• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Note: For Warranty Repairs — You must use the regionally required battery test equipment refer to Special Tools.

• For 2019 and Newer North American Vehicle only we have am OEM (as built with) reference table available in SI under General Information > General Information > 12 V Battery Usage.
• For accurate test results the battery must be disconnected from the vehicle and the equipment connected directly to the battery posts.
• Failure to obtain the correct connections during the test may result in a failed test on a good battery.
• For Dual Batteries both of the batteries must be disconnected with test equipment connected directly to the posts. Each battery needs to be tested separately.
• For battery replacement warranty claims, the complete 15-character (17 with hyphens) test code from the EL-50313 Midtronics GR8 Battery Tester/Charger or 20-character (no hyphens) test code from the EL-52800 E-XTEQ Diagnostic Charge Battery Station (DCBS) must be included in the Labor Code Dependency field in GWM,

• Setup:
• When using the GR8, Select “Charging,” “Diagnostic” when setting up the test. and then select the correct battery type (Flooded, AGM, or Stop/Start AGM) and rated CCA (both from the battery label) must be entered. Use the Out of Vehicle test (battery disconnected with test equipment connected directly to the posts) for each battery when testing a vehicle with dual batteries.
• When using the DCBS, Select “Diagnostic” and “Trolley”, then scan the VIN and verify the battery selection is correct, or manually select the correct battery type (Flooded or AGM) and rated CCA (both from the battery label).

Note:

• Cold batteries are resistant to charging even when in use on the vehicle. They will not recover quickly in subfreezing temperatures. Releasing a new vehicle with a battery in a low state of charge puts the customer at risk to a no crank event.
• If you suspect that a battery may be frozen, inspect the case for cracks prior to charging. Do not charge a frozen battery.

• When an automotive 12 Volt battery is cold (below freezing), its capacity starts to reduce. This can be observed in the voltage level of the battery, as well as measured cold cranking amps. A cold battery is also resistant to charging. The colder the battery, the more these characteristics are affected.
• Depending how cold a battery is, it can fail testing using any type of battery test equipment.

Starting and Charging Schematics

Master Electrical Component List

Battery Description and Operation

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Control Module References for scan tool information

• GR8 EL–50313 Midtronics Battery Tester/Charger
• DCBS EL–52800 E-XTEQ Diagnostic Charge Battery Station

For equivalent regional tools, refer to Special Tools

1. Verify there is no Battery acid leakage and/or sulfur/acid odor.
• If there is Battery acid leakage and/or sulfur/acid odor

  Ventilate the area prior to servicing, testing or charging the Battery.

• If there is no Battery acid leakage and/or sulfur/acid odor
2. Verify the C1 Battery or C1B Battery – Auxiliary (if equipped) case is not cracked, broken, or damaged, which may be indicated by battery acid leakage and/or Sulfur/Acid Smell.
• If there is any apparent damage

  Replace the appropriate C1 Battery or C1B Battery – Auxiliary.

• If there is no damage
3. Verify that the battery cables are clean and tight. The battery terminal bolts should be torqued as specified in Fastener Specifications.
• If the battery cables need to be cleaned or tightened

  Clean as required and tighten as specified.

• If the battery cables are clean and tight
4. Disconnect battery from the vehicle. There is no need to remove the battery from the vehicle, Refer to:Battery Replacement

Note: Failure to connect the battery tester directly to the Battery Posts may lead to a false test result for a battery that may be good or bad.

5. Connect the EL-50313 directly to the battery terminal posts.
6. Select “Charging,” “Diagnostic” and “Out of Vehicle” when setting up the test.

Note:

• The correct Battery Type MUST be selected when setting up the test. Selecting the incorrect Battery Type may lead to a false “Battery is bad” result for a good battery.
• Battery Type selection START/STOP AGM is ONLY for testing the small Auxiliary battery on some vehicles equipped with Auto Stop/Start (KL9). NOT all vehicles with Auto Stop/Start.
• Do NOT Select Start/Stop AGM for Vehicles equipped with Diesel Engines or Dual Battery Option (K4B) or (TP2).

7. Select the proper battery type: Flooded, AGM or START/STOP AGM.

Note: Always enter the CCA printed on the Battery label even if there is conflicting information. Failure to enter the correct CCA may lead to a false test result for a battery that may be good or bad.

8. Always enter the CCA as shown on the battery label.
9. Verify the test result is not REPLACE BATTERY or BAD CELL-REPLACE
• If the test result is REPLACE BATTERY or BAD CELL-REPLACE

Note: You must provide the Print out of the Warranty Code when a battery is replaced. The printout must be attached to the job card and stored in the dealership’s vehicle history folder. Write the code on the warranty copy since the code must be entered by the warranty administrator in the “Battery Tester Code” Field of the transaction.

Replace the appropriate C1 Battery or C1B Battery – Auxiliary.
• If the test result is not BAD BATTERY or BAD CELL, but the battery requires Charging

  Conduct Battery Charging and Battery Electrical Drain/Parasitic Load Test.

• If Battery is OK and the battery doesn't require Charging
10. The condition is not currently present and may be an intermittent fault. Conduct a Battery Electrical Drain/Parasitic Load Test.

1. Verify there is no Battery acid leakage and/or sulfur/acid odor.
• If there is Battery acid leakage and/or sulfur/acid odor

  Ventilate the area prior to servicing, testing or charging the Battery.

• If there is no Battery acid leakage and/or sulfur/acid odor
2. Verify the C1 Battery or C1B Battery – Auxiliary (if equipped) case is not cracked, broken, or damaged, which may be indicated by battery acid leakage.
• If there is any apparent damage

  Replace the appropriate C1 Battery or C1B Battery – Auxiliary.

• If there is no damage
3. Verify that the battery cables are clean and tight. The battery terminal bolts should be torqued as specified in Fastener Specifications.
• If the battery cables need to be cleaned or tightened

  Clean as required and tighten as specified.

• If the battery cables are clean and tight
4. Disconnect battery from the vehicle. There is no need to remove the battery from the vehicle, Refer to:Battery Replacement
5. Connect the EL-52800 directly to the battery terminal posts.
6. Select “Diagnostic” and “Trolley” when setting up the test.

Note: When using the VIN scan feature you must always verify that the battery label information matches what is auto-populated.

7. Use the VIN Scan feature or select the proper battery type: Flooded, or AGM.
8. Verify the CCA as shown on the battery label.
9. Verify the test result is not “Battery is Bad”.
• If the test result is “Battery is Bad”

Note: You must provide the Print out of the Warranty Code when a battery is replaced. The printout must be attached to the job card and stored in the dealership’s vehicle history folder. Write the code on the warranty copy since the code must be entered by the warranty administrator in the “Battery Tester Code” Field of the transaction.

Replace the appropriate C1 Battery or C1B Battery – Auxiliary.
10. If the test result is not “Battery is Bad”, but the battery requires Charging

    Conduct Battery Charging and Battery Electrical Drain/Parasitic Load Test.

• If “Battery is Good” and the battery doesn't require Charging

  The condition is not currently present and may be an intermittent fault. Conduct a Battery Electrical Drain/Parasitic Load Test.

Perform the Diagnostic Repair Verification after completing the repair.

• Battery Replacement