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NO.6 ABS AND BRAKE SYSTEM WARNING LIGHTS COME ON WHEN DRIVING

BME040343000210
• 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.

6 | ABS and BRAKE system warning lights come on when driving
[TROUBLESHOOTING HINTS] • ABS HU/CM initially detects ABS proportioning system malfunction, but detects normal ABS HU/CM operation when ignition switch is turned ON again. • ABS initially detects low battery voltage, but detects normal ABS HU/CM operation when ignition switch is turned ON again.

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 4.
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)

• Drive vehicle under conditions in which warning light illuminates.
• Confirm the voltage for PID/DATA monitor B+ item under the following conditions:

  - When ABS warning light and BRAKE system warning light illuminate again
  - When ABS_LAMP and/or BRAKE_LMP is ON

Specification: above more than 10 V

• Is voltage within specification?
Yes
Replace ABS HU/CM (open or ground to short in ABS HU/CM).
No | Go to next step.
4 | • Is ABS HU/CM connector securely connected? | Yes | Go to Step 6.
No | Connect ABS HU/CM connector securely, then go to next step.
5 | • Drive vehicle under conditions in which warning light illuminates. • Do both ABS warning light and BRAKE system warning light illuminate again? | Yes | Inspect and repair wiring harness for ABS HU/CM power supply (terminal Z) and ground 1 (terminal AA)).
No | Temporary poor connection in connector. Inspect ABS HU/CM connector and terminal.
*6 | • 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.
*7 | • 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.
*8 | • 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)).