Diagnostic Routine D

Diagnostic Routine D

Diagnostic Overview

B1305:13

Refer to Wiring Diagram Set 117 for schematic and connector information Electrical Diagrams.

Normal Operations and Fault Conditions

When the alarm system is armed, the BCM (Body Control Module) monitors the hood switch. When the hood is opened, the hood switch removes ground from the signal circuit. When the alarm is armed, this signals the BCM (Body Control Module) that an unauthorized intrusion to the engine compartment has occurred and the BCM (Body Control Module) activates the alarm.

DTC Fault Trigger Conditions

Visual Inspection and Diagnostic Pre-checks

Inspect the hood switch.

Pinpoint Test

1. CHECK THE HOOD SWITCH

1. Ignition ON.

2. Disconnect: Hood Switch.

3. Connect a fused jumper wire:

1. Using a scan tool, clear the BCM (Body Control Module) DTCs (Diagnostic Trouble Codes).

2. Using a scan tool, perform the BCM (Body Control Module) self-test.

Is the BCM (Body Control Module) DTC (Diagnostic Trouble Code) B1305:13 retrieved?

2. CHECK THE HOOD SWITCH GROUND CIRCUIT

1. Connect a fused jumper wire:

3. CHECK THE HOOD SWITCH SIGNAL CIRCUIT FOR AN OPEN

1. Ignition OFF.

2. Disconnect: BCM (Body Control Module) C2280A.

3. Measure:

Is the resistance less than 3 ohms?

4. CHECK FOR CORRECT BCM (Body Control Module) OPERATION

1. Ignition OFF.

2. Disconnect and inspect all BCM (Body Control Module) connectors.

3. Repair:

- corrosion (install new connector or terminals- clean module pins)
- damaged or bent pins- install new terminals/pins
- pushed-out pins- install new pins as necessary

4. Reconnect the BCM (Body Control Module) connectors. Make sure they seat and latch correctly.

5. Operate the system and determine if the concern is still present.

Is the concern still present?