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 1756 (CELLULAR SYSTEM, ENTERTAINMENT SYSTEM, AND NAVIGATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESRADIO POOR RECEPTIONANTENNA COAXIAL CABLE TESTINGNOTES
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Antenna Coaxial Cable Testing: Notes
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Notes
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
Use the appropriate chart and diagram to test the antenna coaxial cable resistances for the antenna system on the vehicle. Refer to the table when testing the antenna and/or lead-in cable.
| Callout | Component Name |
|---|---|
| 1 | Negative Battery Cable |
| 2 | Coaxial Cable Conductor - Radio End |
| 3 | Coaxial Cable Metal Outer Shield - Radio End |
| 4 | Coaxial Cable Metal Outer Shield - Antenna End |
| 5 | Coaxial Cable Conductor - Antenna End |
| 6 | Antenna Base |
| 7 | Antenna Mast |
| 8 | Antenna Coaxial Cable |
Radio Poor Reception
| Ohmmeter Probes At Points | Resistance Measured In Ohms |
|---|---|
| 1 and 3 | Less than 0.2 |
| 1 and 4 | Less than 0.2 |
| 1 and 6 | Less than 0.2 |
| 1 and 2 | Infinite |
| 1 and 5 | Infinite |
| 1 and 7 | Infinite |
| 2 and 3 | Infinite |
| 2 and 4 | Infinite |
| 2 and 6 | Infinite |
| 3 and 4 | Less than 0.2 |
| 3 and 6 | Less than 0.2 |
| 3 and 5 | Infinite |
| 3 and 7 | Infinite |
IMPORTANT:
Always zero out the DMM before taking a resistance measurement in order to ensure an accurate reading.
- Measure the resistance from the coax center conductor to antenna mast, ohmmeter probes at points 2 and 7.
- Total resistance from end to end of center conductor, ohmmeter probes at points 2 and 5:
- RG-58/RG-59 type cable-Less than 0.20 ohms per foot
- RG-62/RG-62M type cable-Less than 3.5 ohms per foot
- When checking the resistance, cautiously wiggle the lead-in tip and cable. Refer to Testing for Intermittent Conditions and Poor Connections .
- Replace the antenna and/or lead-in cable when the above readings are not obtained. Refer to Fixed Antenna Replacement or Antenna Cable Replacement for service procedure.
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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.