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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1087 (Entertainment System) >> Diagnostic Information and Procedures >> DTC B1780: Theft Locked >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 2:  Clear all DTCs and radio theft information. Cycle the ignition in order for the radio to learn the VIN.
  2. 3:  Clear all DTCs after the repair procedure is complete.
DTC B1780

Step Action Yes No
1 Did you perform the Radio/Audio System Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Entertainment System 
2 
  1. Install a scan tool.
  2. Use the scan tool in order to clear the DTCs.
  3. With the scan tool clear the radio theft information.
  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 
IMPORTANT: Perform the setup procedure for the radio.
Replace the radio. Refer to Radio Replacement  for service procedure.Did you complete the replacement?		 System OK -
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