GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Cobalt 🢒 Accessories 🢒 Entertainment 🢒 DTC B1001

Circuit Description

The radio receives GMLAN messages, containing VIN digits 3 and 4, when the ignition cycles from OFF to ON and the radio is active. The specific VIN data is sent from another module on the GMLAN serial data circuit. The VIN data needs to match the calibration platform ID stored in the radio memory in order for the radio to operate normally.

DTC Descriptor

This diagnostic procedure supports the following DTC:

B1001 Option Configuration Error

DTC Symptom

DTC Symptom Descriptor

00

No Additional Information

Conditions for Running the DTC

The following conditions must be present in order for the radio to enable the diagnostics:

    • The radio transitions from OFF to ON. This maybe in response to the radio power switch or an ignition key cycle.
    • The system voltage is at least 9.0 volts and no more than 16.0 volts.

Conditions for Setting the DTC

The radio detects the calibration platform ID does not match the VIN data sent to the radio with GMLAN messages.

Action Taken When the DTC Sets

The radio does not function properly. The radio displays "CALIBRATE".

Conditions for Clearing the DTC
    • The conditions for setting the DTC are no longer present.
    • A history DTC clears after 100 malfunction-free ignition cycles.
    • The radio receives the clear code command from the scan tool.

Test Description

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

  1. Clear all DTCs and cycle the ignition to verify that the DTC did not falsely set.

    2.

  2. Clear all DTCs after the repair procedure is complete.

Step

Action

Yes

No

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 the scan tool, perform the VIN relearn procedure. On the scan tool, go to Module Replacement/Setup in Vehicle Control Systems select Radio.
  4. Turn OFF the ignition.
  5. Turn ON the ignition, with the engine OFF.

Does the DTC reset?

Go to Step 3

System OK

3

  1. Replace the radio. Refer to Radio Replacement for service procedure.
  2. Perform the VIN Relearn procedure with a scan tool. On the scan tool, go to Module Replacement/Setup in Vehicle Control Systems and select Radio.

Did you complete the replacement?

Go to Step 4

--

4

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2