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NO.3 ABS WARNING LIGHT AND BRAKE SYSTEM WARNING LIGHT STAY ON

BME040300000W07
• When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while doing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, check to make sure connectors, terminals and wiring harness are connected correctly and undamaged.

3 | ABS warning light and BRAKE system warning light stay ON
[TROUBLESHOOTING HINTS] • ABS HU/CM detects ABS proportioning system malfunction • ABS HU/CM detects low voltage in power supply (ABS HU/CM terminal Z voltage is below about 8.5 V.) • ABS HU/CM does not operate • Both warning light circuits (ABS and BRAKE system) open

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | • Perform DTC inspection. • Is error message displayed regarding communication between ABS HU/CM and WDS or equivalent? | Yes | If a communication error message is displayed even after inspecting according to procedures displayed on the WDS or equivalent, go to Step 7.
No | Go to next step.
2 | • Have DTCs been recorded in memory? | Yes | Perform inspection using appropriate DTC.
No | Go to next step.
3 | • Inspect the following items using WDS or equivalent.

  - ABS_LAMP (ABS warning light)
  - BRAKE_LMP (BRAKE system warning light)
  - ABS_VOLT (power supply voltage)

• Is ABS_LAMP and/or BRAKE_LMP on after more than 4 seconds with ignition switch ON?
Yes
Go to Step 6.
No | Go to next step.
*4 | • Disconnect ABS HU/CM connector. Connect SST (adapter harness) (vehicle harness side only). • Use the SST (adapter harness) connector to ground the warning light terminal (ABS: terminal W, BRAKE system: terminal X) to body ground. • Do both ABS warning light and BRAKE system warning light go out with ignition switch ON? | Yes | Replace ABS HU/CM (open circuit in ABS HU/CM).
No | Go to next step.
*5 | • Is there continuity between following SST (adapter harness) connector terminals and instrument cluster connector (16-pin, 24-pin) terminals?

  - Terminal W and 1B
  - Terminal X and 3S

Yes
Replace instrument cluster (open or ground to short in instrument cluster).
No | Repair wiring harness between ABS HU/CM (ABS warning light: terminal W, BRAKE system warning light: terminal X) and instrument cluster.
6 | • Check the voltage for PID/DATA monitor ABS_VOLT item. Specification: above 10 V • Is voltage within specification? | Yes | Replace ABS HU/CM (open or short circuit to B+ in ABS HU/CM).
No | Go to next step.
7 | • Is battery voltage normal? | Yes | Go to next step.
No | Perform inspection of battery and charging system.
8 | • Is battery voltage normal with electrical load (A/C, headlights, etc.) on while engine is idling? | Yes | Go to next step.
No | Perform inspection of charging system (drive belt tension, generator, etc.).
9 | • Is ABS HU/CM connector securely connected? | Yes | Go to Step 11.
No | Connect ABS HU/CM connector securely, then go to next step.
10 | • Do both ABS warning light and BRAKE system warning lights go out after more than 4 seconds with ignition switch ON? | Yes | Temporary poor connection in ABS HU/CM connector. Inspect connector and terminal.
No | Inspect and repair wiring harness for ABS HU/CM power supply (terminal Z) and ground 1 (terminal AA).
*11 | • Disconnect ABS HU/CM connector. Connect SST (adapter harness) (vehicle harness side only). • Is there continuity between SST (adapter harness) connector terminal T and DLC-2? | Yes | Go to next step.
No | Repair wiring harness between ABS HU/CM and DLC-2.
*12 | • Is voltage approximately 12 V at SST (adapter harness) connector terminal T? | Yes | Repair wiring harness between ABS HU/CM and DLC-2.
No | Go to next step.
*13 | • Is there continuity between SST (adapter harness) connector terminal T and ground? | Yes | Repair wiring harness between ABS HU/CM and DLC-2.
No | Inspect and repair wiring harness for ABS HU/CM power supply (terminal Z) and ground 1 (terminal AA).