FOR SHORT TO POWER SUPPLY • Turn the ignition switch to the ON position (engine off). • Measure the voltage at ABS HU/CM terminal Y, Z (wiring harness-side). • Is the voltage approx. 12 V?	Yes	Repair or replace the wiring harness for a possible short to power supply.
No	Go to the next step.
^*6	INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC‐2 FOR SHORT TO GROUND • Turn the ignition switch off. • Inspect for continuity between ABS HU/CM terminal Y, Z (wiring harness-side) and body ground. • Is there continuity?	Yes	Repair or replace the wiring harness for a possible short to ground.
No	Replace the ABS HU/CM (ABS HU/CM internal communication circuit malfunction). (See ABS HU/CM REMOVAL/INSTALLATION.)

STEP

INSPECTION

ACTION

INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC‐2 FOR CONTINUITY AND SHORTS

• Perform the Reading DTCs Procedure.

(See ON-BOARD DIAGNOSIS [ABS].)

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

Yes

If a communication error message is displayed even after inspecting according to the procedure displayed on the M-MDS, go to Step 4.

Go to the next step.

CONFIRM ABS HU/CM DTC

• Perform the Reading DTCs Procedure.

(See ON-BOARD DIAGNOSIS [ABS].)

• Are any DTC present?

Yes

Go to the applicable DTC inspection.

(See ON-BOARD DIAGNOSIS [ABS].)

Go to the next step.

INSPECT WARNING LIGHT OPERATION

• Turn on the all warning light on instrument cluster using the instrument cluster input/output check code 26.

(See INSTRUMENT CLUSTER INPUT/OUTPUT CHECK MODE.)

• Do the ABS and brake system warning light illuminate?

Yes

Replace the ABS HU/CM (open or short to ground in ABS HU/CM internal circuit).

(See ABS HU/CM REMOVAL/INSTALLATION.)

Replace the instrument cluster.

(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)

^*4

INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC‐2 FOR CONTINUITY

• Turn the ignition switch off.

• Inspect for continuity between ABS HU/CM terminal Y, Z and DLC-2 (wiring harness-side).

• Is there continuity?

Yes

Go to the next step.

Repair or replace the wiring harness for a possible open circuit.

^*5

INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC‐2 FOR SHORT TO POWER SUPPLY

• Turn the ignition switch to the ON position (engine off).

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

• Is the voltage approx. 12 V?

Yes

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

Go to the next step.

^*6

INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC‐2 FOR SHORT TO GROUND

• Turn the ignition switch off.

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

• Is there continuity?

Yes

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

Replace the ABS HU/CM (ABS HU/CM internal communication circuit malfunction).

(See ABS HU/CM REMOVAL/INSTALLATION.)

• 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 malfunctions. If there is a problem, verify that the connectors, terminals and wiring harness are connected correctly and undamaged.