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Diagnostic procedure

NO. 5 BRAKE SYSTEM WARNING LIGHT ILLUMINATES (INSTRUMENT CLUSTER) 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 With malfunction warning light:
  • Go to Step 4.

Without malfunction warning light:
  • Go to the next step.
3 Yes Go to the applicable DTC troubleshooting procedure.
(See DTC P0571:00 .)
(See DTC P0703:00 .)
No Go to the next step.
4
  • Reactive the DTC of instrument cluster using MMDS. (See DTC TABLE .)
  • Is the DTC detected?
 Yes If the DTC U0415:68 or U0415:92 is not detected:
  • Go to the applicable DTC troubleshooting procedure. (See DTC TABLE .)

If the DTC U0415:68 or U0415:92 is detected:
No Go to the next step.
5
  • Inspect followings:
    • Brake fluid level sensor
    • Parking brake switch
    • Wiring harness between brake fluid level sensor and BCM terminal 1N
    • Wiring harness between parking brake switch and BCM terminal 2Q
  • Is there any malfunction?
 Yes Repair or replace malfunctioning part.
No Go to the next step.
6
  • Turn off the brake system warning light using MMDS instrument cluster according to active command modes WL+IL. (See ACTIVE COMMAND MODES TABLE .)
  • Does the brake system warning light turn off active command modes?
 Yes Go to the next step.
No Replace the instrument cluster.
(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION .)
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 8.
8
  • 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.
9
  • Switch the ignition OFF (LOCK).
  • 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 B and D.
  • Is the resistance 114-126 ohms?
 Yes Inspect the wiring harness and CAN system-related module.
Repair or replace the malfunctioning part.
G13727809Courtesy of MAZDA MOTORS CORP.
 No Replace the instrument cluster.
(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION .)
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