NO. 5 BRAKE SYSTEM WARNING LIGHT ILLUMINATES [INSTRUMENT CLUSTER]SM2446091
NO. 5 BRAKE SYSTEM WARNING LIGHT ILLUMINATES [INSTRUMENT CLUSTER]

id0903d5807800

5

Brake system warning light illuminates
POSSIBLE CAUSE
• 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
• Malfunction in brake switch input to PCM

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
• Reactive the DTC of PCM using M-MDS. (See ON-BOARD DIAGNOSTIC TEST [L3 Turbo].) (See ON-BOARD DIAGNOSTIC TEST [L5].) (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 [L3 Turbo].)
(See DTC P0703:00 [L3 Turbo].)
(See DTC P0571:00 [L5].)
(See DTC P0703:00 [L5].)
(See DTC P0571:00 [MZR-CD 2.2].)
No
Go to the next step.
3
• Does the brake fluid need replenishment?
Yes
Add brake fluid.
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 DSC HU/CM.
(See ON-BOARD DIAGNOSIS.)
No
Go to the next step.
5
• 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.
6
• 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 8.
7
• 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.)
8
• Turn the ignition switch to the 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
Repair or replace the terminal.
9
• Disconnect the negative battery cable.
• Measure the resistance between the instrument cluster connector terminals 2R and 2T.
• 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.)