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1988 GMC Chevrolet Light Truck Complete Wiring Diagram Manual

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Covers: 1988 GM, GMC, Chevy Light Duty Truck Wiring Diagrams

  • R-V Models: Pickup, Bonus/Crew Cab, Suburban, Chassis Cab, Utility, Blazer (Jimmy)
  • G Van Models: Rally (Sportvan), Cutaway Van, Extended Van, Vandura (Chevy Van), Magnavan (Hi-Cube Van)
  • M Van Models: Passenger Van, Cargo Van
  • P Models: Value Van Motor Home Chassis, Foreword Control Chassis
  • C/K Models: CK Pickup Sportside, CK Chassis Cab, CK Pickup Extended Cab, CK Chassis Extended Cab
  • S/T Models: S/T Pickup Regular Cab, S/T Chassis Cab, S/T Pickup Extended Cab, S/T Utility Vehicle (Jimmy)

Pages: 454
Format: PDF
Compatibility: Windows/Mac/Tablet

Topics in the 1988 GMC Chevrolet Light Truck Complete Wiring Diagram Manual:

1988 C/K TRUCK
2 POWER DISTRIBUTION (GASOLINE) 34 ELECTRONIC CONTROL MODULE (ECM)-OUTPUTS (DIESEL)
3 POWER DISTRIBUTION (DIESEL) 36 ECM CHART (DIESEL)
4 AUXILIARY BATTERY(RPO TP2) 38 AUTO TRANSMISSION KICKDOWN SOLENOID (M40)
5 FUSE BLOCK 39 HEATER
6 CONVENIENCE CENTER 40 AIR CONDITIONING
7 HEADLAMPS & PARKING LAMPS (BASE) 42 BRAKE WARNING SYSTEM
8 HEADLAMPS & PARKING LAMPS (QUAD) 43 INSTRUMENT PANEL LAMPS (ELECTRONIC)
9 MARKER LAMPS (QUAD ONLY) 44 INDICATOR LAMPS (ELECTRONIC)
11 ROOF MARKER LAMPS 46 SEAT BELT WARNING BUZZER
12 HAZARD LAMPS 47 FOUR WHEEL DRIVE INDICATOR
14 DIRECTIONAL LAMPS 48 DOME LAMPS
16 HORNS 49 CONVENIENCE LIGHTING PACKAGE
17 START 50 CARGO LAMP
18 START (DIESEL) 51 RADIO EQUIPMENT
19 IGNITION 52 RADIO EQUIPMENT
20 THROTTLE BODY INJECTION 53 POWER WINDOWS
21 HOT FUEL HANDLING 54 REAR DEFOGGER
22 GLOW PLUGS (DIESEL) 55 POWER DOOR LOCKS
24 ENGINES CONTROLS (DIESEL) 56 WIPER/WASHER
26 FUEL CONTROL & IDLE AIR CONTROL 57 CRUISE CONTROL
27 AUXILIARY COOLING FAN 58 REAR WHEEL ANTI-LOCK
29 ELECTRONIC CONTROL MODULE (ECM)-INPUTS 59 BACK-UP LAMPS
30 ELECTRONIC CONTROL MODULE (ECM)-OUTPUTS 61 END GATE & SIDE CLEARANCE LAMPS
32 ECM CHART 62 TAIL LAMPS
33 ELECTRONIC CONTROL MODULE (ECM)-INPUTS (DIESEL) 64 LICENSE LAMPS

