B1440

CIRCUIT DESCRIPTION

Correct Power Mode Inputs:

The Body Control Module (BCM) is the power mode master responsible for sending ignition switch position information on the class 2 serial data link. There are 3 discrete wires from the ignition switch contacts are monitored by the BCM in order to determine the present power mode. The BCM communicates this power mode information to all class 2 modules on the class 2 serial data link. The following table represents BCM power mode data:

CONDITIONS FOR SETTING THE DTC

Incorrect Power Mode Inputs:

One of the three monitored ignition switch circuits has malfunctioned. Refer to the following example:

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

CONDITIONS FOR CLEARING THE DTC
^ The current DTC B1440 will clear when the BCM no longer detects a power mode malfunction
^ A history DTC clears after 100 malfunction free ignition cycles.

TEST

Steps 1-4:

Steps 5-13:

Steps 14-15: