Page 301
Wiring Diagrams, Fuses and Relays
371-53
Cruise Control
1989-1991
+15
+30
I
+54
+54
I
I
I
5C
12JK
liE
11M
GR 1.0
GN/VT 1.0
VT 2.5
VT 2.5
8
122A
,23C
GN/VT 0.75
22
~
1528
H29-2
H33-2
12:lG
GN/VT 0.75
US,CA
M89:JP
M90, (T)SE.FI.
Ell GR ME FE .IE
152C
93
98
33'
H10-1 ... OG 0.75 Hl-16 OC 0.75
2. +:~J",3",.--,OG",--",,0.-",75"----@2[Qj-....:!:~~~""-!.L-lQ=;5I---l
H[2 -
61.
sv 0.5
60CA
BR 1.0
3
60
G8
29
6l6C SV 0.75
Hl-2
60
H1-5
S16C
SV O.7S
'6C
sv 0.75
~
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>
VI
~
sv O.7~
'-v----------'
o
0
N
'"..,
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133
TIP OFF
616A
613A
BU 0.5
59
H2-6
2
613A
BU 0.5
607 GN 0.5
GN 0.75
601 CL 0.75
CL 0.75
RO 0.75
N
-30
6.6
60JB
RO 0.5
sv 0.75
131
59
H2-6
•
US,CA
5.
603B
RO 0.5
-30
3-D,
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177
..::dl
12
187
3
G8
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,----'¥"'-''''--C'''--'''''' 17
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L-"""¥""--''''-'--''-----!>19
603 RD 1.0
H33-3
f::J
[2~J
~-----30
30
30
9
G3
9
G3
r
615
Turbo
I
CRUISE
II
147U
L 13J
Page 302
Wiring Diagrams, Fuses and Relays
371-54
Cruise Control
1992 and later
+15
+30
I
5C
Gy 1.0
+54
I
I
123K
lIE
GN/\'IH 1.0
WI-! 2.5
22A
31
4
+54
I
8
"M
Wt! 2.5
InA
131
600
RD/WH 10
BN 1.0
~H33-3
H33-1
123G
600
81'1 1.0
GN/WH 0.5
76
1.32
(~
334
H10-1
334 DC 0.75
020
Hl-16 DC 0.75
334 DC 0.75
L..._.=;;r1614
BK 0.75
H1-2
AUT
~
o Hl-2
616C
603
8K /RD 0.75
RD 1.0
H4-6
,--",60""0",C...=S,,,N--,I-=.O'--_1> 2 (j-"BN,,--,,0,-,-.7:=..5
-,
,.-A-------.
AUT
MAN
603
I
~30
613A
8U 0.5
~133
HI-5
r<J' .\-I---!7-'--+--.--o-j
H2-62
616
RD 1.0
141
ON
613A
8U 0.5
SK 0.75
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0.75
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US.CA
"
10
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131
I
6038
RO 0.5
615
SK 1.0
51
147U
T16.T16'\
13J
177
12
187
481
2 YE/WH 1.5
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,--"-1-'==--'-"'--1)13
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604 DC 0.5
'--+-"-P==--"-''--1)20( 608 RO 0.75
J60
0\50 005
A
TIP
orr
Page 303
Wiring Diagrams, Fuses and Relays
371-55
Direction Indicators and Hazard Warning Lights
Operation
The direction indicator stalk (24) switch connects either the
left or right direction lights to the flasher relay (23). This creates a load at terminal 49a of the flasher relay (23). With the
load connected, the flasher relay (23) begins cycling on and
off. The direction indicator stalk (24) also supplies constant
voltage to the cornering light (118) in the front cluster when
signaling left or right. For information on changing bulbs see
351 Lighting.
27
28
47H
471
89
90
118
158
direction indicator lights at left clusters
direction indicator lights at right clusters
left direction indicator in instrument cluster
right direction indicator in instrument cluster
side direction indicator in left fender (1986 and later)
side direction indicator in rIght fender (1986 and later)
cornering lights in the front clusters
negative distribution in main fuse/relay panel
Connector Locations
1985-1990
NOTE
58 12-pin connector behind the instrument panel to left of steering column
1528 29-pin bulkhead connector at main fuse/relay panel
152C 29-pin bulkhead connector at main fuse/relay panel
• If the direction indicators on one side operate correctly, the
flasher relay (23) is OK and can be ruled out as a problem.
1991 and later
• The direction indicators will operate erratically if a bulb is
bumed out or the wrong type of bulb is installed.
Fault Tracing
1. Check for voltage to the direction indicator switch terminal1 and the flasher relay terminal 49 whenever the
key is in the run position.
