Chevrolet Blazer V1500 1990 - ELECTRICAL COMPONENT LOCATOR 1989-90 ELECTRICAL COMPONENT LOCATIONS General Motors Corp. - Electrical Components

Chevrolet Blazer V1500 1990 - BUZZERS, RELAYS & TIMERS

Chevrolet Blazer V1500 1990 BUZZERS, RELAYS & TIMERS LOCATION

Component	Location
A/C-Heater Blower Relay	On evaporator case, on right side of firewall. See Fig. 1 .
Cold Advance Control Relay (6.2L)	On right side of firewall.
Downshift Relay (THM 400/3L80)
5.7L Component Location	On right side of firewall. See Fig. 2 .
5.7L Component View	On right side of firewall. See Fig. 3 .
Fuel Pump Relay
5.7L Component Location	On right side of firewall, on relay block. See Fig. 2 .
5.7L Component View	On right side of firewall, on relay block. See Fig. 3 .
Hazard Flasher Relay	On convenience center.
Horn Relay	Behind dash, left of steering column.
Multi-Function Warning Buzzer	On convenience center.
Power Door Lock Relay	On left side of steering column support.
Power Window Relay	Under left side of dash.
Turn Signal Flasher Relay	On fuse block.

Chevrolet Blazer V1500 1990 CIRCUIT PROTECTION DEVICES LOCATION

Component	Location
Fuse Block	Under left side of dash. See Fig. 2 .
Fusible Link
Auxiliary Battery Relay (Red)	At battery junction block, on right side of firewall.
Charging System (Red) (Gas)	In wiring harness to alternator.
Charging System (Rust) (Diesel)	In wiring harness to alternator.
Glow Plug Controller (Red)	At starter solenoid.
Lighting System (Red)	At battery junction block.
Starting System (Red)	At starter solenoid.

Chevrolet Blazer V1500 1990 CONTROL UNITS LOCATION

Component	Location
Cruise Control Module	Mounted on right side of steering column support.
Diesel Electronic Control (DEC) Module	Under right side of dash.
Electronic Control Module (ECM)
5.7L Component Location	Under right side of dash. See Fig. 2 .
5.7L Component View	Under right side of dash. See Fig. 3 .
Elect. Spark Control (ESC) Module	On top right side of engine. See Fig. 3 .
Fuel Pump Module (5.7L H/D)	Under left side of dash. See Fig. 2 .
Glow Plug Controller (6.2L)	On left rear of intake manifold.
Rear Wheel (ABS) Controller (1990 ONLY)	Below brake master cylinder.
Windshield Wiper Delay Module	On bottom of steering column.

Chevrolet Blazer V1500 1990 SENDING UNITS & SENSORS LOCATION

Component	Location
Cold Advance Control (CAC) & Fast Idle Solenoid Temp. Sensor (6.2L)	On rear of right cylinder head.
Coolant Temp. Sending Unit/Switch (5.7L)	On left front of driver's side cylinder head.
Coolant Temperature Sensor
5.7L Component Location	In right front corner of intake manifold. See Fig. 2 .
5.7L Component View	In right front corner of intake manifold. See Fig. 3 .
6.2L	On front of left cylinder head.
Engine Speed Sensor (6.2L)	On center rear of engine. See Fig. 4 .
Knock Sensor
5.7L Component Location	On lower right side of engine block, near starter. See Fig. 2 .
5.7L Component View	On lower right side of engine block, near starter. See Fig. 3 .
Manifold Absolute Pressure (MAP) Sensor
Diesel	On left side of firewall.
Gas
5.7L Component Location	On right side of intake manifold. See Fig. 2 .
5.7L Component View	On right side of intake manifold. See Fig. 3 .
Oil Pressure Sending Unit/Switch	On left rear of block. See Fig. 2 .
Oxygen (O2) Sensor	In left exhaust manifold. See Fig. 2 .
Throttle Position Sensor (TPS)
5.7L Component Location	On throttle body. See Fig. 2 .
5.7L Component View	On throttle body. See Fig. 3 .
Vehicle Speed Sensor (VSS) Buffer (See Point "F" in Graphic)	Mounted on speedometer. See Fig. 2 .
Vehicle Speed Sensor (VSS) PM Generator	Mounted on transmission tail shaft.
Water Sensor (Diesel)	On fuel filter assembly.

Chevrolet Blazer V1500 1990 MOTORS LOCATION

Component	Location
A/C-Heater Blower Motor	On right side of firewall, in engine compartment. See Fig. 1 .
Windshield Wiper Motor	On left side of firewall.

Chevrolet Blazer V1500 1990 SOLENOIDS & SOLENOID VALVES LOCATION

Component	Location
Canister Purge Solenoid Valve	In left front corner of engine compartment.
Cold Advance Control (CAC) Solenoid (6.2L)	On injection pump, under housing cover.
EGR Vacuum Solenoid (5.7L)	On top of engine, on bracket over left valve cover. See Fig. 3 .
EGR Solenoid (6.2L)
5.7L Component Location	On top of engine, on bracket over left valve cover. See Fig. 2 .
6.2L Diesel Engine	On top of engine, on bracket over left valve cover. See Fig. 4 .
Electric Air Control (EAC) Solenoid
5.7L Component Location	On right front of engine, near air pump. See Fig. 2 .
5.7L Component View	On right front of engine, near air pump. See Fig. 3 .
Exhaust Pressure Regulator (EPR) Solenoid (6.2L)	On top of engine, on bracket over left valve cover. See Fig. 4 .
Fast Idle Solenoid (6.2L)	On injection pump, under housing cover.
Idle Air Control (IAC) Valve
5.7L Component Location	On right side of throttle body. See Fig. 2 .
5.7L Component View	On right side of throttle body. See Fig. 3 .
Torque Conv. Clutch (TCC) Solenoid	In automatic transmission pan. See Fig. 2 .

Chevrolet Blazer V1500 1990 SWITCHES LOCATION

Component	Location
A/C Pressure Cycling Switch	On accumulator. See Fig. 1 .
Brake/Stoplight Switch	On brake pedal support bracket.
Brake Warning Switch	In hydraulic brake combination valve.
Clutch Switch (Cruise)	On clutch pedal bracket.
Fast/Cold Idle Switch (6.2L)	On right rear of engine.
Glow Plug Inhibit Switch	In water crossover near front of engine.
Restriction Switch (Diesel)	On fuel filter assembly.
TCC Governor Pressure Switch	In transmission.
Throttle Position Switch (6.2L)	On fuel injection pump.

Chevrolet Blazer V1500 1990 MISCELLANEOUS LOCATION

Component	Location
A/C-Heater Blower Motor
Noise Capacitor	In blower motor power feed line.
Resistor	On evaporator housing, next to blower motor. See Fig. 1 .
ALDL Diagnostic Connector	Under left side of dash. See Fig. 2 .
Convenience Center	Behind dash, right of steering column.
Digital Ratio Adapter (1990 ONLY)	Integral to instrument cluster.
Engine Block Heater (Opt.)	On left rear of engine, below exhaust manifold.
Fuel Heater/Water Detector (6.2L)	On firewall, in engine compartment.
Fuel Pump Prime/Test Connector	On right side of firewall. See Fig. 2 .
Vacuum Release Valve (Cruise) (1989 ONLY)	On bracket above brake pedal.
Vehicle Speed Sensor Buffer (VSS)	On speedometer assembly. See Fig. 2 .