Page 271
Wiring Diagrams, Fuses and Relays
371-23
APe System
Operation
APC or Automatic Performance Control is used on turbo
models only. The APC system continuously monitors engine
detonation and adjusts the turbocharger boost pressure accordingly. This allows the engine to be run at a higher compression ratio for better fuel economy and throttle response.
See 291 Turbocharger for a complete system description
and repair information.
73
146
147
177
178
179
180
187
233
T5 I connector at main fuse/relay panel
Ignition ampl~ier in engine compartment, ieft bulkhead
ignition pulse amplifier in main fuse/relay panel (1986-1987)
APC control unit under back seat (1985). ahead of left wheel housing
(1986 and later)
knock sensor on engine block, below intake man~old
pressure boost solenoid valve on the radiator fan casing
boost pressure sensor behind instrument panel 10 the left of the steering column
vacuum pump for cruise controi
vacuum switch in engine compartment, left wheel housing
Connector Locations
Fault Tracing
1. Check fuse 10 and fuse 31 (where applicable).
1985-1990
2. On 1986 and later models, check that the brake light
switch is functioning correctly.
59
60
152A
152C
NOTE
On 1986 and later cars, the brake light switch cancels the APe
system when the brakes are applied, allowing the system to
operate at a reduced boost pressure.
3. Measure the resistance at the intake manifold pressure
sensor connector.
2-pin connector in the engine compartment left wheel housing
l-pin connector in the engine compartment
29 pole white bulkhead connector
29 pole black bUlkhead connector
1991 and later
H2-34
H29-1
H29-3
H33-1
H33-3
2-pin connector on the left wheel housing
29-pin wh~e bulkhead connector (1991-1991 1/2)
29-pin black bulkhead connector (1991-1991 1/2)
33-pin black bulkhead connector (1991 1/2 and later)
33-pin blue bulkhead connector (1991 1/2 and later)
Ground Locations
1985-1990
Intake manifold pressure sensor (180)
• resistance
5 to 13 ohms
7 ground point at radiator cross member
9 ground point in luggage compartment
93 ground point in left wheel housing
1991 and later
G1 ground point at radiator cross member
G6 ground distribution in main fuse/relay panel
G12 ground point in left wheel housing
Component Locations
5 ignition coil on radiator
29 brake light switch at the brake pedal
0
5
'7/
~
:~JIDDIDC}
(Ii . ' O.OC:J'
• .....
.
/
(?-~.C/
I~/
73
177
M1985
f
~.
;j
178
1'
,
.J
";
""--
29
147
? ~~:~
,
<
.
- .-
-
,
179
180
~
.A
.
233
6
~
Page 272
371-24
Wiring Diagrams, Fuses and Relays
APe System
1985
-54
',"
"llS
180
B~~~~
Ie,
BLOJ\
'8J
'8'
GN/RD10
SV 10
I
~
'0
122
2'A
BL15
28'
BL D 7)
~
'86
GR/RO IS
I
J I 152A
48\
8L/ROO?5
177
I
\ 1152A
'61
Gl/ v T l~,
z1986
-54
178
177
q7
')V1S
z
Page 273
Wiring Diagrams, Fuses and Relays
APe System
1987-1993
+54
+30
I
I
I
,..-..,
L
7.J
11G
WH 2.5
5C
486
131
RD/WH 1.0
GY 1.0
GY /RD 1.5
I 146 M88-M93
I
I
147 M87
152A
H29-1
H33-1
'T
131
2 RD 1.0
178
p
180
29
488
284
489
GN 05
BU 1.0
767
BN 0.5
483
WH 0.5
J17
Bf< 1.0
484
YE/RD 1.0
152C
H29-3
485
H29-1
152A
767
BU/RD 0.75
WH 0.75
490
16 17
25
4
23
20
13
483
Bf< 10
484
YE/RD 1.0
10
177
12
5
015H 472
A
481
YE/WH 1.5
~~
59
H2-34
Cruise Control
233
2
481B
p
YE/WH 15
-187
481A
481A
487
YE/WH 1.5
YE/WH 15
Bf< 1.5
179
482
Bf< 1.5
rt7
7
81
93
812
371-25
Page 274
371-26
Wiring Diagrams, Fuses and Relays
Backup Lights
Operation
Component Locations
Voltage is supplied to the backup light switch whenever the
key is on. When the transmission is in reverse and the key is
on, the switch closes to supply voltage to the backup lights.
Models with automatic transmission have a selector lever
switch that can be adjusted as described in 364 Electric Controls and Switches. Models with manual transmission have a
non-adjustable switch that screws into the side of the shift-lever housing. See 432 Manual Transmission Controls.
22
31
32
119
main fuse/relay panel
backup light switch under the center console
backup lights in rear light cluster
side reversing lights in the front light cluster
Connector Locations
1985-1990
152A 29-pin bulkhead connector in main fuse/relay panel
1991 and later
Fault Tracing
H29-' 29-pin bulkhead connector behind main fuse/relay panel (1991-19911/2)
H33-1 33-pin bulkhead connector behind main fuse/relay panel
(1991 1/2 and later)
1. Check fuse 13.
2. With the ignition key in the off position, check for resistance across the switch terminals. There should be
continuity with the transmission in reverse and no continuity when the transmission is taken out of reverse.
