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 •  BCM malfunction •  Brake fluid level sensor malfunction •  Parking brake switch malfunction •  Short to ground circuit in wiring harness between brake fluid level sensor and BCM •  Short to ground circuit in wiring harness between parking brake switch and BCM •  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 •  Malfunction in brake switch signal input to PCM (ZJ, ZY) (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. (The system is normal.)
		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 [ZJ, ZY].) •  Is the DTC P0571:00 or P0703:00 detected?	Yes	Go to the applicable DTC troubleshooting procedure. (See DTC P0571:00 [ZJ, ZY].) (See DTC P0703:00 [ZJ, ZY].)
		No	Go to the next step.
4	•  Inspect following: ―  Brake fluid level sensor ―  Parking brake switch ―  Wiring harness between brake fluid level sensor and BCM terminal 4A ―  Wiring harness between parking brake switch and BCM terminal 7B •  Is there any malfunction?	Yes	Repair or replace malfunctioning part.
		No	Go to the next step.
5	•  Start the engine. •  Verify that the warning and indicator lights condition. •  Do two or more lights illuminate at the same time?	Yes	Go to Step 8.
		No	Go to the next step.
6	•  Reactive the DTC of BCM, ABS HU/CM or DSC HU/CM using M-MDS. (See DTC INSPECTION [BCM].) (See ON-BOARD DIAGNOSIS [ABS].) (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].) •  Is the DTC detected?	Yes	Go to applicable DTC troubleshooting procedure. (See DTC TABLE [BCM].) (See ON-BOARD DIAGNOSIS [ABS].) (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)
		No	Go to the next step.
7	•  Turn off the brake system warning light using M-MDS instrument cluster according to active command modes WL+IL. (See ACTIVE COMMAND MODES INSPECTION [INSTRUMENT CLUSTER].) •  Does the brake system warning light turn off active command modes?	Yes	Verify that the BCM, ABS HU/CM or DSC HU/CM connector is connected securely. If the BCM, ABS HU/CM or DSC HU/CM connector is poor connection: Connect the BCM, ABS HU/CM or DSC HU/CM connector securely. If malfunction is in the BCM, ABS HU/CM or DSC HU/CM side connector: Replace the BCM, ABS HU/CM or DSC HU/CM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.) (See ABS HU/CM REMOVAL/INSTALLATION [L.H.D.].) (See ABS HU/CM REMOVAL/INSTALLATION [R.H.D.].) (See DSC HU/CM REMOVAL/INSTALLATION [L.H.D.].) (See DSC HU/CM REMOVAL/INSTALLATION [R.H.D.].) If malfunction is in vehicle side connector: Repair or replace malfunctioning part.
		No	Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.) (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION [MZ-CD 1.4 DI Turbo, MZ-CD 1.6 (Y6)].)
8	•  Reactive the DTC of instrument cluster using M-MDS. (See DTC INSPECTION [INSTRUMENT CLUSTER].) •  Is the DTC detected?	Yes	Go to the applicable DTC troubleshooting procedure. (See DTC TABLE [INSTRUMENT CLUSTER].)
		No	Go to the next step.
9	•  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 11.
10	•  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.) (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION [MZ-CD 1.4 DI Turbo, MZ-CD 1.6 (Y6)].)
11	•  Turn the ignition switch to LOCK 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	If the instrument cluster connector is poor connection: Connect the instrument cluster connector securely. If malfunction is in the instrument cluster side connector: Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.) (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION [MZ-CD 1.4 DI Turbo, MZ-CD 1.6 (Y6)].) If malfunction is in vehicle side connector: Repair or replace malfunctioning part.
12	•  Disconnect the negative battery cable. •  Measure the resistance between the instrument cluster connector terminals 2B and 2D. •  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.) (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION [MZ-CD 1.4 DI Turbo, MZ-CD 1.6 (Y6)].)