Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Pickup. However, it is still accessible from the selected car via links, so may be relevant.

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. Refer to BODY VERIFICATION TEST .
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 in accordance with the Service Information. Refer to SWITCH, Hood Ajar , Removal . For vehicles with the Hood Ajar Switch integral to the Hood Latch, replace the Hood Latch in accordance with the Service Information. Refer to LATCH, Hood , Removal .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (G70) HOOD AJAR SWITCH SENSE CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS

Fig 1: Checking Hood Ajar Switch Sense Circuit For A Short To Voltage
Courtesy of CHRYSLER LLC
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. Refer to BODY VERIFICATION TEST .
  No
  - Go To 4.
CHECK THE (G70) HOOD AJAR SWITCH SENSE CIRCUIT FOR AN OPEN IN THE HARNESS

Fig 2: Checking Hood Ajar Switch Sense Circuit For An Open
Courtesy of CHRYSLER LLC
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. Refer to BODY VERIFICATION TEST .
CHECK THE (G931) SENSOR RETURN CIRCUIT FOR AN OPEN

Fig 3: Checking Sensor Return Circuit For An Open
Courtesy of CHRYSLER LLC
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) in accordance with the Service Information. Refer to MODULE, Totally Integrated Power (TIPM) , Removal .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Repair the open in the (G931) Sensor Return circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .