2011 Ford Mustang Base, 2D Convertible, AutomaticFACTORY OEM SERVICE PROCEDURE

Smart Junction Box (SJB)

SMART JUNCTION BOX (SJB) DIAGNOSTIC TROUBLE CODE (DTC) LIST

DTC Description Action
B106B Tire Pressure Sensor Low Battery Refer to TIRES & WHEELS article.
B106D Tire Pressure Monitor System (TPMS) Initiators Not Configured Refer to TIRES & WHEELS article.
B106E Solid State Driver Disabled Due to Short Circuit Go to PINPOINT TEST A .
B106F Module Disabled Due to External Fault Go to PINPOINT TEST A .
B1138 Memory Full Refer to ANTI-THEFT SYSTEM - PASSIVE ANTI-THEFT SYSTEM (PATS) article.
B1139 Invalid Transmitter Identification Code Refer to HANDLES, LOCKS, LATCHES & KEYLESS ENTRY SYSTEM article.
B1302 Accessory Delay Relay Coil Circuit Failure Refer to WINDOWS & GLASS - GLASS, FRAMES & MECHANISMS article.
B1304 Accessory Delay Relay Coil Circuit Short To Battery Refer to WINDOWS & GLASS - GLASS, FRAMES & MECHANISMS article.
B1317 Battery Voltage High Go to PINPOINT TEST B .
B1318 Battery Voltage Low Go to PINPOINT TEST C .
B1320 Driver Door Ajar Circuit Open Refer to INTERIOR LIGHTING SYSTEM article.
B1328 Passenger Door Ajar Circuit Open Refer to INTERIOR LIGHTING SYSTEM article.
B1331 Decklid Ajar Rear Door Circuit Failure Refer to INTERIOR LIGHTING SYSTEM article.
B1342 ECU Is Faulted DIAGNOSE all other DTCs first. If no other DTCs are present, INSTALL a new SJB  . Refer to SMART JUNCTION BOX (SJB) in this service information. TEST the system for normal operation.
B1352 Ignition Key-In Circuit Failure Refer to INSTRUMENTATION SYSTEM, MESSAGE CENTER & WARNING CHIMES article.
B1472 Lamp Headlamp Input Circuit Short To Ground Refer to EXTERIOR LIGHTING SYSTEM article.
B1485 Brake Pedal Input Short To Battery Refer to EXTERIOR LIGHTING SYSTEM article.
B1510 Flash To Pass Switch Circuit Short To Ground Refer to EXTERIOR LIGHTING SYSTEM article.
B1520 Hood Switch Circuit Open Refer to ANTI-THEFT SYSTEM - ANTI-THEFT PERIMETER article.
B1578 Lamp Park Input Circuit Short To Ground Refer to EXTERIOR LIGHTING SYSTEM article.
B1688 Lamp Dome Input Circuit Short To Ground Refer to INTERIOR LIGHTING SYSTEM article.
B1696 Autolamp On Circuit Short To Ground Refer to EXTERIOR LIGHTING SYSTEM article.
B1791 Autolamp Sensor Input Circuit Open Refer to EXTERIOR LIGHTING SYSTEM article.
B1793 Autolamp Sensor Input Circuit Short to Ground Refer to EXTERIOR LIGHTING SYSTEM article.
B2008 Wipers On Signal Circuit Short to Ground Refer to EXTERIOR LIGHTING SYSTEM article.
B2044 Left Rear Stop Lamp Circuit Short To Ground Refer to EXTERIOR LIGHTING SYSTEM article.
B2046 Right Rear Stop Lamp Circuit Short To Ground Refer to EXTERIOR LIGHTING SYSTEM article.
B2048 Left Rear Turn Lamp Circuit Short To Ground Refer to EXTERIOR LIGHTING SYSTEM article.
B2050 Right Rear Turn Lamp Circuit Short To Ground Refer to EXTERIOR LIGHTING SYSTEM article.
B2071 Hazard Switch Signal Short To Ground Refer to EXTERIOR LIGHTING SYSTEM article.
B2100 Door Driver Key Cylinder Switch Failure Refer to ANTI-THEFT SYSTEM - ANTI-THEFT PERIMETER article.
B2212 Panel Dim Switch Out of Range Refer to INSTRUMENT CLUSTER ILLUMINATION & INSTRUMENT PANEL ILLUMINATION article.
B2254 Front Fog Lamp Switch Failure Refer to EXTERIOR LIGHTING SYSTEM article.
B2276 Less Than 2 Transmitters Programmed Refer to HANDLES, LOCKS, LATCHES & KEYLESS ENTRY SYSTEM article.
B2281 Right Turn Switch Short To Ground Refer to EXTERIOR LIGHTING SYSTEM article.
B2282 Left Turn Switch Short To Ground Refer to EXTERIOR LIGHTING SYSTEM article.
B2425 Remote Keyless Entry Out of Synchronization Refer to HANDLES, LOCKS, LATCHES & KEYLESS ENTRY SYSTEM article.
B2477 Module Configuration Failure Carry out Programmable Module Installation (PMI) on the SJB  . Refer to MODULE COMMUNICATIONS NETWORK - MODULE CONFIGURATION article.
B2479 Park Brake Switch Circuit Short To Ground Refer to INSTRUMENTATION SYSTEM, MESSAGE CENTER & WARNING CHIMES article.
B2498 Headlamp Switch Multiple Signals Input Active Refer to EXTERIOR LIGHTING SYSTEM article.
B2572 Brake Shift Interlock Output Circuit Failure Refer to AUTOMATIC TRANSMISSION EXTERNAL CONTROLS article.
B2844 Ignition Fault Refer to STEERING COLUMN SWITCHES article.
B2868 Left Front Tire Pressure Sensor Fault Refer to TIRES & WHEELS article.
