Test Description

WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. 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.

3. Tests for the proper operation of the circuit in the high voltage range.
4. Tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to battery positive voltage.

Fig 1: DTC B2648 (Steps 1 - 3)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC B2648 (Steps 4 - 12)

Courtesy of GENERAL MOTORS CORP.