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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 >> Circuit/System Verification

Circuit/System Verification

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, monitor the instrument cluster.
  2. Ignition ON, verify the Tow/Haul mode indicator momentarily illuminates, during the instrument cluster bulb check.
    • If the Tow/Haul indicator does not illuminate or is always ON 

      Refer to Circuit/System Testing.

    • Go to next step: If the Tow/Haul indicator does illuminate and is not always ON 
  3. Verify with a scan tool the Tow/Haul switch parameter changes from Inactive to Active and back to Inactive with each cycle of the switch.
    • If the parameter does not change states 

      Refer to Circuit/System Testing.

    • Go to next step: If the parameter does change states 
  4. Verify the Tow/Haul indicator on the instrument cluster turns ON and OFF with each switch activation.
    • If the indicator does not turn ON and OFF 

      Refer to Circuit/System Testing.

    • Go to next step: If the indicator turns ON and OFF 
  5. All OK.
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