MODEL IDENTIFICATION
Note. For the 1988-91 model years General Motors manufactured two (2) different truck models; the "R" & "V" models (similar to the older 1973-1987 model trucks), and the new "C" & "K" models. The new models use the old model designations except for payloads (Was: C10/15, Now: C1500).
Note. The Crew-Cab Bonus Cab (Single Rear Wheel) and Dually are only available (1988-91) in "R" & "V" models; and all Extended Cabs only in the new "C" & "K" design. From 1992 all trucks are new design "C" & "K" models.
Scheme 4
VIN LOCATION
The Vehicle Identification Number (VIN) is located on the left side of the dash panel at the base of the windshield. The VIN chart explains the code characters.
SERVICE PARTS IDENTIFICATION LABEL
Label is located inside glove box door and has the vehicle's VIN, wheelbase, paint information, and a list of all production options and special equipment.
VIN CODE ID EXPLANATION
Numbers preceding the explanations in the legend below refer to the sequence of characters as listed on VIN identification label. See VIN example below.
VIN Code ID Explanation. Scheme 5
SEVERE & NORMAL SERVICE DEFINITIONS
Note. Use the Severe Service schedule if the vehicle to be serviced is operated under ANY (one or more) of these conditions
Service is recommended at mileage intervals based on vehicle operation, emission classification, and Gross Vehicle Weight Rating (GVWR, VIN Position 4). Emission classification is identified by engine VIN code (except diesel-powered vehicles). Manufacturer's Schedules identify items to be serviced based on type of operation. Service schedules are based on the following primary operating conditions
Severe Service
- Short Trips (4 Miles Or Less)
- Freezing Temperatures
- Towing Or Heavily Loaded
- Severe Dust Conditions
- Hot Weather, Stop-And-Go Driving
- Extensive Idling Conditions (Taxi Or Delivery Type Service)
Normal Service
- No Severe Service Operating Conditions
Scheme 6
Scheme 7
Scheme 8
Scheme 9
SERVICE LABOR TIMES
Note. For 1990 and newer vehicles, labor times are provided, where available, within appropriate SERVICE INTERVAL table in SCHEDULED SERVICES article.
WHEEL & TIRE SPECIFICATIONS
Wheel and tire information can be found on the decal attached to rear of driver's door.
TORQUE SPECIFICATIONS
| Application | Ft. lbs. (N.m) |
|---|---|
| R10/15 (5 bolt) | 88 (120) |
| V10/15 (6 bolt) | 80 (108) |
| R-V 20/25 (8 bolt) | 103 (140) |
| R-V 30/35 (8 bolt Single Rear Wheels) | 103 (140) |
| R-V 30/35 (8 bolt Dual Rear Wheels) | 125 (170) |
TORQUE SPECIFICATIONS
BATTERY SPECIFICATIONS
| CAUTION | When battery is disconnected, vehicles equipped with computers may lose memory data. When battery power is restored, driveability problems may exist on some vehicles. These vehicles may require a relearn procedure. See COMPUTER RELEARN PROCEDURES article in the GENERAL INFORMATION section. |
ANTI-LOCK BRAKE SYSTEM (REAR WHEEL)
The anti-lock brake system contains electronic equipment that can be susceptible to interference caused by improperly installed or high output radio transmitting equipment. Since this interference could cause the possible loss of the anti-lock braking capability, such equipment should be installed by qualified professionals.
On models equipped with anti-lock brake systems, ALWAYS observe the following cautions
- DO NOT attempt to bleed hydraulic system without first referring to the appropriate ANTI-LOCK BRAKE SYSTEM article in the BRAKES Section.
- DO NOT mix tire sizes. As long as tires remain close to the original diameter, increasing the width is acceptable. Rolling diameter must be identical for all 4 tires. Some manufacturers recommend tires of the same brand, style and type. Failure to follow this precaution may cause inaccurate wheel speed readings.
- Use ONLY recommended brake fluids. DO NOT use silicone brake fluids in an ABS-equipped vehicle.