3. Check for voltage at the reverse lights with transmission in reverse and the key on.
Ground Locations
1985-1990
7 ground point at radiator cross member
9 ground point in luggage compartment
93 ground point at left wheel housing
1991 and later
G1 ground point at radiator cross member
G3 ground point in luggage compartment
G12 ground point at left wheel housing
Hatchback
4
-<°,/
-~~~-¥
~~--
'>~
------=- --- - - --
r'L
.~---
31
32
[]ill!l ,-,' -'.1:.,9
_
Page 275
Wiring Diagrams, Fuses and Relays
Backup Lights
M85-M86
M87 and later
149A SV 075
7
7
G1
7
93
912
1386 YT 0.75
138
6L!YT 1.0
+54
AUT
11M
VT 2.5
76
H29-1
H33-1
31
152A
31
~
136
VT 1.0
~
M85-M89 M90 and later
~---{
-_T6_
_ _---'-'13=6--'V'-'-T--'1-'-=.0'---
32
1'-
"" "
XM9Cj
'.0
137 VT 0.75
32
M89
-'.:13~7_V'--'T-'0"'_.7'_:_5'_____
1B9E SV 1.0
1B9D SV 1.0
9
3-D, 5-0
G3
._-----------_•..
_-,---~
32
.
2-D
4-0
L_~"._._.~
_32
_J
0lSHll~
~
371-27
Page 276
371-28
Wiring Diagrams, Fuses and Relays
Brake Lights
Operation
Component Locations
The brake lights are supplied voltage through the brake
light switch (29). When the brake pedal is depressed, the
brake light switch closes and completes the circuit to the
brake lights. The brake switch is mounted on the upper part of
the brake pedal and is adjustable. On 1986 and later models,
a center brake light is used. See 351 Lighting for information
on changing bulbs. For troubleshooting information on the
ASS warning lights see the Anti-lock Braking System (ABS)
wiring diagram.
Fault Tracing
22
29
30
109
main fuse/relay panel
brake light switch at the brake pedal
brake lights in the rear clusters
third (center) brake light
Connector Locations
1985-1990
57
59
60
123
152A
3-pin connector (hatchback only) in the luggage compartment
2-pin connector in the luggage compartment
1-pin connector in luggage compartment at the rear light
4-pin connector at hatchback, left side
29-pin bulkhead connector at main fuse/relay panel
1. Check fuse 31.
1991 and later
2. Check for voltage at the brake light switch. Check for
voltage at the brake light sockets when the brake pedal
is depressed.
H2-17 2-pin connector at hatchback left side, or on sedan under parcel shelf
H2-18 2-pin connector at hatchback, left side
H2-42 2-pin connector at luggage compartment lid
H2-43 2-pin connector at left hinge, convertible
H3-13 3-pin connector in luggage compartment, left air oullet
H4-12 4-pin connector in trunk lid, left air oullet
H29-1 29-pin bulkhead connector behind main fuse/relay panel (1991-19911/2)
H33-1 33-pin bulkhead connector behind main fuse/relay panel
(1991 1/2 and later)
NOTE
A wooden rod can be used to hold the brake pedal down during troubleshooting.
Ground Locations
3. Check the adjustment of the brake light switch. The
brake lights should come on when the brake pedal is
depressed 10 mm (0.4 in.) or more. If necessary, adjust
the switch as described in 364 Electric Controls and
Switches.
1985-1990
9 ground point in luggage compartment
1991 and later
G3
G5
G9
G19
ground point in luggage compartment
ground point under the rear seat
ground point in luggage compartment
ground point in hatchback
"',p
_
----
c
9
··
29
US,CA,.I,IP
AU M~,FE
Hatchback
30
109(Conv)
'---
109
Sedan
30
US,CA,JP
AU,ME,FE
Page 277
371-29
Wiring Diagrams, Fuses and Relays
Brake Lights
1985-1989
+30
I
0
I
I
3-D, 5-D: US,CA
JP,AU,ME,FE
1.320 RO 0.75
~
~
22A I
109
.31
I
189E Sv 0.75
M85-M86
M8l-M89
60
0
.....
>
15
CO>
'"
;;;
189A SV 0.75
lJ2A
o 1.5
29
30
30
132A
RO 1.5
1890 SV 10
3-D, 5-0
132 RO 1.0
2-D 4-0
132 RO 1.0
59
132 RO 1.0
109
109
59
II)
.....
o
o
a::
SE,FI,GB,US,CA
JP,AU,ME,FE
~
l8ge
SV 0.75
SE,FI,GB,US,CA
JP,AU,ME,FE
132A RO 0.75
269(ME FE AU)
133 RO 0.75
372 BL RO 1.5
189 SV 1.5
30
30
2-D, 4-0
0150 003
A
Page 278
371-30
Wiring Diagrams, Fuses and Relays
Brake Lights
1990-1993
3-D, 5-0: US,CA
JP,AU,ME,FE
1328 RD 0.75
30
15
189A SV 0.75
132A
RD 0.75
109
132C RD 0.75
H2-18
59
29
9
G3
o
133 RD 0.75
109
132A RD 0.75
-
SE,FI,EU,GB
I
189D SV 0.75
211A
SV 1.5
189D SV 1.0
189E SV 1.0
3-D, 5-0
132
RD 1.0
132A RD 0.75
2-D 4-0
59
H2-43
132A RD 0.75
59
109
H2-42
189C
SV 0.75
133 RD 0.75
(US.CA.JP.
