Circuit/System Testing

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2020 GMC Yukon XL, 2020 GMC Yukon, 2020 Chevrolet Tahoe, 2020 Chevrolet Suburban, and 2020 Cadillac Escalade ESV. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

The Appropriate SAC005 Proactive Alert Labor Code Must be used to accurately process the claim. See Labor Time Guide: "Engine/Propulsion Proactive Alerts".

Verify the customer has the Proactive Alert SAC005 from OnStar or by using the Scan Tool "Vehicle Diagnostics" - "Vehicle Proactive Alerts".
- If Proactive Alert SAC005 is present.
1. Verify the battery cable connections are clean and tight and verify Voltage is between 12.0 - 15.0 V
  - If not within the specified range
    Refer to Battery Inspection/Test
  - Go to next step: If within the specified range
2. Test for less than 0.5 V between the positive battery terminal and positive terminal at the X50D Fuse Block - Battery with the ignition in the CRANK/START position.
  - If 0.5 V or greater
    Replace the positive battery cable.
  - Go to next step: If less than 0.5 V
3. Test for less than 0.5 V between the positive battery cable at the X50D Fuse Block - Battery and terminal 1 X2 or A X2 at the M64 Starter Motor with the ignition in the CRANK/START position.
  - If 0.5 V or greater
    Replace the positive battery cable.
  - Go to next step: If less than 0.5 V
4. Test for less than 0.5 V between the negative battery cable and the M64 Starter Motor case with the ignition in the CRANK/START position.
  - If 0.5 V or greater
    Replace the negative battery cable.
  - Go to next step: If less than 0.5 V
5. Refer to Battery Inspection/Test
  - If Battery Fails the Test
    Replace the C1 battery.
  - Go to next step: If the Battery Passes the Test
6. Replace the M64 Starter Motor.
- Go to next step: If Proactive Alert SAC005 is not present.
All Ok.