DTC B1079:13 [BCM]

id0902f5415000

Description

• Bonnet latch switch circuit malfunction

Detection Condition

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

Possible Causes

• Bonnet latch switch connector or terminals malfunction

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

• Bonnet latch switch malfunction

• BCM connector or terminals malfunction

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

• BCM malfunction

System Wiring Diagram

am6zzw00006955

Diagnostic Procedure

Step

Inspection

Action

1

PERFORM DTC INSPECTION

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

•  Perform the BCM DTC inspection using the M-MDS.
(See DTC INSPECTION [BCM].)

•  Is the DTC B1079:13 present?

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 there any malfunction?

Yes

Repair or replace the connector or terminals, then go to Step 7.

No

Go to the next step.

3

INSPECT BONNET LATCH SWITCH GROUND CIRCUIT FOR OPEN CIRCUIT

•  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

Repair or replace the wiring harness for a possible open circuit, then go to Step 7.

4

INSPECT BONNET LATCH SWITCH

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

•  Is there any malfunction?

Yes

Replace the bonnet latch switch, then go to Step 7.

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

No

Go to the next step.

5

INSPECT BCM CONNECTOR CONDITION

•  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 7.

No

Go to the next step.

6

INSPECT BONNET LATCH SWITCH POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT

•  Make sure to reconnect all disconnected connectors.

•  Reconnect the negative battery cable.

•  Measure the voltage at the BCM terminal 1S (wiring harness-side).

•  Can the voltage be measured?

Yes

Repair or replace the wiring harness for a possible open circuit, then go to the next step.

No

Go to the next step.

7

VERIFY TROUBLESHOOTING COMPLETED

•  Make sure to reconnect all disconnected connectors.

•  Reconnect the negative battery cable.

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

•  Perform the BCM DTC inspection using the M-MDS.
(See DTC INSPECTION [BCM].)

•  Is the DTC B1079:13 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.

8

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.

Step	Inspection		Action
1	PERFORM DTC INSPECTION • Clear the DTCs using the M-MDS. (See CLEARING DTC [BCM].) • Perform the BCM DTC inspection using the M-MDS. (See DTC INSPECTION [BCM].) • Is the DTC B1079:13 present?	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 there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 7.
2		No	Go to the next step.
3	INSPECT BONNET LATCH SWITCH GROUND CIRCUIT FOR OPEN CIRCUIT • 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.
3		No	Repair or replace the wiring harness for a possible open circuit, then go to Step 7.
4	INSPECT BONNET LATCH SWITCH • Inspect the bonnet latch switch. (See BONNET LATCH SWITCH INSPECTION.) • Is there any malfunction?	Yes	Replace the bonnet latch switch, then go to Step 7. (See BONNET LATCH AND RELEASE LEVER REMOVAL/INSTALLATION.)
4		No	Go to the next step.
5	INSPECT BCM CONNECTOR CONDITION • 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 7.
5		No	Go to the next step.
6	INSPECT BONNET LATCH SWITCH POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT • Make sure to reconnect all disconnected connectors. • Reconnect the negative battery cable. • Measure the voltage at the BCM terminal 1S (wiring harness-side). • Can the voltage be measured?	Yes	Repair or replace the wiring harness for a possible open circuit, then go to the next step.
6		No	Go to the next step.
7	VERIFY TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Reconnect the negative battery cable. • Clear the DTCs using the M-MDS. (See CLEARING DTC [BCM].) • Perform the BCM DTC inspection using the M-MDS. (See DTC INSPECTION [BCM].) • Is the DTC B1079:13 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.
7		No	Go to the next step.
8	VERIFY THAT NO OTHER DTCs ARE PRESENT • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [BCM].)
8		No	DTC troubleshooting completed.