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Home >> Chevrolet >> 2019 >> Bolt EV Premier >> Repair and Diagnosis >> External Pages >> Different car >> Section 1 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> OnStar Button LED Malfunction >> Circuit/System Testing

Circuit/System Testing

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

Green Indicator - Test

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: @ S51 Telematics Button Assembly
  3. Test for less than 10 ohms between the test points: Terminal 6 & Ground
    • If 10 ohms or greater 
    1. Test for less than 2 ohms between the test points: Terminal 6 & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 ohms 
  4. Ignition - On/Vehicle - In Service Mode
  5. With Scan Tool - Green Indicator Command - OFF Test for less than 1 V between the test points: Control Circuit Terminal 4 & Ground
    • If 1 V or greater 
    1. Ignition/Vehicle & All vehicle systems - Off
    2. Disconnect the electrical connector: X1 @ K73 Telematics Communication Interface Control Module - Ignition - On/Vehicle - In Service Mode
    3. Test for less than 1 V between the test points: Control Circuit Terminal 4 & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: K73 Telematics Communication Interface Control Module
    • Go to next step: If less than 1 V 
  6. With Scan Tool - Green Indicator Command - ON Test for greater than 8 V between the test points: Control Circuit Terminal 4 & Ground
    • If 8 V or less 
    1. Ignition/Vehicle & All vehicle systems - Off
    2. Disconnect the electrical connector: X1 @ K73 Telematics Communication Interface Control Module
    3. Test for infinite resistance between the test points: Control Circuit & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for less than 2 ohms between the test points: Control Circuit Terminal 4 & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K73 Telematics Communication Interface Control Module
    • Go to next step: If greater than 8 V 
  7. Test or replace the component: S51 Telematics Button Assembly

Red Indicator - Test

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: @ S51 Telematics Button Assembly
  3. Test for less than 10 ohms between the test points: Terminal 6 & Ground
    • If 10 ohms or greater 
    1. Test for less than 2 ohms between the test points: Terminal 6 & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 ohms 
  4. Ignition - On/Vehicle - In Service Mode
  5. With Scan Tool - Red Indicator Command - OFF Test for less than 1 V between the test points: Control Circuit Terminal 5 & Ground
    • If 1 V or greater 
    1. Ignition/Vehicle & All vehicle systems - Off
    2. Disconnect the electrical connector: X1 @ K73 Telematics Communication Interface Control Module - Ignition - On/Vehicle - In Service Mode
    3. Test for less than 1 V between the test points: Control Circuit Terminal 5 & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: K73 Telematics Communication Interface Control Module
    • Go to next step: If less than 1 V 
  6. With Scan Tool - Red Indicator Command - ON Test for greater than 8 V between the test points: Control Circuit Terminal 5 & Ground
    • If 8 V or less 
    1. Ignition/Vehicle & All vehicle systems - Off
    2. Disconnect the electrical connector: X1 @ K73 Telematics Communication Interface Control Module
    3. Test for infinite resistance between the test points: Control Circuit & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for less than 2 ohms between the test points: Control Circuit Terminal 5 & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K73 Telematics Communication Interface Control Module
    • Go to next step: If greater than 8 V 
  7. Test or replace the component: S51 Telematics Button Assembly
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