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Diagnostic System Check

  1. Install scan tool. If scan tool powers up, go to next step. If scan tool does not power up, see SCAN TOOL DOES NOT POWER UP in BODY CONTROL MODULES - ASTRO & SAFARI article.
  2. Turn ignition on, engine off. Try to establish scan tool communication with Body Control Module (BCM). If communication with BCM is established, go to next step. If communication with BCM is not established, see SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in BODY CONTROL MODULES - ASTRO & SAFARI article.
  3. Select display DTC function for BCM. Record all displayed DTCs and status of displayed DTCs. If DTCs are displayed, go to next step. If no DTCs are displayed, see SYMPTOM TESTS  .
  4. If scan tool does not display DTCs beginning with "U", go to next step. If scan tool displays DTCs beginning with "U", see SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in BODY CONTROL MODULES - ASTRO & SAFARI article.
  5. If scan tool displays DTC B3102, see DTC B3102: KEYLESS ENTRY DATA LINK CIRCUIT LOW  . If scan tool displays any other DTCs, see appropriate BODY CONTROL MODULES - ASTRO & SAFARI article.
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