GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2005 🢒 CTS 🢒 DTC 🢒 DTC B1327

Circuit Description

The dash integration module (DIM) has an internal voltage sensor with a dedicated circuit that checks the battery positive voltage and battery negative circuit voltage to determine if it is above 9 volts.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B1327 Device Power Circuit Low

Conditions for Running the DTC

This DTC shall run only if the DIM has power, ground and the ignition is not in START mode. This DTC shall execute regardless of the battery voltage, except when the DTC B1390 is set current.

Conditions for Setting the DTC
    • This DTC shall be set as current when the voltage falls below 9 volts for 1200 milliseconds.
    • When the vehicle exits START the DIM shall delay checking the voltage for 2 seconds.

Action Taken When the DTC Sets

A message shall be sent out on the class 2 lines 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 voltage shall be greater than 9.54 volts for 1200 milliseconds.

Test Description

The number below refers to the step number on the diagnostic table.

  1. Compares battery voltage with the voltage that the DIM calculates.

Step

Action

Value(s)

Yes

No

Schematic Reference: Starting and Charging Schematics

Connector End View Reference: Master Electrical Component List

1

Did you perform the Diagnostic System Check - Vehicle?

--

Go to Step 2

Go to Diagnostic System Check - Vehicle

2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the Battery Voltage parameter in the dash integration module (DIM) data list.

Does the scan tool indicate the battery voltage is greater than the specified value?

9.5 V

Go to Step 4

Go to Step 3

3

  1. Measure the voltage across the battery terminals.
  2. Compare the battery voltage with the Battery Voltage parameter in the DIM data list.

Are the voltages within the specified value?

1 V

Go to Battery Inspection/Test

Go to Step 4

4

Inspect for poor connections at the harness connector of the DIM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

--

Go to Step 6

Go to Step 5

5

Replace the DIM. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

--

Go to Step 6

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6
  1. Use the scan tool in order to clear the DTC.
  2. Operate the vehicle within the conditions for running the DTC.

Does the DTC reset?

--

Go to Step 2

System OK