NO.1 NEITHER ABS WARNING LIGHT NOR BRAKE SYSTEM WARNING LIGHT ILLUMINATE WHEN IGNITION SWITCH TURNED TO ON POSITION [ABS]

id0403a5161600

1 | Neither ABS warning light nor brake system warning light illuminate when ignition switch turned to ON position
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POSSIBLE CAUSE | • Instrument cluster power supply fuse malfunction ― Short to ground in instrument cluster power supply fuse circuit ― Instrument cluster power supply fuse malfunction • Open circuit in instrument cluster ground circuit • Instrument cluster malfunction • Network communication for related system malfunction • Improper configuration of instrument cluster • ABS HU/CM malfunction

STEP | INSPECTION | ACTION
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1 | VERIFY WHETHER MALFUNCTION IS IN COMMON POWER SUPPLY OF WARNING LIGHTS AND INDICATOR LIGHTS, OR IN OTHER WARNING LIGHTS AND INDICATOR LIGHTS • Verify other warning and indicator lights illuminate when the ignition switch is turned to the ON position? • Is there any warning and indicator light? | Yes | Go to Step 4.
No | Go to the next step.
2 | INSPECT INSTRUMENT CLUSTER POWER SUPPLY FUSE • Inspect the instrument cluster power supply fuse. • Is there any malfunction? | Yes | Inspect the blown fuse related wiring harness for short to ground. Repair or replace the wiring harness for a possible short to ground, if necessary. Install the appropriate amperage fuse.
No | Go to the next step.
*3 | VERIFY WHETHER MALFUNCTION IS IN WIRING HARNESS (INSPECT FOR CONTINUITY BETWEEN INSTRUMENT CLUSTER POWER SUPPLY AND INSTRUMENT CLUSTER) OR INSTRUMENT CLUSTER • Turn the ignition switch to the ON position (engine off). • Measure the voltage at instrument cluster terminal 1G (wiring harness-side). • Is the voltage approx. 12 V? | Yes | Replace the instrument cluster (open circuit in instrument cluster internal circuit). (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
No | Inspect the wiring harness between the instrument cluster and body ground for open circuit. Repair or replace the wiring harness for a possible open circuit, if necessary.
4 | CONFIRM DTC U1900 • Retrieve the DTC from the PCM, ABS and instrument cluster. (See ON-BOARD DIAGNOSTIC TEST [L8, LF].) (See ON-BOARD DIAGNOSIS [ABS].) (See DTC INSPECTION [INSTRUMENT CLUSTER].) • Is the DTC U1900 present? | Yes | Go to the next step.
No | Inspect the instrument cluster. (See INSTRUMENT CLUSTER INSPECTION.) If the instrument cluster has a malfunction: • Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.) If the instrument cluster is normal: • Go to Step 6.
5 | CONFIRM DTCS U0121, U0100 AND U0214 • Retrieve the DTC from the instrument cluster. (See DTC INSPECTION [INSTRUMENT CLUSTER].) • Is the DTC U0121, U0100 or U0214 present? | Yes | Replace the instrument cluster (open circuit in instrument cluster). (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
No | Inspect the network communication for related system malfunction. Repair or replace the malfunctioning part according to the inspection results, if necessary.
6 | CONFIRM DTC B2477 • Retrieve the DTC from the instrument cluster. (See DTC INSPECTION [INSTRUMENT CLUSTER].) • Is the DTC B2477 present? | Yes | Perform the instrument cluster configuration. (See INSTRUMENT CLUSTER CONFIGURATION.)
No | Replace the ABS HU/CM. (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.