SDGM

DTC B1380 (SDGM with HP2)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors
DTC B1380 01
- Device Ignition ACCESSORY Circuit Short to Battery

DTC B1380 06
- Device Ignition ACCESSORY Circuit Short to Ground or Open

Diagnostic Fault Information






Circuit/System Description

Modules connected to the high and low speed GMLAN serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. Each message contains the identification number of the transmitter module.

The wake up signal circuit is energized by the body control module (BCM) activate specific modules when the ignition key is in ACC, ON or START. If the serial data gateway module does not receive this signal when the ignition switch is ON DTC B1380 will set in the SDGM along with other DTCs.

Conditions for Running the DTC

* The system voltage is between 9-16 V.
* The ignition switch is ON.

Conditions for Setting the DTC

A short to ground or an open on the wake up signal circuit.

Action Taken When the DTC Sets

The modules is never signaled, therefore the specific subsystems will not function.

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 of 50, without a repeat of the malfunction.

Circuit/System Verification

Verify that DTCs U1814, U1812, and U209A are not set.

If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.