413-01 Instrument Cluster: Description And Operation (page 10 of 17)

 
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 an amber 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 TPMS has developed a fault. The tyre pressures should be monitored manually until the fault 
is rectified. 
 
14. Safety Belt Warning Indicator  
 
The safety belt warning indicator is controlled by the restraints control module and the instrument cluster software on 
receipt of CAN signals from the restraints control module. 
 
The indicator is illuminated in a red color when the ignition is moved to position II. The illumination will remain on until the 
safety belt buckle is latched in position. If the safety belt of an occupied front seat is not fastened, when the vehicle speed 
exceeds 8 km/h (5 mph) the indicator will flash and repetitive chime will emit for 10 seconds from the instrument cluster. 
This will be repeated every 30 seconds until the safety belt is fastened, the vehicle speed is reduced below 5 km/h (3 
mph) or the ignition switch is moved to the off position. 
 
On NAS vehicles, the indicator will remain permanently illuminated until the safety belt is fastened, the vehicle speed is 
reduced below 5 km/h (3 mph) or the ignition switch is moved to the off position. 
 
15 and 38. Brake Warning Indicator  
 
This indicator is controlled by CAN signals from the ABS module for Electronic Brake Assist (EBA) and Electronic Brake 
Distribution (EBD) faults. Brake pad wear or low brake fluid indications are controlled by the instrument cluster with the 
pad wear sensors and the fluid level sensor hard wired into the instrument cluster. 
 
The indicator can be illuminated in an amber or red colour depending on the fault. The indicator is illuminated for a bulb 
check when the ignition is switched on. The indicator is illuminated in an amber colour for 1.5 seconds and red colour for 
a further 1.5 seconds. If no faults exist, the indicator is extinguished after the bulb check period. 
 
The brake warning indicator functions are assigned priority. Fault conditions which require a red illumination have priority 
over amber illuminated faults. 
 
Brake Pad Wear 

The front left hand inboard brake pad and the rear right hand inboard brake pad are fitted with wear sensors. The 
pads are wired in series to the instrument cluster which continuously monitors the circuit. When one or both pads 
wear to their allowed limit (approximately 75% worn) the sensor circuit is broken and is detected by the instrument 
cluster software. The instrument cluster illuminates the brake warning indicator in a red colour and on high line 
instrument cluster a message 'CHECK BRAKE PADS' is displayed in the message center. When the pad(s) are 
replaced, the instrument cluster senses the completed circuit and withdraws the indicator illumination and 
message display (if applicable) when the ignition is switched on to position II.  

EBA/EBD Warning 

If a failure of the EBA or EBD functions occur, the ABS module transmits a CAN signal which is received by the 
instrument cluster. The instrument cluster software illuminates the brake warning indicator in an amber color for 
minor EBA/EBD faults and in a red color for major EBA/EBD faults. The indicator will remain illuminated for as 
long as the fault exists.  

Low Brake Fluid 

The brake fluid reservoir is fitted with a sensor which is connected directly to the instrument cluster. When the 
ignition is switched on to position II the fluid level is checked. To prevent incorrect warnings when the vehicle is 
moving, the sensor is monitored once every 25 seconds. If a low fluid situation occurs, the instrument cluster 
illuminates the brake warning indicator in a red color and on high line instrument clusters also displays the 
message 'CHECK BRAKE FLUID' in the message center. Illumination of the indicator for low fluid level is also 
accompanied by a chime from the instrument cluster.  

16. Anti-lock Brake System (ABS) Indicator  
 
The ABS indicator is controlled by the ABS module which transmits a CAN signal to the instrument cluster. The indicator 
is illuminated in an amber color for 3 seconds for a bulb check by the ABS module when the ignition is moved to position 
II. If the indicator remains illuminated or illuminates when driving, an ABS fault has occurred an the ABS function will not