REPLACING BLOWN FUSES
| CAUTION | Before replacing a blown fuse, remove ignition key, turn off all lights and accessories to avoid damaging the electrical system. Be sure to use fuse with the correct indicated amperage rating. The use of an incorrect amperage rating fuse may result in a dangerous electrical system overload. |
BATTERY WARNING
| WARNING | When battery is disconnected, vehicles equipped with computers may lose memory data. When battery power is restored, driveability problems may exist on some vehicles. These vehicles may require a relearn procedure. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION section. |
BRAKE PAD WEAR INDICATOR
Indicator will cause a squealing or scraping noise, warning that brake pads need replacement.
CATALYTIC CONVERTER
| CAUTION | To prevent catalytic converter overheating, DO NOT allow engine to idle for more than 20 minutes. |
DIESEL FUEL ANTI-FUNGAL ADDITIVES
| CAUTION | If fuel contamination due to fungi or other microorganisms is suspected a fuel additive with a biocide may be used. Follow the manufacturers dosage as recommended on product label. Use biocides ONLY when necessary, excessive use can may cause other fuel system problems. |
DIESEL FUEL CONTAMINATION
| WARNING | Diesel fuel system may be contaminated with fungi or other microorganisms. Keep contaminated fuel away from open skin cuts or sores to prevent skin irritation or infection. |
DIESEL FUEL REQUIREMENTS
| CAUTION | All diesel engines are to use Diesel Fuel #2 when the outside temperature is above 20°F (-7°C). In temperatures that are below 20°F (-7°C) use Diesel Fuel #1, this will reduce the chance of the fuel thickening and forming wax. |
Note. A Diesel Fuel #1 & #2 combination (Blended Fuel) may be used, and is recommended for mild winter driving.
ELECTROSTATIC DISCHARGE SENSITIVE (ESD) PARTS
| WARNING | Many solid state electrical components can be damaged by static electricity (ESD). Some will display a warning label, but many will not. Discharge personal static electricity by touching a metal ground point on the vehicle prior to servicing any ESD sensitive component. |
FUEL SYSTEM SERVICE
| WARNING | Relieve fuel system pressure prior to servicing any fuel system component (fuel injection models). |
HALOGEN BULBS
Halogen bulbs contain pressurized gas which may explode if overheated. DO NOT touch glass portion of bulb with bare hands. Eye protection should be worn when handling or working around halogen bulbs.
RADIATOR FAN
Keep hands away from radiator fan. Fan is controlled by a thermostatic switch which may come on or run for up to 15 minutes even after engine is turned off.
WARRANTY INFORMATION
| CAUTION | Always refer to customer's copy of warranty information for specific model application and/or coverage limitations. |
BUMPER-TO-BUMPER PLUS COVERAGE LIMITED WARRANTY
Entire vehicle (except battery) is covered for 3 years or 50,000 miles, whichever occurs first. Covered by this warranty are any repairs to vehicle components which have proven defective in material and workmanship under normal use (tires excluded). Warranty repairs (parts and labor) will be made by the Dealer at no charge using new or remanufactured parts. This warranty is subject to a 100 deductible for each repair visit after the first year or 12,000 miles, whichever occurs first.
BATTERY COVERAGE
Covers replacement cost of battery for 3 years or 50,000 miles (36,000 miles on 1992 models), whichever occurs first. A prorated charge applies after first 12 months or 12,000 miles, whichever occurs first.
CORROSION COVERAGE
Covers any body sheet metal panel that is perforated due to corrosion. Coverage is for 6 years or 100,000 miles, whichever occurs first.
EMISSIONS "DEFECT" & "PERFORMANCE" WARRANTIES (EXCEPT CALIFORNIA)
Defect Warranty ensures vehicle meets applicable EPA regulations and that emission control system is free from defects in materials and workmanship. Coverage is for 5 years or 50,000 miles, whichever occurs first.
Performance Warranty covers all costs of repairing or adjusting any components or parts as needed in order for the vehicle to pass a federally-required state or local emissions test. Other emission control parts related to these components are covered by the Performance Warranty, where applicable. If another part fails due to the failure of one of these components, both parts are covered. See customer's copy of warranty information for specific items covered.
