DTC B1048:13 [BCM]
id0902f5931000
DESCRIPTION |
Brake fluid level sensor circuit malfunction |
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DETECTION CONDITION
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• Open circuit in the brake fluid level sensor circuit with the brake fluid amount on the upper side of the minimum.
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POSSIBLE CAUSE
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• Brake fluid level sensor connector or terminals malfunction
• Open circuit in wiring harness between brake fluid level sensor terminal A and body ground
• Brake fluid level sensor malfunction
• BCM connector or terminals malfunction
• Open circuit in wiring harness between brake fluid level sensor terminal B and BCM terminal 1N
• BCM malfunction
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Diagnostic Procedure
STEP |
INSPECTION |
ACTION |
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1
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CONFIRM BCM DTC
• Clear the DTC using the M-MDS.
(See CLEARING DTC [BCM].)
• Perform the BCM DTC inspection using the M-MDS with the brake fluid amount on the upper side of the minimum.
(See DTC INSPECTION [BCM].)
• Is the same DTC 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 9.
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2
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INSPECT BRAKE FLUID LEVEL SENSOR CONNECTOR AND TERMINALS
• Switch the ignition to off.
• Disconnect the negative battery cable.
• Disconnect the brake fluid level sensor connector.
• Inspect the connector and terminals (corrosion, damage, pin disconnection).
• Is there any malfunction?
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Yes
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Repair or replace the connector or terminals, then go to Step 8.
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No
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Go to the next step.
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3
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VERIFY MALFUNCTIONING LOCATION
• Verify that the brake fluid level sensor connector is disconnected.
• Reconnect the negative battery cable.
• Switch the ignition to ON.
• Measure the voltage at the brake fluid level sensor terminal B (wiring harness-side).
• Is there any voltage?
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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 BRAKE FLUID LEVEL SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT
• Verify that the brake fluid level sensor connector is disconnected.
• Switch the ignition to off.
• Disconnect the negative battery cable.
• Inspect for continuity between brake fluid level sensor terminal A (wiring harness-side) and body ground.
• Is there continuity?
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Yes
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Go to the next step.
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No
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Repair or replace the wiring harness for a possible open circuit, then go to Step 8.
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5
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INSPECT BRAKE FLUID LEVEL SENSOR
• Inspect the brake fluid level sensor.
• Is there any malfunction?
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Yes
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Replace the reserve tank, then go to Step 8.
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No
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Go to Step 8.
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6
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INSPECT BCM CONNECTOR AND TERMINALS
• Switch the ignition to off.
• Disconnect the negative battery cable.
• Disconnect the BCM connector.
• Inspect the connector and terminals (corrosion, damage, pin disconnection).
• Is there any malfunction?
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Yes
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Repair or replace the connector or terminals, then go to Step 8.
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No
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Go to the next step.
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7
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INSPECT BRAKE FLUID LEVEL SENSOR CIRCUIT FOR OPEN CIRCUIT
• Verify that the brake fluid level sensor and BCM connectors are disconnected.
• Reconnect the BCM connector.
• Reconnect the negative battery cable.
• Measure the voltage at the BCM terminal 1N (wiring harness-side).
• Is there any voltage?
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Yes
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Repair or replace the wiring harness for a possible open circuit, then go to the next step.
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No
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BCM internal malfunction can be considered the cause.
• Go to the next step.
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8
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VERIFY TROUBLESHOOTING COMPLETED
• Make sure to reconnect all disconnected connectors.
• Reconnect the negative battery cable.
• Clear the DTC using the M-MDS.
(See CLEARING DTC [BCM].)
• Perform the BCM DTC inspection using the M-MDS with the brake fluid amount on the upper side of the minimum.
(See DTC INSPECTION [BCM].)
• Is the same DTC present?
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Yes
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Repeat the inspection from Step 1.
• If the malfunction recurs, replace the BCM.
Go to the next step.
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No
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Go to the next step.
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9
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VERIFY THAT NO OTHER DTCs ARE PRESENT
• Are any DTCs present?
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Yes
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Go to the applicable DTC inspection.
(See DTC TABLE [BCM].)
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No
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DTC troubleshooting completed.
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