Test Description

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. 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 low voltage range.
4. Tests for the proper operation of the circuit in the high voltage range. If the jumper fuse opens when you perform this test, the circuit is shorted to ground.
5. Tests for a short to voltage in the 5-volt reference circuit.
6. Tests for a high resistance or for an open in the low reference circuit.

Fig 1: DTC B0229, B0414, B0424, Or B3770 (Steps 1-9)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC B0229, B0414, B0424, Or B3770 (Steps 10-16)

Courtesy of GENERAL MOTORS CORP.