Diagnostic Test

WARNING: This page is about a different car, the 2008 Dodge Magnum, 2008 Dodge Charger, and 2008 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.

1) TEST FOR INTERMITTENT CONDITION
NOTE: Open the hood and ensure the Hood Ajar Switch is connected before proceeding

With the scan tool, record and erase DTC's

Close the hood.

Cycle the ignition from on to off.

Turn the ignition on.

Open then close the hood.

With the scan tool, read DTC's.

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

Yes
1. Go To step 2).
No
1. 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.
2. Perform BODY VERIFICATION TEST - VER 1 .
2) INCORRECT HOOD AJAR SWITCH INSTALLED
Inspect the retainer ring on the hood ajar switch.

A dark brown retainer ring identifies the hood ajar switch used for certain export applications, while a white retainer ring identifies the remote starter system application.

Is the correct switch installed?

Yes
1. Go To step 3).
No
1. Replace the Hood Ajar Switch.
2. Perform BODY VERIFICATION TEST - VER 1 .
3) HOOD AJAR SWITCH OPEN
Disconnect the Hood Ajar Switch harness connector.

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
1. Go To step 4).
No
1. Replace the Hood Ajar Switch.
2. Perform BODY VERIFICATION TEST - VER 1 .
4) (Z904) GROUND CIRCUIT OPEN

Fig 1: Checking Ground Circuit For Open
Courtesy of CHRYSLER LLC

Using a 12-volt Test Light connected to 12-volts, check the (Z904) Ground circuit.

Does the test light illuminate?

Yes
1. Go To step 5).
No
1. Repair the (Z904) Ground circuit for an open.
2. Perform BODY VERIFICATION TEST - VER 1 .
5) (G70) HOOD AJAR SWITCH SENSE CIRCUIT SHORT TO VOLTAGE

Fig 2: Checking Hood Ajar Switch Sense Circuit For Short To Voltage
Courtesy of CHRYSLER LLC

Disconnect the TIPM C2 connector.

Turn the ignition on.

Measure the voltage between the (G70) Hood Ajar Switch Sense circuit and ground.

Is there any voltage present?

Yes
1. Repair the (G70) Hood Ajar Switch Sense circuit for a short to voltage.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Go To step 6).
6) (G70) HOOD AJAR SWITCH SENSE CIRCUIT OPEN

Fig 3: Checking Hood Ajar Switch Sense Circuit For Open
Courtesy of CHRYSLER LLC

Turn the ignition off.

Measure the resistance of the (G70) Hood Ajar Switch Sense circuit between the TIPM C2 connector and the Hood Ajar Switch connector.

Is the resistance below 2.0 ohms?

Yes
1. Replace the Totally Integrated Power Module (TIPM) in accordance with the service information.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Repair the (G70) Hood Ajar Switch Sense circuit for an open.
2. Perform BODY VERIFICATION TEST - VER 1 .