2. Check for ground at the flasher relay (23), terminal 31.
Component Locations
22A
23
24
25
main fuse/relay panel
flasher relay under Instrument panel, left side
direction indicator switch on steering column
hazard waming switch in instrument panel
_
L23
___J
1985-1990
3
7
9
93
G1
G3
G6
G8
G12
L~_,4
27 (28)
Ground Locations
ground point behind instrument panel
ground point at radiator cross member
ground point in luggage compartment
ground point at left wheel housing
1991 and later
___J
Hatchback
~9,90
H12-1 12-pin behind instrument panel, left of steering column
H29-2 29-pin bulkhead connector behind main fuse/relay panel (1991-1991 1/2)
H29-3 29-pin bulkhead connector behind main fuse/relay panel (1991-1991 1/2)
H33-2 33-pin bulkhead connector behind main fuse/relay panel
(1991 112 and later)
H33-3 33-pin bulkhead connector behind main fuse/relay panel
(1991 1/2 and later)
25
ground point at radiator cross member
ground point in luggage compartment
ground distribution at main fuse/relay panel
ground point behind instrument panel
ground point at left wheel housing
27 (28)
Sedan
'----- --
27 (28)
118
47H,471
Page 304
371-56
Wiring Diagrams, Fuses and Relays
Direction Indicators and Hazard Warning Lights
1985-1990
+x
+.30
+54
30e
RD 2.5
5G
GR 0.75
11C
VT 2.5
148 SV 0.5
149A SV 0.5
149 SV 0.75
148A SV 0.5
7
7
93
~
71
GL/RD 1.0
25
~
f-
>
'rn.::J
,.....
,.....
l(')
17
59
BR/VT
0.75
70A RD 1.0 2
l(')
,.....
,.....
ci
ci
0
>
ci
f
rn
I:t:
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n::
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N
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0
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N
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r rr(JI H
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9
152C
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1
I
90
13..J
2
193
SV 075
0
158
0
co
>
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>
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ci
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N
l(')
7
0
82
SV 075
193A
sv 0.75
158
J
C'l
79 RD VT 1.0
189E SV 1.0
189D SV 1.0
9
3-0,5-0
l!!!~------------------------------------~
79
RD/VT 1.0
79 RD VT 0.75
189 SV 1.5
2-0,4-0
-------------------------------------!!!!foI
L!. ....
015H 020
A
Page 305
Wiring Diagrams, Fuses and Relays
371-57
Direction Indicators and Hazard Warning Lights
1991 and later
+x
+54
+30
30C
lie
RD 2.5
WH 2.5
5G
GY 0.75
148 BK 0.5
l"gA BK 0.5
14-8A BK O.
149 8K 0.75
G12
Gl
3C
H33 - 2
71
70
YE/RD 1.0
OG 1.0
nB
8U/WH 1.0
r"70Q,'A'-.JRO~1L!.0$2_-l.~~o-'----"r:--=--:---:-:-=----'
,---t-+IJ71
17
80B
59
BN!WH 0.75
RO/WH 1.0
J72I+-1-------,
711t 8N/WH 0.75
77
8U/"HH \.0
77A
79A RO
~~
I
0.5
76A WH 0.5
77A
I
1 BujV.'H 0.75
9
.,
13...J
0>
N
I
~ ~~
110
'"I
80
ROjWH 1.0
t")
I
z
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8U/WH 0,75
2
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eN 1.0
BOA
1 RD/WH 0.75
90
81
8K 0.75
2 82
BK 0.75
G6
G6
1,0
76 au
79 R WH 1.0
222 GY 0.75
77
au
H 1,0
H 1.0
_IlK 1.0
IBID II( 1.0
G3
3-0.5-0
o.7S
7.
1.0
rtt:"=====~JRO/'OH
79 RO
O.7:io
G3
01511 020
aDA
RDf'vV!"I 0.75
Page 306
371-58
Wiring Diagrams, Fuses and Relays
Foglamps
Operation
Foglamps come on only when the park or low beam headlights are on. Voltage to control the foglamp relay (107) is supplied bythefoglamp switch (88), and ground is supplied by the
high beam headlight filaments. When the high beams are
switched on, the foglamp relay (107) is de-energized because
there is voltage at both terminals 85 and 86.
85
88
107
174
foglamps under front bumper
switch for foglamps in instrument panel
relay for foglamps in main fuse/relay panel
relay for daytime driving lights
Connector Locations
1985-1990
1528 29-pin bulkhead connector at main fuse/relay panel
152C 29-pin bulkhead connector at main fuse/relay panel
Fault Tracing
1. Check fuse 21. Check that the highbeam headlights
are not blown.
