Circuit Description
When the ignition switch is in the UNLOCK position, certain class 2
messages do not transmit. The instrument panel cluster (IPC) suspends the
operation of the indicators and the gauges that are dependent on these
messages until the ignition switch is no longer in the UNLOCK position.
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 odometer and the PRNDL displays do not illuminate. |
| • | The fuel gauge and the engine coolant temperature gauge default
to their lowest possible value. |
| • | The scan tool does not communicate with the IPC. |
Conditions for Clearing the DTC
| • | The ignition 0 voltage circuit is greater than 75 percent
of battery positive voltage. The DTC becomes history when the conditions for
setting the DTC are no longer present. |
| • | A history DTC will clear after 100 malfunction free warm-up
cycle. |
| • | The IPC receives the clear code command from the scan tool. |
Diagnostic Aids
| • | When the IPC detects a low voltage at the ignition 0 voltage circuit,
the IPC will not communicate with the scan tool. The odometer and the PRNDL
displays will not illuminate. The season odometer will display if the trip
reset switch is pressed, and the IPC will communicate with the scan tool until
the trip reset switch is released. |
| • | DTC B1367 can only be read by the scan tool as a history code
once the fault is removed. |
