GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2002 🢒 Rendezvous - FWD 🢒 Engine 🢒 Engine Electrical 🢒 DTC B1327

Circuit Description

The BCM monitors the battery positive voltage and battery negative circuit voltage to determine if it is between 9.0-15.0 volts and sends this information out as a class 2 message to the VTD.

Conditions for Running the DTC

This DTC shall run only if the BCM has power, ground and the ignition in not in START mode.

Conditions for Setting the DTC

This DTC shall be set as current when the voltage falls below 9.0 volts for 1.2 milliseconds.

Action Taken When the DTC Sets

A message shall be sent out on the class 2 lines to illuminate the charge indicator and security lamp.

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 numbers below refer to the step numbers on the diagnostic table.

  1. Tests for the proper operation of the complete circuit.

    2.

  2. Tests for the proper operation of the signal input circuit.

Step

Action

Value(s)

Yes

No

Schematic Reference: Body Control System Schematics in Body Control System

1

Did you perform the Engine Electrical Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Engine Electrical

2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the Electronic Battery FD in the BCM data list.

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

9.0 volts

Go to Step 3

Go to Charging System Test

3

Replace the BCM. Refer to Body Control Module Replacement in Body Control System.

Did you complete the replacement?

--

Go to Step 4

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4

  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

--

Go to Step 2

System OK