B2559

Diagnostic Chart:

Schematic:

CIRCUIT DESCRIPTION
The Body Control Module (BCM) receives an active ground. The sole purpose of this input is to provide a ground for all courtesy lamp current flowing through the theater dim output.

CONDITIONS FOR RUNNING THE DTC
It the input does not match a normal ground potential.

CONDITIONS FOR SETTING THE DTC
The BCM detects a open when a ground is expected.
The condition above must be present for more then 0.3 seconds

ACTION TAKEN WHEN THE DTC SETS
The BCM stores DTC B2559 in memory.

CONDITIONS FOR CLEARING THE DTC
^ A current DTC B2559 will clear if the open is no longer detected by the BCM
^ A history DTC B2559 will clear after
100 consecutive ignition cycles if the condition for the malfunction is no longer present nor any other malfunction in the BCM is detected.

DIAGNOSTIC AIDS
^ If the DTC B2559 is a history DTC, the fault may be intermittent. Refer to Testing for Intermittent and Poor Connections in Diagrams.
^ The following conditions may cause an intermittent malfunction to occur:
- An intermittent open in the theater dimming ground circuit.
- The BCM is intermittently opened.

TEST DESCRIPTION
The number(s) below refer to the step number(s) on the diagnostic table.
4. Checks for a short to ground in the lnadv. Power Input circuit.