DTC B1079:13 [BCM]

id0902f5415000

Malfunction Location

• Bonnet latch switch circuit malfunction

Detection Condition

• Open circuit detected in bonnet latch switch circuit with the bonnet closed (bonnet latch switch on)

Possible Causes

• Open circuit in wiring harness between bonnet latch switch connector terminal A and BCM connector terminal 1S

• Open circuit in wiring harness between bonnet latch switch connector terminal B and body ground

• Bonnet latch switch malfunction

• BCM malfunction

System Wiring Diagram

am6zzw00002040

Diagnostic Procedure

Step

Inspection

Action

1

PERFORM DTC INSPECTION

•  Clear DTCs using the M-MDS.
(See CLEARING DTC [BCM].)

•  Perform the BCM DTC inspection using the M-MDS with the bonnet closed (bonnet latch switch on).
(See DTC INSPECTION [BCM].)

•  Is DTC B1079:13 displayed?

Yes

Go to the next step.

No

DTC troubleshooting completed.

2

INSPECT BONNET LATCH SWITCH CONNECTOR CONDITION

•  Switch the ignition to off.

•  Disconnect the negative battery cable.

•  Disconnect the bonnet latch switch connector.

•  Inspect the connector and terminals (corrosion, damage, pin disconnection).

•  Is the connector normal?

Yes

Go to the next step.

No

Repair/replace the connector or terminal.

After repair procedure, go to Step 8.

3

INSPECT BONNET LATCH SWITCH CIRCUIT FOR OPEN CIRCUIT

•  Reconnect the negative battery cable.

•  Measure the voltage at bonnet latch switch connector terminal A.

•  Can the voltage be measured?

Yes

Go to the next step.

No

Go to Step 6.

4

INSPECT BONNET LATCH SWITCH CIRCUIT FOR OPEN CIRCUIT

•  Disconnect the negative battery cable.

•  Inspect for continuity between bonnet latch switch connector terminal B and body ground.

•  Is there continuity?

Yes

Go to the next step.

No

Repair/replace the wiring harness.

After repair procedure, go to Step 8.

5

INSPECT BONNET LATCH SWITCH

•  Inspect the bonnet latch switch.
(See BONNET LATCH SWITCH INSPECTION.)

•  Is the bonnet latch switch normal?

Yes

Go to Step 8.

No

Replace the bonnet latch switch.

(See BONNET LATCH AND RELEASE LEVER REMOVAL/INSTALLATION.)

After replacement, go to Step 8.

6

INSPECT BCM CONNECTOR CONDITION

•  Disconnect the negative battery cable.

•  Disconnect the BCM connector.

•  Inspect the connector and terminals (corrosion, damage, pin disconnection).

•  Is the connector normal?

Yes

Go to the next step.

No

Repair/replace the connector or terminal.

After repair procedure, go to Step 8.

7

INSPECT BCM

•  Reconnect the BCM connector.

•  Reconnect the negative battery cable.

•  Measure the voltage at BCM connector terminal 1S.

•  Can the voltage be measured?

Yes

Repair/replace the wiring harness.

After repair procedure, go to the next step.

No

Go to the next step.

8

VERIFY DTC

•  Reconnect the disconnected connectors and the negative battery cable.

•  Clear DTCs using the M-MDS.
(See CLEARING DTC [BCM].)

•  Perform the BCM DTC inspection using the M-MDS with the bonnet closed (bonnet latch switch on).
(See DTC INSPECTION [BCM].)

•  Is the same DTC present?

Yes

Repeat the inspection from Step 1.

If the malfunction recurs, replace the BCM.

(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)

Go to the next step.

No

Go to the next step.

9

VERIFY THAT NO OTHER DTCs ARE PRESENT

•  Are there other DTCs output?

Yes

Perform the corresponding DTC inspection.

No

DTC troubleshooting completed.

Step	Inspection		Action
1	PERFORM DTC INSPECTION • Clear DTCs using the M-MDS. (See CLEARING DTC [BCM].) • Perform the BCM DTC inspection using the M-MDS with the bonnet closed (bonnet latch switch on). (See DTC INSPECTION [BCM].) • Is DTC B1079:13 displayed?	Yes	Go to the next step.
1		No	DTC troubleshooting completed.
2	INSPECT BONNET LATCH SWITCH CONNECTOR CONDITION • Switch the ignition to off. • Disconnect the negative battery cable. • Disconnect the bonnet latch switch connector. • Inspect the connector and terminals (corrosion, damage, pin disconnection). • Is the connector normal?	Yes	Go to the next step.
2		No	Repair/replace the connector or terminal. After repair procedure, go to Step 8.
3	INSPECT BONNET LATCH SWITCH CIRCUIT FOR OPEN CIRCUIT • Reconnect the negative battery cable. • Measure the voltage at bonnet latch switch connector terminal A. • Can the voltage be measured?	Yes	Go to the next step.
3		No	Go to Step 6.
4	INSPECT BONNET LATCH SWITCH CIRCUIT FOR OPEN CIRCUIT • Disconnect the negative battery cable. • Inspect for continuity between bonnet latch switch connector terminal B and body ground. • Is there continuity?	Yes	Go to the next step.
4		No	Repair/replace the wiring harness. After repair procedure, go to Step 8.
5	INSPECT BONNET LATCH SWITCH • Inspect the bonnet latch switch. (See BONNET LATCH SWITCH INSPECTION.) • Is the bonnet latch switch normal?	Yes	Go to Step 8.
5		No	Replace the bonnet latch switch. (See BONNET LATCH AND RELEASE LEVER REMOVAL/INSTALLATION.) After replacement, go to Step 8.
6	INSPECT BCM CONNECTOR CONDITION • Disconnect the negative battery cable. • Disconnect the BCM connector. • Inspect the connector and terminals (corrosion, damage, pin disconnection). • Is the connector normal?	Yes	Go to the next step.
6		No	Repair/replace the connector or terminal. After repair procedure, go to Step 8.
7	INSPECT BCM • Reconnect the BCM connector. • Reconnect the negative battery cable. • Measure the voltage at BCM connector terminal 1S. • Can the voltage be measured?	Yes	Repair/replace the wiring harness. After repair procedure, go to the next step.
7		No	Go to the next step.
8	VERIFY DTC • Reconnect the disconnected connectors and the negative battery cable. • Clear DTCs using the M-MDS. (See CLEARING DTC [BCM].) • Perform the BCM DTC inspection using the M-MDS with the bonnet closed (bonnet latch switch on). (See DTC INSPECTION [BCM].) • Is the same DTC present?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.) Go to the next step.
8		No	Go to the next step.
9	VERIFY THAT NO OTHER DTCs ARE PRESENT • Are there other DTCs output?	Yes	Perform the corresponding DTC inspection.
9		No	DTC troubleshooting completed.