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NO.3 BRAKE SYSTEM WARNING LIGHT STAYS ON MORE THAN 4 SECONDS WITH IGNITION SWITCH ON. (PARKING BRAKE IS RELEASED.)

BME040343000218

3 | BRAKE system warning light stays on more than 4 seconds with ignition switch ON. (Parking brake is released.).
[TROUBLESHOOTING HINTS] • ABS/TCS HU/CM detects ABS system malfunction. • ABS/TCS HU/CM detects low voltage in power supply. (ABS/TCS HU/CM ignition Terminal Z voltage is below about 10 V). • BRAKE system warning light circuit open or shorted to ground.

• Brake fluid level sensor circuit shorted ground.

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | INSPECT ABS WARNING LIGHT • Does ABS warning light also illuminate? | Yes | Go to symptom troubleshooting No.1.
No | Go to next step.
2 | INSPECT BRAKE FLUID LEVEL • Is brake fluid level okay? | Yes | Go to next step.
No | Add brake fluid.
3 | INSPECT WIRING HARNESS BETWEEN ABS/TCS HU/CM AND DLC-2 (DATA KINK CONNECTOR-2) FOR CONTINUITY AND SHORTS • Inspect the following items using WDS or equivalent.

  - BRAKE_LMP (BRAKE system warning light)

• Is error message displayed regarding communication between ABS/TCS HU/CM and WDS or equivalent?
Yes
If communication error message is displayed even after inspecting according to procedures displayed on the WDS or equivalent, go to Step 6.
No | Go to next step.
4 | INSPECT PID/DATA IN ABS/TCS HU/CM • Select the following items using WDS or equivalent?

  - BRAKE_LMP (BRAKE system warning light)

• Is BRAKE_LMP is ON after more than 4 seconds with ignition switch ON?
Yes
Replace ABS/TCS HU/CM.
No | Go to next step.
5 | VERIFY WHETHER MALFUNCTION IS IN BRAKE FLUID LEVEL SENSOR OR IN SOME OTHER PART • Disconnect brake fluid level sensor connector. • Does BRAKE system warning light go out with ignition switch ON? | Yes | Inspect brake fluid level sensor.
No | Perform the following inspections. Repair if necessary. • Open in wiring harness between ABS/TCS HU/CM (terminal X) and instrument cluster (BRAKE system warning light) • Short to ground in wiring harness between instrument cluster (BRAKE system warning light)
If above inspections are okay, replace instrument cluster (open or ground to short in instrument cluster).
*6 | INSPECT WIRING HARNESS BETWEEN ABS/TCS HU/CM AND DLC-2 FOR CONTINUITY • Disconnect ABS/TCS HU/CM connector. Connect SST (adapter harness) (vehicle harness side only). • Is there continuity between SST connector terminal T and DLC-2? | Yes | Go to next step.
No | Repair wiring harness between ABS/TCS HU/CM and DLC-2.
*7 | INSPECT WIRING HARNESS BETWEEN ABS/TCS HU/CM AND DLC-2 FOR SHORT TO B+ • Is voltage approximately 12 V at SST connector terminal T? | Yes | Repair wiring harness between ABS/TCS HU/CM and DLC-2.
No | Go to next step.
*8 | INSPECT WIRING HARNESS BETWEEN ABS/TCS HU/CM AND DLC-2 (DATA LINK CONNECTOR-2) FOR SHORT TO GROUND • Is there continuity between SST connector terminal T and ground? | Yes | Repair wiring harness between ABS/TCS HU/CM and DLC-2.
No | Replace ABS/TCS HU/CM (communication circuit malfunction in ABS/TCS HU/CM).