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 MANUALSJEEP2009GRAND CHEROKEE SRT-8REPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESAUDIO SYSTEM (RADIO) - ELECTRICAL DIAGNOSTICSDTC TROUBLESHOOTINGB140A-REAR LEFT AUDIO SPEAKER OUTPUT CIRCUIT HIGHDIAGNOSTIC TEST
2009 Jeep Grand Cherokee SRT-8
Diagnostic Test
2009 Jeep Grand Cherokee SRT-8SECTION 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 condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary.
- Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
- (X303) LEFT REAR SPEAKER (+) CIRCUIT SHORTED TO VOLTAGE
- Turn the ignition off.
- Disconnect the Radio harness connector.
- Disconnect the Left Rear Audio Speaker harness connector.
- Turn the ignition on.
- Measure for voltage on the (X303) Left Rear Speaker (+) circuit.
Is the voltage above 10.0 volts?
Yes
- Repair the (X303) Left Rear Speaker (+) circuit for a short to voltage.
- Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
No
- Go to step 3
- (X393) LEFT REAR SPEAKER (-) CIRCUIT SHORTED TO VOLTAGE
- Measure for voltage on the (X393) Left Rear Speaker (-) circuit.
Is the voltage above 10.0 volts?
Yes
- Repair the (X393) Left Rear Speaker (-) circuit for a short to voltage.
- Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
No
- Replace the Radio in accordance with the service information.
- Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
- Measure for voltage on the (X393) Left Rear 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.