B1820

B1820-HOOD AJAR INPUT CIRCUIT HIGH





For a complete wiring diagram, refer to the Wiring Information

- When Monitored:
Continuously

- Set Condition:
When the TIPM senses the Hood Ajar Switch Sense circuit is open this code will set.





1. TEST FOR INTERMITTENT CONDITION

NOTE: Open the hood and ensure 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

- The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
- Perform the BODY VERIFICATION TEST. Body Verification Test

2. HOOD AJAR SWITCH OPEN
1. Disconnect the Hood Ajar Switch harness connector.
2. 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. (G931) SENSOR GROUND CIRCUIT OPEN




1. Using a 12-volt Test Light connected to 12-volts, check the (G931) Sensor Ground circuit.

Does the test light illuminate?

Yes

- Go To 4

No

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

4. (G70) HOOD AJAR SWITCH SENSE CIRCUIT SHORT TO VOLTAGE




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

Is there any voltage present?

Yes

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

No

- Go To 5

5. (G70) HOOD AJAR SWITCH SENSE CIRCUIT OPEN




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

Is the resistance below 2.0 ohms?

Yes

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

No

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