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) senses greater than expected voltage on the Hood Ajar Switch Sense circuit for over 10 seconds, this code will set.





Diagnostic Test

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

- 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. CHECK THE HOOD AJAR SWITCH FOR CORRECT OPERATION
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. CHECK THE (G931) SENSOR GROUND CIRCUIT FOR AN 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 open in the (G931) Sensor Ground circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

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




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 5

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




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

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

No

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