B1820

B1820-HOOD AJAR INPUT CIRCUIT HIGH





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

- When Monitored:
With the ignition on.

- Set Condition:
When the Totally Integrated Power Module (TIPM) senses 12 volts 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 this DTC 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. INCORRECT HOOD AJAR SWITCH INSTALLED
1. Inspect the retainer ring on the hood ajar switch.
2. A dark brown retainer ring identifies the switch used for certain export applications, while a white retainer ring identifies the remote starter system application.

Is the correct switch installed?

Yes

- Go To 3

No

- Replace the Hood Ajar Switch. \e6756578>
- Perform the BODY VERIFICATION TEST. Body Verification Test.

3. HOOD AJAR SWITCH OPEN
1. Disconnect and remove the Hood Ajar Switch.
2. Depress the switch plunger and measure the resistance between the two terminals of the switch.

Is the resistance approximately 1,000 Ohms?

Yes

- Go To 4

No

- Replace the Hood Ajar Switch. \e6756578>
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. (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 5

No

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

5. (G70) HOOD AJAR SWITCH SENSE CIRCUIT 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 6

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