1988 G VAN
2 POWER DISTRIBUTION (GASOLINE) 42 TRANSMISSION CONVERTER CLUTCH DETENT SOLENOID
3 POWER DISTRIBUTION (DIESEL) 43 AUTO TRANSMISSION KICKDOWN SOLENOID (M40)
4 FUSE BLOCK DETAIL 44 AIR CONDITIONING (C60)
5 HEAD LAMPS & PARKING LAMPS 45 REAR AIR CONDITIONING (C69)
6 MARKER LAMPS 46 HEATER
8 HAZARD LAMPS 47 AUXILIARY HEATER (C36)
10 DIRECTIONAL LAMPS 48 BRAKE WARNING SYSTEM
12 HORN(S) 49 BRAKE WARNING SYSTEM (UJ1)
13 START (6 CYL.) LB4, (8 CYL.) L03, L05, L19 50 INSTRUMENT PANEL LAMPS (TELLTALE VERSION)
14 START (8 CYL.) LT9 & NB2 51 INSTRUMENT PANEL LAMPS (GAGE VERSION)
15 START (8 CYL.) LT9 & NA5 52 INSTRUMENT PANEL GAGES (TELLTALE VERSION)
17 START (DIESEL) LL4, LH6 54 INSTRUMENT PANEL GAGES (GAGE VERSION)
18 IGNITION (6 CYL.) LB4 56 INDICATOR LAMPS (TELLTALE VERSION)
20 IGNITION (8 CYL.) L03, L05, L19 58 INDICATOR LAMPS (GAGE VERSION)
22 IGNITION (8 CYL.) LT9 & NB2 60 DOME LAMPS
23 IGNITION (8 CYL.) L19 & NA5 61 AUXILIARY LIGHTING (TR9) STEPWELL & READING LAMP
24 THROTTLE BODY INJECTION 62 RADIO EQUIPMENT (STEREO) (UN3, UN8, UM6)
25 HOT FUEL HANDLING 63 RADIO EQUIPMENT (U63)
26 GLOW PLUGS (DIESEL) 64 SEAT BELT WARNING BUZZER
28 ENGINE CONTROLS (DIESEL) 65 POWER WINDOWS (A31)
30 FUEL CONTROL & IDLE AIR CONTROL (6 CYL.) LB4, (8 CYL.) L03, 66 POWER DOOR LOCKS (AU3)
L05, L19 67 POWER DOOR LOCKS WITH DELAY MODULE (U3)
31 EMISSION CONTROLS (8 CYL.) LT9 & NA5 68 WIPER/WASHER
32 ELECTRONIC CONTROL MODULE (ECM)-INPUTS (6 & 8 CYL.) 69 PULSE WIPER/WASHER (CD4)
34 ELECTRONIC CONTROL MODULE (ECM)-OUTPUTS (6 & 8 CYL.) 71 CRUISE CONTROL (K34)
36 ECM CHART (6 & 8 CYL.) 72 BACK-UP LAMPS
37 ELECTRONIC CONTROL MODULE (ECM)-INPUTS (DIESEL) 74 TAIL LAMPS
38 ELECTRONIC CONTROL MODULE (ECM)-OUTPUTS (DIESEL) 76 LICENSE LAMP(S)
ECM CHART (DIESEL)
AUXILIARY COOLING FAN
78 TRAILER WIRING

1988 S/T TRUCK
2 POWER DISTRIBUTION (LL2) 51 FOUR-WHEEL DRIVE INDICATOR
3 POWER DISTRIBUTION (LN8, LB4) 52 AIR CONDITIONING (4 CYL.)
4 FUSE BLOCK DETAIL 53 AIR CONDITIONING (6 CYL.) LL2, LB4
5 HEAD LAMPS & PARKING LAMPS 54 HEATER
6 MARKER LAMPS 55 BRAKE WARNING SYSTEM
8 HAZARD LAMPS 56 INSTRUMENT PANEL LAMPS (TELLTALE VERSION)
12 DIRECTIONAL LAMPS 57 INSTRUMENT PANEL LAMPS (GAGE VERSION)
16 HORNS 58 INSTRUMENT PANEL GAGES (TELLTALE VERSION)
17 START (4 CYL.) 60 INSTRUMENT PANEL GAGES (GAGE VERSION)
18 START (6 CYL.) LL2 62 INDICATOR LAMPS (TELLTALE VERSION)
19 START (6 CYL.) LB4 64 INDICATOR LAMPS (GAGE VERSION)
20 IGNITION (4 CYL.) 66 DOME LAMPS
22 IGNITION (6 CYL.) LL2 69 INSTRUMENT PANEL COURTESY LAMPS (03 -5 3 MODELS)
24 IGNITION (6 CYL.) LB4 70 RADIO EQUIPMENT (STEREO) (UM2, UM3, U58)
26 THROTTLE BODY INJECTION (4 CYL.) 71 RADIO EQUIPMENT
27 THROTTLE BODY INJECTION (6 CYL.) 72 POWER WINDOWS (A31)
28 FUEL CONTROL & IDLE AIR CONTROL (4 CYL.) 73 POWER DOOR LOCKS (AU3)
29 FUEL CONTROL & IDLE AIR CONTROL (6 CYL.) LL2 74 l/P COMPARTMENT BOX LAMP (TR9)
30 FUEL CONTROL & IDLE AIR CONTROL (6 CYL.) LB4 75 SEAT BELT WARNING BUZZER
31 FUEL SENSOR 76 VANITY MIRROR (D64)
32 ELECTRONIC CONTROL MODULE (ECM)-INPUTS (4 CYL.) 77 WIPER/WASHER
34 ELECTRONIC CONTROL MODULE (ECM)-OUTPUTS (4 CYL.) 78 CRUISE CONTROL (K34)
37 ECM CHART (4 CYL.) 79 REAR DEFOGGER (C49)
38 ELECTRONIC CONTROL MODULE (ECM)-INPUTS (6 CYL.) LL2 80 LIFTGATE RELEASE (AU6)
40 ELECTRONIC CONTROL MODULE (ECM)-OUTPUTS (6 CYL.) LL2 81 CARGO LAMP (UF2)
43 ECM CHART (6 CYL.) LL2 82 BACK-UP LAMPS
44 ELECTRONIC CONTROL MODULE (ECM)-INPUTS (6 CYL.) LB4 84 TAIL LAMPS
46 ELECTRONIC CONTROL MODULE (ECM)-OUTPUTS (6 CYL.) LB4 86 LICENSE LAMP(S)
49 ECM CHART (6 CYL.) LB4 88 TRAILER WIRING
50 TRANSMISSION CONVERTER CLUTCH DETENT SOLENOID 89 HEAVY DUTY TRAILER WIRING (UY7)

