Instrument Cluster
The instrument cluster acts as a system monitor for the audible and visual warnings. It receives inputs from switches and sensors directly or through the multiplex link from another module and triggers the necessary warning chime or visual warning
Ignition Switch Lock Cylinder (North America Only)
A warning chime will sound continuously when the driver door is open and the key is in the ignition, on removal of the key the warning will cease. The switch is an integral part of the ignition lock cylinder and therefore can only be installed with the lock cylinder.
Luggage Compartment Switch
The luggage compartment switch activates the system to provide a visual warning when the ignition is in position 11 and the luggage compartment is open/ajar.
Courtesy Lamp Switches
The courtesy lamp switches activate the system to provide a visual warning when the ignition is in position 11 and any of the doors are open/ajar.
Headlamp Switch
A warning chime will sound continuously when the driver door is open/ajar and the vehicle lamps are on. This warning is provided whether the key is in or out of the ignition and will cease after five minutes, when the lamps are switched off or when the door is closed.
Safety Belt Switch
A warning chime will sound continuously for approximately six seconds when the driver turns the ignition to position 11 and the safety belt is not engaged. The warning chime will cease if the safety belt is engaged. The switch is a integral part of the driver seat belt buckle and therefore can only be installed with a safety belt buckle.
Fail-safe Cooling (3.0L Engine)
The fail-safe cooling utilizes three stages of visual warnings.
- 122°C to 126°C - High engine temperature is displayed in the message center, the temperature warning light is illuminated constantly.
- 127°C to 165°C - Engine power reduced is displayed in the message center, the temperature warning light is illuminated constantly and a three chime warning is activated.
- 166°C to 210°C - Pull of the road and turn off the ignition is displayed in the message center, the temperature warning light will flash and a five chime warning is activated.
Air Bag Redundant Chime
A warning chime will sound every one second when a fault in the air bag circuit is detected. The warning chime is a secondary warning to the visual warning.
The complexity of the electronics involved with the speedometer and instrument cluster, of which the message center is a part, and the multiplexed communication network which are connected to it preclude the use of workshop general electrical test equipment. Therefore, reference should be made to the PDU User Guide for detailed instructions on testing the message center.
The PDU systematically tests and analyses all functions and the various systems affected by it.
Where a fault is indicated, some basic diagnostic methods may be necessary to confirm that connections are good and that wiring is not damaged before installing a new component.