GM Service Manual Online
For 1990-2009 cars only

Circuit Description

The voltage level is monitored by the dash integration module (DIM) and is sent as a class 2 data message to the instrument panel cluster (IPC). If the DIM loses power the IPC will default to the last voltage level.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B1513 Charging System Volts Low

Conditions for Running the DTC

    • The key is in the ON position.
    • The engine is running.
    • DTC B1327 is not current.

Conditions for Setting the DTC

This DTC will be set as current when the voltage falls below 10.5 volts for 30 seconds and the engine is running.

Action Taken When the DTC Sets

The charging system indicator message will be set in the driver information center (DIC) W/U50 only.

Conditions for Clearing the MIL/DTC

The DTC clears as a current status when the voltage is greater than 10.5 volts for 30 seconds with the engine running.

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check - Vehicle?

--

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

  1. Install a scan tool.
  2. Start the engine.
  3. Allow voltage to stabilize.
  4. With a scan tool observe the Battery Volts parameter in the instrument panel cluster (IPC) data list using the scan tool.

Does the scan tool indicate that the volts parameter is within the specified range?

10.5-16.2 V

Go to Step 3

Go to Charging System Test

3

Replace the IPC. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

--

Go to Step 4

--

4

  1. Use the scan tool in order to clear the DTC.
  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