NO. 5 BRAKE SYSTEM WARNING LIGHT ILLUMINATES [INSTRUMENT CLUSTER]

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5 | Brake system warning light illuminates
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POSSIBLE CAUSE | • DSC/RSC HU/CM malfunction • Brake fluid level sensor malfunction • Parking brake switch malfunction • Instrument cluster malfunction • Connector or pin malfunction • Short circuit in wiring harness between CAN-L, CAN-H and ground • Open circuit in CAN wiring harness (CAN-L, CAN-H) • CAN wiring harness (CAN-L, CAN-H) short each other

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | • Start the engine. • Release the parking brake. • Does the brake system warning light turn off? | Yes | Troubleshooting completed.
No | Go to the next step.
2 | • Does the brake fluid need replenishment? | Yes | Add brake fluid.
No | Go to the next step.
3 | • Inspect the DTC for the instrument cluster ON-BOARD DIAGNOSTIC SYSTEM. • Has DTC U2023 been recorded in memory? | Yes | Inspect the DTC for the DSC/RSC HU/CM. (See ON-BOARD DIAGNOSIS [DSC/RSC].)
No | Go to the next step.
4 | • Inspect the brake fluid level sensor, parking brake switch or connectors. • Is there any malfunction? | Yes | Repair or replace malfunctioning part.
No | Go to the next step.
5 | • Disconnect the negative battery cable. • Measure the resistance between the DLC-2 terminals F and E. • Is the resistance below 60 ohms? | Yes | Go to the next step.
No | Go to Step 7.
6 | • Disconnect the negative battery cable. • Inspect the DLC-2 terminals F and E for short to power supply or ground. • Is there any malfunction? | Yes | Inspect the wiring harness and CAN system-related module. Repair or replace the malfunctioning part.
No | Replace the instrument cluster.
7 | • Turn the ignition switch to the OFF position. • Inspect the instrument cluster connector terminals for poor connection (such as damaged/pulled-out pins, and corrosion). • Are the terminals normal? | Yes | Go to the next step.
No | Repair or replace the terminal.
8 | • Disconnect the negative battery cable. • Measure the resistance between the instrument cluster connector terminals 1W and 1X. • Is the resistance 114—126 ohms? | Yes | Inspect the wiring harness and CAN system-related module. Repair or replace the malfunctioning part.
| No | Replace the instrument cluster.