B1440
CIRCUIT DESCRIPTIONCorrect 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 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 1-3:
Steps 4-10:
Steps 11-15:
