Part 2A

ELECTRO/MECHANICAL INSTRUMENT CLUSTER (EMIC)

SMART CLUSTER FEATURES
The Electro/Mechanical Instrument Cluster houses the Fuel, Voltmeter, Engine Coolant Temp, and Oil Pressure gauges, the Speedometer and the Tachometer. The cluster positions the analog gauges using PCI Bus messages received from the PCM. The cluster also contains 11 (eleven) warning indicators as well as indicators for the Right and Left turn signals and the High Beam headlamps. Some of the indicators are hardwired to the cluster and some indicators are controlled by messages received on the PCI Bus. The vehicle Chime function, Courtesy Lamp Output, the Battery Saver function, and the Rear Window Defogger timer are contained internally within the cluster. The cluster contains a vacuum fluorescent (VF) display for the Odometer/Trip function. The cluster VF will also display P-codes and vehicle status messages. The cluster has the ability to store DTCs, communicate on the PCI Bus, display engine information, and display certain inputs using the DRB III. The cluster is also able to perform a manual self-test.

Normal Operation
As the ignition switch is rotated to the on position, the cluster will illuminate the Low Fuel, Seat Belt, Check Gauges, Airbag, SKIM, and Upshift (if equipped with a manual transmission) indicators. As the ignition switch is rotated towards the start position, the cluster will illuminate the Brake and ABS (if equipped) indicators The vacuum fluorescent (VF) display will indicate the last selected mode, either Odometer or Trip. The Odometer will remain in the last mode selected, Odometer or Trip, after each ignition cycle.

Instrument Cluster Self Test
The Instrument Cluster is capable of performing a manual self test. The self test is actuated by depressing and holding the trip reset button while turning the ignition from the off to the on position. The self test will terminate if the tachometer is greater than 300 RPM, the ignition is turned off or the test is complete. The cluster will perform the self test in the following manner:

1. Chime once.
2. Scroll an "8" across the VF.
3. Illuminate the VF decimal point.
4. Display the cluster software level (example: SOF 8.9).
5. Display the last 6 (six) digits of the Vehicle Identification Number (VIN).
6. Display fault codes in the VF display if set or scroll "no FAULTS" if no faults are set.
- ACM - Air Bag Message = bus b8.
- Indicator Open/Short = Airbag
- Panel Sense - Open Circuit PanEL OPEn.
- PCM - MIL Message = bus b0.
- SKIM - SKIM Message = bus b1.
7. Illuminate all applicable indicators.
- Brake Warning
- Check Gauges
- Cruise
- High Beam
- Low Fuel Warning
- MIL (Malfunction Indicator Lamp)
- Part Time Seat Belt
- SKIM
- Upshift
8. Display Speedometer Calibration Points.
9. Display Fuel Gauge Calibration Points.
10. Display Temperature Gauge Calibration Points.
11. Display Tachometer Calibration Points.
12. Display Volt Gauge Calibration Points.
13. Display Oil Gauge Calibration Points.

DTC Capabilities
The Instrument Cluster is capable of storing diagnostic trouble codes (DTC) and will communicate with the DRB III to display codes. The cluster has the ability to set DTCs for internal cluster failure, lack of communication with other modules, Air Bag Lamp circuit failure, and Panel Dimmer circuit failure.

If the cluster failure is a gauge or meter concern, DTCs will be stored by the PCM. Because the Instrument Cluster receives gauge and meter information from the PCM over the PCI Bus, it is the PCM's function to monitor these inputs and to store DTCs. For this reason the PCM DTCs should be checked first for any condition regarding a gauge problem, except for the Oil Pressure gauge.

There are DTCs associated with all the gauges except for the Oil Pressure gauge. The cluster receives oil pressure information from the PCM over the PCI Bus, but the PCM does not create DTCs for any oil pressure concerns. When diagnosing a gauge concern, the input that is used for the gauge message (fuel level sender, for example) must be valid. Because of OBD II requirements, most of the information used for monitoring the OBD II system is the same information used by the PCM to generate the PCI Bus gauge messages. OBD TI requirements state that the fuel level sender must be checked for rationality. This includes determining if the fuel sending unit voltage is too high or too low or if the voltage hasn't changed over time. If the PCM has determined that the sender information isn't valid, it will set a DTC. The presence or absence of a fuel level sending code in the PCM is an important factor to determine whether a fuel gauge problem is in the sending unit or in the cluster.

This same situation is used in all cluster diagnostics related to gauge operation with the exception of the Oil Pressure gauge. OBD II requirements do not include oil pressure monitoring. Therefore, oil pressure diagnostics would dictate that a mechanical oil pressure gauge be attached to the engine for verification of oil pressure readings.

VEHICLE STATUS MESSAGES DISPLAYED IN THE VF DISPLAY
During normal operation, if a condition is present, the cluster will inform the driver by displaying one of the following messages in the VF display. These messages will alternate (1 second ON / 1 second OFF) with the odometer if the vehicle speed is 0 (zero). If multiple conditions exist, the cluster will cycle through all messages including the odometer/trip odometer. When the vehicle speed is greater than 0 (zero), only the odometer will be displayed. The VF will only display faults while the condition exists. Messages with more than 6 characters will be scrolled. The displaying of P-codes will take priority over any Vehicle Status Messages and odometer/trip odometer information in the VF display.

"NO FUSE" In VF Display
- The M1 fuse is not detected by the cluster.

