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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 Description

Circuit/System Description

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.

The Tow/Haul Mode indicator bulb on the instrument cluster is supplied 12 volts and ground by the instrument cluster module. When the Tow/Haul mode is selected, the body control module will send a request on the serial data communication line to the instrument cluster module to turn ON the Tow/Haul indicator. Pressing and releasing the Tow/Haul Switch again will turn OFF the indicator and return the transmission to normal shifting.

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