Starting System - Electrical Diagnostics: Other Jeep Commander I

Monitor Conditions

1. When Monitored: Continuously

Set Conditions

1. Set Condition: When the FCM senses 12 volts on the Hood Ajar Switch Sense circuit for over 10 seconds, this code will set.

Possible Causes

Scheme 43

Scheme 44

Scheme 45

Scheme 46

1. 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 Go to step 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 «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) .
2. 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 Go to step 3) . No Replace the Hood Ajar Switch. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) .
3. 3) HOOD AJAR SWITCH OPEN Disconnect the Hood Ajar Switch harness connector. Measure the resistance between the two terminals of the Hood Ajar Switch Is the resistance approximately 1000 ohms? Yes Go to step 4) . No Replace the Hood Ajar Switch. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) .
4. 4) (Z384) GROUND CIRCUIT OPEN Using a 12-volt Test Light connected to 12-volts, check the (Z384) Ground circuit. Does the test light illuminate? Yes Go to step 5) . No Repair the (Z384) Ground circuit for an open. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) .
5. 5) (G70) HOOD AJAR SWITCH SENSE CIRCUIT SHORT TO VOLTAGE Disconnect the Front Control Module 49-way connector. Turn the ignition on. 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 «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Go to step 6) .
6. 6) (G70) HOOD AJAR SWITCH SENSE CIRCUIT OPEN Turn the ignition off. Disconnect the Integrated Power Module C2 40-way connector. Measure the resistance of the (G70) Hood Ajar Switch Sense circuit between the IPM connector and the Hood Ajar Switch connector. Is the resistance below 2.0 ohms? Yes Go to step 7) . Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Repair the (G70) Hood Ajar Switch Sense circuit for an open. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) .
7. 7) (G70) IPM HOOD AJAR SWITCH SENSE CIRCUIT OPEN NOTE: Use the graphic connector pinout as a reference to check the Integrated Power Module. Measure the resistance of the (G70) Hood Ajar Switch Sense circuit between the IPM C2 40-connector and the Front Control Module 49-way connector. Is the resistance below 1.0 ohms? Yes Replace the Front Control Module (FCM) in accordance with the service information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Replace the Integrated Power Module (IPM) in accordance with the service information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) .