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DTC B2605: Seat Front Vertical Position Sensor Failure (SCM): Testing

WARNING: This page is about a different car, the 2000 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
  1. If diagnostic system check was performed, go to next step. If diagnostic system check has not been performed, go to DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Using scan tool, display SCM DTCs. If DTC B2605 is set as history, go to next step. If DTC B2605 is not set as history, go to step  6 .
  3. Using scan tool, monitor SCM data display for left seat front vertical position sensor. Attempt to operate front of left seat using power seat switch. If scan tool does not display 0.10-4.78 volts, go to next step. If scan tool displays 0.10-4.78 volts, go to step  12 .
  4. Turn ignition off. Disconnect left seat lower motor connector C3. Turn ignition on. Using DVOM, measure voltage between left seat lower motor connector C3 terminal "C" (Purple wire) and ground. See Figure . If voltage is 4.0-5.5 volts, go to next step. If voltage is not 4.5-5.5 volts, go to step  7 .
  5. Measure voltage between left seat lower motor connector C3 terminals "A" (Black wire) and "C" (Purple wire). If voltage is not 4.0-5.5 volts, go to step  8 . If voltage is 4.0-5.5 volts, go to step  10 .
  6. Turn ignition off. Disconnect left seat lower motor connector C3. Turn ignition on. Using DVOM, measure voltage between left seat motor connector C3 terminal "B" (Brown/White wire) and ground while operating front of left seat using power seat switch. If voltage is not 3.5-5.5 volts, go to step  9 . If voltage is 3.5-5.5 volts, go to step  10 .
  7. Check for open, short to ground or short to voltage in Purple wire between left seat lower motor connector C3 and SCM connector C1. If circuit is okay, go to step  11 . If faulty circuit s found and repaired, go to step  14 .
  8. Check for open or short to voltage in Black wire between left seat lower motor connector C3 and SCM connector C1. If circuit is okay, go to step  11 . If faulty circuit s found and repaired, go to step  14 .
  9. Check for open, short to ground or short to voltage in Brown/White wire between left seat lower motor connector C3 and SCM connector C1. If circuit is okay, go to step  11 . If faulty circuit s found and repaired, go to step  14 .
  10. Replace left seat adjuster motor assembly. See POWER SEATS - CORVETTE article. After repairs, go to step  14 .
  11. Replace SCM. See SEAT CONTROL MODULE  under REMOVAL & INSTALLATION. After repairs, go to step  14 .
  12. Check left seat front vertical position sensor wiring and connectors for intermittent malfunctions. See WIRING DIAGRAMS  . If problem is not found, go to next step. If problem circuit or connector is repaired, go to step  14 .
  13. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear any DTCs. Wait 2 seconds. If DTC B2605 sets as history, go to step  11 . If DTC B2605 does not set as history, system is okay at this time.
  14. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on and clear any DTCs. If DTC resets, go to DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
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