Theft Deterrent System Diagnosis

DTC B1327 Battery/Source Voltage Low:

CIRCUIT DESCRIPTION
Battery positive voltage (B+) is supplied to the Theft Deterrent (VTD) Module at connector terminal A, CKT 240 (ORN). The VTD module monitors this voltage to determine if it is within a valid operating range.

CONDITIONS FOR SETTING DTC
The battery positive voltage (B+) level falls below 9 volts for approximately 1.2 seconds or more.

ACTION TAKEN WHEN THE DTC SETS
^ Stores a DTC B1327 in the VTD module memory.
^ The VTD module will not respond to any manual or memory inputs when the voltage is less than 9 volts
^ No driver warning message will be displayed for this DTC.
^ No other VTD module DTCs will not set while DTC B1327 is current.

CONDITIONS FOR CLEARING DTC
^ The battery positive voltage (B+) level rises above 9.5 volts for approximately 1.2 seconds.
^ A history DTC will clear after 50 consecutive ignition cycles if the condition for the malfunction is no longer present.
^ Use the On-Boards clearing DTCs feature.
^ Use a scan tool.

DIAGNOSTIC AIDS
The VTD module will not check for low battery positive voltage (B+) during and for 2 seconds following the engine CRANK mode, this insures that DTC B1327 will not erroneously set.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table:
1. Perform the Theft Deterrent System 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 VTD module.
5. Clear all DTCs after the repair procedure is complete.