Test Description

WARNING: This page is about a different car, the 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. 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.

2. Tests the transfer case electrical control of the lamp circuits.
3. Helps determine module failures.
4. Tests the effected lamp circuit for an open or high resistance.
5. Tests the lamp feed circuit for an open or short to ground.

Fig 1: Transfer Case Shift Control Switch Indicator Inoperative - One Or More

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