Circuit Description
The instrument panel cluster (IPC) uses the ignition 0 voltage circuit
in order to supply voltage to various indicators and gages. The IPC also receives
a class 2 message from the serial data gateway module (SDGM) indicating the
current power mode.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B1365 Device Ignition 0 (UNLOCK, ON and START) Circuit
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
The ignition 0 voltage circuit is less than 75 percent of battery
voltage for more than 1 second.
Action Taken When the DTC Sets
| • | The fuel gage, tachometer and speedometer default to 0. |
| • | The scan tool does not communicate with the instrument cluster. |
Conditions for Clearing the DTC
| • | The current DTC clears when the conditions for setting the DTC are no
longer present. |
| • | The history DTC clears after 100 malfunction free ignition cycles. |
| • | The IPC receives a clear code command from the scan tool. |
Diagnostic Aids
| • | When the instrument cluster detects low voltage at the ignition 0
voltage circuit, the instrument cluster will not communicate with the scan tool, and
the fuel gage, tachometer and speedometer default to 0. |
| • | DTC B1365 can only be read by the scan tool as a history code
in the IPC once the fault is removed. |
