14 · General

D4 Front/engine connection

Make: Alfa Romeo
Model: 156 Factory Service Manual
Year: 1997–2002
Section: Intermediate junctions › D4 Front/engine connection

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Connectors and pin-outsD4 Front/engine connection

D4 Front/engine connection

Connector D4A – front harness (black) – from 01/00

Pin	mm²	Colour		To
1	1.5	M	brown	D2A pin 1
2		MB	brown/white	E15B pin 6 D22 pin 2
3		VN	green/black	D1 pin A4
4		BV	white/green	M20 pin 6
5		CN	orange/black	E15B pin 15
6		AB	light blue/white	D2A pin 5
7	1.0	HN	grey/black	I30 pin 2 D5A pin H E15A pin 5 B1D pin 18
8	1.0	H	grey	I31 pin 1
9		NZ	black/violet	J15 pin 85
11	1.5	HV	grey/green	D1 pin B5
12		SG	pink/yellow	J15 pin 86
13	1.0	VB	green/white	D2A pin 6
14	1.0	RN	red/black	B98A pin 6
15		C	orange	J32 pin 86 J17 pin 85 8A_P5_X J31 pin 86 M20 pin 8 J20 pin 85 J30 pin 85
16		HR	grey/red	D1 pin B4
17		GR	yellow/red	J10 pin 86
18		L	blue	R10 pin 7
19		HG	grey/yellow	E10B pin 1
20	2.5	A	light blue	J17 pin 87

Connector D4A – front harness (black) – from 01/00

Pin	mm²	Colour		To
1	2.5	C	orange	B1C pin 2 J15 pin 87
2		MB	brown/white	E15B pin 6
3		VN	green/black	D1 pin A4
4		BV	white/green	M20 pin 6 R10 pin 7
5		CN	orange/black	E15B pin 15
6		AB	light blue/white	D2A pin 5
7	1.0	HN	grey/black	I30 pin 2 D5A pin H E15A pin 5 B1D pin 18
8	1.0	H	grey	I31 pin 3
9		H	grey	D2A pin 7
10		G	yellow	D2A pin 9
11		GR	yellow/red	J10 pin 85
12		GV	yellow/green	J15 pin 86
13	1.0	VB	green/white	D2A pin 6
14	1.0	R	red	B98A pin 10 M20 pin 3
15	1.5	M	brown	D2A pin 1
16	1.5	HR	grey/red	D1 pin 12
17		LR	blue/red	D2A pin 4 J32 pin 86
18		HR	grey/red	D1 pin B4
19		LN	blue/black	D2A pin 3
20	1.5	AR	light blue/red	L10 pin 1 B98A pin 6

Connector D4A – front harness (black) – 156 TS-16V <05/98, Automatic air conditioner

Pin	mm²	Colour		To
1	1.5	HR	grey/red	D1 pin 12
2		MB	brown/white	E15B pin 6
3		A	light blue	D1 pin 5
4		BV	white/green	M20 pin 6
5		CN	orange/black	E15B pin 15
6	1.0	MN	brown/black	J20 pin 86
7		G	yellow	D2A pin 3
8	1.0	ZN	violet/black	J16 pin 86
9		S	pink	B25 pin - J10 pin 85 M20 pin 8 J31 pin 86 J30 pin 85 J20 pin 85
10	1.5	HV	grey/green	D1 pin 13
11	1.0	VN	green/black	J10 pin 86
12	1.0	HG	grey/yellow	J15 pin 86
13		VB	green/white	D2A pin 19
14	1.0	R	red	B35 pin - M20 pin 3
15	1.5	M	brown	J20 pin 87
16		NZ	black/violet	D2A pin 2
17	1.0	VG	green/yellow	J31 pin 85
18		GN	yellow/black	R10 pin 7
19	1.0	V	green	J30 pin 86
20	1.5	B	white	J16 pin 87

Connector D4A – engine harness (black) – 156 TS-16V <05/98

Pin	mm²	Colour		To
1	1.5	HR	grey/red	K35 pin 2
2		MB	brown/white	M10 pin 6
3		A	light blue	M10 pin 9
4		BV	white/green	M10 pin 47
5		CN	orange/black	M10 pin 51
6	1.0	MN	brown/black	M10 pin 32
7		H	grey	M10 pin 43
8	1.0	ZN	violet/black	M10 pin 52
9		S	pink	M10 pin 27
10	1.5	HV	grey/green	K35 pin 1
11	1.5	VN	green/black	M10 pin 36
12	1.0	HG	grey/yellow	M10 pin 3
13	1.0	VB	green/white	M10 pin 40
14	1.0	R	red	M10 pin 18
15	1.5	M	brown	L20 pin @
16		G	yellow	M10 pin 44
17	1.0	VG	green/yellow	M10 pin 25
18		GN	yellow/black	M10 pin 55
19	1.0	V	green	M10 pin 26
20	1.5	B	white	N76 pin 1

