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Home >> Chevrolet >> 2002 >> Astro Van Passenger, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 794 (Lighting Systems) >> Diagnostic Information and Procedures >> DTC B2647: Courtesy Lamp Relay Coil Control Circuit Is Open Or Shorted To Ground >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 GMC Safari and 2003 Chevrolet Astro. 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. 3. Tests for the proper operation of the circuit in the low voltage range.
  2. 4. Tests for the proper operation of the circuit in the high voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to ground.
  3. 5. Tests for a short to voltage in the 5 volt reference circuit.
  4. 13. After replacement of the BCM you must calibrate the new module for proper operation.
Fig 1: DTC B2647 (1 Of 2)
G01566149Courtesy of GENERAL MOTORS CORP.
Fig 2: DTC B2647 (2 Of 2)
G01566150Courtesy of GENERAL MOTORS CORP.
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