Operation

Instruments Operation

Handbrake and low brake fluid level warning lamp
The handbrake and low brake fluid level warning lamps are connected to the instrument pack from pin C0230-10 on a KO wire to Header C0293 LHD/ C0285 RHD. From header C0293 LHD/C0285 RHD a KO wire is connected to the handbrake switch, the handbrake switch is locally earthed.

A second connection from header C0293 LHD/C0285 RHD is connected to the brake fluid level switch on a KO wire. The brake fluid level switch is earthed on a B wire.

If either of the switches closes an earth circuit via the closed switch contacts is completed and the handbrake/low fluid level warning lamp will be illuminated. Power for the warning lamp is internally connected to a supply from pin C0230-19 Pin C0239-19 is supplied power from the ignition feed from fuse 27 in the passenger compartment fusebox.

Oil pressure warning lamp
The oil pressure warning lamp is connected to the instrument pack from pin C0230-6 on a WN wire to the oil pressure warning switch, the oil pressure warning switch is locally earthed.

If the oil pressure switch closes, an earth circuit via the closed switch contacts is completed and the oil pressure warning lamp will be illuminated Power for the warning lamp is internally connected to a power supply from pin C0230-19. Pin C0239-19 is supplied power from the ignition feed from fuse 27 in the passenger compartment fusebox.

Refer to Engine for detailed description and operation of the oil pressure warning lamp.

Ignition and no charge warninq lamp - V8
The ignition and no charge warning lamp in the instrument pack is connected from pin C0230-11 to the alternator on an NY wire.

Refer to Starting and Charging for a detailed description and operation of the ignition and no charge warning lamp.

SRS warning Lamp
The SRS warning lamp is connected from pin C0233-7 to pin C0256-13 on the SRS DCU on a YR wire.

Refer to Restraint Systems for a description and operation of the SRS warning lamp circuit.

Engine management warning lamp - V8
The engine management warning lamp is connected from pin C0233-13 on the instrument pack to pin C0237-20 on the ECM on an RS wire.

Refer to Powertrain Management for Description and Operation of the engine management warning lamp.

Off road warning lamp
The off road warning lamp is connected from pin C0230-9 on the instrument pack to the off road mode switch.

Refer to Antilock Brakes / Traction Control Systems for a description of the operation of the off road warning lamp.

SLS warning lamp
The SLS warning lamp is connected from pin C0233-2 on the instrument pack to the SLABS ECU pin C0655-8 on a WO wire.

Refer to Antilock Brakes / Traction Control Systems for a description of the operation of the warning lamp circuit.

ABS warning lamp
The ABS warning lamp is connected from pin C0233-3 on the instrument pack to the SLABS ECU pin C0504-18 on a WR wire.

Refer to Antilock Brakes / Traction Control Systems for a description of the operation of the warning lamp circuit.

Traction control warning lamp
The traction control warning lamp is connected from pin C0233-4 on the instrument pack to the SLABS ECU pin C0504-13 on a WU wire

Refer to Antilock Brakes / Traction Control Systems for a description of the operation of the warning lamp circuit.

Hill descent control 'active' warning lamp (green).
The HDO active warning lamp is connected from pin C0233-5 on the instrument pack to the SLABS ECU pin C0504-16 on a WY wire

Refer to Antilock Brakes / Traction Control Systems for a description of the operation of the warning lamp circuit.

Hill descent 'tail' warning lamp (amber)
The hill descent tail warning lamp is connected from pin C0233-10 on the instrument pack to the SLABS ECU pin C0504-17 on a WK wire.

Refer to Antilock Brakes / Traction Control Systems for a description of the operation of the warning lamp circuit.

Direction indicator warning lamps
The direction indicator left and right warning lamps are connected from the instrument pack pin C0233-16 via header C0293 LHD/ C0292 RHD to pin C0661-1 on the BCU. This connection is part of the serial data bus between the instrument pack and the BCU.

The BCU and the Intelligent Driver Module (IDM) control the operation of the direction indicators warning lamps.

Refer to Lighting and Horns for details of operation.

Trailer warning lamp
The trailer warning lamp is connected from the instrument pack pin C0233-16 via header C0293 LHD/ C0292 RHD to pin C0661-1 on the BCU on an SK wire. This connection is part of the serial data bus between the instrument pack and the
BCU.

The BCU and the Intelligent Driver Module (IDM) control the operation of the trailer warning lamp

Refer to Lighting and Horns for details of operation.

Seat belt warning lamp (it fitted)
The seat belt warning lamp is connected on an SK wire from the instrument pack pin C0233-16 via header C0293 LHD/ C0292 RHD to pin C0661-1 on the BCU. This connection is the serial data bus between the instrument pack and the BCU. The seat belt switch is connected to pin C0662-16 of the BCU on a RW wire The seat belt switch is earthed on a B wire to earth header C0708 LHD/C0552 RHD.

The BCU controls the operation of the seat belt on warning lamp and an audible warning. The warning operates for a maximum of 6 seconds, after this time the BCU logic stops the warning output to the serial data bus.

