NO.4 BOTH ABS WARNING LIGHT AND BRAKE SYSTEM WARNING LIGHT STAY ON MORE THAN 4 SECONDS WITH IGNITION SWITCH ON [ABS]

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

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY THAT THE ABS CM COMMUNICATION CONDITION TO OTHER MODULE •  Retrieve ABS DTC using the M-MDS. •  Is error message displayed regarding communication between ABS and M-MDS?	Yes	If a communication error message is displayed even after inspecting according to procedure displayed on M-MDS, go to Step 6.
		No	Go to the next step.
2	INSPECT FOR DTCS IN ABS •  Retrieve ABS DTC using the M-MDS. •  Is there any ABS DTC displayed?	Yes	Go to applicable DTC troubleshooting procedure. (See ON-BOARD DIAGNOSIS [ABS].)
		No	Go to the next step.
3	INSPECT DTCS IN INSTRUMENT CLUSTER •  Retrieve instrument cluster DTC using the M-MDS. •  Is DTC U0415:92 displayed?	Yes	Go to the next step.
		No	Go to Step 6.
4*	INSPECT ABS CM POWER SUPPLY VOLTAGE •  Monitor PID VPWR using the M-MDS data monitor function. •  Is the monitoring value above 10 V?	Yes	ABS CM internal malfunctions. Replace the ABS CM. (See ABS HU/CM REMOVAL/INSTALLATION [L.H.D.].) (See ABS HU/CM REMOVAL/INSTALLATION [R.H.D.].)
		No	Go to the next step.
5	INSPECT WHETHER IS IN INSTRUMENT CLUSTER OR ELSEWHERE •  Release the parking brake. •  Turn off all warning light and indicator light using M-MDS simulation function WL+IL? (See ACTIVE COMMAND MODES TABLE [INSTRUMENT CLUSTER].) •  Does the ABS warning light turn off?	Yes	Go to the next step.
		No	Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
6	INSPECT FOR CONNECTION OF ABS HU/CM CONNECTOR •  Is the ABS HU/CM connector connected securely?	Yes	Go to Step 8.
		No	Connect the connector securely, then go to the next step.
7	VERIFY ABS WARNING LIGHT OPERATION •  Turn the ignition switch to ON position. •  Does the ABS warning light turn off 4 seconds after the ignition switch is ON position?	Yes	Troubleshooting is completed. (ABS HU/CM connector is not connected securely.)
		No	Go to the next step.
8	INSPECT BATTERY VOLTAGE •  Inspect battery voltage. •  Is the battery voltage normal?	Yes	Go to the next step.
		No	Inspect charging system. Replace the battery if necessary.
9	INSPECT BATTERY VOLTAGE WHILE ELECTRICAL LOAD IS OPERATING •  Inspect the battery voltage while electrical load (A/C, headlight etc.) is operating. •  Is the battery voltage normal?	Yes	Inspect wiring harness in ABS HU/CM terminal N and terminal B related circuit.
		No	Inspect the charging system (drive belt tension, generator etc.).