Oil Pressure Warning Lamp/Indicator
Oil Pressure Warning Lamp Diagrams:
Oil Pressure Warning Lamp Components:
Locations of components
3 Earthing point, facia
At the left-hand front speaker socket
7 Earthing point
On the left-hand wheel housing
8 Lighting relay
1987: in the electrical distribution box behind the glove compartment
1988: in the electrical distribution box in the engine compartment, behind the left-hand head lamp 11 Full beam filament
12 Dipped beam filament
In the left-hand and right-hand headlamps
14 Rear lights
20 Ignition switch
On the right-hand side of the steering column
22A Fuse board
Behind the access panel in the glove compartment
29 Brake light switch
At the brake pedal
30 Brake lamps
In the rear light clusters
44 Oil pressure transmitter
At the top of the oil filter housing, on the rear right-hand side of the engine
47 Circuit board for the indicating and warning lamps
In the combined instrument on the facia
47D Oil pressure warning lamp
In pictogram 213 of the combined instrument
67 Six-pole connector
In the engine compartment, at the windscreen wiper motor
82 Seat belt/ignition switch warning relay
In the electrical distribution box behind the glove compartment
109 High-level brake light
Inside the rear window
110 Tachometer
In the combined instrument on the facia
132 Sensor for the speed transmitter
In the combined instrument on the facia
158 Negative distribution terminal
In the electrical distribution box behind the glove compartment
159 Distribution terminal +15
In the electrical distribution box behind the glove compartment
208 Door lock indication
In the lock mechanism inside each door
213 Pictogram
In the combined instrument on the facia
215 Dip switch
On the left-hand side of the steering column
228A Filament monitor
In the electrical distribution box behind the glove compartment
228B Filament monitor
In the electrical distribution box in the engine compartment, behind the left-hand headlamp (1988)
Operation
Pants of the external lighting system of the car are supervised by two filament monitors, 228A and 2288, and pictogram 213. The filament monitors are produced in a number of versions, to suit the various markets.
The pictogram also includes four lamps which will light up if the corresponding doors are not properly closed. The latter function is discussed separately in the section entitled "Pictogram - Door indication".
Filament monitor
The common feature of all market variants is that the filament monitor contains two monitoring relays for the following lights:
Full beam filament 11
Dipped beam filament 12 Filament monitor 228B
Rear lights l4
Brake lamps 30 Filament monitor 228A
These relays actuate the lamps in pictogram 213. The lamp to the left indicates faults on the front lights of the car, whereas the lamp to the right indicates faults on the rear lights of the car. Warning lamp 47D for the oil pressure is discussed below.
The lamp in the centre (central warning) lights up the contour of the car in the pictogram and will always light up whenever a fault is indicated.
The coil of every relay has two windings through which the corresponding lighting circuit is supplied.
When ignition switch 20 is in the drive position, a positive voltage will be supplied across fuse 13 and terminal +15 (159) to terminal 9 of the pictogram.
If an open-circuit should occur in one of the two lighting circuits, e.g. for dipped beam filaments 12, the resulting unbalance will cause the relay to be energized. The relay contacts will then close and terminal C2 will be earthed. The circuit for the left-hand lamp and the central warning lamp of the pictogram will be earthed and the lamps will light up.
If an open-circuit should occur in the supply to both lamps in an external lighting circuit, no unbalance will occur and no fault indication will therefore be provided.
If fuse 29 or 30 for the parking lights should blow, unbalance will occur in the filament monitor relay for the rear lights and fault indication will then be provided on the pictogram. This is due to the fact that the filament monitor relay for the rear lights has a separate supply from fuse 29 or 30.
Oil pressure warning lamp
The oil pressure warning lamp is intended to warn the driver that the engine oil pressure is below the predetermined value.
When the ignition switch is in the drive position, a positive voltage will be supplied to oil pressure transmitter 44, across fuse 13 and terminal +15 in the electrical distribution box, and across warning lamp 47D located in pictogram 213. If the lubricating oil pressure should drop below 0.3-0.5 bar, the oil pressure transmitter will close the circuit and the lamp will light up.
At the same time as lamp 47D is earthed and lights up, the central warning lamp of the pictogram will be earthed, causing the pictogram to light up.
Cars for the European market (except SE, FI and GB)
Cars for the European market differ in that the filament monitor includes an additional circuit for supervising brake light switch 29. The supply for the circuit is taken from terminal +15.
The system is performing correctly if the pictogram warning lamp for the rear lights lights up when the ignition is switched on, and is then switched off when the brake pedal has been depressed.
Cars for the US and CA markets
Cars for these markets differ in that a special supervisory function is added for high-level brake light 109. If the car is braked (pin 54 live) and the bulb in the high-level brake light does not light up, terminal C1 will be earthed. The pictogram will then indicate a fault in the rear lights.
Testing of indicating and warning lamps
Certain bulbs in pictogram 213 can be checked by setting ignition switch 20 to a special test position. The test position is between the drive and start positions of the ignition switch.
When the ignition switch is set to the drive position, the lamps to be tested will receive a positive supply across fuse 13 and terminal +15. (Terminal 9 on the pictogram).
When the ignition switch is then turned to the test position, the positive supply will remain and the lamps will be earthed simultaneously, since terminals C and C1 in the ignition switch will be interconnected.
The following lamps in the pictogram will be connected during the test:
Central warning lamp
The lamps for the front lights
The lamps for the rear lights
Oil pressure warning lamp
Fault-tracing hints
The warning lamps in pictogram 213 can be activated by setting ignition switch 20 to the drive position.
1. Check fuse 13 and check that the supply to it is live.
2. Check that the supply to terminal 9 (1987)17 (1988) on the pictogram is live.
3. Check the relevant bulbs in the pictogram. Carry out this check with the ignition switch in the test position (terminals C and C1 interconnected).
4. Check that terminal 15 of the relay is energized in the drive position (only on cars for the EU market except SE, FI and GB).
5. Disconnect and earth the cable connected to the oil pressure transmitter. If the lamp lights up, the circuit is in good condition.
6. Check the wiring and earth connections. If the filament monitor has been replaced, check against the spare parts catalogue that the correct market variant of the filament monitor has been fitted.