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

id0903d5807800

5

Brake system warning light illuminates

POSSIBLE CAUSE

•  ABS HU/CM malfunction •  DSC HU/CM malfunction •  Brake fluid level sensor malfunction •  Brake fluid level is low •  Parking brake switch malfunction •  BCM 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) •  Open or short circuit in wiring harness between brake fluid level sensor and BCM. •  Open or short circuit in wiring harness between parking brake switch and BCM •  CAN wiring harness (CAN-L, CAN-H) short each other •  Malfunction in brake switch input to PCM (Vehicles with brake override system, without malfunction warning light)

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	•  Does the brake fluid need replenishment?	Yes	Add brake fluid.
		No	Vehicles with brake override system, without malfunction warning light •  Go to the next step. Others •  Go to Step 4.
3	•  Reactive the DTC of PCM using M-MDS. (See ON-BOARD DIAGNOSTIC TEST [MZR 1.8, MZR 2.0, MZR 2.5].) (See ON-BOARD DIAGNOSTIC TEST [MZR 2.0 DISI].) (See ON-BOARD DIAGNOSTIC TEST [MZR-CD 2.2].) •  Is the DTC P0571:00 or P0703:00 (except MZR-CD 2.2) detected?	Yes	Go to the applicable DTC troubleshooting procedure. (See DTC P0571:00 [MZR 1.8, MZR 2.0, MZR 2.5].) (See DTC P0703:00 [MZR 1.8, MZR 2.0, MZR 2.5].) (See DTC P0571:00 [MZR 2.0 DISI].) (See DTC P0703:00 [MZR 2.0 DISI].) (See DTC P0571:00 [MZR-CD 2.2].)
		No	Go to the next step.
4	•  Inspect the DTC for the instrument cluster ON-BOARD DIAGNOSTIC SYSTEM. •  Have DTCs U0415:68 or U0415:92 been recorded in memory?	Yes	Inspect the DTC for the instrument cluster. (See DTC TABLE [INSTRUMENT CLUSTER].)
		No	Go to the next step.
5	•  Inspect the DTC for the instrument cluster ON-BOARD DIAGNOSTIC SYSTEM. •  Have DTCs U0140:00 been recorded in memory?	Yes	Inspect the DTC for the instrument cluster. (See DTC TABLE [INSTRUMENT CLUSTER].)
		No	Go to the next step.
6	•  Inspect the followings: ―  Brake fluid level sensor ―  Parking brake switch ―  Wiring harness between brake fluid level sensor and BCM ―  Wiring harness between parking brake switch and BCM •  Is there any malfunction?	Yes	Repair or replace malfunctioning part.
		No	Go to the next step.
7	•  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 9.
8	•  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. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
9	•  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.
10	•  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.)