DTC B1079:13 [BCM]

id0902f5415000

Description

Bonnet latch switch circuit malfunction
Detection condition
•  BCM detects an open circuit in bonnet latch switch circuit with the ignition switched ON (engine off or on).
Fail-safe
Not applicable
Possible cause
•  Bonnet latch switch connector or terminal malfunction
•  Open circuit in wiring harness between bonnet latch switch terminal B and body ground
•  Bonnet latch switch malfunction
•  BCM connector or terminal malfunction
•  Open circuit in wiring harness between bonnet latch switch terminal A and BCM terminal 3W
•  BCM malfunction

Diagnostic Procedure

Step

Inspection

Action
1
VERIFY BCM DTCs AGAIN
•  Clear the DTC for the BCM using the M-MDS.
•  Retrieve the BCM DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Go to the next step.
No
Go to Step 8.
2
INSPECT BONNET LATCH SWITCH CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  Disconnect the bonnet latch switch 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.
3
INSPECT BONNET LATCH SWITCH GROUND CIRCUIT FOR OPEN CIRCUIT
•  Verify that the bonnet latch switch connector is disconnected.
•  Inspect for continuity between bonnet latch switch terminal B (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 bonnet latch switch terminal B 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 7.
4
INSPECT BONNET LATCH SWITCH
•  Inspect the bonnet latch switch.
•  Is the bonnet latch switch normal?
Yes
Go to the next step.
No
Replace the bonnet latch switch, then go to Step 7.
(See BONNET LATCH REMOVAL/INSTALLATION.)
5
INSPECT BCM CONNECTOR CONDITION
•  Disconnect the BCM 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.
6
INSPECT BONNET LATCH SWITCH CIRCUIT FOR OPEN CIRCUIT
•  Verify that the bonnet latch switch and BCM connectors are disconnected.
•  Inspect for continuity between bonnet latch switch terminal A (wiring harness-side) and BCM terminal 3W (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 bonnet latch switch terminal A and BCM terminal 3W.
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.
7
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Always reconnect all disconnected connectors.
•  Connect the negative battery cable.
•  Clear the DTC for the BCM using the M-MDS.
•  Retrieve the BCM DTCs using the M-MDS.
•  Is the same DTC displayed?
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.
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 [BCM].)
No
DTC troubleshooting completed.