NO.6 ABS WARNING LIGHT STAYS ON MORE THAN 4 S WITH SWITCH THE IGNITION TO ON [ABS]

id0403a5891700

6	ABS warning light stays on more than 4 s with switch the ignition to on.
[TROUBLESHOOTING HINTS] •  ABS HU/CM detects ABS system malfunction •  ABS HU/CM detects power supply voltage low •  Malfunctioning in instrument cluster

Diagnostic procedure

STEP	INSPECTION		ACTION
1	CONFIRM INSTRUMENT CLUSTER DTC •  Retrieve the instrument cluster DTC using the M-MDS. (See DTC INSPECTION [INSTRUMENT CLUSTER].) •  Is DTC U0415:92 retrieved?	Yes	Go to the next step.
		No	Go to Step 11.
2	CONFIRM ABS HU/CM DTC •  Retrieve the ABS HU/CM DTC using the M-MDS. (See ON-BOARD DIAGNOSIS [ABS].) •  Is any DTC retrieved?	Yes	Perform the applicable DTC troubleshooting procedure. (See ON-BOARD DIAGNOSIS [ABS].)
		No	If communication error message is displayed on M-MDS screen, go to the next step. If communication error message is not displayed, go to Step 7.
3	INSPECT FOR CONNECTION OF ABS HU/CM CONNECTOR •  Is the ABS connector connected securely?	Yes	Go to Step 7.
		No	Connector the connector securely, then go to the next step.
4	INSPECT ABS POWER SUPPLY FUSE •  Is ABS power supply fuse normal?	Yes	Go to the next step.
		No	Inspect for a short to ground on blown fuse’s circuit. Repair or replace as necessary. Install appropriate amperage fuse.
*5	VERIFY WHETHER MALFUNCTION IS IN WIRING HARNESS (BETWEEN ABS HU/CM POWER SUPPLY AND ABS HU/CM FOR CONTINUITY) OR ELSEWHERE •  Switch the ignition to ON. •  Measure the voltage at ABS HU/CM terminal AF. •  Is voltage approx. 12 V?	Yes	Go to the next step.
		No	Inspect for open circuit between ABS HU/CM and ignition. Repair or replace as necessary.
6	VERIFY WHETHER MALFUNCTION IS IN WIRING HARNESS (BETWEEN INSTRUMENT CLUSTER AND GND FOR CONTINUITY) OR ABS HU/CM •  Switch the ignition to off. •  Disconnect the instrument cluster. •  Verify continuity between the harness-side connector terminal A and GND. •  Is there continuity?	Yes	Replace the ABS HU/CM. (Internal malfunction.) (See ABS HU/CM REMOVAL/INSTALLATION.)
		No	Repair or replace malfunctioning part for open circuit and poor contact in GND point.
7	VERIFY WHETHER MALFUNCTION IS IN ABS HU/CM IGNITION POWER SUPPLY SYSTEM (TERMINAL AF) OR ELSEWHERE •  Switch the ignition to ON. •  Monitor ABS HU/CM PID VPWR using the M-MDS. (See ON-BOARD DIAGNOSIS [ABS].) •  Is the monitored value above 10 V?	Yes	Go to Step 11.
		No	Go to the next step.
8	INSPECT BATTERY •  Is the battery voltage normal?	Yes	Go to the next step.
		No	Charge or replace the battery, then go to the next step.
9	INSPECT CHARGING SYSTEM WITH ELECTRICAL LOAD OPERATING •  Is battery voltage normal with electrical load (A/C, headlight, rear window defroster, etc.) on the engine idling?	Yes	Go to the next step.
		No	Inspect the charging system (drive belt tension, generator, etc.).
*10	VERIFY WHETHER MALFUNCTION IS IN WIRING HARNESS (BETWEEN ABS HU/CM POWER SUPPLY AND ABS HU/CM FOR CONTINUITY) OR ELSEWHERE •  Switch the ignition to ON. •  Measure the voltage at ABS HU/CM terminal AF. •  Is voltage above 10 V?	Yes	Replace the ABS HU/CM. (Internal fault.) (See ABS HU/CM REMOVAL/INSTALLATION.)
		No	Inspect for open circuit between ABS HU/CM and ignition. Repair or replace as necessary.
11	VERIFY WHERE MALFUNCTION IS IN INSTRUMENT CLUSTER OR ABS HU/CM •  Turn off all warning lights and indicator lights using the instrument cluster PID WL+IL of active command modes using the M-MDS. (See ACTIVE COMMAND MODES INSPECTION [INSTRUMENT CLUSTER].) •  Does the ABS warning light turn stay on?	Yes	Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
		No	Replace the ABS HU/CM. (Internal fault.) (See ABS HU/CM REMOVAL/INSTALLATION.)