2. Turn the headlight switch (10) to the park position and
turn the fog lamp switch (88) on. Check for ground at
terminal 85 of the fog lamp relay (107), and check for
voltage at terminal 86.
1991 and later
H29-2 29-pin bulkhead connector behind main fuse/relay panel (1991-1991 1/2)
H29-3 29-pin bulkhead connector behind main fuse/relay panel (1991-1991 1/2)
H33-2 33-pin bulkhead connector behind main fuse/relay panel
(1991 1/2 and later)
H33-3 33-pin bulkhead connector behind main fuse/relay panel
(19911/2 and later)
Ground Locations
Component Locations
1985-1990
10 lighting switch in instrument panel
22A main fuse/relay panel at left wheel housing
3 ground point behind instrument panel
7 ground point at radiator cross member
1991 and later
G1 ground point at radiator cross member
G8 ground point behind instrument panel
174
10
85
88
Page 307
371-59
Wiring Diagrams, Fuses and Relays
Foglamps
85
11
85
4-72 BK 1,0
25
BU/WH 1.5
28
BK 1.5
11
470 8K 1.0
473
RD 1.0
471
RO 1.0
29
26
BK 1.5
WH 1.5
7
G1
7
G1
7
G1
+30
I
I
+x (MB5-MBB)
+ 15(MB9 and later)
+30
475
I
I
GY I.S
I
I
~~ 0 J~~/WH 1.5
S
I
931
158
o
r
31
2
30
1
X 1
~ ---"I~"f·iN h--" ~O ~
__
~
474
17
GY 1.5
59
BN!WH
BN/WH 0.75
075
59
478
o 7S
eN 0.75
1:~17
881
!C?J
0.75
r:-J 152C
~~77~~~:~
1
J60
WH 0,75
.---+__",4.,
30
86
107
(22B'D)
19A BU 1 0
476
BU/WH 0.75
.
DISH 142
27
BU/WH O.7~
~~~~2 ~H33-2
6
1
27
BU/WH 0 S
r 61
I
147G
L~I~~~75
J60
17
8K 60
177 3
G8
I ~@) I
1 B7556 1
Page 308
371-60
Wiring Diagrams, Fuses and Relays
Fuel System
Operation
1. Check the fuses. Check the ground wires at the cylinder head lifting lug.
All the cars covered by this manual have a variant of the
Bosch LH fuel injection system. Table a shows the applications for the LH system. This is a pulsed, electronic system.
2. Using an LED test light, check for a pulsed signal between pin 1 of the LH control unit (200) and ground
while cranking the engine. This is the tach signal from
the ignition system.
This section covers only the electrical fault tracing, component location, and wiring. Information on troubleshooting the
fuel injection system can be found in 240 Fuel Injection.
Table a. LH Fuel Injection Variants
System
YearlModel
Identification
LH 2.2
1985-1988
Turbo
1986-1987
Non-Turbo
Three-wire AIC idle valve, metal
air mass meter with a sealed
mixture adjustment screw, and a
throttle dashpot
1989 and
later Turbo
1988-1990
Non-Turbo
Two-wire AIC idle valve, plastic air
mass meter without a mixture
adjustment screw
LH 2.4
I
i
I
LH 2.4.2
1991and
later NonTurbo
Three-wire AIC idle valve, similar
plastic air mass meter without a
mixture adjustment screw, and a
throttle potentiometer
Fault Tracing
CAUTION
• Before making electrical tests on the fuel system, please
read and understand the wamings given at the beginning of
300 Electrical-General.
• Always wait at least 40 seconds before disconnecting the
main connector at the LH controi unit (200). The main fuel injection relay has a timing feature that maintains power for
about 30 seconds. Damage to the control unit will result if the
connector is removed too soon.
• On models with LH 2.4 and LH 2.4.2, activate and read any
stored fault codes before disconnecting the LH control unit
(200) connector. The LH diagnostic memory will be erased if
the battery is disconnected or if the control unit connector is
removed. See 240 Fuel Injection for information on LH fault
diagnosis.
• Use only a digital multimeter (DMM) or LED test light when
making electrical checks/tests on the LH fuel system circuit.
• Where possible, probe the rear of connectors when making
electrical checks. Otherwise the small contacts in the connectors may be damaged causing faulty or intermittent operation.
3. Using an LED test light, check for a pulsed signal at the
fuel injector connectors while cranking the engine. Positive (+) battery voltage is always present at the connectors and the LH control unit switches the ground
side of the circuit to turn the injectors on and off.
