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Pinpoint Test O : DTC B2486

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  1. WARNING: Incorrect repair techniques or actions can cause an accidental Supplemental Restraint System (SRS) deployment. Never compromise or depart from these instructions. Failure to precisely follow all instructions could result in serious personal injury from an accidental deployment.

  2. O1 RETRIEVE ALL CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS) IN ALL MODULES

    • Ignition ON.

    • Using a diagnostic scan tool, retrieve all Continuous Memory Diagnostic Trouble Codes (CMDTCs) from all modules.

    Are any charging system related Diagnostic Trouble Codes (DTCs) retrieved from the PCM? 

    Yes  DIAGNOSE the charging system concern. Refer to the appropriate Battery And Charging System article for the procedure.
    No  GO to  O2

  3. O2 CHECK BATTERY CONDITION

    • Ignition OFF.

    • Carry out the Battery Condition Test. REFER to: Battery .

    Did the battery pass the condition test? 

    Yes  If the battery passed the condition test but required a recharge, Refer to the appropriate Battery And Charging System article for the procedure. CLEAR all Diagnostic Trouble Codes (DTCs). TEST the system for normal operation. If the battery passed the condition test and did not require a recharge, GO to  O3
    No  INSTALL a new battery. REFER to: Battery .

  4. O3 CHECK CHARGING SYSTEM VOLTAGE

    NOTE: Do not allow the engine speed to increase above 2, 000 rpm while performing this step or the generator may self-excite and result in default charging system output voltage. If engine speed goes above 2, 000 rpm, shut the vehicle OFF and restart the engine before performing this step.

    • Start the engine.

    • Measure the voltage of the battery with and without a load on the charging system as follows:

      • Turn off all accessories and run the engine at 1, 500 rpm for a minimum of 2 minutes while measuring battery voltage.

      • Turn on headlights and HVAC fan on high and run engine at 1, 500 rpm for a minimum of 2 minutes while measuring battery voltage.

    Was the battery voltage between 13 and 15.2 volts? 

    Yes  GO to  O4
    No  DIAGNOSE the charging system concern. Refer to the appropriate Battery And Charging System article for the procedure.

  5. O4 CHECK VOLTAGE AT THE SCME (FRONT SEAT CLIMATE CONTROL MODULE)

    • Disconnect: Passenger Side Airbag In-line C3053.

    • Disconnect: SCME C3265A.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3265A-E
      GFD410781Courtesy of FORD MOTOR COMPANY
      		 Ground
      C3265A-F
      GFD410781Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the voltages greater than 11 volts? 

    Yes  GO to  O5
    No  REPAIR the circuit in question. GO to  O7

  6. O5 CHECK SCME (FRONT SEAT CLIMATE CONTROL MODULE) GROUND CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3265A-M
      GFD410782Courtesy of FORD MOTOR COMPANY
      		 Ground

    • Repeat this measurement while wiggling the harness.

    Is the resistance less than 3 ohms? 

    Yes  GO to  O6
    No  REPAIR the circuit. GO to  O7

  7. O6 CHECK THE SCME (FRONT SEAT CLIMATE CONTROL MODULE) OPERATION

    • Ignition OFF.

    • Disconnect and inspect all of the SCME connectors.

    • Repair:

      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins as necessary
      • pushed-out pins - install new pins as necessary

    • Reconnect the SCME connectors. Make sure they seat and latch correctly.

    • NOTE: Do not reconnect Passenger Side Airbag In-line C3053 at this time.

      Reconnect all previously disconnected connectors.

    • Ignition ON.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new SCME. REFER to: Front Seat Climate Control Module [SCME] . GO to  O7
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues. GO to  O7

  8. O7 VERIFY THE SRS (SUPPLEMENTAL RESTRAINT SYSTEM) PROVES OUT SUCCESSFULLY

    • Connect: Passenger Side Airbag In-line C3053.

    • Connect all previously disconnected connectors.

    Did the SRS prove out successfully? 

    Yes  Repair is complete. RETURN the vehicle to the customer.
    No  REFER to: Airbag Supplemental Restraint System (SRS) .
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