1988 R/V TRUCK
2 POWER DISTRIBUTION (GASOLINE) 48 ECM CHART (DIESEL)
4 POWER DISTRIBUTION (DIESEL) 49 ELECTRONIC CONTROL MODULE (ECM)-INPUTS (DIESEL)
5 AUXILIARY BATTERY (TP2) 50 ELECTRONIC CONTROL MODULE (ECM)-OUTPUTS (DIESEL)
7 FUSE BLOCK DETAIL 52 TRANSMISSION CONVERTER CLUTCH DETENT SOLENOID
8 HEAD LAMPS & PARKING LAMPS 53 AUTOMATIC TRANSMISSION KICKDOWN SOLENOID (M40)
10 MARKER LAMPS 54 AIR CONDITIONING (C60)
13 ROOF MARKER LAMPS 55 REAR AIR CONDITIONING (C69)
14 HAZARD LAMPS 56 HEATER
17 DIRECTIONAL LAMPS 57 AUXILIARY HEATER (C36)
20 HORNS 59 INSTRUMENT PANEL LAMPS
21 START (6 CYL.) L25, (8 CYL.) LE8, LT9 60 INSTRUMENT PANEL GAGES
22 START (8 CYL.) L05, L19 62 INDICATOR LAMPS
23 START (DIESEL) LL4, LH6 64 SEAT BELT WARNING BUZZER
24 IGNITION (6 CYL.) L25 65 BRAKE WARNING SYSTEM
25 IGNITION (8 CYL.) LE8, LT9 66 FOUR-WHEEL DRIVE INDICATOR LAMP
26 IGNITION (8 CYL.) L05, LT9 68 DOME LAMPS
28 THROTTLE BODY INJECTION 69 CARGO LAMP (UF2)
29 HOT FUEL HANDLING 70 RADIO EQUIPMENT (UM6, UP8)
30 GLOW PLUGS (DIESEL) 71 RADIO EQUIPMENT (U63)
32 ENGINE CONTROLS (DIESEL) 72 POWER WINDOWS (A31)
34 FUEL CONTROL & IDLE AIR CONTROL (8 CYL.) L05, L19 74 POWER REAR WINDOW (A33)
35 AUXILIARY COOLING FAN 75 REAR DEFOGGER (C49)
36 AUXILIARY FUEL TANK (NL2J/FUEL TANK SELECTOR SWITCH 76 POWER DOOR LOCKS
38 EMISSION CONTROLS 78 WIPER/WASHER
43 ELECTRONIC CONTROL MODULE (ECM)-INPUTS (8 CYL.) 79 PULSE WIPER/WASHER (CD4)
L05, L19 81 BACKUP LAMPS
44 ELECTRONIC CONTROL MODULE (ECM)-OUTPUTS (8 CYL.) 84 TAIL LAMPS
L05, L19 88 LICENSE LAMPS
47 ECM CHART (8 CYL.) 92 CAMPER & TRAILER WIRING

