B181E

B181E-13-HOOD AJAR INPUT - CIRCUIT OPEN





For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

The Body Control Module (BCM) provides a reference voltage on the hood ajar switch sense circuit through a pull-up resistor that is connected to battery voltage. The Hood Ajar Switch switches the hood ajar switch sense circuit to ground when the hood is open. A diagnostic resistor internal to the switch is placed in parallel with the switch.

- When Monitored:
Continuously

- Set Condition:
When the BCM detects that the parallel resistor is not detected in the circuit and the switch is not closed.





1. CHECK FOR ACTIVE DIAGNOSTIC TROUBLE CODE (DTC)
1. Turn the ignition on.
2. With the scan tool, clear all DTCs.
3. With the scan tool, read DTCs.

Does the scan tool display DTC: B181E-13-HOOD AJAR INPUT - CIRCUIT OPEN as active?

Yes

- Go To 2

No

- Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. CHECK THE HOOD AJAR SWITCH FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the Hood Ajar Switch harness connector.
3. Depress the plunger of the hood ajar switch and measure the resistance between the two terminals of the switch.

Is the resistance approximately 1k Ohms?

Yes

- Go To 3

No

- Replace the Hood Ajar Switch.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

3. CHECK THE (G70) HOOD AJAR SWITCH SENSE CIRCUIT FOR AN OPEN




1. Turn the ignition on.
2. Measure the voltage between ground and the (G70) Hood Ajar Switch Sense circuit.

Is the voltage above 10.5 volts?

Yes

- Go To 4

No

- Repair the open in the (G70) Hood Ajar Switch Sense circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. CHECK THE (G931) GROUND CIRCUIT FOR AN OPEN




1. Turn the ignition off.
2. Using a 12-volt test light connected to 12-volts, check the (G931) Ground circuit.

Does the test light illuminate brightly?

Yes

- Replace the BCM. Body Control Module - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Repair the open in the (G931) Ground circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.