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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 18 (Lighting System) >> Diagnostic Information and Procedures >> Turn Signal Lamps and/or Indicators Malfunction >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

Ground is applied at all times to the turn signal/multifunction switch. The turn signal lamps may only be activated with the ignition switch in the ON or START position. When the turn signal/multifunction switch is placed in either the left or right turn position, ground is applied through the respective left or right turn signal switch signal circuit to the body control module (BCM). The BCM then applies a pulsating voltage to the front and rear turn signal lamps through there respective voltage supply circuits. At the same time, the BCM sends a serial data message to the instrument panel cluster (IPC) requesting the respective turn signal indicator be pulsed.

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