B1440

DTC B1440

CIRCUIT DESCRIPTION




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 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 table represents BCM power mode data.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B1440 Power Mode Master Input Circuits Mismatch

CONDITIONS FOR SETTING THE DTC




One of the 3 monitored ignition switch circuits has malfunctioned. Refer to shown the 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
- 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.

TEST

Steps 1-7:

Steps 8-15: