Ford Sierra Manual

Auxiliary warning system components - location, testing, removal and refitting
Body electrical system / Auxiliary warning system components - location, testing, removal and refitting


Location
1 The AWS control unit, and (when fitted) the bulb failure monitor, are located behind the glovebox on models up to 1987.

2 On models from 1987, the control and bulb failure modules are located behind the driver’s side footwell trim panel.

Testing
3 Thorough testing and fault finding should be left to a Ford dealer or other electrical specialist, having test equipment. Unskilled or uninformed testing may cause damage.

4 Investigation of malfunctions should begin by checking that all wiring is intact and securely connected. If checking wires or sensors for continuity, always disconnect the control unit and/or bulb failure monitor before so doing, otherwise damage may be caused.

5 Note that false oil level readings can result if the car is parked on a slope. False bulb failure warnings may occur if incorrect wattage bulbs are fitted.

Removal and refitting
6 Disconnect the battery negative lead.

Warning lamp bulbs
7 Remove the single screw from the top edge of the facia panel in which the warning lamps are housed, then withdraw the facia panel (see illustration).

23.7 Remove the screw from the warning lamp facia panel
23.7 Remove the screw from the warning lamp facia panel

8 Twist the relevant bulbholder through 90º to remove it from the rear of the facia panel. The bulb is integral with the bulbholder and must be renewed as a unit (see illustration).

23.8 Removing an auxiliary warning lamp bulb
23.8 Removing an auxiliary warning lamp bulb

9 Refitting is a reversal of removal.

Graphic display unit and bulbs 10 Remove the clock or trip computer.

11 Remove the display unit retaining screw and the retainer, then pull the unit forwards and disconnect the wiring plug using a thinbladed screwdriver (see illustrations).

23.11a Removing the graphic display unit retaining screw
23.11a Removing the graphic display unit retaining screw

23.11b Disconnecting the wiring plug from the graphic display unit
23.11b Disconnecting the wiring plug from the graphic display unit

12 To renew a bulb, remove the two securing screws and pull the circuit board from the back of the unit to reveal the bulbs. The bulbs are a push-fit.

13 Refitting is a reversal of removal.

Control unit and bulb failure monitor 14 Unclip the trim panel from the lower edge of the passenger side lower facia panel.

15 On models up to 1987, pull off the two clips to release the control unit/bulb failure monitor mounting bracket. Depress the retaining tab and disconnect the relevant wiring plug, then remove the two securing screws and withdraw the control unit/bulb failure monitor (see illustration).

23.15 Auxiliary warning system control unit location
23.15 Auxiliary warning system control unit location

16 On models from 1987, release the retaining tang and carefully slide the control unit/bulb failure monitor downwards. Depress the retaining tab and disconnect the relevant wiring plug, then withdraw the control unit/bulb failure monitor.

17 Refitting is a reversal of removal. Note that when both a control unit and bulb failure monitor are fitted, the control unit wiring plug is coloured brown, and the bulb failure monitor wiring plug is coloured green.

Ice warning sender
18 This sender is located beneath the front panel on the right-hand side of the vehicle.

19 Where necessary, for improved access remove the horn.

20 Depress the two retaining tangs, disconnect the wiring plug and withdraw the sender unit from the slot in the front panel.

21 Refitting is a reversal of removal.

Door/tailgate/boot lid ajar switches 22 Remove the relevant lock.

23 Pull the switch from its location in the lock body, disconnect the wiring plug (if not already done) and withdraw the switch (see illustration).

23.23 Door lock and door ajar switch
23.23 Door lock and door ajar switch

24 Refitting is a reversal of removal.

Low coolant level sensor 25 Refer to Chapter 3.

Low washer fluid level switch 26 Syphon out the contents of the reservoir, then prise the switch from its grommet using a thin-bladed screwdriver. Disconnect the wiring plug.

27 Refitting is a reversal of removal, using a new grommet if necessary. Use a little liquid detergent as a lubricant.

28 On completion, refill the reservoir.

Low fuel level switch
29 The switch is integral with the fuel level sender unit. Details of fuel level sender unit removal and refitting are given in Chapter 4.

Low oil level switch
30 The switch is integral with the oil level dipstick. To remove, simply withdraw the dipstick from its tube and disconnect the wiring plug.

31 Refitting is a reversal of removal.


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