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

id0903d5807800

5

Brake system warning light illuminates

POSSIBLE CAUSE

•  ABS/DSC configuration incomplete or in error •  Instrument cluster configuration incomplete or in error •  BCM malfunction •  ABS HU/CM malfunction •  DSC HU/CM malfunction •  BCM stores DTC •  ABS HU/CM stores DTC •  DSC HU/CM stores DTC •  Brake fluid level sensor malfunction (BCM) •  Parking brake switch malfunction (BCM) •  Instrument cluster malfunction •  Poor connection of instrument cluster connector, terminal damage •  Poor connection of brake fluid level sensor connector, terminal damage •  Poor connection of parking brake switch connector, terminal damage •  Poor connection of ABS HU/CM or DSC HU/CM connector, terminal damage •  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
1	•  Start the engine. •  Release the parking brake. •  Does the brake system warning light turn off?	Yes	Troubleshooting completed. (The system is normal.)
		No	Go to the next step.
2	•  Does the brake fluid need replenishment?	Yes	Inspect brake line for leakage. Repair or replace if necessary. Add brake fluid.
		No	Go to the next step.
3	•  Start the engine. •  Verify that the warning lights and indicator lights condition. •  Do two or more lights illuminate at the same time.	Yes	Go to Step 7.
		No	Go to the next step.
4	•  Retrieve the DTC of ABS CM and DSC CM and BCM using the M-MDS. (See ON-BOARD DIAGNOSIS [ABS].) (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].) (See DTC INSPECTION [BCM].) •  Is there any DTC retrieved?	Yes	Go to the applicable troubleshooting procedure. (See ON-BOARD DIAGNOSIS [ABS].) (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].) (See DTC TABLE [BCM].)
		No	Go to the next step.
5	•  Turn off the ABS warning light using the M-MDS instrument cluster active command modes WL+IL. (See ACTIVE COMMAND MODES TABLE [INSTRUMENT CLUSTER].) •  Does the ABS warning light turn off according to the active command modes?	Yes	If a malfunction is in the vehicle side connector: Verify that the ABS HU/CM or DSC HU/CM connector is connected securely. If the ABS HU/CM or DSC HU/CM connector is poorly connected: •  Connect the ABS HU/CM or DSC HU/CM connector securely. If a malfunction is in the ABS HU/CM or DSC HU/CM connector: •  Replace the ABS HU/CM or DSC HU/CM. (See ABS HU/CM REMOVAL/INSTALLATION.) (See DSC HU/CM REMOVAL/INSTALLATION.) •  Repair or replace malfunctioning part.
		No	Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
6	•  Retrieve the DTC related to the instrument cluster using the M-MDS. (See DTC INSPECTION [INSTRUMENT CLUSTER].) •  Is there any DTC retrieved?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [INSTRUMENT CLUSTER].)
		No	Go to the next step.
7	•  Inspect the brake fluid level sensor, parking brake switch or connectors. •  Is there any malfunction?	Yes	Repair or replace the malfunctioning part.
		No	Go to the next step.
8	•  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 11.
9	•  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. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
10	•  Switch the ignition to 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.
11	•  Disconnect the negative battery cable. •  Measure the resistance between the instrument cluster connector terminals 2X and 2W. •  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. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)