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Home >> GMC >> 2019 >> Terrain SL >> Repair and Diagnosis >> External Pages >> Different car >> Section 137 (Cellular System, Entertainment System, And Navigation System - Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> OnStar Button LED Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2018 GMC Terrain and 2018 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.

Green LED Test

  1. Vehicle OFF/Ignition OFF, and all vehicle systems OFF, disconnect the harness connector at the A98 Front Overhead Console. It may take up to 2 min for all vehicle systems to power down. Doors closed, courtesy lamps OFF.
  2. Test for less than 10 Ω between the ground circuit terminal 5 and ground.
    • If 10 Ω or greater 
    1. Vehicle OFF/Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 Ω 
  3. Vehicle in Service Mode/Ignition ON.
  4. Test for less than 1 V between the control circuit terminal 15 and ground while commanding the Green Indicator OFF with a scan tool.
    • If 1 V or greater 
    1. Vehicle OFF/Ignition OFF, disconnect the X1 harness connector at the K73 Telematics Communication Interface Control Module, vehicle in Service Mode/Ignition ON.
    2. Test for less than 1 V between the control circuit terminal 15 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K73 Telematics Communication Interface Control Module.
    • Go to next step: If less than 1 V 
  5. Test for greater than 8 V between the control circuit terminal 15 and ground while commanding the Green Indicator ON with a scan tool.
    • If 8 V or less 
    1. Vehicle OFF/Ignition OFF, disconnect the X1 harness connector at the K73 Telematics Communication Interface Control Module.
    2. Test for infinite resistance between the control circuit terminal 15 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K73 Telematics Communication Interface Control Module.
    • Go to next step: If greater than 8 V 
  6. Test or replace the A98 Front Overhead Console.

Red LED Test

  1. Vehicle OFF/Ignition OFF, and all vehicle systems OFF, disconnect the harness connector at the A98 Front Overhead Console. It may take up to 2 min for all vehicle systems to power down. Doors closed, courtesy lamps OFF.
  2. Test for less than 10 Ω between the ground circuit terminal 5 and ground.
    • If 10 Ω or greater 
    1. Vehicle OFF/Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 Ω 
  3. Vehicle in Service Mode/Ignition ON.
  4. Test for less than 1 V between the control circuit terminal 14 and ground while commanding the Red Indicator OFF with a scan tool.
    • If 1 V or greater 
    1. Vehicle OFF/Ignition OFF, disconnect the X1 harness connector at the K73 Telematics Communication Interface Control Module, vehicle in Service Mode/Ignition ON.
    2. Test for less than 1 V between the control circuit terminal 14 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K73 Telematics Communication Interface Control Module.
    • Go to next step: If less than 1 V 
  5. Test for greater than 8 V between the control circuit terminal 14 and ground while commanding the Red Indicator ON with a scan tool.
    • If 8 V or less 
    1. Vehicle OFF/Ignition OFF, disconnect the X1 harness connector at the K73 Telematics Communication Interface Control Module.
    2. Test for infinite resistance between the control circuit terminal 14 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K73 Telematics Communication Interface Control Module.
    • Go to next step: If greater than 8 V 
  6. Test or replace the A98 Front Overhead Console.
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