B1327

DTC B1327

Circuit Description

The radio has an internal voltage sensor with a dedicated circuit that measures the battery voltage to determine if it is above 9.0 volts.

DTC Descriptor

This diagnostic procedures supports the following DTC:

DTC B1327 Device Power 1 Circuit Low

Conditions for Running the DTC

This DTC shall run only if the radio has power and ground, and the ignition is not in START mode. This DTC shall execute regardless of the battery voltage.

Conditions for Setting the DTC

* This DTC shall be set as current when the voltage falls below 9.0 volts for 1,200 milliseconds.
* When the vehicle exits START the radio shall delay checking the voltage for 2 seconds.

Action Taken When the DTC Sets

* The BCM will not illuminate the charge indicator.
* A message shall be sent out to notify all other modules of low battery voltage.

Conditions for Clearing the MIL/DTC

In order to clear the DTC from a current status the ignition must be cycled and the voltage shall be greater than 9.0 volts.

Test Description

Step 1 - Step 7:

The number below refers to the step number on the diagnostic table.
3. This step compares battery voltage with the voltage that the radio calculates.