413-01 Instrument Cluster: Description And Operation (page 13 of 17)

 
This indicator is non-functional. 
 
33. Tyre Pressure Warning Indicator  
 
The tyre pressure warning indicator is only available on low instrument cluster, high line instrument clusters display 
warning messages in the message center. The Tyre Pressure Monitoring System (TPMS) indicator is controlled by the 
instrument cluster software on receipt of CAN signals from the TPMS module. The indicator is illuminated in a red color 
for a 3 second bulb check by the TPMS module when the ignition is moved to position II. 
 
If the indicator remains illuminated after the engine is started or illuminates when driving, the vehicle should be stopped at 
the earliest opportunity and the tyre pressures checked. 
 
34. Low Coolant Indicator  
 
The low coolant indicator is controlled by the instrument cluster. The coolant level sensor is hardwired into the instrument 
cluster which monitors the sensor output. The indicator is illuminated in an amber color for 3 seconds when the ignition is 
moved to position II. When the coolant in the header tank falls to a predetermined level, the instrument cluster senses the 
signals from the low coolant sensor. The instrument cluster flashes the indicator for 5 seconds accompanied by an a 
chime and then illuminates the indicator. The indicator remains illuminated until the coolant level in the header tank is 
restored to its correct level. The instrument cluster monitors the level sensor signals every 15 seconds to prevent incorrect 
warnings due to fluid movement. 
 
35. Overspeed Warning Indicator  
 
The overspeed warning indicator is only available on low line instrument clusters; on high line instrument cluster the level 
information is displayed by appropriate messages in the message center. The overspeed warning indicator is controlled 
by the instrument cluster and the speed threshold is determined by the default setting. The instrument cluster receives 
vehicle speed information from the ABS module on the CAN. The instrument cluster software monitors the speed signal 
data and determines when the speed threshold has been exceeded. When an overspeed condition occurs, the indicator is 
illuminated permanently for as long as the overspeed condition occurs. 
 
39. Adaptive Cruise Control (ACC) Indicator (if fitted)  
 
The ACC indicator is controlled by the ACC module and the instrument cluster software. The indicator is illuminated when 
cruise control is active and another vehicle is detected by the radar system in front of the vehicle. The indicator is 
illuminated in an amber color to alert the driver that the ACC system is active and will automatically control the vehicle 
speed to maintain a set distance from the vehicle in front. 
 

ANALOGUE INSTRUMENTS 

The analogue instruments located in the instrument cluster are as follows: 
 

Speedometer  
Tachometer  
Fuel level gage  
Engine coolant temperature gage.  

The speedometer, tachometer, fuel gauge and engine temperature gauge are each driven by an electronic stepper motor. 
The characteristics of this type of motor produce damping of the pointer needle. All of the gages return to their respective 
zero positions when the ignition is switched off. 
 

Speedometer 

The speedometer is driven by square wave signals derived from the wheel speed sensors and the ABS module. The 
wheel speeds are measured by the wheel speed sensors reading the rotational speed of the wheels from toothed targets 
on the hubs. The wheel speeds are passed from the sensors to the ABS module in the form of pulsed signals. The ABS 
module converts these signals into a speed output on the high speed CAN to the instrument cluster. 
 
Three versions of the speedometer display are used. The three versions show the speed in kilometres per hour, the 
speed in miles per hour as the main display and kilometres per hour as a secondary display and Canadian variants show 
the kilometres per hour as the main display and miles per hours as the secondary display. 
 

Tachometer