Instrument Cluster
Instrument Cluster
OPERATION
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fusible link 11E and fusible link 17E (C0632) on an R wire. Both are located in the Battery Junction Box (BJB). Fusible link 17E (C0570) is connected to fuse 39P of the Central Junction Box (CJB) (C0583) by an NR wire. Fuse 39P (C0582) provides a constant battery feed to the instrument cluster (C0230) on a P wire. The instrument cluster (C0230) is provided a ground path on a pair of B wires.
Fusible link 11E (C0570) is connected to the ignition switch (C0028) by an N wire. When the ignition switch is in the ignition position, current flows across the switch (C0028) to fuse 68P of the CJB (C0582) on a Y wire. Fuse 68P (C0582) provides an ignition feed to the instrument cluster (C0230) on a G wire.
When the ignition switch is turned to the crank position, current flows across the switch (C0028) to the CJB (C0582) on a WR wire.
CAN Bus
The instrument cluster acts as a CAN bus gateway, receiving and supplying digital messages on the medium and high speed CAN bus. The instrument cluster (C0230) is connected to the medium speed CAN bus on YW (high) and YU (low) wires. The instrument cluster (C0230) is connected to the high speed CAN bus on YN (high) and YB (low) wires.
Analogue Instruments
Engine Coolant Temperature Gauge
An engine coolant temperature (ECT) signal is supplied to the instrument cluster (C0230) via the high speed CAN bus on YN (high) and YB (low) wires. The signal is generated by the ECT sensor (C0169) and provided to the instrument cluster by the Engine Control Module (ECM) (C0411 on TdV6, C0635 on V6 and V8).
Fuel Level Gauge
The instrument cluster (C0230) provides a feed to the fuel tank unit (C0114) on an R wire. Two resistive sensors are located within the fuel tank, one at the front and one at the rear. By measuring and taking an average of the voltage returned on a KB wire and a GB wire, the instrument cluster is able to determine how much fuel is in the tank.
The instrument cluster also takes into consideration the inclination of the vehicle. This information is supplied via the high speed CAN bus on YN (high) and YB (low) wires.
Speedometer
A vehicle speed signal is supplied to the instrument cluster (C0230) via the high speed CAN bus on YN (high) and YB (low) wires. The signal is generated by the ABS wheel speed sensors and provided to the instrument cluster by the ABS module (C0506).
Tachometer
An engine speed signal is supplied to the instrument cluster (C0230) via the high speed CAN bus on YN (high) and YB (low) wires. The signal is generated by crankshaft position sensor (C0168) and provided to the instrument cluster by the ECM (C0411 on TdV6, C0635 on V6 and V8).
Exterior Lighting Indicators
Front Fog Lamps
When front fog lamps are selected, the lighting control switch (C0041) provides a feed to fuse 38P of the CJB (C0582) on a UR wire. Fuse 38P (C0583) is connected to the front fog indicator within the instrument cluster (C0230) by a UP wire. The indicator is provided a ground path via the instrument cluster (C0230) on a B wire.
Rear Fog Lamps
When rear fog lamps are selected, the lighting control switch (C0041) provides a feed to fuse 44P of the CJB (C0582) on an RO wire. Fuse 44P (C0585) is connected to the rear fog indicator within the instrument cluster (C0230) by an RY wire. The indicator is provided a ground path via the instrument cluster (C0230) on a B wire.
Headlamps
When high beam is selected via the LH steering column multi-function switch, the CJB (C0580) provides a status signal to the instrument cluster (C0230) via the medium speed CAN bus on YW (high) and YU (low) wires.
Turn Signal Indicators
When a left or right turn is selected via the LH steering column multi-function switch, the CJB (C0580) provides a status signal to the instrument cluster (C0230) via the medium speed CAN bus on YW (high) and YU (low) wires.
Trailer
If the trailer socket is being utilised, the trailer indicator will flash in sequence with the turn signal indicators. The CJB (C0580) provides a status signal to the instrument cluster (C0230) via the medium speed CAN bus on YW (high) and YU (low) wires.
Warning Indicators - Red
Red warning indicators are located in the instrument cluster and are controlled as follows:
Engine Management System
The Engine Management System (EMS) warning indicator is controlled directly by the ECM (C0411 on TdV6, C0635 on V6 and V8) via the high speed CAN bus on YN (high) and YB (low) wires.
