DTC B1048:7B [FRONT BODY CONTROL MODULE (FBCM)]

id0902p2006600

Description

Brake fluid level sensor circuit malfunction
Detection condition
•  Front body control module (FBCM) detected that the brake fluid level is less than MIN with the ignition switched ON (engine off or on).
Fail-safe function
Not applicable
Possible cause
•  Insufficient brake fluid level
•  Brake fluid level sensor connector or terminal malfunction
•  Front body control module (FBCM) connector or terminal malfunction
•  Short to ground in wiring harness between brake fluid level sensor terminal A and front body control module (FBCM) terminal 2Q
•  Brake fluid level sensor malfunction
•  Front body control module (FBCM) malfunction

Diagnostic Procedure

Step

Inspection

Action
1
VERIFY FRONT BODY CONTROL MODULE (FBCM) DTCs AGAIN
•  Clear the DTC for the front body control module (FBCM) using the M-MDS.
•  Retrieve the front body control module (FBCM) DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Go to the next step.
No
Go to Step 8.
2
INSPECT BRAKE FLUID LEVEL
•  Inspect the brake fluid level.
•  Is the brake fluid level normal?
Yes
Go to the next step.
No
Add genuine brake fluid, then go to Step 7.
3
INSPECT BRAKE FLUID LEVEL SENSOR CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  Disconnect the brake fluid level sensor connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 7.
4
INSPECT FRONT BODY CONTROL MODULE (FBCM) CONNECTOR CONDITION
•  Disconnect the front body control module (FBCM) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 7.
5
INSPECT FOR SHORT TO GROUND IN BRAKE FLUID LEVEL SENSOR SIGNAL CIRCUIT
•  Verify that the brake fluid level sensor and front body control module (FBCM) connectors are disconnected.
•  Inspect for continuity between front body control module (FBCM) terminal 2Q (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Refer to the wiring diagram and verify whether or not there is a common connector between brake fluid level sensor terminal A and front body control module (FBCM) terminal 2Q.
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to ground.
Go to Step 7.
No
Go to the next step.
6
INSPECT BRAKE FLUID LEVEL SENSOR
•  Inspect the brake fluid level sensor.
•  Is the brake fluid level sensor normal?
Yes
Go to the next step.
No
Replace the brake fluid level sensor, then go to the next step.
(See MASTER CYLINDER REMOVAL/INSTALLATION [L.H.D.].)
(See MASTER CYLINDER REMOVAL/INSTALLATION [R.H.D.].)
7
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Always reconnect all disconnected connectors.
•  Reconnect the negative battery cable.
•  Clear the DTC for the front body control module (FBCM) using the M-MDS.
•  Retrieve the front body control module (FBCM) DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the front body control module (FBCM).
Go to the next step.
No
Go to the next step.
8
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [FRONT BODY CONTROL MODULE (FBCM)].)
No
DTC troubleshooting completed.