NO.6 ABS WARNING LIGHT STAYS ON MORE THAN 4 S WITH SWITCH THE IGNITION TO ON [ABS]

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6	ABS warning light stays on more than 4 s with switch the ignition to ON
POSSIBLE CAUSE	•  ABS HU/CM detects ABS system malfunction. •  ABS HU/CM detects power supply voltage low. •  Malfunctioning in instrument cluster

Diagnostic procedure

STEP	INSPECTION		ACTION
1	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 11.
2	CONFIRM ABS HU/CM DTC •  Retrieve the ABS HU/CM DTC using the M-MDS. (See ON-BOARD DIAGNOSIS [ABS].) •  Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSIS [ABS]s.)
		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.
3	INSPECT FOR CONNECTION OF ABS HU/CM CONNECTOR •  Inspect for connection of the ABS HU/CM connector. •  Is the ABS connector connected securely?	Yes	Go to the next step.
		No	Connect the ABS HU/CM connector securely, then go to Step 7.
4	INSPECT ABS POWER SUPPLY FUSE •  Inspect the ABS 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.
*5	VERIFY WHETHER MALFUNCTION IS IN WIRING HARNESS (BETWEEN ABS HU/CM POWER SUPPLY AND ABS HU/CM FOR CONTINUITY) OR ELSEWHERE •  Switch the ignition to ON. •  Measure the voltage at the ABS HU/CM terminal AF (wiring harness-side). •  Is the voltage approx. 12 V?	Yes	Go to the next step.
		No	Inspect for open circuit between ABS HU/CM and ignition. Repair or replace the wiring harness for a possible open circuit as necessary.
*6	VERIFY WHETHER MALFUNCTION IS IN WIRING HARNESS (BETWEEN ABS HU/CM AND GND FOR CONTINUITY) OR ABS HU/CM •  Switch the ignition to off. •  Disconnect the ABS HU/CM connector. •  Inspect for continuity between ABS HU/CM terminal A (wiring harness-side) and body ground. •  Is there continuity?	Yes	Replace the ABS HU/CM (internal malfunction). (See ABS HU/CM REMOVAL/INSTALLATION.)
		No	Repair or replace the wiring harness for a possible open circuit and poor contact in GND point.
7	VERIFY WHETHER MALFUNCTION IS IN ABS HU/CM IGNITION POWER SUPPLY SYSTEM (TERMINAL AF) OR ELSEWHERE •  Switch the ignition to ON. •  Access the ABS HU/CM PID VPWR using the M-MDS. (See ON-BOARD DIAGNOSIS [ABS].) •  Is the monitored value above 10 V?	Yes	Go to Step 11.
		No	Go to the next step.
8	INSPECT BATTERY •  Inspect the battery. (See BATTERY INSPECTION [MZR 1.8, MZR 2.0, MZR 2.5].) •  Is the battery normal?	Yes	Go to the next step.
		No	Recharge or replace the battery, then go to the next step. (See BATTERY RECHARGING [MZR 1.8, MZR 2.0, MZR 2.5].) (See BATTERY REMOVAL/INSTALLATION [MZR 1.8, MZR 2.0, MZR 2.5].)
9	INSPECT CHARGING SYSTEM WITH ELECTRICAL LOAD OPERATING •  Is the battery voltage normal with electrical load (A/C, headlight, rear window defroster, etc.) on the engine idling?	Yes	Go to the next step.
		No	Inspect the charging system (drive belt tension, generator, etc.). Repair or replace any malfunctioning parts according to the inspection result.
*10	VERIFY WHETHER MALFUNCTION IS IN WIRING HARNESS (BETWEEN ABS HU/CM POWER SUPPLY AND ABS HU/CM FOR CONTINUITY) OR ELSEWHERE •  Switch the ignition to ON. •  Measure the voltage at the ABS HU/CM terminal AF (wiring harness-side). •  Is the voltage approx. 12 V?	Yes	Replace the ABS HU/CM (internal malfunction). (See ABS HU/CM REMOVAL/INSTALLATION.)
		No	Inspect for open circuit between ABS HU/CM and ignition. Repair or replace the wiring harness for a possible open circuit as necessary.
11	VERIFY WHERE MALFUNCTION IS IN INSTRUMENT CLUSTER OR ABS HU/CM •  Connect the M-MDS to the DLC-2. •  Turn off all warning lights and indicator lights using the instrument cluster PID WL+IL of active command modes. (See ACTIVE COMMAND MODES INSPECTION [INSTRUMENT CLUSTER].) •  Does the ABS warning light turn stay on?	Yes	Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
		No	Replace the ABS HU/CM (internal malfunction). (See ABS HU/CM REMOVAL/INSTALLATION.)