NO.3 ABS WARNING LIGHT DOES NOT ILLUMINATE WITH SWITCH THE IGNITION TO ON [ABS]

id0403a5891400

3	ABS warning light does not illuminate with switch the ignition to ON
POSSIBLE CAUSE	•  Malfunction of instrument cluster or ABS HU/CM •  Communication error between ABS HU/CM and instrument cluster •  ABS HU/CM does not operate.

Diagnostic procedure

STEP	INSPECTION		ACTION
1	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 5.
2	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.
*3	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.
*4	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.
5	VERIFY WHERE MALFUNCTION IS IN WARNING LIGHTS AND INDICATOR LIGHTS’ COMMON POWER SUPPLY, OR IN OTHER WARNING LIGHTS AND INDICATOR LIGHTS •  Connect the M-MDS to the DLC-2. •  Turn on all warning lights and indicator lights using the instrument cluster PID WL+IL of active command modes. (See ACTIVE COMMAND MODES INSPECTION [INSTRUMENT CLUSTER].) •  Do other warning and indicator lights illuminate?	Yes	Go to the next step.
		No	Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
6	CONFIRM INSTRUMENT CLUSTER DTC •  Retrieve the instrument cluster DTC using the M-MDS. (See DTC INSPECTION [INSTRUMENT CLUSTER].) •  Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [INSTRUMENT CLUSTER].)
		No	Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)