Ignition No Charge
The instrument cluster (C0230) receives a generator output status signal from the ECM (C0411 on TdV6, C0635 on V6 and V8) via the high speed CAN bus on YN (high) and YB (low) wires. If generator output is below predetermined limits the instrument cluster illuminates the ignition/no charge warning indicator.
Low Oil Pressure
When oil pressure is below pre-determined limits, a ground path is created through the sensor body. When the instrument cluster registers this ground it illuminates the low oil pressure warning indicator.
Engine Coolant Temperature
The instrument cluster (C0230) monitors the Engine Coolant Temperature (ECT) signal from the ECM (C0411 on TdV6, C0635 on V6 and V8) via the high speed CAN bus on YN (high) and YB (low) wires. Should the IC receive a signal that indicates the engine coolant temperature is above a pre-defined limit, the instrument cluster illuminates the ECT warning indicator.
Engine Coolant Level
The instrument cluster (C0230) monitors engine coolant level by providing a feed to the engine coolant level sensor (C0147) on an R wire. When engine coolant level drops below the minimum level, the switch contacts close and a ground path is created on a B wire. If the instrument cluster registers this ground path for more than 15 seconds, it will illuminate the warning indicator.
Safety Belt
The instrument cluster (C0230) is connected to the belt minder module (C2995) by a G wire. If the ignition is on and the front safety belts are not connected to the buckles, the belt minder module provides a signal to instrument cluster to illuminate the safety belt warning indicator.
Supplemental Restraint System
The instrument cluster (C0230) receives an SRS status signal from the restraints control module (C0256) via the high speed CAN bus on YN (high) and YB (low) wires. The restraints control module will illuminate the warning indicator when carrying out a systems test when the ignition is first switched on and if any subsequent system faults are detected.
Air Suspension
Depending on the status of the air suspension system, the warning indicator will illuminate either amber or red.
The instrument cluster (C0230) receives an air suspension status signal from the air suspension control module (C0867) via the high speed CAN bus on YN (high) and YB (low) wires. The instrument cluster illuminates the warning indicator either red or amber according to the severity of the fault.
Parking Brake Status Fault
The parking brake status/fault warning indicator can be illuminated in one of two ways. A system status signal is provided to the instrument cluster (C0230) by the parking brake module (C2178) via the high speed CAN bus on YN (high) and YB (low) wires. A system fault signal can be supplied by the parking brake module via the high speed CAN bus or a hard wired connection. The parking brake module is connected to the instrument cluster by a G wire.
If the fault signal is supplied via the high speed CAN bus, the warning indicator will extinguish when the ignition is switched off. If the fault signal is supplied via the hard wired connection, the indicator will remain illuminated.
Braking System Pad Wear
The braking system/pad wear warning indicator can be illuminated red or amber, depending on system status. Operation of the warning indicator is controlled by the instrument cluster based on a number of inputs. Dynamic Stability Control (DSC) information is supplied to the instrument cluster (C0230) via the high speed CAN bus on YN (high) and YB (low) wires.
The instrument cluster (C0230) is also connected to the pad wear sensors and brake fluid level switch. The instrument cluster provides a feed to the pad wear sensors (C0050 & C0968) on an R wire. The sensors are wired in series and provided a ground path on a B wire. A feed is provided to the brake fluid level switch (C0026) on a BK wire. When brake fluid level drops below the minimum value the switch contacts close and a ground path is created on a B wire.
Anti-Theft Alarm
Illumination of the anti-theft alarm warning indicator (C0230) is controlled directly by the CJB (C0580) on a BS wire.
Transmission
Depending on the status of the transmission, the warning indicator will illuminate either amber or red. The instrument cluster (C0230) receives a transmission status signal from the Transmission Control Module (TCM) (C0193) via the high speed CAN bus on YN (high) and YB (low) wires.
Door Open
The instrument cluster (C0230) receives a door open signal from the CJB (C0580) via the medium speed CAN bus on YW (high) and YU (low) wires. The instrument cluster will illuminate the warning indicator if any of the doors are open and the ignition is switched on.
