C0847
DTC C0847
Circuit Description
The body control module (BCM) contains the 2 amp EPS fuse. This fuse and the ignition 1 voltage circuit supply ignition voltage to the power steering control module (PSCM). This ignition voltage is used to wake up the PSCM.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0847 Device Ignition 1 Circuit Low
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
* The ignition 1 voltage circuit is shorted to ground or open.
* DTCs U1300 and U1301 are not set.
Action Taken When the DTC Sets
* DTC C0847 is stored in memory.
* The instrument panel cluster (IPC) message center displays the PWR STR warning message.
* The EPS system is disabled.
Conditions for Clearing the DTC
* A current DTC will clear when the malfunction is no longer present.
* A history DTC will clear after 100 consecutive malfunction free ignition cycles.
* Using a scan tool
Diagnostic Aids
The ignition 1 voltage circuit supplies several other control modules with ignition voltage. Before preceding with the diagnostic table below, ensure no other control modules that use the ignition 1 circuit for their ignition voltage supply have any ignition voltage malfunctions present, such as the sensing and diagnostic module (SDM) or the cruise control module (CCM). Refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. Tests if the malfunction is intermittent.
5. Tests if a short to ground exists in the ignition 1 voltage circuit, or in the PSCM.
