Pinpoint Test L: The Fire Suppression System Indicator Is Always On (Police Vehicles Only)

WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.

L1 RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND FSM SELF-TESTS
- Check for recorded FSM DTCs from the continuous and on-demand self-tests.
- Are any DTCs recorded?
Yes : If DTC B29B3 is recorded, GO to L2.

No : GO to L2.
L2 CHECK CIRCUIT 2318 (LG/RD) FOR A SHORT TO GROUND
- Disconnect: Instrument Cluster C2220.
- Measure the resistance between the instrument cluster C2220-10, circuit 2318 (LG/RD), harness side and ground.
  
  Fig 1: Measuring Resistance Between Instrument Cluster C2220-10, Circuit 2318 (LG/RD), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
Yes : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

No : GO to L3.
L3 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
- Disconnect the instrument cluster connector.
- Check for:
  - corrosion
  - pushed-out pins
- Connect the instrument cluster connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes : INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER . TEST the system for normal operation.

No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
L4 CHECK FOR CORRECT FSM OPERATION
- Disconnect the battery. Refer to CHARGING SYSTEM - GENERAL INFORMATION .
- Wait approximately 60 seconds to allow the FSM back-up power to discharge.
- Disconnect the FSM connector.
- Check for:
  - corrosion
  - pushed-out pins
- Connect the FSM connector and make sure it seats correctly.
- Connect the battery.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes : INSTALL a new FSM. REFER to FIRE SUPPRESSION SYSTEM . TEST the system for normal operation.

No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.