Indicators - Amber
Amber warning indicators are located in the instrument cluster and are controlled as follows:
Glow Plug
The glow plug warning indicator is fitted to TdV6 instrument clusters only. The instrument cluster (C0230) receives a glow plug status signal from the ECM (C0411) via the high speed CAN bus on YN (high) and YB (low) wires and illuminates the indicator accordingly.
MIL
The MIL indicator is fitted to petrol derivative instrument clusters only. The instrument cluster (C0230) receives a MIL status signal from the ECM (C0635) via the high speed CAN bus on YN (high) and YB (low) wires. Operation of the MIL indicator is controlled directly by the ECM, with no input from the instrument cluster.
Anti-lock Braking System
The instrument cluster (C0230) receives an Anti-lock Braking System (ABS) status signal from the ABS module (C0506) via the high speed CAN bus on YN (high) and YB (low) wires. The instrument cluster will illuminate the indicator if a fault occurs in the system.
Dynamic Stability Control
The instrument cluster (C0230) receives a Dynamic Stability Control (DSC) status signal from the ABS module (C0506) via the high speed CAN bus on YN (high) and YB (low) wires and illuminates the indicator accordingly.
Transfer Box Low Range
The instrument cluster (C0230) receives a low range signal from the transfer box control module (C1319) via the high speed CAN bus on YN (high) and YB (low) wires. The indicator illuminates when low range has been selected.
Transfer Box Overheat
The instrument cluster (C0230) receives a transfer box overheat signal from the transfer box control module (C1319) via the high speed CAN bus on YN (high) and YB (low) wires and illuminates the indicator accordingly.
Low Fuel
The instrument cluster performs a bulb check on the low fuel indicator when the ignition is switched on. Subsequent illumination of the low fuel indicator is controlled by software within the fuel gauge.
Speed Control
The instrument cluster (C0230) receives a speed control status signal from the speed control module (C2145) via the high speed CAN bus on YN (high) and YB (low) wires. The indicator will illuminate when speed control is operational.
Parking Brake Fault
The instrument cluster (C0230) receives a system error signal from the parking brake module (C2178) via the high speed CAN bus on YN (high) and YB (low) wires and illuminates the indicator accordingly.
Fuel Fired Booster Heater
The instrument cluster (C0230) receives a Fuel Fired Booster Heater (FFBH) status signal from the FFBH (C0925) via the medium speed CAN bus on YW (high) and YU (low) wires. The instrument cluster will also illuminate the indicator when the ignition is first switched on as part of the bulb check function.
Hill Descent Control Fault
The instrument cluster (C0230) receives a Hill Descent Control (HDC) fault signal from the ABS module (C0506) via the high speed CAN bus on YN (high) and YB (low) wires. If a fault occurs in the system, the instrument cluster will illuminate the indicator.
Over speed
The over speed indicator is fitted to Gulf specification vehicles only and illuminates if vehicle speed rises above 117 km/h (73 mph). The instrument cluster (C0230) receives a vehicle speed signal from the ABS module (C0506) via the high speed CAN bus on YN (high) and YB (low) wires.
Tire Pressure Monitoring System
The instrument cluster (C0230) receives a Tire Pressure Monitoring System (TPMS) signal from the TPMS ECU (C1537) via the medium speed CAN bus on YW (high) and YU (low) wires. The instrument cluster will illuminate the indicator if the TPMS ECU registers a low tire pressure, and when the ignition is first switched on as part of the bulb check function.
Low Washer Fluid
The instrument cluster (C0230) monitors the condition of the washer fluid level switch (C0620) via an R wire. If the washer fluid level drops below the minimum value, the switch contacts close and a ground path is created on a B wire. Sensing this, the instrument cluster will illuminate the low washer fluid indicator.
The instrument cluster will also illuminate the indicator for three seconds when the ignition is first switched on as part of the bulb check function.
Indicators - Green
Green warning indicators are located in the instrument cluster and are controlled as follows:
Hill Descent Control Status
The instrument cluster (C0230) receives an HDC status signal from the ABS module (C0506) via the high speed CAN bus on YN (high) and YB (low) wires and illuminates the indicator accordingly.
City Mode
The instrument cluster (C0230) is connected to the parking brake module (C2178) by a G wire. When city mode is selected, the parking brake module provides a signal to the instrument cluster to illuminate the indicator.