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 looses power the IPC will failsoft to the last voltage level.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B1514 Charging System Volts High

Conditions for Running the DTC

    • The key is in the ON position.
    • The engine is running.

Conditions for Setting the DTC

This DTC will be set as current when the voltage is greater than 16.2 volts for 30 seconds with the engine running.

Action Taken When the DTC Sets

The charging system telltale and driver warning message will be set in the driver information center (DIC).

Conditions for Clearing the MIL/DTC

The DTC clears as a current status when the voltage falls below 16.2 volts for 30 seconds with the engine running.

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check - Vehicle?

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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 Voltage 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?

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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?

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Go to Step 2

System OK