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Test Description

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  1. Perform battery inspection test. See BATTERY INSPECTION/TEST (NON-HP2)  under ON-VEHICLE TESTING. If problem exists, repair as necessary. If problem does not exist, go to next step.
  2. Connect scan tool to Data Link Connector (DLC). Turn ignition switch to RUN position. If scan tool powers up, go to next step. If scan tool does not power up, repair as necessary. See BODY CONTROL MODULES .
  3. Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The following procedure will determine the particular condition. Using scan tool, attempt communication with the powertrain control module (PCM) on class 2 serial data circuit. If scan tool communicates with any module, go to next step. If scan tool does not communicate with any module, repair communications concern. See BODY CONTROL MODULES .
  4. The symptom list in Symptoms will determine the correct diagnostic procedure to use. Using scan tool, select DISPLAY DTCs function for each module. Record all displayed DTCs, DTC status, and module which set the DTC. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair starting system by symptom. See SYMPTOM LIST  table.
  5. The presence of DTCs which begin with "U" indicate some other module is not communicating. The following procedure will compile all the available information before tests are performed. If scan tool displays DTCs which begin with "U", perform appropriate test. See BODY CONTROL MODULES . If scan tool does not display DTCs which begin with "U", perform appropriate test. See BODY CONTROL MODULES .
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