NO.1 NEITHER ABS WARNING LIGHT NOR BRAKE SYSTEM WARNING LIGHT ILLUMINATE WITH SWITCH THE IGNITION TO ON [ABS]

id0403a5950300

1

Neither ABS warning light nor brake system warning light illuminate with switch the ignition to ON

Possible cause

•  ABS HU/CM DTC is stored •  CAN communication malfunction •  Instrument cluster malfunction •  Instrument cluster power supply malfunction ―  Short to ground in instrument cluster power supply circuit ―  Instrument cluster power supply fuse malfunction •  Open circuit in instrument cluster power supply circuit •  Open circuit in wiring harness between instrument cluster and body ground •  ABS CM malfunction

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].)
		No	Inspect the instrument cluster. (See INSTRUMENT CLUSTER INSPECTION.) If the instrument cluster is normal: •  Inspect CAN communication. •  Repair or replace the malfunctioning part according to the inspection results. If the instrument cluster has a malfunction: •  Go to the next step.
2	VERIFY WHETHER MALFUNCTION IS IN WARNING LIGHTS AND INDICATOR LIGHT’S COMMON POWER SUPPLY, OR IN OTHER WARNING LIGHTS AND INDICATOR LIGHTS •  Do other warning and indicator lights illuminate when the ignition is switched to ON?	Yes	Replace the instrument cluster (open circuit in instrument cluster). (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
		No	Go to the next step.
3	INSPECT INSTRUMENT CLUSTER POWER SUPPLY FUSE •  Switch the ignition to off. •  Disconnect the negative battery cable. •  Inspect the instrument cluster ignition power supply fuse. •  Is the fuse normal?	Yes	Go to the next step.
		No	Inspect for short to ground in ignition power supply circuit. Repair or replace if necessary. Install appropriate amperage fuse.
*4	INSPECT INSTRUMENT CLUSTER POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT •  Instrument cluster connector is disconnected. •  Reconnect the negative battery cable. •  Switch the ignition to ON. •  Measure the voltage at instrument cluster terminal 2S (wiring harness-side). •  Is the voltage approx. 12 V?	Yes	Go to the next step.
		No	Inspect for open circuit in wiring harness between instrument cluster and body ground. If the wiring harness has a malfunction: •  Repair or replace the wiring harness. If the wiring harness is normal: •  Replace the ABS CM. (See ABS HU/CM REMOVAL/INSTALLATION.)
5	INSPECT INSTRUMENT CLUSTER GROUND CIRCUIT FOR OPEN CIRCUIT •  Instrument cluster connector is disconnected. •  Switch the ignition to off. •  Disconnect the negative battery cable. •  Inspect for continuity between instrument cluster terminal 2A and body ground. •  Is there continuity?	Yes	Replace the instrument cluster (open circuit in instrument cluster). (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
		No	Inspect and repair for followings: •  Open circuit in wiring between instrument cluster terminal 2A and body ground •  Poor installation of ground point