Instrument Cluster Illumination
The instrument cluster has 2 front flood illumination lamps and 4 rear back-lighting lamps. The signal to control these instrument cluster illumination lamps is a pulse width modulated voltage driven by the body control module (BCM).
The BCM varies the duty cycle based on the position of instrument panel dimmer knob. The duty cycle varies from approximately 20 percent LO to 100 percent HI. The BCM also sends class 2 messages to the cluster, to control odometer backlighting brightness, based on the position of the instrument panel dimmer knob.
Instrument Panel I/P Cluster Telltales
| Telltale Gage or Lamp | Input To BCM | Input To Cluster | ||
|---|---|---|---|---|
| Direct Wire | Serial Data | Direct Wire | Serial Data | |
| ABS | EBTCM | - | - | BCM |
| Low Traction | EBTCM | - | - | BCM |
| Air Bag | - | - | - | SDM |
| Brake | X | - | - | BCM |
| Hot Coolant | - | ECM V6 PCM 4 CYL |
- | BCM |
| DRL | X | - | - | BCM |
| Charging System | - | ECM | - | BCM |
| High Beam Lamp | X | - | - | BCM |
| Left Turn Lamp | - | - | X | - |
| Low Brake Fluid | X | - | - | BCM |
| Low Coolant | X | - | - | BCM |
| Low Fuel | - | ECM V6 PCM 4 CYL |
- | BCM V6 PCM 4 CYL |
| Washer Fluid Low | X | - | - | BCM |
| Service Engine Soon | - | ECM | - | BCM V6 PCM 4 CYL |
| Change Oil Soon | - | ECM V6 PCM 4 CYL |
- | BCM |
| Oil Pressure | - | ECM | - | BCM V6 PCM 4 CYL |
| Reduced Power (V6 Only) | - | ECM | - | BCM |
| Right Turn Lamp | - | - | X | - |
| Seat Belt | - | - | - | SDM |
| Security | X | - | BCM | - |
| Service Wrench | - | ECM V6 PCM 4 CYL |
- | BCM |
| Decklid/Lift Gate Ajar | X | - | - | BCM |
| Upshift | - | - | - | PCM |
| Speedometer | - | ECM V6 PCM 4 CYL |
- | BCM |
| Odometer | - | ECM V6 PCM 4 CYL |
- | BCM |
| Tachometer | - | ECM V6 PCM 4 CYL |
- | BCM |
| Fuel Gage | - | ECM V6 PCM 4 CYL |
- | BCM |
| Coolant Gage | - | ECM V6 PCM 4 CYL |
- | BCM |
| Illumination Lamps | Direct wire from BCM | |||