Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1974 (COMPONENT CONNECTOR END VIEWS - (4 OF 5))
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Section 1974 (Component Connector End Views - (4 Of 5))
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Section 1974 (Component Connector End Views - (4 Of 5))
WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
- High Pressure Fuel Pump (LCS)
- High Voltage Circuit Impact Detection Sensor - Front (HP5)
- High Voltage Circuit Impact Detection Sensor - Rear (HP5)
- Hill Hold Brake Delay Valve (HP7)
- Hood Ajar Switch (AP3/HP5/HP7)
- Horn - Left
- Horn - Right
- Horn Switch X1
- Horn Switch X2
- HVAC Control Module X1 (C67)
- HVAC Control Module X1 (C68)
- HVAC Control Module X2
- HVAC Control Module X3 (C67)
- HVAC Control Module X3 (C68)
- Ignition Coil 1 (LAT/LE5/LE9)
- Ignition Coil 1 (LCS)
- Ignition Coil 1 (LY7)
- Ignition Coil 2 (LAT/LE5/LE9)
- Ignition Coil 2 (LCS)
- Ignition Coil 2 (LY7)
- Ignition Coil 3 (LAT/LE5/LE9)
- Ignition Coil 3 (LCS)
- Ignition Coil 3 (LY7)
- Ignition Coil 4 (LAT/LE5/LE9)
- Ignition Coil 4 (LCS)
- Ignition Coil 4 (LY7)
- Ignition Coil 5 (LCS)
- Ignition Coil 5 (LY7)
- Ignition Coil 6 (LCS)
- Ignition Coil 6 (LY7)
- Ignition Control Module (ICM) (LZ4)
- Ignition Lock Cylinder Control Solenoid (LAT/LE5/LE9)
- Ignition Switch (LAT/LE5/LE9)
- Ignition Switch (LCS/LY7/LZ4)
- Ignition Switch Lamp (LCS/LY7/LZ4)
- Inflatable Restraint Front End Sensor - Left
- Inflatable Restraint Front End Sensor - Right
- Inflatable Restraint I/P Module
- Inflatable Restraint Passenger Presence System (PPS) Module (-APL)
- Inflatable Restraint Roof Rail Module - Left
- Inflatable Restraint Roof Rail Module - Right
- Inflatable Restraint Sensing and Diagnostic Module (SDM) (with APL/ATY)
- Inflatable Restraint Sensing and Diagnostic Module (SDM) (without APL/ATY)
- Inflatable Restraint Side Impact Module - Left
- Inflatable Restraint Side Impact Module - Right (-APL)
- Inflatable Restraint Side Impact Sensor (SIS) - Left
- Inflatable Restraint Side Impact Sensor (SIS) - Right
- Inflatable Restraint Steering Wheel Module X1
- Inflatable Restraint Steering Wheel Module X2
- Inflatable Restraint Steering Wheel Module Coil X1
- Inflatable Restraint Steering Wheel Module Coil X2
- Inflatable Restraint Steering Wheel Module Coil X3
- Inflatable Restraint Vehicle Rollover Sensor
- Inside Rearview Mirror (ISRVM)
- Instrument Panel Cluster (IPC)
- I/P Compartment Lamp
- I/P Compartment Lamp Switch
- Knock Sensor (KS) (LAT/LE5/LE9)
- Knock Sensor 1 (LCS/LZ4)
- Knock Sensor 1 (LY7)
- Knock Sensor 2 (LCS/LZ4)
- Knock Sensor 2 (LY7)
- License Lamp - Left
- License Lamp - Right
- Liftgate Latch Assembly
- Liftgate Release Switch
- Manifold Absolute Pressure (MAP) Sensor (without LCS)
- Marker Lamp - Left Front
- Marker Lamp - Left Rear
- Marker Lamp - Right Front
- Marker Lamp - Right Rear
- Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor (LAT/LE5/LE9)
- Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor (LCS/LY7/LZ4)
- Mode Actuator
- Multifunction Switch - I/P
- Onstar Button Assembly (UE1)
- Outside Rearview Mirror - Driver (DG7)
- Outside Rearview Mirror - Passenger (DG7)
- Outside Rearview Mirror Switch (DG7)
- Park Brake Switch
- Park/Neutral Position (PNP) Switch (ME7)
- Park/Neutral Position (PNP) Switch (MN5)
- Park/Turn Signal Lamp - Left Front
- Park/Turn Signal Lamp - Right Front
- Pressure Control (PC) Solenoid Valve
- Radio Antenna
- Radio X1
- Radio X2
- Radio X4 (U3U)
- Rear Compartment Courtesy Lamp - Left
- Rear Compartment Courtesy Lamp - Right
- Rear Differential Clutch Control Module X1 (AWD)
- Rear Differential Clutch Control Module X2 (AWD)
- Rear Vision Camera
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.