Pinpoint Test L: The Fire Suppression System Indicator Is Never On (Police Vehicles Only)

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test L: The Fire Suppression System Indicator Is Never On (Police Vehicles Only)

Refer to Wiring Diagram Set 60, Instrument Cluster for schematic and connector information. Diagrams By Number

Normal Operation

If the Fire Suppression System Module (FSSM) detects a concern with any of the fire suppression system components, the fire suppression indicator illuminates and a DTC is logged.

The FSSM is hardwired to the IC through a single input circuit and is grounded through the FSSM ground circuit. If a fault occurs in the fire suppression system, a DTC is set and the FSSM removes the ground on the input circuit, allowing the voltage to go high to the Instrument Cluster (IC), illuminating the fire suppression system indicator.

- DTC B29B3 (Fire Suppression Indicator Lamp Circuit Failure) - a continuous and on-demand DTC that sets if the FSSM detects a short to ground on the fire suppression indicator circuit 2318 (LG/RD).

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- FSSM
- IC



PINPOINT TEST L: THE FIRE SUPPRESSION SYSTEM INDICATOR IS NEVER ON (POLICE VEHICLES ONLY)

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

-------------------------------------------------
L1 CARRY OUT THE IC INDICATOR LAMP ACTIVE COMMAND USING THE SCAN TOOL


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Select the IC fire suppression system indicator (SUSP_LAMP) active command on and off. Observe the charging system warning indicator.
- Does the fire suppression system warning indicator illuminate when selected on and turn off when selected off?

Yes
GO to L2.

No
GO to L5.

-------------------------------------------------
L2 RETRIEVE THE RECORDED DTCs FROM THE FSSM SELF-TEST


- Check for recorded FSSM DTCs from the self-test.
- Are any DTCs recorded?

Yes
If DTC B29B3 is recorded, GO to L3.

For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center and Warning Chimes

No
GO to L6.

-------------------------------------------------
L3 CHECK THE FSSM FOR A SHORT TO GROUND


- Ignition OFF.
- Disconnect: FSSM C3281a.
- Ignition ON.
- Monitor the fire suppression indicator with the FSSM disconnected.
- Does the fire suppression indicator turn on?

Yes
GO to L6.

No
GO to L4.

-------------------------------------------------
L4 CHECK THE INPUT CIRCUIT FOR A SHORT TO GROUND


- Ignition OFF.
- Disconnect: IC C2220.
- Measure the resistance between the IC C2220-10, circuit 2318 (LG/RD), harness side and ground.




- Is the resistance greater than 10,000 ohms?

Yes
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

No
GO to L5.

-------------------------------------------------
L5 CHECK FOR CORRECT IC OPERATION


- Disconnect the IC connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the IC 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 IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). 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.

-------------------------------------------------
L6 CHECK FOR CORRECT FSSM OPERATION


- Disconnect the battery. Refer to Charging System.
- Wait approximately 60 seconds to allow the FSSM back-up power to discharge.
- Disconnect the FSSM connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the FSSM 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 FSSM. 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. TEST the system for normal operation.

-------------------------------------------------