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Scan Tool Does Not Power Up

  1. Check for battery voltage at DLC terminal No. 16 (Orange wire). If battery voltage is present, go to next step. If battery voltage is not present, repair open or short to ground in Orange wire between underhood fuse block ALDL fuse (10-amp) and DLC. After repairs, go to BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK  . If referred from another article, return to that article and perform diagnostic system check.
  2. Check for open in Black wire between DLC terminal No. 4 and ground. If ground circuit is okay, go to next step. If faulty circuit is found, repair Black wire as necessary. After repairs, go to BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK  . If referred from another article, return to that article and perform diagnostic system check.
  3. Check for poor connections between scan tool and DLC terminals No. 4 and 16. If connections are okay, go to next step. If poor connections are found, repair as necessary. After repairs, go to BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK  . If referred from another article, return to that article and perform diagnostic system check.
  4. Scan tool may be malfunctioning. Check scan tool manual for diagnostic procedures. After repairs, go to BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK  . If referred from another article, return to that article and perform diagnostic system check.
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