B1624 – Lamp Keypad Output Open Circuit

The ODBII code B1624 indicates that there is an open circuit in the lamp keypad output, meaning the system is not detecting a proper electrical connection or signal from the lamp keypad.

The severity of ODBII code B1624 is generally considered moderate.

Common Causes For: B1623 Lamp Keypad Output Circuit Failure

• Faulty lamp keypad
• Damaged wiring or connectors
• Poor ground connection
• Short circuit in the circuit
• Failed body control module (BCM)
• Corroded terminals
• Open circuit in the wiring harness

Common misdiagnosis for B1624 Lamp Keypad Output Open Circuit

• Faulty instrument cluster
• Defective body control module (BCM)
• Wiring issues or shorts in the harness
• Malfunctioning keypad or switch
• Poor ground connections
• Incorrectly programmed or configured vehicle settings
• Faulty fuses or relay issues

Common Troubleshooting Steps

The OBD-II code B1624 indicates a problem with the lamp keypad output circuit, specifically that there is an open circuit. This code is often associated with issues in the vehicle’s body control module (BCM) or the wiring related to the lamp keypad. Here are some common troubleshooting steps to diagnose and resolve the issue:

• Check the Vehicle’s Manual: Refer to the vehicle’s service manual for specific information related to the B1624 code, including wiring diagrams and component locations.
• Visual Inspection:
• Inspect the wiring and connectors related to the lamp keypad for any signs of damage, corrosion, or loose connections.
• Look for frayed wires, broken connectors, or any other physical damage.
• Test the Lamp Keypad:
• If the vehicle is equipped with a lamp keypad, test its functionality. Ensure that all buttons are working correctly and that there are no stuck buttons.
• If possible, use a multimeter to check for continuity in the keypad circuit.
• Check for Short Circuits:
• Use a multimeter to check for any short circuits in the wiring harness associated with the lamp keypad. This includes checking for continuity between wires that should not be connected.
• Inspect the Body Control Module (BCM):
• The BCM is responsible for controlling various electrical functions in the vehicle, including the lamp keypad. Check for any fault codes in the BCM using a scan tool.
• If the BCM is suspected to be faulty, it may need to be tested or replaced.
• Check Fuses:
• Inspect the fuses related to the lighting and body control systems. A blown fuse could cause an open circuit condition.
• Perform a System Reset:
• Sometimes, clearing the code and resetting the system can resolve temporary issues. Use an OBD-II scanner to clear the code and see if it returns.
• Consult Technical Service Bulletins (TSBs):
• Check for any TSBs related to the B1624 code for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes.
• Professional Diagnosis:
• If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with your vehicle’s electrical systems. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1624 code.