LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 1999 >> Corvette 2D Convertible, Automatic >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Body Control Modules >> Diagnostic Tests >> DTC B2648: Ambient Light Sensor Circuit High >> Testing

DTC B2648: Ambient Light Sensor Circuit High: Testing

  1. If BCM diagnostic system check has been performed, go to next step. If BCM diagnostic system check has not been performed, go to BCM DIAGNOSTIC SYSTEM CHECK  under SYSTEM TESTS.
  2. Connect scan tool to Data Link Connector (DLC). Turn ignition on. Use scan tool to select BCM INPUTS and monitor AMBIENT LIGHT SENSOR data. If scan tool displays 0.1-3.9 volts, go to step  6 . If scan tool does not display 0.1-3.9 volts, go to next step.
  3. Disconnect ambient light sensor connector. Ambient light sensor is located on top of the instrument panel in the defroster grille. Using DVOM, measure voltage between ambient light sensor connector terminals "A" (Yellow/Black wire) and "B" (Light Green/Black wire). See WIRING DIAGRAMS  . If reading is 4.5-5.5 volts, go to step  5 . If reading is not 4.5-5.5 volts, go to next step.
  4. Check for short to voltage in Light Green/Black or Yellow/Black wires between BCM and ambient light sensor. If faulty circuit is repaired, go to step  9 . If circuit is okay, go to step  8 .
  5. Replace ambient light sensor. After repairs, go to step  9 .
  6. Check for intermittent malfunction in ambient light sensor circuit. See DIAGNOSTIC AIDS  . If faulty circuit is repaired, go to step  9 . If circuit is okay, go to next step.
  7. Turn ignition off. Reinstall all components and connectors. Turn ignition on. Clear DTCs. Recheck for DTCs. If DTC B2648 is current, go to next step. If DTC B2648 is not current, system is operating properly.
  8. Replace BCM and program. See BODY CONTROL MODULE (BCM)  under REMOVAL & INSTALLATION. See BCM PROGRAMMING/RPO CONFIGURATION  under PROGRAMMING. After repairs, go to next step.
  9. Turn ignition off. Reinstall all components and connectors. Turn ignition on. Clear DTCs. Perform BCM DIAGNOSTIC SYSTEM CHECK  under SYSTEM TESTS.
scientia non olet · About LEMON Manuals