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 MANUALSJEEP2009PATRIOT LIMITED, ED3, AWD, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTENTERTAINMENT SYSTEMSAUDIO SYSTEM (RADIO) - ELECTRICAL DIAGNOSTICSDTC TROUBLESHOOTINGB140A-REAR LEFT AUDIO SPEAKER OUTPUT CIRCUIT HIGHDIAGNOSTIC TEST
2009 Jeep Patriot Limited, ED3, AWD, Standard
Diagnostic Test
2009 Jeep Patriot Limited, ED3, AWD, StandardSECTION Diagnostic Test
- INTERMITTENT CONDITION
- Turn the ignition on, then off, and then on again.
- With the scan tool, read Radio DTCs.
Does the scan tool display active: B140A-REAR LEFT AUDIO SPEAKER OUTPUT CIRCUIT HIGH?
Yes
- Go to step 2
No
- The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
- Perform BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure
- CHECK FOR VOLTAGE ON THE (X303) SPEAKER (+) CIRCUIT
- Turn the ignition off.
- Disconnect the Radio C1 harness connector.
- Disconnect the Left Rear Speaker harness connector.
- Measure for voltage on the (X51) Speaker (+) circuit.
Is the voltage above 10.0 volts?
Yes
- Repair the (X51) Speaker (+) circuit for a short to voltage.
- Perform BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure
No
- Go to step 3
- CHECK FOR VOLTAGE ON THE (X393) SPEAKER (-) CIRCUIT
- Measure for voltage on the (X57) Speaker (-) circuit.
Is the voltage above 10.0 volts?
Yes
- Repair the (X57) Speaker (-) circuit for a short to voltage.
- Perform BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure
No
- Replace the radio in accordance with the Service Information.
- Perform BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure
- Measure for voltage on the (X57) Speaker (-) circuit.
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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.