Instrument Panel, Gauges and Warning Indicators: Description and Operation

Instrument Cluster and Panel Illumination

COMPONENT LOCATION









INTRODUCTION
Instrument cluster and panel illumination is provided by light emitting diodes which are activated in conjunction with the exterior lights. The illumination intensity can be adjusted using a dimmer switch located in the auxiliary switch pack.

DIMMER SWITCH
The dimmer switch is a variable resistor installed in a circuit with the instrument cluster, which is used as a potential divider to provide a high or low voltage according to its set position.

CONTROL DIAGRAM

NOTE:
A = Hardwired; D = High speed CAN (controller area network) bus; N = Medium speed CAN (controller area network) bus.









PRINCIPLES OF OPERATION
When the exterior lights are on, the instrument cluster converts the voltage from the dimmer switch into an illumination level value, which it uses to set the illumination level of the instruments. The instrument cluster also transmits the illumination level value on the medium speed CAN (controller area network) bus to:
- The integrated control panel
- The CJB (central junction box)
- The driver and passenger door modules.
The integrated control panel sets the illumination level of its switches and the TSD (touch screen display) to the value contained in the CAN (controller area network) message.
The CJB (central junction box) transmits the illumination level value in a high speed CAN (controller area network) message to the JaguarDrive selector module, which sets the illumination level of its switches and controls accordingly. The CJB (central junction box) also controls power outputs to set the required illumination levels in:
- The overhead console
- The steering wheel audio, cruise control and paddle switches
- The accessory power socket/cigar lighter
- The auxiliary switch pack.
The driver and passenger door modules control power outputs to set the required illumination levels in their respective door switch packs.