The seat belt warning lamp is connected to the ignition supply from fuse 13 in the engine compartment fusebox. When the seat belt is fastened the seat belt switch is closed, and an earth path is completed from pin C0662-16 of the BCU on a RW wire to the closed contacts of the seat belt switch, to earth header C0708 LHD/C0552 RHD on a B wire.

When the earth path is completed the BCU logic circuits cancel the seat belt light on and seat belt audible warning signals sent via the serial data bus

Transfer box in neutral warning lamp (if fitted)
The transfer box in neutral warning lamp is connected on an SK wire from the instrument pack pin C0233-16 via header C0293 LHD/ C0292 RHD to pin C0661-1 on the BCU. This connection is the serial data bus between the instrument pack and the BCU.

Refer to Transfer Case for detailed Description and Operation of the transfer box in neutral warning lamp.

Main beam warning lamp
The main beam warning lamp is connected from the instrument pack pin C0230-3 on a US wire to the IDM in the passenger compartment fusebox.

Refer to Lighting and Horns for details of operation.

Anti theft alarm LED
The anti theft alarm LED is connected from the instrument pack pin C0233-8 on a BS wire to pin C0661-20 on the BCU

Refer to Antitheft and Alarm Systems for Description and Operation of the anti-theft system.

Active Cornering Enhancement (ACE) warning lamp
The ACE warning lamp is connected from the instrument pack pin C0233-1 on a BO wire to pin C0647-36 on the ACE ECU.

Refer to Suspension Control ( Automatic - Electronic Level ) for Description and Operation of the ACE system.

Differential lock warning lamp
The differential lock warning lamp is connected from the instrument pack pin C0230-8 on a BU wire via header C0761 to the differential lock unit. A feed from fuse 25 is sent by a GY wire through a resistor unit on pin C0038-1 and to the differential lock unit on a WN wire from pin C0037-2

If an earth path is completed on pin C0230-8 the instrument pack logic circuit monitors this as an input and provides power from the ignition supply to illuminate the warning lamp.

The ABS system controls the operation of the centre differential lock, refer to Antilock Brakes / Traction Control Systems; Description and Operation for further details.

Transmission oil warning lamp
The transmission oil warning lamp is connected from the instrument pack pin C0230-7 on a BLG wire to header C0293. BLG wires from header C0293 are connected to the transmission oil temperature sensors The sensors are located in the gearbox oil cooler and the rear of the transfer gearbox

If an earth path is completed on pin C0230-7 the instrument pack logic circuit monitors this as an input and provides power from the ignition supply to illuminate the warning lamp.

Fuel warning lamp
The instrument pack internal logic circuits monitors the resistance value of the fuel gauge circuit. The warning lamp will be illuminated via an internal supply from the ignition circuit if the value stored in the instrument pack memory is reached.

Sport and manual warning lamps (automatic vehicles only)
The sport warning lamp is connected from pin C0230-4 of the instrument pack on a YR wire to pin C0193-25 on the Electronic Automatic Transmission (EAT) ECU. The manual warning lamp is connected from pin C0230-5 of the instrument pack on a YG wire to the pin C0193-51 of the EAT ECU.

Both lamps are illuminated by the input from the EAT ECU and are earthed via the instrument pack. The EAT ECU sends an input to the lamps to indicate the EAT operating mode.

Refer to Transmission and Drivetrain for details of operation.

Speedometer- vehicles with ATC
The instrument pack is connected from pin C0230-16 on a KG wire via splice joint A87 and header C0290 to pin 00504-3 on the SLABS ECU. The SLABS ECU sends a speed signal to the instrument pack via this connection.

Speedometer- vehicles without ATC
The instrument pack is connected from pin 00230-16 on a KG wire via header C0290 to pin C0504-3 on the SLABS ECU. The SLABS ECU sends a speed signal to the instrument pack via this connection.

Overspeed warning
The overspeed warning lamp is connected from the SLABS ECU as described for the speedometer. The instrument pack software monitors the road speed signal supplied to the instrument pack on pin C0230-16. The warning lamp is illuminated at speeds of 78 mph (125.5 km/h) or above and extinguished at 74 mph (118.5km/h).

Coolant temperature gauge
The coolant temperature gauge is connected from pin C0233-15 on a GU wire to the ECM pin C0636-44 V8/C0658-7 Td5.

Refer to Powertrain Management for details of operation.

Tachometer
The tachometer gets an engine speed signal via pin C0230-15 of the instrument pack. Pin C0235-15 is connected on a WS wire via header C0291 to pin C0637-17 V8/C0658-19 Td5 on the ECM.

Refer to Powertrain Management for details of operation.

Fuel gauge
The fuel gauge is connected from pin C230-14 of the instrument pack to the fuel tank unit on a GB wire. The fuel tank unit sends an earth input on a KB wire to pin C0230-13 on the instrument pack. The fuel tank unit sender is of the variable resistance type and the fuel gauge displays a value according to the input sent from the fuel tank unit sender.