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DTC B1327: Device Power Circuit Low: Testing

  1. If starting and charging system diagnostic system check has been performed, go to next step. If starting and charging system diagnostic system check has not been performed, go to DIAGNOSTIC SYSTEM CHECK in GENERATORS & REGULATORS - DEVILLE article in STARTING & CHARGING SYSTEMS.
  2. Connect scan tool to Data Link Connector. See Figure . Turn ignition on. Using scan tool, monitor battery voltage parameter in Dash Integration Module (DIM) data list. If voltage is less than 9.4 volts, go to next step. If voltage is greater than 9.4 volts, go to step  5 .
  3. Turn ignition off. Disconnect the DIM connectors. See Figure . Turn ignition on. Using DVOM, measure voltage between DIM connector C3 terminals A12 (Orange wire) and B12 (Black wire). See Figure . If voltage is less than 9.4 volts, go to next step. If voltage is greater than 9.4 volts, go to step  10 .
  4. Measure voltage between ground and DIM connector C3 terminal A12 (Orange wire). If voltage is less than 9.4 volts, go to step  8 . If voltage is greater than 9.4 volts, go to step  9 .
  5. Using scan tool, monitor battery voltage parameter in data list of module setting DTC B1327. If voltage is less than 9.4 volts, go to next step. If voltage is greater than 9.4 volts, check for intermittent or poor connections at DIM.
  6. Turn ignition off. Disconnect module setting DTC B1327. See COMPONENT LOCATIONS  . Using DVOM, measure voltage between battery positive voltage circuit terminal and ground circuit terminal of module connector setting DTC B1327. If voltage is less than 9.4 volts, go to next step. If voltage is greater than 9.4 volts, go to step  10 .
  7. Measure voltage between battery positive voltage circuit terminal of module setting DTC B1327 and ground. If voltage is less than 9.4 volts, go to next step. If voltage is greater than 9.4 volts, go to step  9 .
  8. Check voltage sense circuit of module setting DTC B1327 for open or high resistance. If circuit is okay, go to step  10 . If faulty circuit is found and repaired, go to step  12 .
  9. Check ground circuit of module setting DTC B1327 for open or high resistance. If circuit is okay, go to step  10 . If faulty circuit is found and repaired, go to step  12 .
  10. Check for poor connections at module setting DTC B1327. If connections are okay, go to next step. If faulty connection is found and repaired, go to step  12 .
  11. Replace module setting DTC B1327. See appropriate procedure under REMOVAL & INSTALLATION  . After repairs, go to next step.
  12. Use scan tool to clear DTCs. Operate vehicle and recheck for DTCs. If DTC B1327 resets, go to step  2 . If DTC does not reset, system is okay at this time.
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