Interior Lighting With Time Delay

Interior Lighting Components:

Interior Lighting Diagrams:

Locations of components

3 Earthing point, facia
At the left-hand front speaker socket

8 Lighting relay
In the electrical distribution box behind the glove compartment (1987)

21 Ignition switch relay
In the electrical distribution box behind the glove compartment

22A Fuse board
Behind the access panel in the glove compartment

23 Flasher relay
In the electrical distribution box behind the glove compartment

50 Roof lamp, centre
In the centre of the roof

51 Roof lamp, front
In the roof console, at the inner rear-view mirror

53 Switch, interior lighting
In the roof console, at the inner rear-view mirror

54 Door switch for the interior lighting
One in each door frame

59 Two-pole connector
One under the roof console, at the inner rear-view mirror
One in each A-pillar (1988)

60 Single-pole connector
One in each A-pillar (1987)

82 Seat belt/ignition switch warning relay
In the electrical distribution box behind the glove compartment

113 Relay/time-delay relay for the rear window heater
In the electrical distribution box behind the glove compartment

122 Eight-pole connector
Under the facia, to the extreme left (behind the knee shield)

147 Ignition pulse amplifier
In the electrical distribution box behind the glove compartment

151 Time-delay relay for the interior lighting
In the electrical distribution box behind the glove compartment

155 Relay, AC/ACC
In the electrical distribution box behind the glove compartment

156 Time-delay relay, AC/ACC
In the electrical distribution box, behind the glove compartment

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

230 Distribution terminal +30
In the electrical distribution box behind the glove compartment

270 Shift-up indication relay
In the electrical distribution box behind the glove compartment

Operation
The interior lighting circuit of certain markets and model versions are equipped with relay 151. This relay provides a time delay.

The supply to the lighting is taken from fuse 16, while time-delay relay 151 is supplied via fuses 16 and 13.

When the interior lighting is switched on by a door being opened or a switch being operated, the relay will be energized, since its terminal Twill be earthed. When the circuit is then opened by the door being closed or the switch being opened, the interior lighting will stay alight. This is due to the fact that the delay circuit of the relay will keep the earth connection closed across contacts T and 31.

The time delay is about 15 seconds, but will be interrupted if the ignition switch is turned to the drive position. A positive voltage will then be applied to terminals 15 and 30, thus de-energizing the relay and opening the earth circuit across contacts T and 31.

Fault-tracing hints

1. Check fuse 16 and check that the supply to it is live.
2. Check lamps 50 and 51 and check that the supply to them is live.
3. Check that terminal 30 of relay 151 is live.
4. Set the ignition switch to the drive position. Check fuse 13 and check that the supply to it is live.
5. Check that the supplies to switch 53 and to terminal 15 of the relay are live.
6. Check the door switches, connectors, wiring and earth connections.