The OBDII trouble code B1352 indicates a problem with the ignition key-in circuit, specifically when the ignition is off but the key remains in the ignition switch. This code is manufacturer-specific to Ford and Jaguar vehicles. Understanding this code and its potential causes can help you diagnose and resolve the issue.
Understanding the OBDII B1352 Code
The B1352 code, defined as “Ignition key-in – circuit failure,” is triggered when the Powertrain Control Module (PCM) detects a fault in the electrical circuits that remain active even after the ignition is turned off, as long as the key is still inserted. These circuits often power features like the door chime, which alerts the driver if the key is in the ignition while a door is open. While a safety feature, these chime circuits are known to be prone to malfunction, especially in Ford vehicles. The Ignition Switch RUN/ACC circuit supplies voltage to the Smart Junction Box (SJB) when the key is in the RUN/ACC position. The OBDII code B1352 sets when the signal from this Ignition Switch deviates from factory specifications.
Common Causes of the B1352 Code
Several issues can lead to a B1352 code. Here are some of the most common culprits:
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Faulty Ignition Switch: A malfunctioning ignition switch can disrupt the proper signaling to the PCM, leading to the B1352 code.
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Wiring Issues: Open, shorted, or corroded wiring in the ignition key-in circuit can disrupt the flow of electricity and trigger the code. Damaged connectors within this circuit can also cause the same problem.
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Smart Junction Box (SJB) Problems: The SJB plays a crucial role in power distribution and can contribute to the B1352 code if faulty.
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Door Chime Malfunction: A defective door chime itself can be the root cause, as it is a component within the monitored circuit.
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Door-Open Switch Issues: Faulty door-open switches can prevent the chime from activating correctly and lead to the B1352 code.
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Modifications: Aftermarket modifications intended to disable the door chime can sometimes inadvertently trigger this code.
Diagnosing and Resolving the B1352 Code
Troubleshooting the B1352 code involves a systematic approach:
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Visual Inspection: Begin by visually examining the wiring harness and connectors associated with the ignition key-in circuit. Look for any signs of damage, such as broken wires, bent pins, corrosion, or loose connections.
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Testing Components: Using a multimeter, test the ignition switch, door chime, and door-open switches for proper functionality. This will help pinpoint the faulty component.
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Checking for Modifications: Inquire about any previous modifications related to the door chime, as these might have inadvertently caused the issue.
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Control Module Check: While rare, a faulty PCM or Body Control Module (BCM) can also be responsible. However, exhaust all other possibilities before considering control module replacement.
Conclusion
The Obdii B1352 code points to a problem within the ignition key-in circuit, often related to the door chime functionality. While this issue might not immediately impact drivability, addressing it promptly prevents potential complications. By systematically inspecting the relevant components and circuits, you can effectively diagnose and resolve the underlying cause of the B1352 code. Remember to consult a qualified automotive technician for assistance if needed.