EMISSION "PERFORMANCE" WARRANTY (CALIFORNIA)
If vehicle fails a Smog Check inspection, all necessary repairs and adjustments will be made by manufacturer to ensure vehicle passes inspection. Coverage is for 3 years or 50,000 miles, whichever occurs first.
LIGHT-DUTY EMISSION "DEFECTS" WARRANTY (CALIFORNIA)
If any emission-related part on the vehicle is defective, the part will be repaired or replaced by manufacturer. Coverage is for 3 years or 50,000 miles, whichever occurs first.
Some emission-related parts are covered for 7 years or 70,000 miles, whichever occurs first, and will be repaired or replaced by manufacturer if found to be defective in material or workmanship. See customer's copy of warranty information for specific items covered.
HEAVY-DUTY EMISSION CONTROL SYSTEMS (GASOLINE ENGINES)
Warranty coverage is 5 years or 50,000 miles, whichever occurs first.
HEAVY-DUTY EMISSION CONTROL SYSTEMS (DIESEL ENGINES)
Warranty coverage is 5 years or 100,000 miles, whichever occurs first.
CONVENIENCE CENTER LOCATION
The convenience center is located on a bracket which is bolted to the brake pedal bracket to the right of the steering column. It contains the Horn Relay, Hazard Flasher and Audio Alarm Relay.
Scheme 10
FUSE PANEL LOCATION
The fuse block is located behind a cover in the dash to the left of the steering column.
Scheme 11
Fuse & Circuit Breaker Identification
- 1 - HORN/DIM 20 Amp (Yellow) Horn, Cigarette Lighter, Dome & Cargo Lights, Clock
- 2 - T/L CTSY 20 Amp (Yellow) Taillights/Courtesy Lights, Parking Lights, Roof Marker
- 3 - ECM B 10 Amp (Red) (Gasoline Models) Electronic Control Module Memory, TBI Fuel Pump, TBI Auxiliary Tank Selector Switch
- 4 - IGN 20 Amp (Yellow) Cruise Control, Engine Overspeed Light (Export), Carbureted & Diesel Auxiliary Fuel Tank Selector Switch
- 5 - GAUGE/IDLE 20 Amp (Yellow) Instrument Cluster, Seat Belt & Lights On Buzzer, TBI Torque Converter Clutch Solenoid, Auxiliary Coolant Fan Relay, TBI Fuel Pump Priming Module, Transmission Kickdown Relay and Solenoid (M40), A.I.R. Divert Solenoid (Carbureted Models), Water in Fuel Sensor & Fuel Heater (Diesel)
- 6 - TURN-B/U 15 Amp (Blue) Directional Signals, Back-Up Lights
- 7 - ECM I 10 Amp (Red) (Gasoline Models) ECM-Ignition Feed (Ing. 1), Vehicle Speed Sensor, TBI Spark Control Module, TBI Fuel Injectors, TBI A.I.R. Divert Solenoid, TBI EGR or E.V.R.V. Solenoid
- 8 - INST LPS 5 Amp Instrument Panel Lights, Lights On Reminder Module
- 9 - AUX HTR A/C 25 Amp Not Used
- 10 - HTR A/C 20 Amp (Yellow) Heater & Air Conditioning
- 11 - PWR WDO 30 Amp (Circuit Breaker) Power Windows
- 12 - Not Used (1988-90) DRL 15 Amp (Blue) (1991) Daytime Running Lights (Canada)
- 13 - PWR ACC 30 Amp (Circuit Breaker) Power Door Locks
- 14 - STOP-HAZ 15 Amp (Blue) Hazard Flasher, Seat Belt & Headlight On Buzzer, Stop Lights
- 15 - RADIO 15 Amp (Blue) Radio, Auxiliary Battery Relay, 4WD Indicator Light, Automatic Transmission, Converter Clutch Solenoid (Diesel)
- 16 - WIPER 25 Amp Windshield Wipers, Washer Pump
- 17 - CRANK 3 Amp (Violet) (Gasoline Models) Electronic Control Module, Crank Circuit
- 18 - CHOKE 20 Amp (Yellow) (1988-90) Not Used (1991) Carburetor Choke Heater