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 gages that are dependent on these messages until the ignition
switch is no longer in the UNLOCK position.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B1367 Device Ignition 0 (UNLOCK, ON, and START) Circuit Low
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 gage and the engine coolant temperature gage default to their
minimum physical position. |
| • | The scan tool does not communicate with the instrument cluster. |
Conditions for Clearing the DTC
| • | The DTC becomes history when the conditions for setting the DTC are no
longer present. |
| • | The history DTC clears after 40 malfunction-free warm-up
cycles. |
| • | The IPC receives the 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. The odometer
and the PRNDL displays will not illuminate. The season odometer will display if the
trip reset switch is pressed, and the instrument cluster 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. |
| • | An intermittent condition is likely to be caused by an open condition
in the ignition 0 voltage circuit. |
