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Scan Tool Inoperative

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1999 Oldsmobile Bravada, 1999 GMC Sonoma, 1999 GMC Jimmy, 1999 GMC Envoy, and 1999 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove scan tool from Data Link Connector (DLC). Connect test light between ground and DLC terminal No. 16 (Orange wire). See WIRING DIAGRAMS  . Also see appropriate wiring diagram in DATA LINK CONNECTORS article in WIRING DIAGRAMS. If test light comes on, go to step 3). If test light does not come on, go to next step.
  2. Repair open in Orange wire between DLC and CIGAR LTR fuse (15-amp), located in instrument panel fuse block. Reconnect scan tool. If scan tool does not power up, go to next step.
  3. Connect test light between DLC terminals No. 5 (Black/White wire) and No. 16 (Orange wire). If test light comes on, go to step 5). If test light does not come on, go to next step.
  4. Repair open in Black/White wire between left instrument panel junction block and DLC. Reconnect scan tool. If scan tool does not power up, go to next step.
  5. Connect test light between DLC terminals No. 4 (Black wire) and No. 16 (Orange wire). If test light comes on, go to next step. If test light does not come on, go to step 7).
  6. Scan tool may be inoperative. Check scan tool operator's manual.
  7. Repair open in Black wire between DLC and ground. Reconnect scan tool. If scan tool does not power up, go to step 6).