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NO.4 BOTH ABS WARNING LIGHT AND BRAKE SYSTEM WARNING LIGHT STAY ON MORE THAN 4 SECONDS WITH IGNITION SWITCH ON [APPLIED VIN (ASSUMED): JM0 DY10Y100 108402-, JM6 DY10*100 109001-]

id0403a3808800

4 | Both ABS warning light and BRAKE system warning light stay on more than 4 seconds with ignition switch on.
[TROUBLESHOOTING HINTS] • ABS HU/CM detects ABS proportioning system malfunction. • ABS HU/CM detects low voltage in power supply (ABS CM ignition terminal N voltage is below about 8 V). • ABS HU/CM does not operate. • Malfunction of communication network.

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | INSPECT ABS HU/CM POWER SUPPLY FUSE • Is ABS HU/CM ignition power supply fuse normal? | Yes | Go to next step. Inspect for a short to ground on blown fuse's circuit.
No | Repair or replace as necessary. Install appropriate amperage fuse.
2 | INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR CONTINUITY AND SHORTS • 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 procedure displayed on WDS or equivalent, go to step 6.
No | Go to next step.
3 | INSPECT FOR DTCS IN ABS HU/CM • Have DTCs been recorded in memory? | Yes | Perform inspection using appropriate DTC.
No | Inspect instrument cluster. If instrument cluster is OK, then go to next step. If instrument cluster malfunction repair instrument cluster, then go to next step.
4 | INSPECT BATTERY • Is battery voltage normal? | Yes | Go to next step.
No | Inspect battery and charging system.
5 | INSPECT CHARGING SYSTEM • Is battery voltage normal with electrical load (A/C, headlight, etc.) on and engine idling? | Yes | Go to next step.
No | Inspect charging system (drive belt tension, generator, etc.).
6 | INSPECT ABS HU/CM IGNITION POWER SUPPLY SYSTEM (TERMINAL N) • Disconnect ABS HU/CM connector. • Turn ignition switch to ON. • Inspect the voltage of connector terminal N. • Specification: approx. 8 V • Is voltage within specification? | Yes | Replace ABS CM (open or short in ground circuit in ABS CM).
No | Repair wiring harness between ABS HU/CM and ground.
7 | INSPECT WIRING HARNESS BETWEEN ABS HU/CM GROUND FOR CONTINUITY • Turn ignition switch to LOCK. • Is there continuity between connector terminal B and ground? | Yes | If a malfunction error message is display on WDS or equivalent in Step 1 inspection, go to next step. If a malfunction error message is not displayed on WDS or equivalent in Step 1 inspection, troubleshooting is completed.
No | Repair wiring harness between ABS HU/CM and ground.
8 | INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR CONTINUITY • Is there continuity between connector terminal H, L and DLC-2?. | Yes | Go to next step.
No | Repair wiring harness between ABS HU/CM and DLC-2.
9 | INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR SHORT TO BATTERY • Is voltage approx. 12 V at connector terminal H, L? | Yes | Repair wiring harness between ABS HU/CM and DLC-2.
No | Go to next step.
10 | INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR SHORT TO GROUND • Is there continuity between connector terminal H, L and DLC-2? | Yes | Repair wiring harness between ABS HU/CM and DLC-2.
No | Replace ABS CM (communication circuit malfunction in ABS CM)