B1377

DTC B1377

CIRCUIT DESCRIPTION

Correct Ignition Switch Input Signals:

The body control module (BCM) is the power mode master responsible for sending the power mode message on the data buses. The BCM monitors Ignition 1 (Run/Crank), Ignition 2 (Acc/Run) and Ignition 3 (Run) signals from the ignition switch, and the engine run flag (ERF) in order to determine the present power mode. The following table represents correct BCM input signals corresponding to each ignition switch position.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTCs:
- DTC B1377 Device Ignition 3 (ON) Circuit Low
- DTC B1378 Device Ignition 3 (ON) Circuit High

CONDITIONS FOR RUNNING THE DTC
The only requirements are voltage and ground.

CONDITIONS FOR SETTING THE DTC




The table describes the setting of the DTCs.

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 10:

Step 11 - Step 15: