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Pinpoint Test J: DTCs B29AF, B29B0, B29B1 and B29B2 - Fire Suppression Manual Switch Failure

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 the fire suppression manual switch circuits for faults. If the FSSM detects an open or a short to ground on circuit 2315 (BK/PK), it stores DTC B29AF in continuous memory and illuminates the fire suppression system indicator. If the FSSM detects a short to voltage on circuit 2315 (BK/PK), it stores DTC B29B0 in continuous memory and illuminates the fire suppression system indicator. If the FSSM detects an open or a short to voltage on circuit 2314 (LB/BK), it stores DTC B29B1 in continuous memory and illuminates the fire suppression system indicator. If the FSSM detects a short to ground on circuit 2314 (LB/BK), it stores DTC B29B2 in continuous memory and illuminates the fire suppression system indicator.

DTC B29AF (Fire Suppression Manual Activation Switch High Side Circuit Failure) - sets when the FSSM detects either an open or a short to ground on circuit 2315 (BK/PK). This DTC will cause the fire suppression system indicator to illuminate.

DTC B29B0 (Fire Suppression Manual Activation Switch High Side Circuit Short to Battery) - sets when the FSSM detects a short to voltage on circuit 2315 (BK/PK). This DTC will cause the fire suppression system indicator to illuminate.

DTC B29B1 (Fire Suppression Manual Activation Switch Low Side Circuit Failure) - sets when the FSSM detects either an open or a short to voltage on circuit 2314 (LB/BK). This DTC will cause the fire suppression system indicator to illuminate.

DTC B29B2 (Fire Suppression Manual Activation Switch Low Side Circuit Short to Ground) - sets when the FSSM detects a short to ground on circuit 2314 (LB/BK). This DTC will cause the fire suppression system indicator to illuminate.

This pinpoint test is intended to diagnose the following:

PINPOINT TEST J: DTCs B29AF, B29B0, B29B1 AND B29B2 - FIRE SUPPRESSION MANUAL SWITCH FAILURE 

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. J1 CHECK FOR ON-DEMAND DTCs OR CONTINUOUS MEMORY DTCs 
    • Carry out the FSSM self-test.
    • Were DTCs B29AF, B29B0, B29B1, or B29B2 retrieved as on-demand DTCs during the self-test? 
    1. YES  : Go to  J2.
    2. NO  : CHECK for causes of the intermittent fault. ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition lock cylinder frequently. REPEAT the self-test.
  2. J2 CHECK THE FIRE SUPPRESSION MANUAL SWITCH 
    • 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
    • Disconnect: Inline C919
    • While pressing and releasing the fire suppression manual switch, measure the resistance between the inline connector pins, fire suppression manual switch wiring harness side as follows:
      FIRE SUPPRESSION MANUAL SWITCH COMPONENT TEST

      Switch Position Measurement Expected Value
      Pressed Between C919-1 and C919-2 Less than 20 ohms
      Released Between C919-1 and C919-2 Between 1,710 and 1,890 ohms
      Pressed Between C919-3 and C919-4 Less than 20 ohms
      Released Between C919-3 and C919-4 Between 1,710 and 1,890 ohms
    • Are the resistance values correct? 
    1. YES  : For DTC B29AF, go to  J4.
    2. For DTC B29B0, go to  J6.
    3. For DTC B29B1, go to  J8.
    4. For DTC B29B2, go to  J12.
    5. NO  : Go to  J3.
  3. J3 CHECK THE FIRE SUPPRESSION MANUAL SWITCH WIRING HARNESS 
    • Disconnect: Fire Suppression Manual Switch C9034
    • While pressing then releasing the fire suppression manual switch, measure the resistance between the fire suppression manual switch C9034 pins, component side as follows:
      FIRE SUPPRESSION MANUAL SWITCH COMPONENT TEST

