DTC B1048:13 [BCM]

id0902f5931000

DESCRIPTION

Brake fluid level sensor circuit malfunction
DETECTION CONDITION
•  Open circuit in the brake fluid level sensor circuit with the brake fluid amount on the upper side of the minimum.
POSSIBLE CAUSE
•  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

Diagnostic Procedure

STEP

INSPECTION

ACTION
1
CONFIRM BCM DTC
•  Clear the DTC using the M-MDS.
•  Perform the BCM DTC inspection using the M-MDS with the brake fluid amount on the upper side of the minimum.
•  Is the same DTC present?
Yes
Go to the next step.
No
Go to Step 9.
2
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?
Yes
Repair or replace the connector or terminals, then go to Step 8.
No
Go to the next step.
3
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?
Yes
Go to the next step.
No
Go to Step 6.
4
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?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open circuit, then go to Step 8.
5
INSPECT BRAKE FLUID LEVEL SENSOR
•  Inspect the brake fluid level sensor.
•  Is there any malfunction?
Yes
Replace the reserve tank, then go to Step 8.
(See MASTER CYLINDER REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)
(See MASTER CYLINDER REMOVAL/INSTALLATION [MZR 1.5, MZR 1.6, MZR 2.0, MZR 2.5, MZ-CD 1.6, MZR-CD 2.2].)
(See MASTER CYLINDER REMOVAL/INSTALLATION [MZR 2.0 DISI i-stop, SKYACTIV-G 2.0].)
No
Go to Step 8.
6
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?
Yes
Repair or replace the connector or terminals, then go to Step 8.
No
Go to the next step.
7
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?
Yes
Repair or replace the wiring harness for a possible open circuit, then go to the next step.
No
BCM internal malfunction can be considered the cause.
•  Go to the next step.
8
VERIFY TROUBLESHOOTING COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Reconnect the negative battery cable.
•  Clear the DTC using the M-MDS.
•  Perform the BCM DTC inspection using the M-MDS with the brake fluid amount on the upper side of the minimum.
•  Is the same DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the BCM.
Go to the next step.
No
Go to the next step.
9
VERIFY THAT NO OTHER DTCs ARE PRESENT
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [BCM].)
No
DTC troubleshooting completed.