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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.

  1. 3. Tests for the proper operation of the circuit in the high voltage range.
  2. 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 voltage.
  3. 5. Tests for a short to ground in the 5-volt reference circuit.
    Fig 1: DTC C0186 (Steps 1-5)
    G01479900Courtesy of GENERAL MOTORS CORP.
Fig 2: DTC C0186 (Steps 6-15)
G01479901Courtesy of GENERAL MOTORS CORP.
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