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Pinpoint Test F: DTCs B299C and B29A6 - Suppressor Left/Right Circuit Short to Ground - 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 suppressor circuits for faults. If the FSSM detects a short to ground on the LH fire suppressor squib 1 circuits, it stores DTC B299C in continuous memory and illuminates the fire suppression system indicator. If the FSSM detects a short to ground on the RH fire suppressor squib 1 circuits, it stores DTC B29A6 in continuous memory and illuminates the fire suppression system indicator.

DTC B299C (Suppressor Left Circuit Short to Ground - Loop #1) - sets when the FSSM detects a short to ground 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 B29A6 (Suppressor Right Circuit Short to Ground - Loop #1) - sets when the FSSM detects a short to ground 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 F: DTCs B299C AND B29A6 - SUPPRESSOR LEFT/RIGHT CIRCUIT SHORT TO GROUND - 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. F1 CHECK FOR ON-DEMAND DTCs OR CONTINUOUS MEMORY DTCs 
    • Carry out the FSSM self-test.
    • Were DTCs B299C or B29A6 retrieved as on-demand DTCs during the self-test? 
    1. YES  : Go to  F2.
    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. F2 CHECK THE LH AND RH SQUIB 1 CIRCUITS FOR A SHORT TO GROUND 
    • 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: Inline C339
    • Disconnect: FSSM C3281a
    • Measure the resistance between the inline C339, body harness side and ground as follows:
      DTC Connector-Pin Circuit
      B299C C339-3 2312 (LG)
      B299C C339-4 2313 (BK/WH)
      B29A6 C339-1 2310 (OG)
      B29A6 C339-2 2311 (DG)
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  F3.
    2. NO  : REPAIR the circuit in question. CONNECT the FSSM C3281a and the inline C339. CONNECT the battery. Go to  F5.
  3. F3 CHECK THE FSSM 
    • Connect: FSSM C3281a
    • Connect the battery.
      • NOTE: DTCs B29A4 and B299A are expected to be retrieved when the self-test is performed with the inline C339 disconnected. These DTCs can be cleared once all the fire suppression connections are restored. If DTCs B29A4 or B299A 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 B299C or B29A6 retrieved as on-demand DTCs during the self-test? 
    1. YES  : INSTALL a new FSSM. REFER to Fire Suppression System Module (FSSM) . Go to  F5.
    2. NO  : DISCONNECT the battery. CONNECT the inline C339. CONNECT the battery. CLEAR DTCs B29A4 and B299A. Go to  F4.
  4. F4 CHECK THE FIRE SUPPRESSORS 
      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.
    • Wait approximately 60 seconds to allow the fire suppression system backup power supply to deplete.
    • 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 B29A9 and B29A4 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, B29A9, or B29A4 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 B299C or B29A6 retrieved as on-demand DTCs during the self-test? 
    1. YES  : INSTALL a new fire suppression system harness. Go to  F5.
    2. NO  : If DTC B29A6 was retrieved in Step F1, INSTALL a new RH fire suppressor. REFER to Fire Suppressor . Go to  F5.

      If DTC B299C was retrieved in Step F1, INSTALL a new LH fire suppressor. REFER to Fire Suppressor . Go to  F5.

  5. F5 CHECK FOR ADDITIONAL DTCs 
    • Refer to the continuous memory DTCs recorded during Step F1.
    • Were any continuous memory DTCs retrieved during Step F1? 
    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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