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Home >> Cadillac >> 2018 >> Escalade Base, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 21 (Automatic Transmission - 8L90 (M5U) - Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> Tow/Haul Switch/Indicator Malfunction >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2018 Chevrolet Suburban 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition Off, disconnect the harness connector at the S3 Transmission Shift Lever.
  2. Test for infinite resistance between terminal 1 and terminal 2 of the S3 Transmission Shift Lever.
    • If less than infinite resistance 

      Replace the S3 Transmission Shift Lever.

    • Go to next step: If infinite resistance 
  3. Test for less than 1 Ω between terminal 1 and terminal 2 of the S3 Transmission Shift Lever, while holding down the S74 Tow/Haul Mode Switch.
    • If 1 Ω or greater 

      Replace the S3 Transmission Shift Lever.

    • Go to next step: If less than 1 Ω 
  4. All OK.
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