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NO.4 ABS WARNING LIGHT STAYS ON

BME040343000208
• 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.

4 | ABS warning light stays on
[TROUBLESHOOTING HINTS] • ABS HU/CM detects ABS system malfunction. • ABS HU/CM detects low voltage in power supply (ABS HU/CM terminal Z voltage is below about 10 V or above about 8.5 V). • Warning light circuit 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)
  - ABS_VOLT (power supply voltage)

• Is ABS_LAMP 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 ABS warning light terminal W to body ground. • Does ABS 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 terminal W and instrument cluster connector (16-pin) terminal 1B? | Yes | Replace instrument cluster (open or ground to short in instrument cluster).
No | Repair wiring harness between ABS HU/CM (terminal W) and instrument cluster.
6 | • Check the voltage for PID/DATA monitor ABS_VOLT item. Specification: above more than 10V • Is voltage at specification? | Yes | Replace ABS HU/CM (open or ground to short 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 terminal W securely connected? | Yes | Go to Step 11.
No | Connect ABS HU/CM connector terminal W securely, then go to next step.
10 | • Does ABS warning light go out after more than 4 seconds with ignition switch ON? | Yes | Temporary poor connection of terminal. Inspect ABS HU/CM 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 12V 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)).