Technical

1977-1978 Wiring and Vacuum Diagrams

01 - Fuse Panel
02 - Lamp Bulb Data
03 - Printed Circuit (Tell-Tale Cluster)
04 - Vacuum Circuits
05 - Air Conditioner & Heater Wiring Circuit
06 - Cruise Control Wiring Circuit
07 - Diesel Glow Plug Wiring Circuit
08 - Electronic Load Leveler Wiring Circuit
09 - Electronic Spark Selction System Wiring Circuit
10 - Fuel Economy Indicator System Wiring Circuit
11 - Guide-Matic Wiring Circuit
12 - Illuminated Door Locks Wiring Circuit
13 - Power Seat Back Recliner Wiring Circuit
14 - Power Door Locks Wiring Circuit (Except Automatic)
15 - Power Door Locks Wiring Circuit (Automatic)
16 - Power Sun Roof Wiring Circuit
17 - Power Trunk Release Wiring Circuit
18 - Power Seats Wiring Circuit (Six Way)
19 - Rear Window Defogger Wiring Circuit
20 - Power Windows Wiring Circuit
21 - Power Trunk Closing Unit
22 - Seat Belt Warning Wiring Circuit
23 - Theft Deterrent Wiring Circuit
24 - Windshield Wiper Wiring Circuit (Controlled Cycle)
25 - Twilight Sentinel Wiring Circuit
26 - Electronic Fuel Injection Wiring Circuit
27 - Trip Computer Wiring Circuit
28 - Body Wiring Circuit
29 - Chassis Wiring Circuit 1977
30 - Chassis Wiring Circuit 1978

01 - Fuse Panel

Back to the top

Flasher Location
In the fuse block

Fuse Block Location
Under dash panel, left of steering column.

Circuit Brakers

Headlights	Headlight Switch	C.B.
Sun Roof	Circuit	C.B.
W/S Wiper	W/S Wiper Motor	C.B.
Read Defogger (grid type)	Lower Steering Column	C.B.
Twilight Sentinel	Integral W/Amplifier	C.B.

Figure 1-1 - Fuse Panel

02 - Lamp Bulb Data

Back to the top

Location

Function	Bulb number
A/C Control	194
Accessoiry Switch & Ash Tray Lights	1445
Back-up Lights	1156
Clock	1895
Cornering Lights	1156
Courtesy Lights
Doors & Dome Lights	562
Reading & Map Lights	1004
Instrument Panel	906
Cruise Control Switch & Indicator Lights	161
Door Lock Lights	558
Fuel Economy Indicator	161
Glove Box Light	1816
Headlights
Outer	4652
Inner	4651
Headlight Switch	1816
High Beam Indicator	194
Instrument Cluster Lights	194
License Plate Light	194
Park & Turn Signal
1977	1157NA
1978	1157
Radio Dial Light	1895
Rear Defogger Indicator	1445
Shift Indicator	161
Side Marker Lights
Front	194A
Rear	194
Stop, Tail & Turn Signal Light	1157
Tell Tale & Warning Lights	194
Trunk Light	1003
Trunk Open Indicator	161
Turn Signal Indicator	194
Vanity Mirror	562
W/S Washer Fluid Indicator	161
W/S Wiper Switch Light	194

03 - Printed Circuit (Tell-Tale Cluster)

Back to the top

Figure 3-1 - Printed Circuit (Tell-Tale Cluster)

Figure 3-2 - Printed Circuit (Speedometer Cluster)

04 - Vacuum Circuits

Back to the top

Figure 4-1 - Air Conditioner & Heater Vacuum Circuit

Figure 4-2 - Engine Vacuum Circuit. 1977 Seville Except Calif.

Figure 4-3 - Complete Vacuum Circuit. 1977 Seville Calif.

Figure 4-4 - Engine Vacuum Circuit. 1978 Seville Except Calif.

Figure 4-5 - Complete Vacuum Circuit. 1978 Seville Calif.