1988 P CHASSIS
2 POWER DISTRIBUTION (6 CYL.) 25 EMISSION CONTROLS (6 CYL.)
3 POWER DISTRIBUTION (8 CYL.) 26 EMISSION CONTROLS (8 CYL.)
7 POWER DISTRIBUTION (DIESEL) 27 EMISSION CONTROLS (DIESEL)
8 FUSE BLOCK DETAILS 28 ENGINE CONTROLS (DIESEL)
10 HEAD LAMPS & PARKING LAMPS 29 GLOW PLUGS (DIESEL)
11 MARKER LAMPS 30 ELECTRONIC CONTROL MODULE (ECM)-INPUTS (8 CYL.)
12 HAZARD LAMPS 32 ELECTRONIC CONTROL MODULE (ECM)-OUTPUTS (8 CYL.)
13 DIRECTIONAL LAMPS 34 ECM CHART (8 CYL.)
14 HORNS 35 AUTO TRANSMISSION KICKDOWN SOLENOID (M4Q)
15 WIPER/WASHER 36 BRAKE WARNING SYSTEM
16 START/IGNITION (6 CYL.) 38 INSTRUMENT PANEL LAMPS
17 START/IGNITION (8 CYL.) 39 INSTRUMENT PANEL GAGES
19 START/IGNITION (DIESEL) 40 INDICATOR LAMPS
23 THROTTLE BODY INJECTION 42 BACKUP LAMPS
24 FUEL CONTROL & IDLE AIR CONTROL (8 CYL.) 43 TAIL LAMPS
44 LICENSE LAMPS

1988 M VAN
2 POWER DISTRIBUTION 41
3 POWER DISTRIBUTION (ELECTRONIC CLUSTER ONLY) 42
4 FUSE BLOCK DETAIL 43
5 FUSE BLOCK DETAIL (ELECTRONIC CLUSTER ONLY) 44
6 HEAD LAMPS & PARKING LAMPS 45
7 MARKER LAMPS 46
8 HAZARD LAMPS 48
10 DIRECTIONAL LAMPS 50
12 FOG LAMPS (ANL) 52
13 HORNS 54
14 START (4 CYL.) 56
15 START (6 CYL.) 57
16 IGNITION (4 CYL.) 58
18 IGNITION (6 CYL.) 60
20 THROTTLE BODY INJECTION (4 CYL.) 61
21 THROTTLE BODY INJECTION (6 CYL.) 62
22 FUEL CONTROL & IDLE AIR CONTROL (LN 8 -4 CYL.) 63
23 FUEL CONTROL & IDLE AIR CONTROL (LB4-V6) 64
24 ELECTRONIC CONTROL MODULE (ECM)-INPUTS (LN 8 -4 CYL.) 65
26 ELECTRONIC CONTROL MODULE (ECM)-OUTPUTS (LN8- 4 CYL.) 66
29 ECM CHART (LN 8 -4 CYL.) 67
30 ELECTRONIC CONTROL MODULE (ECM)-INPUTS (LB4-V6) 68
32 ELECTRONIC CONTROL MODULE (ECM)-OUTPUTS (LB4- V6) 69
35 ECM CHART (LB4-V6) 70
36 TRANSMISSION CONVERTER CLUTCH DETENT SOLENOID 71
37 REAR AIR CONDITIONING (C69) 72
38 AIR CONDITIONING (LN 8 -4 CYL.) 73
39 AIR CONDITIONING (LB4-V6) 74
40 HEATER
DESCRIPTION
AUXILIARY HEATER (C36)
BRAKE WARNING SYSTEM
INSTRUMENT PANEL LAMPS (TELLTALE VERSION)
INSTRUMENT PANEL LAMPS (GAGE VERSION)
INSTRUMENT PANEL LAMPS (ELECTRONIC CLUSTER)
INSTRUMENT PANEL GAGES (TELLTALE VERSION)
INSTRUMENT PANEL GAGES (GAGE VERSION)
INDICATOR LAMPS (TELLTALE VERSION)
INDICATOR LAMPS (GAGE VERSION)
INDICATOR LAMPS (ELECTRONIC CLUSTER)
DOME LAMPS
LIGHTING PACKAGES-(C95) (DK6)
LIGHTING PACKAGE (TR9)
RADIO EQUIPMENT (STEREO) (UU9, UM7, UM6, UX1)
RADIO EQUIPMENT (U63, U69)
POWER WINDOWS (A31)
POWER DOOR LOCKS (AU3)
POWER SEAT (AC3)
SEAT BELT WARNING BUZZER
POWER MIRRORS (D48)
VANITY MIRROR (D64)
WIPER/WASHER
PULSE WIPER/WASHER (CD4)
CRUISE CONTROL (K34)
BACK-UP LAMPS
TAIL LAMPS
LICENSE LAMP
TRAILER WIRING (UY7)

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