"NO BUS" In VF Display
While a loss of communication condition exists for all the following conditions:
- Airbag
- MIL
- SKIM

REAR WINDOW DEFOGGER
The timing circuit for the Rear Window Defogger is contained internally within the cluster. When the ignition is on, the first actuation of the Rear Window Defogger switch initiates a 10 (ten) minutes time cycle. After 10 (ten) minutes of the same ignition cycle has elapsed, the cluster will turn the defogger off by opening the ground to the Rear Window Defogger Relay. If the defogger switch is actuated a second time during the same ignition cycle, the cluster will turn the defogger off after 5 (five) minutes. While the defogger is on, depressing the switch a second time will turn the defogger off. If the ignition is turned off while the defogger is operating, the defogger will remain off when the ignition is cycled.

CHIME
The chime function is a tone generator internally contained within the cluster. The chime will only be operational when the M1 fuse is present and the ignition is in the Run/Start position except for the following functions:

Park/Headlamps On Reminder
- The Park or Headlamps are on.
- The ignition is off.
- The driver door is open (ajar switch closed to ground).
- This chime will time-out after 3 (three) minutes.

Key-In Ignition
- The key is in the ignition.
- The ignition is off.
- The driver door is open (ajar switch closed to ground).
- This chime continues until the condition changes. The following chime functions are listed in order of priority. If the cluster senses multiple chime situations and the lower priority chime request condition no longer exists, the cluster will ignore the request.

Seat Belt
- The ignition is cycled to the Run/Start position.
- The drivers seat belt is retracted (seat belt switch closed).
- The cluster illuminates the Seat Belt indicator for 6 (six) seconds or stops immediately if the seat belt is buckled.
- The chime sounds for 6 (six) seconds or stops immediately if the seat belt is buckled.

Driver Door Ajar Warning
- The ignition is on.
- The driver door is open (ajar switch closed to ground).
- No engine RPM message to the cluster. The cluster will not sound the chime if the engine is running.
- The chime will sound until the condition changes or will time-out after 20 (twenty) minutes.

Passenger Door Ajar Warning
- The ignition is on.
- No engine RPM message to the cluster. The cluster will not sound the chime if the engine is running.
- 3 (three) sets of 2(two) quick chimes are sounded.

Low Oil Pressure
- When the Oil Pressure Gauge indicates approximately 4 (four) psi and engine RPM is greater than 300 (three hundred).
- The cluster will illuminate the Check Gauges indicator.
- The cluster receives low oil pressure data on the PCI Bus from the PCM.
- The chime will sound until the condition changes.

Engine Temperature
- When the Engine Coolant Temperature gauge indicates 127 °C (260 °F).
- The cluster will illuminate the Check Gauges indicator.
- The cluster receives engine coolant temperature data on the PCI Bus from the PCM.
- A single chime is sounded.

Low Fuel
- When the Fuel Gauge indicates low fuel, approximately between 1/8th remaining and "E".
- The cluster will illuminate the Low Fuel indicator.
- A single chime is sounded.

Battery Voltage
- When the cluster detects a charging system fault condition or system voltage high condition based on PCI Bus data received from the PCM.
- The cluster will illuminate the Check Gauges indicator.
- A single chime is sounded.

High Speed Warning (Gulf Coast Vehicles Only)
- When the Speedometer exceeds 120 Km/h.
- The chime will continue to sound until the vehicle speed drops below 120 Km/h.

Turn Signal On
- When the Left or Right turn signal is turned on continuously for 1.0 mile (U.S. vehicles).
- Turn signal on continuously for 4.0 kilometers (BUX vehicles).
- Turn signal on continuously for 1.6 kilometers (Canadian vehicles).
- Vehicle speed is greater than 15 mph (22 Km/h).
- The chime will sound until the turn signal input is deactivated. If the other turn signal input becomes active or the vehicle speed drops below 15 mph (22 Km/h), the distance traveled will be reset.

SKIM (If Equipped)
- When the SKIM indicator is illuminated.
- The cluster receives SKIM data on the PCI Bus from the SKIM module.
- A single chime is sounded.

Park Brake Reminder
- When the Park Brake input is switched to ground and vehicle speed is present at the cluster.
- The cluster will chime 10 (ten) times.

Air Bag
- When the Air Bag indicator is illuminated.
- The cluster receives Air Bag data on the PCI Bus from the ACM.
- A single chime is sounded.

HARDWIRED INDICATORS
The following indicators are hardwired to the Instrument Cluster and will only operate with the ignition in the Run/Start position.

Seat Belt
- Illuminates during bulb check for 6 (six) seconds unless the seat belt is buckled (seat belt switch closed).
- Illuminates when a ground input is provided to the cluster.
- Non-replaceable LED.

Part Time
- Does not illuminate during bulb check.
- Indicates which mode the transfer case is in.
- Non-replaceable LED.

Brake/Park Brake
- Illuminates during bulb check for 4 (four) seconds.
- Illuminates when a ground input is provided to the cluster from the Park Brake Switch or when the Brake Warning Indicator Switch is grounded.
- If the Park Brake input is grounded and vehicle speed is present, the cluster will flash the indicator.
- Non-replaceable LED.

High Beam
- Does not illuminate during bulb check.
- Illuminates when a battery input is provided to the cluster.
- If the Park or Headlamps inputs are switched to battery with the driver door open and the ignition off, the cluster will flash the indicator.
- Replaceable bulb.

Turn Signal - Left
- Does not illuminate during bulb check.
- Illuminates when a battery input is provided to the cluster.
- Replaceable bulb.

Turn Signal - Right
- Does not illuminate during bulb check.
- Illuminates when a battery input is provided to the cluster.
- Replaceable bulb.

Front/Rear Fog
- Does not illuminate during bulb check.
- Illuminates when a battery input is provided to the cluster.
- Non-replaceable LED.

ABS
- Does not illuminate during bulb check.
- Illuminates when a ground input is provided to the cluster.
- Non-replaceable LED.