~
1328 RD 075
133A RD 0.75
189 SV 1.5
M91
r-----_" "
9
30
2-D, 4-0
30
G3
c'"
,);,V 1.0
109
Page 279
371-31
Wiring Diagrams, Fuses and Relays
Burglar Alarm
Operation
The burglar alarm consists of a control unit, a main switch, a
siren, switches in the doors, hood, and luggage compartment,
and a remote control unit. On some later models, a motion detector, a glass breakage detector, a service-mode switch, and
a rear seat switch are used. The alarm system is integrated
with the central locking system. See the Central Locking wiring diagram found later in this repair group.
Fault Tracing
1. Check the fuses.
2. Check that the batteries in the remote control unit are
good condition. Replace the batteries if in doubt.
3. Check the function of the LED on the left speaker grille.
4. Check all switches for proper operation.
56
1985-1990
57A
578
570
57E
58
59
60
3-pin white connector
3-pin red connector
3-pin green connector
3-pin blue connector
12-pin connector behind instrument panel to the left of the steering column
2-pin connector in luggage compartment near left hinge
1-pin connector (3) one for the alarm siren in engine compartment, two
under left speaker grille for the LEOs
122 8-pin connector for alarm under the rear seat
123 4-pin connector one in each 8 pillar
152A 29-pin bulkhead connector at main fuse/relay panel
H1-18 1-pin connector under center console
H1-21 1-pin connector for LED, under left speaker grille
H1-22 1-pin connector for LED, under left speaker grille
H1-28 1-pin connector under rear seat
H2-40 2-pin connector for the alarm siren, behind headlamp
H2-41 2-pin connector under passenger seat, right side
H2-42 2-pin connector in trunk lid
H2-43 2-pin connector at left hinge, convertible
H2-53 2-pin connector under the rear seat
H8-3 8-pin connector under the rear seat
H10-8 10-pin connector under rear seat at alarm control unit
H12-1 12-pin connector behind instrument panel, left of steering column
H33-1 33-pin bulkhead connector behind main fuse/relay panel (1991 1/2
and later
battery at right front of engine compartment
starter motor under intake manifold
ignition switch
main fuse/relay panel in left wheel housing
left-hand direction indicator lamps
right-hand direction indicator lamps
interior light switch in center console
door switches on the door jamb
luggage compartment light in storage area
luggage compartment light switch in storage area
neutral/safety switch (automatics only) at gear selector lever
seatben warning relay under the rear seat
interior lighting time delay relay under the rear seat
fuse for burglar alarm under rear seat
alarm siren in engine compartment near right headlamp
alarm hood switch under the hood at front of wheel housing
alarm switch at center console
alarm control unit under the rear seat
alarm motion detector under the rear seat
alarm LED at left speaker grille
alarm relay under the rear seat
alarm seat switch in driver seat
alarm seat switch in passenger seat
alarm diode under the rear seat in the wiring harness
auxiliary fuse/relay panel under rear seat
alarm service mode switch under left side passenger seat
54
Connector Locations
1991 and later
Component Locations
,
4
20
22A
27
28
53
54
55
56
77
82
151
274
275
276
288
289
304
305
313
314
315
316
401
412
413 alarm glass breakage detector under passenger seat
423 alarm start interlock relay (convertible) under rear seat
424 alarm hazard warning light relay (convertible) under rear seat at the
control unit
425 door lock switch in center console
426 switch for rear seat under the rear seat
,
Ground Locations
1985-1990
117 ground point at the handbrake
1991 and later
G1 ground point at radiator cross member
G4 ground point between ignition switch and handbrake
G5 ground point under the rear seat
G5 ground point under the rear seat
G25 ground point at the gearbox
289
275
82
Ii
276
151
82
313
314,315
'<
I
40---:..:1A~_1.:...:5:...:1_......J~
'-4.;. :O:. . ;1_ _
Page 280
371-32
Wiring Diagrams, Fuses and Relays
Burglar Alarm-ex. Convertible
1985-1986
~
13,234,81
43
BL 075
41 ...
GN/RO 10
44
GN 075
13.234,81
HOOD
60
60
674
GL 075
679
BR 075
45
GN 075
42
BL 0.75
7
GR 2.5
7 GR 25
695 BL 0.75
30
o
289
I!
20
5~V
l!:::!t'::::=====-------;;;687"';'
677
SV 0.75
171
5V 075
075
676
VT 075
60
65
167B
5V 0.75
60
~
288
ON/Off
'67 SV 0.75
171 SV 075
53
167[
SV 0.75
167E SV 075
54
54
42
BL 075
44 GN 075
14
14,15
I 87522'