Sedan
Interior Lighting Diagrams:
Interior Lighting Components:
Locations of components
22A Fuse holder
In the electrical distribution box, in the engine compartment, on the left-hand wheel housing
50 Roof lamp, centre
In the centre of the roof lining
51 Roof lamp, front
On the roof, behind the inner rear-view mirror
52 Ignition switch lighting
Between the front seats, at the ignition switch
53 Interior lighting switch
Between the front seats, at the gear lever
54 Door switches, interior lighting
In each door pillar
58 12-pole connector
On the angle bracket, under the fascia on the left-hand side (behind the knee shield)
59 2-pole connector
One in the luggage compartment, above the left-hand wheel housing, behind the trim
One behind the roof lining, at the rear-view mirror
60 Single-pole connector
Between the front seats, under the centre console
82 Seat belt/ignition switch warning relay
Under the back seat, on the left-hand side
98 10-pole connector
To the left of the steering column, behind the knee shield below the fascia
117 Earthing point
Between the ignition switch and the handbrake lever
151 Time-delay relay for the interior lighting
Under the back seat, on the left-hand side
152A 29-pole white connector
152B 29-pole red connector
In the engine compartment, in the electrical distribution box on the left-hand wheel housing. The connectors are accessible from the interior of the car.
175 Control unit for the central locking system
Under the fascia on the right-hand side, behind the knee shield
Operation
There are two versions of the interior lighting system - one with a time delay and one without. Cars with delayed extinguishing of the interior lighting are equipped with an extra relay 151 (see the special section below).
The lights are supplied across fuse 28 and 29-pole white connector 152A, regardless of the position of the ignition switch.
The interior lights can be switched on and off by means of interior lighting switch 53, at the ignition switch.
When switch 53 is in position 2 (forward position), centre roof lamp 50, front roof lamp 51 and ignition switch lamp 52 are always switched on.
In position I (rear position), the interior lighting will be switched on if one of the door switches (54) is closed, i.e. if a door is opened. In position 0 (centre position), the interior lights are always off.
On cars for the USA and Canadian markets, and 1989 models for Japan, door switch 54 for the left-hand front door is supplied via seat belt/ignition switch warning relay 82.
Time delay
Cars with the interior lighting delay are equipped with time-delay relay 151 which is supplied across fuse 12 when the ignition switch is in the drive position, and with a constant supply from distribution terminal +30, regardless of the position of the ignition switch.
When the interior lighting is switched on, by a door being opened or a switch being operated, terminal T will be earthed and relay 151 will be energized.
When the circuit is subsequently broken, by the door being closed or the switch being operated, the interior lighting will remain switched on, since the timing circuit of the relay will keep the earth circuit closed across terminals T and 31.
The time delay is around 15 seconds, but will be interrupted if the ignition switch is turned to the drive position. A positive voltage (from +54) will then be supplied to terminal 15 of the relay. Both terminals - 15 and 30 - will then receive a positive supply. The relay will thus be de-energized and the earth circuit across terminals T and 31 will be broken.
Fault-tracing hints
1. Check fuse 28 and check that the supply to it is live.
2. Check the bulbs for the interior lighting and check that the supply to them is live.
3. Check the switches and door switches.
4. Check the connectors, cable harnesses and earth connections.
Time delay
On cars with time delay, check also the following points:
1. Turn the ignition switch to the drive position. Check fuse 12 and check that the supply to it is live.
2. Check that terminals 15 and 30 of relay 151 are live.