05 - Air Conditioner & Heater Wiring Circuit

Back to the top

Figure 5-1 - Air Conditioner & Heater Wiring Circuit. 1977-78 Seville

06 - Cruise Control Wiring Circuit

Back to the top

Figure 6-1 - Cruise Control Wiring Circuit. 1977 Seville

Figure 6-2 - Cruise Control Wiring Circuit. 1978 Seville

07 - Diesel Glow Plug Wiring Circuit

Back to the top

Figure 7-1 - Diesel Glow Plug Wiring Circuit. 1978

08 - Electronic Load Leveler Wiring Circuit

Back to the top

Figure 8-1 - Electronic Load Leveler Wiring Circuit. 1978

09 - Electronic Spark Selction System Wiring Circuit

Back to the top

Figure 9-1 - Electronic Spark Selction System Wiring Circuit. 1978

10 - Fuel Economy Indicator System Wiring Circuit

Back to the top

Figure 10-1 - Fuel Economy Indicator System Wiring Circuit. 1977-78

11 - Guide-Matic Wiring Circuit

Back to the top

Figure 11-1 - Guide-Matic Wiring Circuit. 1977-78

12 - Illuminated Door Locks Wiring Circuit

Back to the top

Figure 12-1 - Illuminated Door Locks Wiring Circuit. 1977-78

13 - Power Seat Back Recliner Wiring Circuit

Back to the top

Figure 13-1 - Power Seat Back Recliner Wiring Circuit. 1977


Figure 13-2 - Power Seat Back Recliner Wiring Circuit. 1978

14 - Power Door Locks Wiring Circuit (Except Automatic)

Back to the top

Figure 14-1 - Power Door Locks Wiring Circuit (Except Automatic). 1978

15 - Power Door Locks Wiring Circuit (Automatic)

Back to the top

Figure 15-1 - Power Door Locks Wiring Circuit (Automatic). 1977


Figure 15-2 - Power Door Locks Wiring Circuit (Automatic). 1978

16 - Power Sun Roof Wiring Circuit

Back to the top

Figure 16-1 - Power Sun Roof Wiring Circuit. 1977


Figure 16-2 - Power Sun Roof Wiring Circuit. 1978

17 - Power Trunk Release Wiring Circuit

Back to the top

Figure 17-1 - Power Trunk Release Wiring Circuit. 1978

18 - Power Seats Wiring Circuit (Six Way)

Back to the top

Figure 18-1 - Power Seats Wiring Circuit (Six Way). 1977-78

19 - Rear Window Defogger Wiring Circuit

Back to the top

Figure 19-1 - Rear Window Defogger Wiring Circuit. 1977-78


Figure 19-2 - Rear Window Defogger Wiring Circuit (Blower Type). 1977-78

20 - Power Windows Wiring Circuit

Back to the top

Figure 20-1 - Power Windows Wiring Circuit. 1977


Figure 20-2 - Power Windows Wiring Circuit. 1978

21 - Power Trunk Closing Unit

Back to the top

Figure 21-1 - Power Trunk Closing Unit. 1977-78

22 - Seat Belt Warning Wiring Circuit

Back to the top

Figure 22-1 - Seat Belt Warning Wiring Circuit. 1977-78

23 - Theft Deterrent Wiring Circuit

Back to the top

Figure 23-1 - Theft Deterrent Wiring Circuit. 1977-78

24 - Windshield Wiper Wiring Circuit (Controlled Cycle)

