The Body Control Module (BCM) in your Infiniti G37 is a critical component responsible for managing various electrical functions. A malfunctioning BCM can lead to a range of issues, from minor inconveniences to major headaches. This guide focuses on the Infiniti G37 BCM, covering common symptoms of failure, the replacement process, and the crucial programming step. This information applies specifically to a 2003 G35 Coupe but may be similar for other years and models.
Identifying a Faulty Infiniti G37 BCM
A failing BCM often manifests in intermittent or persistent problems. Common symptoms include:
- No-Start Condition: The engine cranks but doesn’t start. This is often accompanied by the activation of the NATS (Nissan Anti-Theft System), indicated by a solid red security LED on the dashboard. Tapping on the ignition column might temporarily resolve the issue.
- Electrical Gremlins: Erratic behavior of lights, wipers, and other electrical components. Headlights or wipers might turn on uncontrollably with the key in the run position.
- Diagnostic Trouble Code (DTC) P1610: This code specifically indicates a “lock mode” issue, often related to the BCM.
Infiniti G37 BCM Replacement Procedure
Before embarking on the replacement process, disconnect the battery negative terminal. Confirming the BCM is the root cause is crucial. Refer to the service manual for diagnostic procedures: http://www.psedog.com/cars/fsm/g35/coupe/2003/bl.pdf. You can also pull codes yourself if present: https://g35driver.com/forums/5765264-post4.html.
- Locate the BCM: It’s situated on the driver’s side under the lower left kick panel.
- Remove Trim Pieces: Remove the necessary trim pieces by hand to access the BCM.
- Unbolt the BCM: Remove the 10mm bolts securing the BCM.
- Disconnect Plugs and Bracket: Carefully disconnect the plugs after loosening the BCM for easier access. Remove the securing bracket and any connected fuse panel components.
- Remove BCM from Bracket: Release the metal tabs holding the BCM within its plastic housing.
- Match Part Numbers: BCMs are not interchangeable across all models and years. Verify the part number on your existing BCM (e.g., 284B1 AM810) and ensure the replacement matches exactly.
- Install the New BCM: Install the new BCM by reversing the removal procedure.
Infiniti G37 BCM Programming
After installing the new BCM, the car likely won’t start due to the NATS. The new BCM must be programmed to recognize your car’s keys. Options for programming include:
- CONSULT-II: Nissan’s professional diagnostic tool.
- Dealership Programming: Often the most expensive option.
- Mobile Locksmith: A cost-effective solution; ensure the locksmith has the necessary equipment and expertise for Infiniti BCM programming. Confirm they can program Infiniti BCMs before hiring.
After programming, your Infiniti G37 should start and function normally. Replacing the BCM is a complex process; if unsure, seek professional assistance. A correctly functioning BCM is essential for the reliable operation of your Infiniti G37.
