NO. 5 BRAKE SYSTEM WARNING LIGHT ILLUMINATES

id0903d5807800

5

Brake system warning light illuminates

POSSIBLE CAUSE

• ABS HU/CM or DSC 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 GND
• 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

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
• Are there a number of warning lights illuminated?
Yes
Go to Step 5.
No
Go to the next step.
3
• Does the brake fluid need replenishment?
Yes
Add brake fluid.
No
Go to the next step.
4
• Start the instrument cluster input/output check mode.
• Does the brake system warning light turn off with a check code other than 26?
Yes
Inspect the ABS HU/CM, DSC HU/CM, brake fluid level sensor, parking brake switch or connectors.
No
Replace the instrument cluster.
5
• Disconnect the negative battery cable.
• Measure the resistance between the DLC-2 terminals F and E.
• Is the resistance 54-66 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 GND.
• 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 off.
• 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 1J and 1L.
• 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.