DTC B118C:15 [BLIND SPOT MONITORING (BSM)]


id0902i3354600

Description

BSM indicator light (LH) circuit malfunction

Detection condition
•  BSM control module (LH) performs measurement at 0.01 s intervals and an open circuit or short to power supply in the BSM indicator light (LH) circuit is detected 48 times continuously.
Fail-safe function
•  Blind spot monitoring (BSM) system is stopped.
Possible cause
•  Power outer mirror (LH) connector or terminal malfunction
•  Open circuit in wiring harness between power outer mirror (LH) terminal G and body ground
•  BSM control module (LH) connector or terminal malfunction
•  Short to power supply in wiring harness between BSM control module (LH) terminal G and power outer mirror (LH) terminal D
•  Power outer mirror (LH) malfunction
•  BSM indicator light (LH) malfunction
•  Open circuit in wiring harness between BSM control module (LH) terminal G and power outer mirror (LH) terminal D
•  BSM control module (LH) malfunction

Diagnostic Procedure

Step

Inspection

Action

1
INSPECT POWER OUTER MIRROR (LH) CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the power outer mirror (LH) 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 8.
2
INSPECT FOR OPEN CIRCUIT IN BSM INDICATOR LIGHT (LH) GROUND CIRCUIT
•  Verify that the power outer mirror (LH) connector is disconnected.
•  Inspect for continuity between power outer mirror (LH) terminal G (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between power outer mirror (LH) terminal G and body ground.
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 an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 8.
3
INSPECT BSM CONTROL MODULE (LH) CONNECTOR CONDITION
•  Disconnect the BSM control module (LH) 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 8.
4
INSPECT FOR SHORT TO POWER SUPPLY IN BSM INDICATOR LIGHT (LH) SIGNAL CIRCUIT
•  Verify that the BSM control module (LH) and power outer mirror (LH) connectors are disconnected.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the power outer mirror (LH) terminal D (wiring harness-side).
•  Is the voltage 0 V?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between BSM control module (LH) terminal G and power outer mirror (LH) terminal D.
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 power supply.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to power supply.
Go to Step 8.
5
INSPECT POWER OUTER MIRROR (LH)
•  Inspect the power outer mirror (LH).
•  Is the power outer mirror (LH) normal?
Yes
Go to the next step.
No
Replace the power outer mirror (LH), then go to Step 8.
6
INSPECT BSM INDICATOR LIGHT (LH)
•  Inspect the BSM indicator light (LH).
•  Is the BSM indicator light (LH) normal?
Yes
Go to the next step.
No
Replace the outer mirror glass (LH), then go to Step 8.
7
INSPECT FOR OPEN CIRCUIT IN BSM INDICATOR LIGHT (LH) SIGNAL CIRCUIT
•  Verify that the BSM control module (LH) and power outer mirror (LH) connectors are disconnected.
•  Switch the ignition off.
•  Inspect for continuity between BSM control module (LH) terminal G (wiring harness-side) and power outer mirror (LH) terminal D (wiring harness-side).
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between BSM control module (LH) terminal G and power outer mirror (LH) terminal D.
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 an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to the next step.
8
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Always reconnect all disconnected connectors.
•  Clear the BSM control module (LH) DTCs using the M-MDS.
•  Retrieve the BSM control module (LH) DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the BSM control module (LH).
Go to the next step.
No
Go to the next step.
9
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
No
DTC troubleshooting completed.