Diagnostic System Check
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2000 GMC Yukon XL, 2000 GMC Yukon, 2000 GMC Sierra, 2000 Chevrolet Tahoe, and 2000 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.
- 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 appropriate BODY CONTROL MODULES article.
- 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 appropriate BODY CONTROL MODULES article.
- 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 .
- 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 appropriate BODY CONTROL MODULES article.
- If scan tool displays DTC B3102, see DTC B3102: KEYLESS ENTRY DATA LINK CIRCUIT LOW . If scan tool displays any other DTC, see appropriate BODY CONTROL MODULES article.