Component Locations
22
47
47P
75
76
94
101
102
103
132
136
144
146
147
156
159
166
176
200
202
203
204
205
206
229
271
272
285
321
323
347
389
390
main fuse/relay panel in engine compartment
combined instruments
CHECK ENGINE light
voltage distribution block in engine compartment right bulkhead
switch for raising idle speed (automatic transmission) at center console
at shift lever
starting injector in throttle housing
supply fuel pump in the fuel tank
fuel pump relay at the LH control unit 200, forward of r.f. door
main fuel pump in the fuel tank
speed transmitter at the rear of the instrument cluster
lambda (oxygen) exhaust sensor in the exhaust manifold
boost pressure switch (turbo)
ignition amplifier/control unit in engine compartment, left bulkhead
ignition pulse amplifier at main fuse/relay panel, position 0
AlC compressor relay at main fuse/relay panel, engine compartment
+15 distribution terminal in main fuse/relay panel, engine compartment
AlC pressure switch for cooling fan at receiver/dryer unit, engine compartment
EZK control unit in engine compartment, left bulkhead
LH control unit forward of the right front door, behind trim
engine temperature transmitter at intake manifold flange, between cylinders 2 and 3
throttle angle transmitter on throttle housing
LH diagnostic connector, in engeine compartment, behind right-hand
wheel housing
LH air mass meter in the throttle intake hose
fuel injectors at intake manifold
fuel injection main relay at the LH control unit 200, forward of r.f. door
lambda preheater (integral with lambda sensor)
AIC valve (idle speed motor) at front left side of cylinder head
fuse for lambda sensor in engine compartment. next to fresh air intake
charcoal canister valve (ELCD) in engine compartment, ahead of left
wheel housing
fuel pump in fuel tank
LH diagnostic connector, under rear seat, right side
NTC resistor under intake manifold (1990 and later)
EGR modulating valve ahead of left wheel housing (1990 and later)
Page 309
371-61
Wiring Diagrams, Fuses and Relays
Fuel System
Connector Locations
H29-1 29-pln bUlkhead connector behind main fuse/relay panel (1991-1991 112)
H29-2 29-pin bulkhead connector behind main fuse/relay panel (1991-1991 112)
H29-3 29-pin bulkhead connector behind main fuse/relay panel (1991-1991 1/2)
H33-1 33-pin bulkhead connector behind main fuse/relay panel
(1991 112 and later)
H33-2 33-pin bulkhead connector behind main fuse/relay panei
(19911/2 and later)
H33-3 33-pin bulkhead connector behind main fuse/relay panel
(19911/2 and later)
1985-1990
204 LH test connector in engine compartment, behind right wheel housing
322 coding connector at the LH control unit 200, forward of r,t. door
347 diagnostic test connector under rear seat, right side
1991 and later
H1-9
H1-12
H1-16
H1-19
H2-13
H2-33
H3-14
H4-7
H6-1
H6-2
1-pln connector near lantJda sensor, right wheel housing
1-pln connector in engine compartment, right side near air intake
1-pin connector under center console next to shift selector (automatic)
1-pin connector near LH control unn, behind right A pillar trim
2-pin connector at the fuel pump in the storage area
2-pin connector near the lantJda sensor in the engine compartment
3-pin connector near LH control unn, behind right A pillar lrim
4-pin connector at the LH control unit, forward of right front door
6-pin connector in engine compartment right wheel housing
6-pin connector In engine compartment right wheel housing
Ground Locations
1985-1990
201
ground point for fuel injection at engine lifting lug, 2 points
1991 and later
G1
G3
G7
G25
ground point at radiator cross member
ground point in luggage compartment
ground point at engine lifting lug
ground point at gearbox
156
I
!
~
I
'1
(~
-
~~D.~
IO~~,~l
~
.......
-'I
Qzt
~.--~
75
22
~
144
132
229
\
\Pf
102
//
/
202
...-.
' - ....
fE[J
205
206
J
229
102
H4>~
\ "\"~
~
136
271
I
321
@
176
204
203
"JY
~
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~
200
94
~o II
(~~ , '"
t'
-'
101,103
'~ l~jItF~]
147
~
,
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f''. . I
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rf
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323
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~
Page 310
371-62
Wiring Diagrams, Fuses and Relays
LH 2.2 Fuel System
1985-1986 (all)
/'11986
11M
VT 1.0
/'11985
203
CHECK
ENGINE
'"
VL/Vl 0.75
.;
EZK
176
r.'-"
AC
156
"-L-,,
~
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57
67
201
.;
Q
0
130
m
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OR O.75r-1
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~
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~
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0
>
ai
~
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"
"
200
12
,
200
17
10 5
547.4.
SV 0.75
60
6 7
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,
/,
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"
"
ILl
$V 0.75
~
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5621.0
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559.4.
RO 2.5
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206
Z / Z-J
201
o
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