Proactive Alert Identifier SAC002

Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis Diagnostic Procedure Instructions provides an overview of each diagnostic category. Proactive Alert Identifier Descriptor Proactive Alert Identifier Service Message Identifier SAC002 Predicted Starting and Charging — Low Cranking Capability Due to High Resistance. Conditions for Running the Proactive Alert Identifier Service message present. Conditions for Setting the Proactive Alert Identifier Low Cranking Capability Due to High Resistance Diagnostic Aids It is possible to have more than one component fault, all components listed need to be tested. OBD system DTCs may have set as a result of a low voltage condition. The DTCs need to be cleared with the scan tool. If the customer cannot provide the Proactive Alert, it can be obtained through Service Workbench Alerts. Reference Information Schematic Reference Starting and Charging Schematics Description and Operation Proactive Alerts Description and Operation Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Special Tools Equivalent regional tools Special Tools Circuit/System Verification

Note

If the concern is still present after following the steps for Diagnostics in any of the Proactive Alert Identifiers, contact GM TAC for further assistance. The GM TAC Agent will arrange for the stuck Proactive Alert to be cleared from OnStar Back Office.

1. Verify the battery cable connections are clean and tight and verify battery voltage is between 12.0–15.0 V measured at the battery terminals. ⇒ If not within the specified range Refer to Battery Inspection/Test ⇓ If within the specified range
2. Verify the customer has the Proactive Alert SAC002 from OnStar, or by using the Scan Tool “Vehicle Diagnostics” » “Vehicle Proactive Alerts”, or Service Workbench Alerts. ⇒ If Proactive Alert SAC002 is present. Refer to Circuit/System Testing. ⇓ If Proactive Alert SAC002 is not present.
3. All OK. Circuit/System Testing
4. Test for the following values at each test location: Test for less than the 500 mV drop between the C1 Battery Positive Post and the X50D  Fuse Block—Battery with the ignition in CRANK/START. Test for less than 500 mV drop between X50D Fuse Block—Battery and terminal A X2 at the M64 Starter Motor with the ignition in CRANK/START. Test for less than 500 mV drop between negative battery cable and the M64 Starter Motor Case with the ignition in CRANK/START. ⇒ If 500 mV or greater between the C1 Battery Positive Post and the X50D Fuse Block— Battery Replace the X50D Fuse Block—Battery and continue testing voltage drop at all other cables. ⇒ If 500 mV or greater between at the X50D Fuse Block—Battery and terminal A X2 at the M64 Starter Motor Replace the battery starter cable between the X50D Fuse Block—Battery and M64 Starter Motor and continue testing voltage drop at all other cables. ⇒ If 500 mV or greater between negative battery cable and the M64 Starter Motor Case Replace the Battery Negative Cable. and continue testing voltage drop at all other cables.
5. Clear the Proactive Alert Using the Scan Tool “Vehicle Diagnostics” » “Vehicle Proactive Alerts”. ⇓ If all tests are less than the specific value
6. Test the Battery. Refer to Battery Inspection/Test ⇒ If the C1 Battery Fails the Test Replace the C1 Battery
7. Clear the Proactive Alert Using the Scan Tool “Vehicle Diagnostics” » “Vehicle Proactive Alerts”. ⇓ If the C1 Battery Passes the Test
8. The condition is currently not present and may be an intermittent fault. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Battery Replacement Battery Positive and Negative Cable Strap Replacement Starter Solenoid Cable Replacement Engine Wiring Harness Junction Block Replacement