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 following 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 the following example:





Action Taken When the DTC Sets

* The BCM implements default actions for each ignition switch position when faults are detected.
* The Service Engine Soon (SES) Light will illuminate.

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

Step 1 - Step 7:

Step 8 - Step 15: