NO.5 ABS WARNING LIGHT STAYS ON 4 S OR MORE WITH SWITCH THE IGNITION TO ON [ABS]
id0403a5950700
5 |
ABS warning light stays on 4 s or more with switch the ignition to ON |
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Possible cause
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• Communication network malfunction
• ABS HU/CM DTC is stored
• Instrument cluster malfunction
• ABS CM internal malfunction
• ABS HU/CM connector is not connected securely
• Battery malfunction
• Charging system malfunction
• Open circuit in ABS HU/CM ground circuit
• ABS HU/CM power supply circuit malfunction
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Diagnostic procedure
STEP |
INSPECTION |
ACTION |
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1
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INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR OPEN CIRCUIT AND SHORT CIRCUIT
• Retrieve the ABS HU/CM DTC using the M-MDS.
(See ON-BOARD DIAGNOSIS [ABS].)
• Is any error message displayed regarding communication between ABS HU/CM and M-MDS?
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Yes
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If the communication error message is displayed even after inspecting according to the procedure displayed on the M-MDS:
• Go to Step 6.
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No
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Go to the next step.
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2
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CONFIRM ABS HU/CM DTC
• Retrieve the ABS HU/CM DTC using the M-MDS.
(See ON-BOARD DIAGNOSIS [ABS].)
• Are any DTCs present?
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Yes
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Go to the applicable DTC inspection.
(See ON-BOARD DIAGNOSIS [ABS].)
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No
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Inspect the instrument cluster.
If the instrument cluster is normal:
• Go to the next step.
If the instrument cluster has a malfunction:
• Replace the instrument cluster.
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3
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CONFIRM INSTRUMENT CLUSTER DTC
• Retrieve the instrument cluster DTC using the M-MDS.
• Is the DTC U0415:92 present?
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Yes
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Go to the next step.
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No
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Go to Step 6.
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*4
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INSPECT ABS HU/CM POWER SUPPLY VOLTAGE
• Access the VPWR PID using the M-MDS.
(See ON-BOARD DIAGNOSIS [ABS].)
• Is the VPWR PID value above 10 V?
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Yes
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Replace the ABS CM (ABS CM internal malfunction).
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No
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Go to the next step.
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5
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INSPECT WHETHER MALFUNCTION IS IN INSTRUMENT CLUSTER OR ELSEWHERE
• Release the parking brake.
• Turn on all the warning light and indicator light using the M-MDS simulation function WL+IL.
• Does the ABS warning light turn off?
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Yes
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Go to the next step.
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No
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Replace the instrument cluster.
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6
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INSPECT FOR CONNECTION OF ABS HU/CM CONNECTOR
• Inspect for connection of ABS HU/CM connector.
• Is the ABS HU/CM connector connected securely?
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Yes
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Go to Step 8.
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No
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Reconnect the ABS HU/CM connector securely, then go to the next step.
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7
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VERIFY ABS WARNING LIGHT OPERATION
• Switch the ignition to off, then to ON.
• Does the ABS warning light turn off 4 s after the ignition is switched to ON.
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Yes
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Symptom troubleshooting is completed (ABS HU/CM connector is not connected securely).
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No
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Go to the next step.
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8
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INSPECT BATTERY
• Measure the battery voltage.
(See BATTERY INSPECTION [ZY, Z6].)
(See BATTERY INSPECTION [LF, L5].)
• Is the battery voltage normal?
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Yes
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Go to the next step.
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No
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Inspect the battery and charging system.
(See BATTERY INSPECTION [ZY, Z6].)
(See BATTERY INSPECTION [LF, L5].)
Repair or replace the malfunctioning part according to the inspection results.
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9
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INSPECT BATTERY VOLTAGE WHILE ELECTRICAL LOAD IS OPERATING
• Inspect the battery voltage while electrical load (A/C, headlight etc.) is operating.
(See BATTERY INSPECTION [ZY, Z6].)
(See BATTERY INSPECTION [LF, L5].)
• Is the battery voltage normal?
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Yes
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Inspect the wiring harness in ABS HU/CM terminal N and terminal B related circuit.
Repair or replace the suspected wiring harness if necessary.
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No
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Inspect the charging system (such as drive belt tension and generator).
Repair or replace the malfunctioning part according to the inspection results.
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