B1805

CIRCUIT DESCRIPTION
Normal vehicle Class 2 communication does not begin until the system power mode has been identified. The dash integration module (DIM) monitors four discrete wires from the ignition switch contacts in order to determine the present power mode. The DIM communicates the system power mode to all Class 2 modules on the Class 2 serial data line.

CONDITIONS FOR RUNNING THE DTC
The DIM must be powered.

CONDITIONS FOR SETTING THE DTC
One of the 4 monitored ignition switch circuits has malfunctioned.

ACTION TAKEN WHEN THE DTC SETS
The DIM implements default actions for each ignition switch position when faults are detected.

CONDITIONS FOR CLEARING THE DTC
^ A current DTC clears when the malfunction is no longer present.
^ A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.

DIAGNOSTIC AIDS
^ The following may cause an intermittent:
- A bent terminal
- A backed out terminal
- A damaged terminal
- Poor terminal tension
- A chafed wire
- A broken wire inside the insulation
^ When diagnosing for an intermittent condition refer to Testing for Electrical Intermittents in Diagnostic Aids.

TEST DESCRIPTION

Steps 1-7:

Steps 8-14:

The numbers below refer to the step numbers on the diagnostic table.
7. This step determines if the ignition switch is the source of the short to voltage.