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Home >> Jeep >> 1999 >> Grand Cherokee 4WD V8-4.7L VIN N >> Repair and Diagnosis >> Relays and Modules >> Relays and Modules - Powertrain Management >> Relays and Modules - Computers and Control Systems >> Body Control Module >> Description and Operation >> Chime System
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Chime System

CHIME SYSTEM
The chime system in the WJ utilizes four modules. The Body Control Module (BCM) the Electronic Vehicle Information Center (EVIC) and Mechanical Instrument Cluster (MIC) and the SKIM module. The 99 WJ also has the PCM included and has the ability to request a chime. The chime is located in the BCM module. Each module monitors circuits and systems then sends a request for a chime from the BCM. The BCM is constantly monitoring the PCI bus for a chime request message. If a MIC EVIC or SKIM monitored system requires a chime to sound the request for the chime will come from the MIC EVIC or SKIM but the BCM will actually sound the chime.

The chime will sound for the following conditions:
MIC Requested Chime Messages
- Airbag
- Check Gauges:
- Charging Voltage Low
- Coolant Temp High
- Low Oil Pressure
- Check engine
- Low Fuel
- ABS
- Low Battery Voltage

BCM Initiated Chime Messages
- Headlamp ON with ignition OFF and driver door open
- Key in ignition with ignition OFF and driver door open
- Seat Belt Warning

EVIC Chime Requested Messages
When the following messages are displayed the EVIC will send a chime request to the BCM. The BCM will respond with two groups of three chimes each.
- Turn signal ON for more than 1.0 mile
- Service reminder
- Coolant level low
- Check battery
- Washer fluid low

Critical Speed Chart:




- Door or liftgate ajar (when critical speed is reached)

Sentry Key Immobilizer System
The Sentry Key Immobilizer System (SKIS) also uses tactile beep support from the chime warning system. The Sentry Key Immobilizer Module (SKIM) is programmed to send chime request messages over the Programmable Communications Interface (PCI) data bus to the Body Control Module (BCM) to provide audible confirmation that:

- the SKIM has been successfully placed in the Customer Learn mode.
- A new Sentry key transponder has been successfully programmed by the SKIM.

See the owner's manual in the vehicle glove box for more information on the features use and operation of the SKIS. For additional information refer to Body and Frame, Locks, Keyless Entry.
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