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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 98 (Fire Suppression System) >> Diagnostic Tests >> Fire Suppression System >> Pinpoint Tests >> Pinpoint Test H: DTCs B299E and B29A8 - Suppressor Left/Right Circuit Resistance Low on Squib - Loop #1

Pinpoint Test H: DTCs B299E and B29A8 - Suppressor Left/Right Circuit Resistance Low on Squib - Loop #1

WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Police Option for schematic and connector information.

Normal Operation 

The fire suppression system module (FSSM) checks all of the fire suppressors circuits for faults. If the FSSM detects a low resistance condition between the LH fire suppressor squib 1 circuits, it stores DTC B299E in continuous memory and illuminates the fire suppression system indicator. If the FSSM detects a low resistance condition between the RH fire suppressor squib 1 circuits, it stores DTC B29A8 in continuous memory and illuminates the fire suppression system indicator.

DTC B299E (Suppressor Left Circuit Resistance Low on Squib - Loop #1) - sets when the FSSM detects a low resistance condition on the left fire suppressor squib 1 circuits 2312 (LG) and 2313 (BK/WH). This DTC will cause the fire suppression system indicator to illuminate.

DTC B29A8 (Suppressor Right Circuit Resistance Low on Squib - Loop #1) - sets when the FSSM detects a low resistance condition on the right fire suppressor squib 1 circuits 2310 (OG) and 2311 (DG). This DTC will cause the fire suppression system indicator to illuminate.

This pinpoint test is intended to diagnose the following:

PINPOINT TEST H: DTCs B299E AND B29A8 - SUPPRESSOR LEFT/RIGHT CIRCUIT RESISTANCE LOW ON SQUIB - LOOP #1 

WARNING: To reduce the risk of accidental deployment, never probe the connectors on the fire suppressors. Failure to follow this instruction may cause unintentional deployment of the suppressors, which may result in serious personal injury.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.
NOTE: The fire suppression system must be fully operational and free of faults before releasing the vehicle to the customer.
  1. H1 CHECK FOR ON-DEMAND DTCs OR CONTINUOUS MEMORY DTCs 
    • Carry out the FSSM self-test.
    • Were DTCs B299E or B29A8 retrieved as on-demand DTCs during the self-test? 
    1. YES  : Go to  H2.
    2. NO  : CHECK for causes of the intermittent fault. ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the key in the ignition lock cylinder frequently. REPEAT the self-test.
  2. H2 CHECK THE FSSM 
    • Key in OFF position.
      • WARNING: To reduce the risk of accidental deployment, do not use any memory saver devices when depowering the fire suppression system. Failure to follow this instruction may result in serious personal injury.
    • Disconnect the battery. Refer to BATTERY, MOUNTING & CABLES article.
    • Wait approximately 60 seconds to allow the fire suppression system backup power supply to deplete.
    • Disconnect: FSSM C3281a
      • Fig 1: Checking Fire Suppression Module
      GF0014696Courtesy of FORD MOTOR CO.
    • Measure the resistance between the FSSM C3281a pin 4, component side and the FSSM C3281a pin 5, component side; and between the FSSM C3281a pin 12, component side and the FSSM C3281a pin 13, component side.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : For DTC B299E, go to  H3.

      For DTC B29A8, go to  H4.

    2. NO  : INSTALL a new FSSM. REFER to Fire Suppression System Module (FSSM) . Go to  H6.
  3. H3 CHECK THE LH SUPPRESSOR SQUIB 1 CIRCUITS FOR LOW RESISTANCE 
    • Connect: FSSM C3281a
    • Disconnect: Inline C339
      • Fig 2: Checking Circuits For Short Together
      GF0014697Courtesy of FORD MOTOR CO.
    • Measure the resistance between the inline C339-3, circuit 2312 (LG), body harness side and the inline C339-4, circuit 2313 (BK/WH), body harness side.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  H5.
    2. NO  : REPAIR circuits 2312 (LG) and 2313 (BK/WH). CONNECT the inline C339. CONNECT the battery. Go to  H6.
  4. H4 CHECK THE RH SUPPRESSOR SQUIB 1 CIRCUITS FOR LOW RESISTANCE 
    • Connect: FSSM C3281a
    • Disconnect: Inline C339
      • Fig 3: Checking Circuits For Short Together
      GF0014698Courtesy of FORD MOTOR CO.
    • Measure the resistance between the inline C339-1, circuit 2310 (OG), body harness side and the inline C339-2, circuit 2311 (DG), body harness side.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  H5.
    2. NO  : REPAIR circuits 2310 (OG) and 2311 (DG). CONNECT the inline C339. CONNECT the battery. Go to  H6.
  5. H5 CHECK THE FIRE SUPPRESSORS 
    • Disconnect: Suspect Fire Suppressor
    • Connect the battery.
      • NOTE: DTCs B299A and B299F are expected to be retrieved when the self-test is performed with the LH Fire Suppressor C4317 disconnected. DTCs B29A4 and B29A9 are expected to be retrieved when the self-test is performed with the RH Fire Suppressor C4316 disconnected. These DTCs can be cleared once all the fire suppression connections are restored. If DTCs B299A, B299F, B29A4, or B29A9 are retrieved with all the fire suppression connections restored, refer to the FIRE SUPPRESSION SYSTEM MODULE (FSSM) DIAGNOSTIC TROUBLE CODE INDEX .
    • Carry out the FSSM self-test.
    • Were DTCs B299E or B29A8 retrieved as on-demand DTCs during the self-test? 
    1. YES  : INSTALL a new fire suppression system harness. Go to  H6.
    2. NO  : If DTC B29A8 was retrieved in Step H1, INSTALL a new RH fire suppressor. REFER to Fire Suppressor . Go to  H6.

      If DTC B299E was retrieved in Step H1, INSTALL a new LH fire suppressor. REFER to Fire Suppressor . Go to  H6.

  6. H6 CHECK FOR ADDITIONAL DTCs 
    • Refer to the continuous DTCs recorded during Step H1.
    • Were any additional continuous DTCs retrieved during Step H1? 
    1. YES  : REFER to the FIRE SUPPRESSION SYSTEM MODULE (FSSM) DIAGNOSTIC TROUBLE CODE INDEX .
    2. NO  : CLEAR the DTCs. REPEAT the self-test.
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