Multi-Function Unit Wiring (86/04/98/NAS)

MULTI-FUNCTION UNIT WIRING

TECHNICAL SERVICE BULLETIN

SITUATION

WIRING AND CONNECTOR INFORMATION FOR MULTI-FUNCTION UNIT

Information relating to the wiring and pin locations for the multi-function unit in Discovery vehicles is difficult to determine. In an effort to assist technicians in the pursuit of problems which may be related to multi-function units, a series of tables have been developed to assist in determining the root of the difficulty.

RESOLUTION

TESTING OF UNIT

Refer to the ETM for the model year in question for detailed wiring diagrams associated with the MFU. There is a specific "self- diagnostic" function performed by the MFU. Back-probing the MFU connector using the information supplied in the attachments to this TIB may be a useful method to help determine the operation of the various MFU functions.

PARTS INFORMATION

Information Only

WARRANTY CLAIMS

Normal warranty policy and procedures apply.

RANGE ROVER CLASSIC MULTIFUNCTION UNIT

Pin #	Wire Color	Function	Status
1	PU	Interior lamp control	Ground when active
2	G	Heated rear window relay control	Battery + when active
3	BG	T-Box position switch input	Ground in transfer neutral via T-box warning relay
4	PU	Door open output to window lift ECU, alarm and EAS	Ground when active
5	PW	Passenger or tail door switch input	Ground when door open
6	RY	Rear fog lamp switch input	Ground when switch pressed
7	RW	Drivers seat belt switch input	Ground when unbuckled
8	WLG	Front wiper delay input	Ground via 0-6K Ohm resistor in delay control
9	LGG	Intermittent front wiper input	Battery + with wiper switch in int. position
10	BK	Headlamp wash relay control	Ground when active
11	---	---	---
12	WR	Seatbelt warning lamp control	Ground when light on
13	LGB	Front wash input	Battery + when front wash switch pressed
14	Y	Vehicle speed input	Not used on NAS vehicles
15	OU	Rear screen wipe switch input	Battery + when switch pressed
16	LGS	Rear screen wash switch input	Battery + when switch pressed
17	UB	Headlights on input (fog lamp enable)	Battery + when headlamps on
18	PG	Drivers door switch input	Ground when door open
19	BP	Heated front screen switch input	Ground when switch pressed
20	PB/PO	Tailgate switch input	Ground when tailgate open
21	WP	Key in switch input	Battery + with key inserted
22	NS	Front wipe relay control	Ground when active
23	NO	Rear wipe relay control	Ground when active
24	PY	Heated front screen relay control	Ground when active

Pin Designation (Ref. ETM)	Function	Status
A	Engine oil pressure switch input	Ground with no oil pressure
B	Hazard switch input	Not used
C	Flasher unit output	Not used
D	Radio "on" input	Not used
E	Fuse F13 Fascia fuse box	Battery + with key on
F	Fuse F1 Fascia fuse box	Not used
G	Fuse F14 Fascia fuse box	Not used
H	Fuse F8 Fascia fuse box	Battery + when side lamps on
I	Fuse F12 Fascia fuse box	Battery + continuous
J	Heated rear screen switch input	Ground when switch pressed
K	Right hand turn signal input	Not used
L	Left hand turn signal switch input	Not used
M	Fuse F2 Fascia fuse box	Not used
N	Ground	E201 via fascia fuse box

DISCOVERY MULTIFUNCTION UNIT

Pin #	Wire Color	Function	Status
1	PU	Interior lamp control	Ground when active
2	G	Heated rear window relay control	Battery + when active
3	BK	T-Box position switch input	Ground in transfer neutral
4	B	Rear fog lamp relay control	Ground when active
5	PW	Passenger or tail door switch input	Ground when door open
6	RY	Rear fog lamp switch input	Ground when switch pressed
7	RW	Drivers seat belt switch input	Ground when unbuckled
8	WLG	Front wiper delay input	Ground via 0-6K Ohm resistor in delay control
9	LGG	Intermittent front wiper input	Battery + with wiper switch in int. position
10	BK	Headlamp wash relay control	Ground when active
11	---	---	---
12	WR	Seatbelt warning lamp control	Ground when active
13	LGB	Front wash input	Battery + when front wash switch pressed
14	Y	Vehicle speed input	Not used on NAS vehicles
15	OU	Rear screen wipe switch input	Battery + when switch pressed
16	LGS	Rear screen wash switch input	Battery + when switch pressed
17	U	Headlights on input (fog lamp enable)	Battery + when headlamps on
18	PG	Drivers door switch input	Ground when door open
19	BP	Heated front screen switch input	Not used on NAS vehicles
20	UP	Front fog lamps switch input	Not used on NAS vehicles
21	WP	Key in switch input	Battery + with key inserted
22	NS	Front wipe delay relay control	Ground when active
23	NO	Rear wipe relay control	Ground when active
24	PY	Heated front screen relay control	Not used on NAS vehicles

Pin Designation (Ref. ETM)	Function	Function
A	Engine oil pressure switch input	Ground with no oil pressure
B	Hazard switch input	Not used
C	Flasher unit output	Not used
D	Radio 'on' input	Not used
E	Fuse F13 Fascia fuse box	Battery + with key on
F	Fuse F1 Fascia fuse box	Not used
G	Fuse F14 Fascia fuse box	Not used
H	Fuse F8 Fascia fuse box	Battery + when side lamps on
I	Fuse F12 Fascia fuse box	Battery + continuous
J	Heated rear screen switch input	Ground when switch pressed
K	Right hand turn signal input	Not used
L	Left hand turn signal switch input	Not used
M	Fuse F2 Fascia fuse box	Not used
N	Ground	E201 via fascia fuse box

DEFENDER MULTIFUNCTION UNIT

Pin #	Wire Color	Function	Status
1	PU	Interior lamp control	Ground when active
2	WK	Heated rear window relay control	Battery + when active
3	BK	T-Box position switch input	Ground in transfer neutral
4	---	---	---
5	PW	RH door switch input	Ground when door open
6	---	---	---
7	WB	Drivers seat belt switch input	Ground when unbuckled
8	B	Front wiper delay input	Ground via 0-6K Ohm resistor in delay control
9	LGG	Intermittent front wiper input	Battery + with wiper switch in int. position
10	---	---	---
11	---	---	---
12	---	---	---
13	LGB	Front wash input	Battery + when front wash switch pressed
14	---	---	---
15	RLG	Rear screen wipe switch input	Battery + when switch pressed
16	BLG	Rear screen wash switch input	Battery + when switch pressed
17	---	---	---
18	PG	Drivers door switch input	Ground when door open
19	---	---	---
20	---	---	---
21	BR	Key in switch input	Battery + with key inserted
22	NS	Front wipe delay relay control	Ground when active
23	NP	Rear wipe relay control	Ground when active
24	---	---	---

Pin #	Wire Color	Function	Status
1	P	Fuse 2 Engine Compartment Fuse Box	Battery + continuous
2	WG	Fuse 1 Passenger Compartment Fuse Box	Battery + with key on
3	WN	Engine oil pressure switch	Ground when no oil pressure
4	RW	Lights 'On' input	Battery + when side lights on
5	WR	Heated Rear Screen Switch input	Ground when switch pressed
6	B	Ground	Ground via C550