B1820

B1820-HOOD AJAR INPUT CIRCUIT HIGH





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

- When Monitored:
Continuously

- Set Condition:
When the Totally Integrated Power Module (TIPM) detects and open or short to voltage on the Hood Ajar Switch Sense circuit for over 10 seconds, this code will set.





1. TEST FOR INTERMITTENT CONDITION

NOTE: Open the hood and make sure the Hood Ajar Switch is connected before proceeding.

1. With the scan tool, record and erase DTCs.
2. Close the hood.
3. Cycle the ignition from on to off.
4. Turn the ignition on.
5. Open then close the hood.
6. With the scan tool, read DTCs.

Does the scan tool display B1820-HOOD AJAR INPUT CIRCUIT HIGH?

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
1. Turn the ignition off.
2. Open the hood.
3. Disconnect the Hood Ajar Switch harness connector.
4. For vehicles with a plunger type Hood Ajar Switch, depress the switch plunger. For vehicles with the Hood Ajar Switch integral to the Hood Latch, manually rotate the Hood Latch into the closed position.
5. Measure the resistance between the (G70) Hood Ajar Switch Sense circuit and the (G931) Sensor Return circuit at the component.

Is the resistance approximately 1k Ohms?

Yes

- Go To 3

No

- For vehicles with a plunger-type Hood Ajar Switch, replace the Hood Ajar Switch. Vehicle Theft Security Hood Ajar Switch - Removal For vehicles with the Hood Ajar Switch integral to the Hood Latch, replace the Hood Latch. Hood Latch - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

3. CHECK THE (G70) HOOD AJAR SWITCH SENSE CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS




1. Disconnect the TIPM C4 harness connector.
2. Turn the ignition on.
3. Measure the voltage between ground and the (G70) Hood Ajar Switch Sense circuit.

Is there any voltage present?

Yes

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

No

- Go To 4

4. CHECK THE (G70) HOOD AJAR SWITCH SENSE CIRCUIT FOR AN OPEN IN THE HARNESS




1. Turn the ignition off.
2. Measure the resistance of the (G70) Hood Ajar Switch Sense circuit between the TIPM C4 harness connector and the Hood Ajar Switch harness connector.

Is the resistance below 5.0 Ohms?

Yes

- Go To 5

No

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

5. CHECK THE (G931) SENSOR RETURN CIRCUIT FOR AN OPEN




1. Measure the resistance of the (G931) Sensor Return circuit between the TIPM C4 harness connector and the Hood Ajar Switch harness connector.

Is the resistance below 5.0 Ohms?

Yes

- Replace the Totally Integrated Power Module (TIPM). Totally Integrated Power Module (TIPM) - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

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