Warnings and indicators – circuit operation

WARNINGS AND INDICATORS – CIRCUIT OPERATION

CIRCUIT OPERATION

All warning Indicators are controlled by Data sent to the Instrument Cluster (Z142) from the Body Electrical Control Module (BeCM) (Z238). All data is transmitted via the serial data lines. The BeCM (Z238) will provide data based upon input from various sensors. Some warning lights may also be accompanied by a message which will appear in the message centre display on the instrument pack.

Service Reminder Indicator (SERVICE ENGINE)

Illuminates briefly (for 3 seconds) as a bulb check when the Ignition switch is turned to position II. Illuminates continuously when the vehicle reaches 50,000 miles (80,500 km) approx.

Low Fuel Warning Indicator

Illuminates briefly (for 4 seconds) as a bulb check when the Ignition Switch is turned to position II. When the fuel gauge sensors resistance value increases to 175 Ω (9 liters/2.25 US gallons, the low fuel warning light will illuminate to warn of the fuel status. Both Petrol and Diesel sensors are interfaced to the Instrument Cluster (Z142) via the BeCM (Z238).

High Temperature Warning Indicator

Illuminates briefly (for 4 seconds) as a bulb check when the Ignition switch is turned to position II. The engine coolant temperature gauge sensor has the capability to sense from -40
C to +130
C. Petrol and Diesel resistance valves are different. Both Petrol and Diesel sensors are interfaced to the Instrument Cluster (Z142) via the BeCM (Z238).

Malfunction Indicator Lamp (CHECK ENGINE)

Illuminates briefly when the Ignition Switch is turned to position II as a bulb check and extinguishes when the engine is running. Illumination at any other times indicates an engine fault. Both Petrol and Diesel Engine Control Modules (Z132) are interfaced to the Instrument Cluster (Z142) via the BeCM (Z238).

Oil Pressure Warning Indicator

Illuminates as a bulb check when the Ignition switch is turned to position II, and extinguishes when the engine is running. The Oil Pressure Switch (X149) is closed with Low Oil Pressure. Both Petrol and Diesel switches are interfaced to the Instrument Cluster (Z142) via the BeCM (Z238).

ABS Warning Indicator

This light illuminates for approximately 1 second when the Ignition switch is turned to position II, and then briefly extinguishes before coming on again. The warning indicator will then remain illuminated until the vehicle is driven above approximately 5 mph (7 km/h). If the light does not extinguish or illuminates again then a fault has occurred with the ABS system. If the light remains illuminated once a speed of 5 mph (7km/h) has been reached, or subsequently illuminates whilst driving, a fault has been detected by the self-monitoring system. The message centre will display
ABS FAULT  . The ABS System is interfaced to the Instrument Cluster (Z142) via the BeCM (Z238).