Connector D4A – front harness (black) – up to 2/99

Pin	mm²	Colour		To
1	2.5	C	orange	B1C pin 2 J15 pin 87
2		MB	brown/white	E15B pin 6
3		VN	green/black	D1 pin 5
4		BV	white/green	M20 pin 6 R10 pin 7
5		CN	orange/black	E15B pin 15
6		AB	light blue/white	J20 pin 86
7	1.0	HN	grey/black	I30 pin 2 D5A pin H E15A pin 5 B1D pin 18
9		NZ	black/violet	D2A pin 2
10	1.5	HR	grey/red	D1 pin 12
11		GR	yellow/red	J10 pin 85
12		GV	yellow/green	J15 pin 86
13	1.0	VB	green/white	D2A pin 19
14	1.0	R	red	B35 pin - M20 pin 3
15	1.5	M	brown	J20 pin 87
16		G	yellow	D2A pin 3
17		LR	blue/red	J31 pin 86 J32 pin 86
18	1.0	H	grey	I31 pin 3
19		LN	blue/black	J30 pin 85
20	1.5	AR	light blue/red	L10 pin 1 B40 pin -

Connector D4A – engine harness (black) – up to 2/99

Pin	mm²	Colour		To
2		MB	brown/white	M10C pin 38
3		A	light blue	M10D pin 13
4	1.0	BV	white/green	M10C pin 39
5		CN	orange/black	M10F pin 21
6	1.0	S	pink	M10E pin 4
7	1.0	HN	grey/black	M10D pin 14
9		NZ	black/violet	M10E pin 15
10	1.5	HR	grey/red	K35 pin 2
11	1.5	GR	yellow/red	D4B pin G M10A pin 3 M10A pin 7 M10A pin 8 M10F pin 8 K46 pin 3
12	1.0	AR	light blue/red	M10C pin 29
13		VB	green/white	M10E pin 21
14	1.0	R	red	M10B pin 4
15	1.5	MN	brown/black	D80 pin 20
16		GN	yellow/black	M10E pin 17
17		RV	red/green	M10D pin 3
18		H	grey	D4A pin 19
19	1.0	BR	white/red	M10A pin 6
20	1.5	HV	grey/green	K41 pin 2 K40 pin 4

Connector D4A – engine harness (black) – from 2/99

Pin	mm²	Colour		To
2		MB	brown/white	M10C pin 38
3		A	light blue	M10D pin 13
4	1.0	BV	white/green	M10C pin 39
5		CN	orange/black	M10F pin 21
6	1.0	S	pink	M10E pin 4
7	1.0	HN	grey/black	M10D pin 14
8		H	grey	M10D pin 19
9		NZ	black/violet	M10E pin 15
10	1.5	HR	grey/red	K35 pin 2
11	1.5	GR	yellow/red	D4B pin G M10A pin 3 M10A pin 7 M10A pin 8 M10F pin 8 K46 pin 3
12	1.0	AR	light blue/red	M10C pin 29
13		VB	green/white	M10E pin 21
14	1.0	R	red	M10B pin 4
15	1.5	MN	brown/black	D80 pin 20
16		GN	yellow/black	M10E pin 17
17		RV	red/green	M10D pin 3
18		HR	grey/red	M10E pin 11
19	1.0	BR	white/red	M10A pin 6
20	1.5	HV	grey/green	K41 pin 2 K40 pin 4 K39 pin 4

Connector D4A – front harness (black) – up to 2/99

Pin	mm²	Colour		To
1	1.5	M	brown	J20 pin 87
2		MB	brown/white	E15B pin 6 D22 pin 2
3		VN	green/black	D1 pin 5
4		BV	white/green	M20 pin 6
5		CN	orange/black	E15B pin 15
6		AB	light blue/white	J20 pin 86
7	1.0	HN	grey/black	I30 pin 2 D5A pin H E15A pin 5 B1D pin 18
8	1.0	H	grey	I31 pin 1
9		RG	red/yellow	J15 pin 85
11	1.5	HV	grey/green	D1 pin 13
12		SG	pink/yellow	J15 pin 86
13	1.0	VB	green/white	D2A pin 19
14	1.0	RN	red/black	B41 pin @
15		C	orange	J32 pin 86 J17 pin 85 B25 pin - J31 pin 86 M20 pin 8 J20 pin 85 J30 pin 85
16		HR	grey/red	D1 pin 12
17		GR	yellow/red	J10 pin 86
18		L	blue	R10 pin 7
19		HG	grey/yellow	E10B pin 1
20	2.5	A	light blue	J17 pin 87

