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NO.1 ABS WARNING LIGHT STAYS ON MORE THAN 4 SECONDS WITH IGNITION SWITCH ON.

BME040367650W01

1 | ABS warning light stays on more than 4 seconds with ignition switch ON.
[TROUBLESHOOTING HINTS] • ABS/TCS HU/CM detects ABS system malfunction. • ABS/TCS HU/CM detects low voltage in power supply. (ABS/TCS HU/CM Terminal Z voltage is below about 10 V) • ABS/TCS HU/CM does not operate. • ABS warning light circuit open or shorted to ground.

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | INSPECT ABS (ABS/TCS) HU/CM IGNITION POWER SUPPLY FUSE • Is ABS (ABS/TCS) HU/CM ignition power supply fuse okay? | Yes | Go to next step.
No | Check for a short to ground on blown fuse's circuit. Repair or replace as necessary. Install appropriate amperage fuse.
2 | INSPECT WIRING HARNESS BETWEEN ABS (ABS/TCS) HU/CM AND DLC (DATA KINK CONNECTOR-2) FOR CONTINUITY AND SHORTS • Perform DTC inspection. • Is error message displayed regarding communication between ABS (ABS/TCS) 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 8.
No | Go to next step.
3 | CHECK FOR DTCs IN ABS (ABS/TCS) HU/CM • Have DTCs been recorded in memory? | Yes | Perform inspection using appropriate DTC.
No | Go to next step.
4 | INSPECT PID/DATA IN ABS (ABS/TCS) HU/CM • 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 7.
No | Go to next step.
5* | CHECK FOR OPEN CIRCUITS IN ABS (ABS/TCS) HU/CM • Disconnect ABS (ABS/TCS) HU/CM. Connect SST (harness adapter) (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 (ABS/TCS) HU/CM (open circuit in ABS (ABS/TCS) HU/CM).
No | Go to next step.
*6 | INSPECT WIRING HARNESS BETWEEN ABS (ABS/TCS) HU/CM AND INSTRUMENT CLUSTER FOR CONTINUITY • Disconnect all instrument cluster. • Is there continuity between SST (adapter harness) connector terminal W and instrument cluster connector (16-pin) terminal 1B? | Yes | Replace instrument cluster (open or short to ground in instrument cluster).
No | Inspect wiring harness between ABS (ABS/TCS) HU/CM (Terminal W) and instrument cluster.
7 | INSPECT ABS (ABS/TCS) HU/CM IGNITION POWER SUPPLY SYSTEM (TERMINAL Z) • Check the voltage for PID/DATA monitor ABS_VOLT item. Specification: above 10 V • Is voltage within specification? | Yes | Replace ABS (ABS/TCS) HU/CM (open or short circuit to B+ in ABS (ABS/TCS) HU/CM).
No | Go to next step.
8 | INSPECT BATTERY • Is battery voltage normal? | Yes | Go to next step.
No | Perform inspection of battery and charging system.
9 | INSPECT CHARGING SYSTEM • 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.).
10 | VERIFY THAT ABS (ABS/TCS) HU/CM IS CONNECTED • Is ABS (ABS/TCS) HU/CM connector securely connected? | Yes | Go to Step 12.
No | Connect ABS (ABS/TCS) HU/CM securely, then go to next step.
11 | VERIFY THAT MALFUNCTION SYMPTOM OCCURS AFTER ABS (ABS/TCS) HU/CM IS CONNECTED • Does ABS warning light go out after more than 4 seconds with ignition switch ON? | Yes | Temporary poor connection in ABS (ABS/TCS) HU/CM connector. Inspect connector and terminal.
No | Go to next step.
*12 | VERIFY THAT ABS HU/CM CONNECTOR TERMINALS Z, AA AND W ARE CONNECTED • Does malfunction symptom happen again when ABS HU/CM connector Terminals Z, AA and W are shaken while the ignition switch is ON? | Yes | Connect ABS HU/CM connector Terminals Z, AA and W securely, then go to next step.
No | Go to Step 14.
13 | VERIFY THAT MALFUNCTION SYMPTOM OCCURS AFTER ABS HU/CM CONNECTOR TERMINALS Z, AA AND W ARE CONNECTED • Does ABS warning light go out after more than 4 seconds with ignition switch ON? | Yes | Temporary poor connection at terminal. Inspect ABS HU/CM connector and terminal.
No | Go to next step.
*14 | INSPECT WIRING HARNESS BETWEEN FUSE BLOCK AND ABS HU/CM (TERMINAL Z) FOR CONTINUITY • Disconnect ABS HU/CM. Connect SST (adapter harness) (vehicle harness side only). • Is voltage approximately 12 V at SST (adapter harness) connector Terminal Z? | Yes | Go to next step.
No | Repair wiring harness between fuse block and ABS HU/CM.
*15 | INSPECT WIRING HARNESS BETWEEN ABS HU/CM (TERMINAL AA) AND GROUND FOR CONTINUITY • Turn ignition switch to OFF. • Is there continuity between SST (adapter harness) connector Terminal AA and ground? | Yes | If a communication error message is displayed on WDS or equivalent in Step 2 inspection, go to next step. If a communication error message is not displayed on WDS or equivalent in Step 2 inspection, recheck malfunction symptoms.
No | Repair wiring harness between ABS HU/CM and ground.
*16 | INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 (DATA KINK CONNECTOR-2) FOR CONTINUITY • 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.
*17 | INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 (DATA KINK CONNECTOR-2) FOR SHORT TO B+ • 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.
*18 | INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 (DATA KINK CONNECTOR-2) FOR SHORT TO GROUND • Is there continuity between SST (adapter harness) connector Terminal T and ground? | Yes | Repair wiring harness between ABS HU/CM and DLC-2 .
No | Replace ABS HU/CM (communication circuit malfunction in ABS HU/CM).