Back to the top

Figure 24-1 - Windshield Wiper Wiring Circuit (Controlled Cycle). 1977-78

25 - Twilight Sentinel Wiring Circuit

Back to the top

Figure 25-1 - Twilight Sentinel Wiring Circuit. 1977-78

26 - Electronic Fuel Injection Wiring Circuit

Back to the top

Figure 26-1 - Electronic Fuel Injection Wiring Circuit. 1977


Figure 26-2 - Electronic Fuel Injection Wiring Circuit. 1978

27 - Trip Computer Wiring Circuit

Back to the top

Figure 27-1 - Trip Computer Wiring Circuit. 1978

28 - Body Wiring Circuit

Back to the top

Figure 28-1 - Body Wiring Circuit. 1977


Figure 28-2 - Body Wiring Circuit. 1978

29 - Chassis Wiring Circuit 1977

Back to the top

Component GridLocator

Nomenclature	Location
A/C Compressor Clutch Coil	B-2
A/C Compressor Cycling Switch	B-2
A/C Low Pressure Switch	A-2
Accessory Switch Lamp	E-7
Ambient Sensor	A-4
Antenna Components	B-3, B-4
Ashtray assembly	D-8
ATC programmer & control head	A-5, B-5
ATC auto blower relay	A-3
ATC in-car sensor	B-8
Back up lamp switch	D-5
Battery	A-2
Blower motor	A-3
Clock	B-9
Cornering lamp switch	E-4
Courtesy lamp (left hand)	A-7
Courtesy lamp (right hand)	D-7
Cylinder head metal temperature heater switch	B-2
Cruise control circuit connector	C-8
Distributor	A-2
Down shift switch	D-5
Economy meter	B-3
E.F.I. Feed	E-5
Engine coolant temperature switch	C-2
Engine metal temperature switch	B-2
Fuse block	A-6
Generator	A-1
Glove box lamp	D-7
Hazard warning switch	E-4
Headlamp switch	A-9
Headlamp dimmer switch	D-4
Headlamps	C-1, D-1
Horn relay	D-2
Ignition key alarm & switch	D-4, E-4
Instrument panel ground	E-7
Key warning buzzer	D-6
Low brake warning switch	E-3
Oil pressure switch	C-3
Parking brake switch	D-4
Parking lamps (left hand)	E-1
Parking lamps (right hand)	B-1, C-1
Radio	C-9
Seat belt warning chimes & timer	D-7, D-8
Speakers	B-8
Speedometer cluster & connector	D-9
Starter motor	B-1
Stop lamp switch	D-5
Telltale cluster	C-8
Transmission downshift coil	C-2
Turn signal flasher	E-4
Twilight Sentinel amplifier connector	A-8
Twilight Sentinel Photocell	A-9
Twilight Sentinel potentiometer	A-9
Washer fluid level switch	C-2
Windshield pulse, wipe & washer assembly	D-2
Windshield washer switch
Windshield wiper switch	E-9

Figure 29-1 - Chassis Wiring Circuit. 1977

30 - Chassis Wiring Circuit 1978

Back to the top

Component GridLocator

Nomenclature	Location
A/C Compressor Clutch Coil	B-2
A/C Compressor Cycling Switch	A-2
A/C Low Pressure Switch	B-2
Accessory Switch	D-9
Ambient Sensor	A-6
Antenna Components	B-4, B-5
Ashtray Assembly	D-9
ATC Programmer & Control Head	A-6
ATC Auto Blower Relay	A-3
ATC In-Car Sensor	C-9
Back-Up Lamp Switch	D-7
Battery	A-2
Blower Motor	A-3
Clock	B-10
Cornering Lamps	B-2, E-2
Cornering Lamp Switch	E-5
Courtesy Lamp (left hand)	A-8
Courtesy Lamp (right hand)	D-9
Cylinder Head Metal Temperature Heater Switch	B-2
Cruise Control Circuit Connector	C-9
Distributor	A-2
Down Shift Switch	D-6
Economy Meter	B-2
E.F.I. Feed	D-6
Engine Coolant Temperature Switch	C-2
Engine Metal Temperature Switch	C-3
ESS Decoder	B-3
Exgouse Solenoid	D-3
Fuse Block	A-7
Generator	A-1
Glove Box Lamp	D-9
Hazard Warning Switch	E-5
Headlamp Switch	A-10
Headlamp Dimmer	D-5
Headlamps	C-1, D-1
Horns	D-2
Horn Contacts & Relay	D-5, E-7
Idle Stop Solenoid	A-2
Ignition Key Alarm & Switch	E-5
Key Warning Buzzer	D-7
Low Brake Warning Switch	E-3
Marker Lamps	B-2, E-2
Oil Pressure Switch	C-2
Parking Brake Switch	D-6
Parking Lamps (left hand)	E-1
Parking Lamps (right hand)	C-1
Radio	B-10
Seat Belt Warning Chimes & Timer	D-9
Speedometer Cluster & Connector	D-10
Starter Motor	B-1
Stop Lamp Switch	D-7
Tell-Tale Cluster	C-10
Transmission Downshift Coil	C-2
Turn Signal Flasher	E-6
Twilight Sentinel Amplifier Connector	A-9
Twilight Sentinel Photocell	A-11
Twilight Sentinel Potentiometer	A-10
Washer Fluid Level Switch	C-2
Windshield Pulse, Wipe & Washer Assembly	C-2
Windshield Wiper/Washer switch	E-10

Figure 30-1 - Chassis Wiring Circuit. 1978

Technical topics