Connector D4A – engine harness (black) – up to 2/99

Pin	mm²	Colour		To
1	1.5	M	brown	L20 pin @
2		MB	brown/white	M10C pin 40
3		VN	green/black	M10C pin 26
4		BV	white/green	M10C pin 13
5	1.0	CN	orange/black	M10C pin 48
6	1.0	AB	light blue/white	M10D pin 32
7		HN	grey/black	M10B pin 8
8		H	grey	M10B pin 2
9	1.0	RG	red/yellow	M10C pin 30
11	1.5	HV	grey/green	K35 pin 2
12	1.0	SB	pink/white	M10C pin 52
13	1.0	VB	green/white	M10B pin 3
14	1.5	RN	red/black	M10A pin 1
15		C	orange	M10B pin 13
16	1.0	HR	grey/red	M10C pin 49
17		GN	yellow/black	M10C pin 46
18		L	blue	M10C pin 28
19		HG	grey/yellow	M10C pin 43
20	2.5	A	light blue	O20B pin @

Connector D4A – engine harness (black) – up to 2/99

Pin	mm²	Colour		To
1	1.5	M	brown	I60 pin 1
2		MB	brown/white	M10C pin 40
3		VN	green/black	M10C pin 26
4		BV	white/green	M10C pin 13
5	1.0	CN	orange/black	M10C pin 48
6	1.0	AB	light blue/white	M10D pin 32
7		HN	grey/black	M10B pin 8
8		H	grey	M10B pin 2
9	1.0	RG	red/yellow	M10C pin 30
11	1.5	HV	grey/green	K35 pin 2
12	1.0	SB	pink/white	M10C pin 52
13	1.0	VB	green/white	M10B pin 3
14	1.5	RN	red/black	M10A pin 1
15		C	orange	M10B pin 13
16	1.0	HR	grey/red	M10C pin 49
17		GN	yellow/black	M10C pin 46
18		L	blue	M10C pin 28
19		HG	grey/yellow	M10C pin 43
20	2.5	A	light blue	O20B pin 2

Connector D4A – engine harness (black) – from 2/99

Pin	mm²	Colour		To
1	1.5	M	brown	L20 pin @
2		MB	brown/white	M10C pin 40
3		VN	green/black	M10C pin 26
4		BV	white/green	M10C pin 13
5	1.0	CN	orange/black	M10C pin 48
6	1.0	AB	light blue/white	M10D pin 32
7		HN	grey/black	M10B pin 8
8		H	grey	M10B pin 2
9	1.0	RG	red/yellow	M10A pin 8 M10A pin 7 D4B pin E
11	1.5	HV	grey/green	K36 pin 1
12	1.0	SB	pink/white	M10C pin 52
13	1.0	VB	green/white	M10B pin 3
14	1.5	RN	red/black	M10A pin 1
15		C	orange	M10B pin 13
16	1.0	HR	grey/red	M10C pin 49
17		GN	yellow/black	M10C pin 46
18		L	blue	M10C pin 28
19		HG	grey/yellow	M10C pin 43
20	2.5	A	light blue	O20B pin @

Connector D4A – engine harness (black) – from 2/99

Pin	mm²	Colour		To
1	1.5	M	brown	I60 pin 1
2		MB	brown/white	M10C pin 40
3		VN	green/black	M10C pin 26
4		BV	white/green	M10C pin 13
5	1.0	CN	orange/black	M10C pin 48
6	1.0	AB	light blue/white	M10D pin 32
7		HN	grey/black	M10B pin 8
8		H	grey	M10B pin 2
9	1.0	RG	red/yellow	M10A pin 8 M10A pin 7 D4B pin E
11	1.5	HV	grey/green	K36 pin 1
12	1.0	SB	pink/white	M10C pin 52
13	1.0	VB	green/white	M10B pin 3
14	1.5	RN	red/black	M10A pin 1
15		C	orange	M10B pin 13
16	1.0	HR	grey/red	M10C pin 49
17		GN	yellow/black	M10C pin 46
18		L	blue	M10C pin 28
19		HG	grey/yellow	M10C pin 43
20	2.5	A	light blue	O20B pin 2

