B3009
DTC B3009
CIRCUIT DESCRIPTION
The hybrid control module (HCM) uses the hood switch signal to monitor the open or closed position of the hood for hybrid system function. The hood switch indicates the state of the vehicle hood, either open or closed. The hood switch output signal is an input to an HCM. Five volts is supplied to the switch, the returned voltage is measured relative to HCM signal ground to determine the switch state. A resistor network in the switch circuitry ensures that shorted high and low states can be diagnosed successfully. There are 2 valid voltage ranges of the return signal, one representing hood open, the other representing hood closed. If the voltage is lower than a threshold, a short low is indicated. Similarly, if the voltage is greater than the short high threshold, a short high is indicated. If the voltage is not high, low, open, or closed, then the state invalid is indicated. Driver Notification - Hood Ajar is used to request the instrument panel cluster (IPC) to display or clear the Hood Ajar message on the driver information center (DIC). This message will be displayed by the IPC until the driver acknowledges the message e.g., via the IPC Stem, Trip, Fuel, Personalization or Select buttons on the Steering Wheel or until requested off by the HCM via GMLAN message. The HCM shall not request the message to be displayed again until the next ignition cycle if the conditions for setting the message still exist unless or until the hood transitions back to closed and then back to reopened.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B3009 Hood Ajar Circuit High
CONDITIONS FOR RUNNING THE DTC
- The ignition is ON.
- The auxiliary power outlet (APO) switch is requested ON.
CONDITIONS FOR SETTING THE DTC
- Hood position condition met indicates that the hood position, as read by the HCM, meets the HCM requirements for entry into idle engine off (IEO) hood closed.
- Hood switch voltage less than 0.05 volts.
- HCM run time greater than 5 seconds.
ACTION TAKEN WHEN THE DTC SETS
- The HCM will record the operating conditions presents when the DTC set as Failure Records data only.
- The IPC displays a hood ajar message.
- The malfunction indicator lamp (MIL) will not illuminate.
CONDITIONS FOR CLEARING THE DTC
- The Conditions for Setting the DTC are no longer present.
- A history DTC will clear after 40 malfunction free ignition cycles.
- The HCM receives the clear code command from the scan tool.
DIAGNOSTIC AIDS
Ensure there are no obstructions underhood to prevent the hood from closing securely.
TEST
