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NO.7 ABS WARNING LIGHT STAYS ON MORE THAN 4 s WITH IGNITION SWITCH ON

id040300901700

7 | ABS warning light stays on more than 4 s with ignition switch on.
[TROUBLESHOOTING HINTS] • ABS (ABS/TCS) CM detects ABS system malfunction.

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | 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 (ABS/TCS) HU/CM and WDS or equivalent? | Yes | If the communication error message is displayed even after inspecting according to procedures displayed in the WDS or equivalent, go to Step 4.
No | Go to next step.
2 | INSPECT 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.
3 | INSPECT PID/DATA IN ABS (ABS/TCS) HU/CM Inspect the following items using WDS or equivalent PID/DATA monitor function. • ABS_LAMP (ABS warning light) Is ABS_LAMP ON after more than 4 s with ignition switch on? | Yes | Replace ABS (ABS/TCS) HU/CM (open circuit or short to ground in ABS (ABS/TCS) HU/CM).
No | Go to next step.
*4 | INSPECT WIRING HARNESS BETWEEN ABS (ABS/TCS) HU/CM AND DLC-2 FOR CONTINUITY Disconnect ABS (ABS/TCS) HU/CM connector. Is there continuity between connector terminal O, R and DLC-? | Yes | Go to next step.
No | Repair wiring harness between ABS (ABS/TCS) HU/CM and DLC-2.
5 | INSPECT WIRING HARNESS BETWEEN ABS (ABS/TCS) HU/CM AND DLC-2 FOR SHORT TO B+ Is voltage approx. 12 V at connector terminal O, R? | Yes | Repair wiring harness between ABS (ABS/TCS) HU/CM and DLC-2.
No | Go to next step.
*6 | INSPECT WIRING HARNESS BETWEEN ABS (ABS/TCS) HU/CM AND DLC-2 FOR SHORT TO GROUND Is there continuity between connector terminal O, R and ground? | Yes | Repair wiring harness between ABS (ABS/TCS) HU/CM and DLC-2.
No | Replace ABS (ABS/TCS) HU/CM (communication circuit malfunction is ABS (ABS/TCS) HU/CM).

• 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.