Connector D4B – engine harness (black) – from 01/00

Pin	mm²	Colour		To
D	1.0	C	orange	M10C pin 21
E	4.0	V	green	D80 pin 12 M10A pin 2 D80 pin 1 K47 pin 1
F	1.0	HV	grey/green	K36 pin 1
G	4.0	N	black	M10A pin 3 M10A pin 7 M10A pin 8 D4A pin 11 M10F pin 8 K46 pin 3

Connector D4B – front harness (black) – from 2/99

Pin	mm²	Colour		To
D	1.0	C	orange	L10 pin 2
E	4.0	V	green	J10 pin 87 B98A pin 5
F	1.0	HV	grey/green	D1 pin B5
G	4.0	N	black	C10A pin @

Connector D4B – front harness (black) – 156 TS-16V <05/98

Pin	mm²	Colour		To
D	1.0	H	grey	B41 pin @
E	4.0	R	red	J10 pin 87 J15 pin 85 B41 pin - B40 pin -
F	1.0	C	orange	L10 pin 2
G	1.5	RN	red/black	L10 pin 1 J16 pin 85 B40 pin - J16 pin 30
C	1.0	CN	orange/black	B36 pin @

Connector D4B – engine harness (black) – 156 TS-16V <05/98

Pin	mm²	Colour		To
D	1.0	HR	grey/red	M10 pin 37
E	4.0	R	red	A30D pin 1 A30C pin 1 A30A pin 1 N70A pin 2 N70B pin 2 N70C pin 2 N70D pin 2 A30B pin 1
F	1.0	C	orange	M10 pin 5
G	1.5	RN	red/black	K41 pin 3 N74 pin 2
C	1.0	CN	orange/black	K40 pin 4

Connector D4B – front harness (black) – up to 2/99

Pin	mm²	Colour		To
D	1.0	C	orange	L10 pin 2
E	4.0	V	green	J10 pin 87 B40 pin -
F	1.0	HV	grey/green	D1 pin 13
G	4.0	N	black	C10A pin @

Connector D4B – engine harness (black) – up to 2/99

Pin	mm²	Colour		To
D	1.0	C	orange	M10C pin 21
E	4.0	V	green	D80 pin 12 M10A pin 2 D80 pin 1 K47 pin 1
F	1.0	HV	grey/green	K35 pin 1
G	4.0	N	black	M10A pin 3 M10A pin 7 M10A pin 8 D4A pin 11 M10F pin 8 K46 pin 3

Connector D4B – engine harness (black)

Pin	mm²	Colour		To
D		B	white	M10C pin 20
E	4.0	R	red	M10A pin 7 D4A pin 9 M10A pin 8
F		NZ	black/violet	O20A pin 1
G	4.0	N	black	M10A pin 4 M10A pin 5 M10A pin 6 O20B pin 1 O20A pin 2 M15C pin 1 M15C pin 2
A	1.0	LR	blue/red	M10C pin 45
B	1.0	LN	blue/black	M10B pin 23
C		G	yellow	M10D pin 15

Connector D4B – engine harness (black)

Pin	mm²	Colour		To
D		B	white	M10C pin 20
E	4.0	R	red	M10A pin 7 M10A pin 8
F		NZ	black/violet	O20A pin 1
G	4.0	N	black	M10A pin 4 M10A pin 5 M10A pin 6 O20B pin 1 O20A pin 2 M15C pin 1
A	1.0	LR	blue/red	M10C pin 45
B	1.0	LN	blue/black	M10B pin 23
C		G	yellow	M10D pin 15

Connector D4 – engine harness (black) – Euro3

Pin	mm²	Colour		To
2	1.0	BM	white/brown	L62 pin 2
3	1.0	BZ	white/violet	L30 pin 5
4	1.0	R	red	K41 pin 2 M15C pin 3 L62 pin 1 L30 pin 1
5	1.5	M	brown	L20
6		N	black	M15C pin 1
8		HG	grey/yellow	A10B
10	2.5	A	light blue	A20B
12		RN	red/black	M10B pin 82
13		V	green	M10B pin 83
14		HR	grey/red	M10B pin 110
15		HV	grey/green	K36 pin A
16		Z	violet	M15C pin 2
17		NZ	black/violet	M10B pin 111
18		HN	grey/black	K30
19		H	grey	M15C pin 5