B2869 Right Front Tire Pressure Sensor Fault Refer to TIRES & WHEELS article.
B2870 Right Rear Tire Pressure Sensor Fault Refer to TIRES & WHEELS article.
B2871 Left Rear Tire Pressure Sensor Fault Refer to TIRES & WHEELS article.
B2872 Tire Pressure Sensor Fault Refer to TIRES & WHEELS article.
B287A Tire Pressure System Fault Refer to TIRES & WHEELS article.
B2A20 Ignition Stuck in STAR Refer to STEERING COLUMN SWITCHES article.
B2A21 One or More Configuration Files Missing or Corrupt Carry out Programmable Module Installation (PMI) on the SJB  . Refer to MODULE COMMUNICATIONS NETWORK - MODULE CONFIGURATION article. CLEAR the DTCs. REPEAT the self-test. If DTC B2A21 is retrieved again, INSTALL a new SJB  . Refer to SMART JUNCTION BOX (SJB) in this service information. TEST the system for normal operation.
B2A22 Headlamp OFF Circuit Open Refer to EXTERIOR LIGHTING SYSTEM article.
B2A23 High Beam Input Circuit Short To Ground Refer to EXTERIOR LIGHTING SYSTEM article.
B2A24 Turn Signal Input Circuit Failure Refer to EXTERIOR LIGHTING SYSTEM article.
B2A25 Trim Panel Lock Switch Circuit Failure Refer to HANDLES, LOCKS, LATCHES & KEYLESS ENTRY SYSTEM article.
B2A27 Right Front Turn Lamp Circuit Open Refer to EXTERIOR LIGHTING SYSTEM article.
B2A28 Right Front Turn Lamp Circuit Short to Ground Refer to EXTERIOR LIGHTING SYSTEM article.
B2A29 Left Front Turn Lamp Circuit Open Refer to EXTERIOR LIGHTING SYSTEM article.
B2A2A Left Front Turn Lamp Circuit Short to Ground Refer to EXTERIOR LIGHTING SYSTEM article.
B2A2B Left Corner Lamp Output Circuit Short to Ground Refer to EXTERIOR LIGHTING SYSTEM article.
B2A2C Right Corner Lamp Output Circuit Short to Ground Refer to EXTERIOR LIGHTING SYSTEM article.
B2A2E Right Front Lamp Low Beam Circuit Open Refer to EXTERIOR LIGHTING SYSTEM article.
B2A2F Right Front Lamp Low Beam Circuit Short to Ground Refer to EXTERIOR LIGHTING SYSTEM article.
B2A30 Left Front Lamp Low Beam Circuit Open Refer to EXTERIOR LIGHTING SYSTEM article.
B2A31 Left Front Lamp Low Beam Circuit Short to Ground Refer to EXTERIOR LIGHTING SYSTEM article.
B2A32 LED Backlighting Output Circuit Open Refer to INSTRUMENT CLUSTER ILLUMINATION & INSTRUMENT PANEL ILLUMINATION article.
B2A33 LED Backlighting Output Circuit Short to Ground Refer to INSTRUMENT CLUSTER ILLUMINATION & INSTRUMENT PANEL ILLUMINATION article.
B2A35 Interior Lighting Output Circuit Open Refer to INTERIOR LIGHTING SYSTEM article.
B2A36 Interior Lighting Output Circuit Short to Ground Refer to INTERIOR LIGHTING SYSTEM article.
B2A38 Floor Lamp Output Circuit Short to Ground Refer to INTERIOR LIGHTING SYSTEM article.
B2A3A Puddle Lamp Output Circuit Short to Ground Refer to INTERIOR LIGHTING SYSTEM article.
P062F Internal Control Module EEPROM Error CLEAR the DTCs. REPEAT the self-test. If DTC P062F is retrieved again, INSTALL a new SJB  . Refer to SMART JUNCTION BOX (SJB) in this service information. TEST the system for normal operation.
C1125 Brake Fluid Level Sensor Input Circuit Failure Refer to INSTRUMENTATION SYSTEM, MESSAGE CENTER & WARNING CHIMES article.
C2780 ECU in Manufacturer Sub-State Refer to TIRES & WHEELS article.
U0155 Lost Communication With Instrument Panel Cluster (IC) Control Module Go to PINPOINT TEST D .
U2050 No Application Present Carry out Programmable Module Installation (PMI) on the SJB  . Refer to MODULE COMMUNICATIONS NETWORK - MODULE CONFIGURATION article. CLEAR the DTCs. REPEAT the self-test. If DTC U2050 is retrieved again, INSTALL a new SJB  . Refer to SMART JUNCTION BOX (SJB) in this service information. TEST the system for normal operation.
U2472 Unexpected Ignition State Refer to STEERING COLUMN SWITCHES article.
U2473 Unexpected Vehicle Speed (VSS)
NOTE: Sets during the self-test if vehicle speed exceeds 3 mph (5 kph) or vehicle speed cannot be determined by the SJB  .
VERIFY the speedometer operates correctly.If the speedometer does not operate correctly, Refer to INSTRUMENTATION SYSTEM, MESSAGE CENTER & WARNING CHIMES article.If the speedometer operates correctly, the self-test is carried out while the vehicle is moving. STOP the vehicle and REPEAT the self-test.
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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.

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