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Test Procedure

  1. Did you perform the Battery Inspection/Test? If yes, go to next step. If no, go to BATTERY TESTING & INSPECTION under ON-VEHICLE TESTING in GENERATORS & REGULATORS article in CHARGING SYSTEM in ELECTRICAL.
  2. Install a scan tool. Does the scan tool power up? If yes, go to next step. If no, go to BODY CONTROL MODULES article in COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT.
    NOTE: The engine may start during the following step.
  3. Turn OFF the engine as soon as you have observed the Crank power mode. Access the Class 2 Power Mode in the Diagnostic Circuit Check on the scan tool. Rotate the ignition switch through all positions while observing the Class 2 Power Mode on the Scan Tool. For a list of the power mode states that correspond to each ignition switch position, go to BODY CONTROL MODULES article in COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT. Does the Class 2 Power Mode parameter reading match the ignition switch position for all the selected positions? If yes, go to next step. If no, go to BODY CONTROL MODULES article in COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT.
  4. Turn ON the ignition, with the engine OFF. Attempt to communicate with each module on the class 2 serial data circuit. If using a Tech 2, obtain this information using the class 2 Message Monitor feature. Does the scan tool communicate with any module on the class 2 serial data circuit? If yes, go to next step. If no, go to BODY CONTROL MODULES article in COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT.
  5. Select the Display DTCs function for each module. If using a Tech 2, use the Class 2 DTC Check feature in order to determine which modules have DTCs set. Record all of the displayed DTCs the DTC status and the module which set the DTC. Does the scan tool display any DTCs? If yes, go to next step. If no, go to SYMPTOMS - ENGINE ELECTRICAL  .
  6. Does the scan tool display any DTC beginning with "U"? If yes, go to BODY CONTROL MODULES article in COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT. If no, go to next step.
  7. Does the scan tool display any DTC beginning with "P"? If yes, go to appropriate article, refer to the following: If no, go to next step.
  8. Does the scan tool display any DTC beginning with "B"? If yes, go to BODY CONTROL MODULES article in COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT. If no, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS under SELF-DIAGNOSTIC SYSTEM in GENERATORS & REGULATORS article in CHARGING SYSTEM in ELECTRICAL.
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