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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 59 (Automatic Transmission Diagnosis - 4L80-E) >> Symptom Tests >> Tow/Haul Switch/Indicator Always On Or Inoperative >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 GMC Yukon XL, 2002 GMC Sierra, 2002 Chevrolet Suburban, and 2002 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The numbers listed below refer to step numbers in the diagnostic procedure:

  1. 2

    This step tests for a faulty tow/haul switch.

  2. 3

    This step tests for voltage input from the BCM to the tow/haul switch.

  3. 6

    This step tests for voltage through the body wiring harness junction block.

  4. 7

    This step tests for ground integrity at the splice pack.

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