      Switch Position Measurement Expected Value
      Pressed Between C9034-1 and C9034-2 Less than 20 ohms
      Released Between C9034-1 and C9034-2 Between 1,710 and 1,890 ohms
      Pressed Between C9034-3 and C9034-4 Less than 20 ohms
      Released Between C9034-3 and C9034-4 Between 1,710 and 1,890 ohms
    • Are the resistance values correct? 
    1. YES  : REPAIR or INSTALL a new fire suppression manual switch wiring harness. Go to  J14.
    2. NO  : INSTALL a new fire suppression manual switch. REFER to Fire Suppression Manual Switch . Go to  J14.
  4. J4 CHECK CIRCUIT 2319 (RD/YE) FOR AN OPEN 
    • Connect the battery.
    • Key in ON position.
      • Fig 1: Check Circuit For Open
      GF0014699Courtesy of FORD MOTOR CO.
    • Measure the voltage between the inline C919-1, circuit 2319 (RD/YE), body harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  J5.
    2. NO  : VERIFY the central junction box (CJB) fuse 33 (10A) is OK. If OK, DISCONNECT the battery. REPAIR the circuit. CONNECT the inline C919. CONNECT the FSSM C3281a. Go to  J14.
  5. J5 CHECK CIRCUIT 2315 (BK/PK) FOR AN OPEN OR A SHORT TO GROUND 
    • Key in OFF position.
      • Fig 2: Check Circuit For Open Or Short To Ground
      GF0014700Courtesy of FORD MOTOR CO.
    • Measure the resistance between the FSSM C3281a-10, circuit 2315 (BK/PK), harness side and ground; and between the FSSM C3281a-10, circuit 2315 (BK/PK), harness side and the inline C919-2, circuit 2315 (BK/PK), body harness side.
    • Is the resistance greater than 10,000 ohms between the FSSM and ground, and less than 5 ohms between the FSSM and the inline C919? 
    1. YES  : INSTALL a new FSSM. REFER to Fire Suppression System Module (FSSM) . Go to  J14.
    2. NO  : DISCONNECT the battery. WAIT 60 seconds for the fire suppression system backup power supply to deplete. REPAIR the circuit. CONNECT the inline C919. CONNECT the FSSM C3281a. Go to  J14.
  6. J6 CHECK CIRCUIT 2315 (BK/PK) FOR A SHORT TO VOLTAGE 
    • Connect the battery.
    • Key in ON position.
      • Fig 3: Checking Circuit For Short To Voltage
      GF0014701Courtesy of FORD MOTOR CO.
    • Measure the voltage between the FSSM C3281a-10, circuit 2315 (BK/PK), harness side and ground.
    • Is any voltage present? 
    1. YES  : DISCONNECT the battery. WAIT 60 seconds for the fire suppression system backup power supply to deplete. REPAIR the circuit. CONNECT the inline C919. CONNECT the FSSM C3281a. Go to  J14.
    2. NO  : Go to  J7.
  7. J7 CHECK CIRCUIT 2315 (OG) IN THE FIRE SUPPRESSION MANUAL SWITCH WIRING HARNESS FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Connect: Inline C919
    • Key in ON position.
      • Fig 4: Checking Circuit For Short To Voltage
      GF0014701Courtesy of FORD MOTOR CO.
    • Measure the voltage between the FSSM C3281a-10, circuit 2315 (BK/PK), harness side and ground.
    • Is any voltage present? 
    1. YES  : DISCONNECT the battery. WAIT 60 seconds for the fire suppression system backup power supply to deplete. REPAIR or INSTALL a new fire suppression manual switch wiring harness. Go to  J14.
    2. NO  : INSTALL a new FSSM. REFER to Fire Suppression System Module (FSSM) . Go to  J14.
  8. J8 CHECK CIRCUIT 1203 (BK/LB) FOR AN OPEN 
      Fig 5: Check Circuit For Open
      GF0014702Courtesy of FORD MOTOR CO.
    • Measure the resistance between the inline C919-4, circuit 1203 (BK/LB), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  J9.
    2. NO  : REPAIR the circuit. CONNECT the inline C919. CONNECT the FSSM C3281a. Go to  J14.
  9. J9 CHECK CIRCUIT 2314 (LB/PK) FOR A SHORT TO VOLTAGE 
    • Connect the battery.
    • Key in ON position.
      • Fig 6: Checking Circuit For Short To Voltage
      GF0014703Courtesy of FORD MOTOR CO.
    • Measure the voltage between the FSSM C3281a-11, circuit 2314 (LB/BK), harness side and ground.
    • Is any voltage present? 
    1. YES  : DISCONNECT the battery. WAIT 60 seconds for the fire suppression system backup power supply to deplete. REPAIR the circuit. CONNECT the inline C919. CONNECT the FSSM C3281a. Go to  J14.
    2. NO  : Go to  J10.
  10. J10 CHECK CIRCUIT 2314 (LB/PK) FOR AN OPEN 
    • Key in OFF position.
      • Fig 7: Check Circuit For Open
      GF0014704Courtesy of FORD MOTOR CO.
    • Measure the resistance between the FSSM C3281a-11, circuit 2314 (LB/BK), harness side and the inline C919-3, circuit 2314 (LB/BK), body harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  J11.
    2. NO  : DISCONNECT the battery. WAIT 60 seconds for the fire suppression system backup power supply to deplete. REPAIR the circuit. CONNECT the inline C919. CONNECT the FSSM C3281a. Go to  J14.
  11. J11 CHECK CIRCUIT 2314 (YE) IN THE FIRE SUPPRESSION MANUAL SWITCH WIRING HARNESS FOR A SHORT TO VOLTAGE 
    • Connect: Inline C919
    • Key in ON position.
      • Fig 8: Checking Circuit For Short To Voltage
      GF0014703Courtesy of FORD MOTOR CO.
    • Measure the voltage between the FSSM C3281a-11, circuit 2314 (LB/BK), harness side and ground.
    • Is any voltage present? 
    1. YES  : DISCONNECT the battery. WAIT 60 seconds for the fire suppression system backup power supply to deplete. REPAIR or INSTALL a new fire suppression manual switch wiring harness. Go to  J14.
    2. NO  : DISCONNECT the battery. WAIT 60 seconds for the fire suppression system backup power supply to deplete. INSTALL a new FSSM. REFER to Fire Suppression System Module (FSSM) . Go to  J14.
  12. J12 CHECK CIRCUIT 2314 (LB/PK) FOR A SHORT TO GROUND 
      Fig 9: Checking Circuit For Short To Ground
      GF0014705Courtesy of FORD MOTOR CO.
    • Measure the resistance between the FSSM C3281a-11, circuit 2314 (LB/BK), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  J13.
    2. NO  : REPAIR the circuit. CONNECT the inline C919. CONNECT the FSSM C3281a. Go to  J14.
  13. J13 CHECK CIRCUIT 2314 (YE) IN THE FIRE SUPPRESSION MANUAL SWITCH WIRING HARNESS FOR A SHORT TO GROUND 
    • Connect: Inline C919
      • Fig 10: Checking Circuit For Short To Ground
      GF0014705Courtesy of FORD MOTOR CO.
    • Measure the resistance between the FSSM C3281a-11, circuit 2314 (LB/BK), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : INSTALL a new FSSM. REFER to Fire Suppression System Module (FSSM) . Go to  J14.
    2. NO  : REPAIR or INSTALL a new fire suppression manual switch wiring harness. Go to  J14.
  14. J14 CHECK FOR ADDITIONAL DTCs 
    • Connect the battery.
    • Refer to the continuous memory DTCs recorded during Step J1.
    • Were any continuous memory DTCs retrieved during Step J1? 
    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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