SIR System Diagnosis

Circuit Description
Battery positive voltage (B+) is supplied to the Sensing and Diagnostic Module (SDM) when the ignition switch is in the RUN position via circuit 1139. The SDM learns the source ID of the battery voltage report message. The SDM monitors this message every 300 milliseconds.

Conditions for Setting the DTC
The battery positive voltage (B+) level rises above 15.5 volts for more than approximately 1 second or more.

Action Taken When the DTC Sets
^ Stores a DTC B1328 in the SDM memory.
^ The SDM will not set any communication DTCs.
^ No driver warning message will be displayed for this DTC.

Conditions for Clearing the DTC
The ignition positive voltage level falls below 15 volts for approximately 1 second.

Diagnostic Aids
This DTC may set when the vehicle is placed on a battery charger, on fast charge, for a long period of time.

Test Description
The numbers below refer to the step numbers on the diagnostic table:
1. Perform the entire SIR Diagnostic System Check before continuing with the diagnosis of this DTC.
2. Checks that DTC was not set erroneously.
3. Determines whether the malfunction is in the charging system or the SDM. Diagnostic System Check