Connector D4 – front harness (black) – Euro3

Pin	mm²	Colour		To
2	1.0	BN	white/black	M10A pin 15
3	1.0	BZ	white/violet	M10A pin 16
4	1.0	R	red	B98A pin 4 J17 pin 85 D2A pin 12 K31 pin 1
5	1.5	M	brown	D2A pin 1
6		N	black	C10A
8		HG	grey/yellow	E15B pin 7
10	2.5	A	light blue	H1A pin 50
12		RN	red/black	K81 pin 1
13		V	green	K81 pin 2
14		HR	grey/red	D1 pin B4
15		HV	grey/green	D1 pin B5
16		Z	violet	M10A pin 22
17		NZ	black/violet	J17 pin 86
18		HN	grey/black	E15B pin 5
19		H	grey	M10A pin 62

Connector D4 – engine harness (black) – Euro3

Pin	mm²	Colour		To
1	1.5	V	green	A30A pin 2 A30B pin 2 A30C pin 2 A30D pin 2 N70A pin 1 N70B pin 1 N70C pin 1 N70D pin 1
2		HG	grey/yellow	K30
3		B	white	K36 pin A1
4		M	brown	C40 pin A
5	1.0	V	green	L20 pin .
8	1.0	H	grey	A10B
9	1.5	L	blue	K15 pin 4 K16 pin 4 K17 pin 4 L10 pin 1 L15 pin 2 N76 pin 1
10	1.5	RN	red/black	A20B

Connector D4 – engine harness (black) – Euro3

Pin	mm²	Colour		To
1	1.5	LR	blue/red	A30A pin 3 A30B pin 3 A30C pin 3 A30D pin 3 A30E pin 3 A30F pin 3 N70A pin 1 N70B pin 1 N70C pin 1 N70D pin 1 N70E pin 1 N70F pin 1
2		MB	brown/white	K30
3		H	grey	K36 pin A1
4		M	brown	C40
5	1.0	RV	red/green	L20 pin .
8	1.0	H	grey	A10B
9	1.5	L	blue	K15 pin 4 K16 pin 4 K17 pin 4 K18 pin 4 L10 pin 1
10	1.5	RN	red/black	A20B

Connector D4 – engine harness (black) – 1.6 from 5/98

Pin	mm²	Colour		To
1	2.5	V	green	A30A pin 2 A30B pin 2 A30C pin 2 A30D pin 2
2		HV	grey/green	K36 pin 1
3		HR	grey/red	M10B pin 25
4	1.0	M	brown	C40A pin @
5	1.0	V	green	L20 pin @
9	1.5	B	white	K40 pin 4 N76 pin 1 L10 pin 2
10	1.0	G	yellow	N70A pin 1 N70B pin 1 N70C pin 1 N70D pin 1

Connector D4 – engine harness (black) – <5/98

Pin	mm²	Colour		To
1	2.5	V	green	A30A pin 2 A30B pin 2 A30C pin 2 A30D pin 2
2		G	yellow	K35 pin 1
3		L	blue	K35 pin 2
4	1.0	M	brown	C40A pin @
5	1.0	V	green	L20 pin @
9	1.5	B	white	K40 pin 4 N76 pin 1 L10 pin 2 L15 pin 1
10	1.0	G	yellow	N70A pin 1 N70B pin 1 N70C pin 1 N70D pin 1

Connector D4 – front harness (black) – Selespeed

Pin	mm²	Colour		To
1	2.5	MB	brown/white	B1C pin 2 J15 pin 87
2	1.0	HV	grey/green	D1 pin 13
4	1.0	N	black	M20 pin 4
5	1.5	M	brown	J20 pin 87
9	1.5	B	white	K41 pin 2 B98A pin 4 M10A pin 32 M10A pin 16 M10A pin 48
10	1.5	R	red	B98A pin 6

Connector D4 – engine harness (black) – Selespeed

Pin	mm²	Colour		To
1		V	green	A30A A30B A30C A30D
2		HV	grey/green	K36 pin 1
4	1.0	N	black	C40A
5	1.5	V	green	L20
9		L	blue	L15 pin 2 N76 pin 1 L10 pin 1 K40 pin 4
10		G	yellow	N70A pin 1 N70B pin 1 N70C pin 1 N70D pin 1

Wiring diagrams

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Parts & tools for this job Staging For 1997 Alfa Romeo 156

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