P1695 - Remote Keyless Entry Circuit Low

Introduction:

The P1695 diagnostic trouble code (DTC) indicates a problem within the Remote Keyless Entry (RKE) system of a vehicle. Specifically, it signals that the control circuit voltage for the RKE system is lower than expected. This can prevent the key fob from working correctly, leading to frustration and inconvenience for the vehicle owner. Addressing this code promptly is crucial for restoring full RKE functionality and ensuring proper vehicle security.

Table: P1695 - Remote Keyless Entry Circuit Low

Detailed Explanations:

Definition: The P1695 code signifies that the voltage level in the Remote Keyless Entry (RKE) system's control circuit is lower than the expected value. This low voltage can disrupt the system's ability to properly receive and interpret signals transmitted from the key fob.

Symptoms: The symptoms of a P1695 code can range from minor inconveniences to significant security concerns. These include a key fob that doesn't work at all, intermittent operation where it works sometimes but not others, the inability to lock or unlock doors remotely, a malfunctioning panic button, random sounding of the vehicle alarm, and general malfunctions of the security system.

Possible Causes - Detailed:

• Weak/Dead Key Fob Battery: A weak or dead battery is the most frequent culprit. Key fobs need sufficient power to transmit a strong signal to the vehicle's receiver.

• Faulty Key Fob: Internal damage to the key fob, such as a broken circuit board or damaged components, can prevent it from transmitting the correct signal, even with a good battery.

• Damaged RKE Receiver: The RKE receiver is the component in the vehicle that receives the signal from the key fob. If this receiver is damaged or malfunctioning, it won't be able to properly process the signal.

• Wiring Harness Issues: Damage to the wiring harness, such as corrosion, shorts, or open circuits, can disrupt the flow of electricity to the RKE system. This is a common issue, especially in older vehicles or those exposed to harsh environments.

• Blown Fuse: A blown fuse in the RKE circuit will interrupt the power supply to the system, rendering it inoperable.

• Faulty BCM (Body Control Module): The BCM is a central computer that controls many of the vehicle's electronic systems, including the RKE. If the BCM is faulty, it can affect the RKE system's operation.

• Faulty RKE Module: Some vehicles have a dedicated RKE module that specifically handles the RKE functions. If this module fails, it can trigger the P1695 code.

• Low Vehicle Battery Voltage: A low vehicle battery voltage can affect the performance of various electronic systems, including the RKE. A weak battery may not provide enough power for the RKE system to function properly.

Diagnostic Steps:

• Visual Inspection: Begin by visually inspecting the key fob, RKE receiver, wiring harness, and fuses for any signs of damage or corrosion.

• Check Key Fob Battery: Replace the key fob battery with a new one to rule out a weak battery as the cause.

• Scan for Other DTCs: Use a scan tool to check for any other DTCs that may be related to the RKE system or the BCM.

• Check Fuses: Inspect the fuses related to the RKE system for any signs of being blown. Replace any blown fuses with the correct amperage rating.

• Check Wiring Harness: Carefully inspect the wiring harness for any signs of damage, corrosion, or loose connections. Use a multimeter to check for voltage drops and continuity in the wiring.

• Test RKE Receiver: Use a scan tool or multimeter to test the RKE receiver's functionality. Refer to the vehicle's service manual for the specific testing procedure.

• Test RKE Module: If the vehicle has a separate RKE module, test its functionality using a scan tool or multimeter.

• Test BCM: The BCM is a complex component, so testing it may require specialized equipment and knowledge. Consult a qualified technician for assistance.

• Check Vehicle Battery Voltage: Use a multimeter to check the vehicle's battery voltage. A fully charged battery should read around 12.6 volts.

Common Mistakes:

• Replacing the key fob without checking the battery: Always start with the simplest and most common cause, which is a weak key fob battery.

• Overlooking wiring issues: Wiring problems are a common cause of electrical issues. Thoroughly inspect the wiring harness for any signs of damage or corrosion.

• Failing to check fuses: Always check the fuses related to the RKE system before replacing any expensive components.

• Assuming the BCM is faulty without proper testing: The BCM is a complex and expensive component. Always perform thorough testing before assuming that it is the cause of the problem.

Related DTCs:

• B10D1, B10D2, B10D3, B10D4, B10D5, B10D6, B10D7, B10D8: These codes indicate various RKE circuit faults.

• P1690-P1699: These codes are a range of RKE system codes that can provide more specific information about the problem.

Tools Required:

• Multimeter: A multimeter is essential for checking voltage and continuity in the wiring.

• Scan Tool: A scan tool is needed to read DTCs and access BCM data.

• Wiring Diagram: A wiring diagram is crucial for tracing the RKE circuit and identifying potential problems.

• Fuse Puller: A fuse puller is a handy tool for safely removing fuses.

• Basic Hand Tools: Basic hand tools such as screwdrivers, pliers, and wire cutters will be needed for various tasks.

Severity:

The severity of the P1695 code is considered moderate. While the vehicle is still drivable, the loss of RKE functionality is inconvenient and can compromise security.

Repair Costs:

Repair costs can vary widely depending on the cause of the problem. A key fob battery replacement is inexpensive, while replacing the RKE receiver or BCM can be costly. Wiring repairs can range in price depending on the extent of the damage.

• Key fob battery: $5-$15
• Fuse replacement: $2-$10
• Wiring repair: $50-$500
• RKE receiver replacement: $100-$400
• BCM replacement: $300-$1000+

Labor costs will vary depending on the mechanic and the complexity of the repair.

Technical Details - Voltage Ranges:

Typical RKE circuit voltage should be around 12V when the system is active. The specific voltage range may vary depending on the vehicle manufacturer and model. Consult the service manual for the exact specifications. A reading significantly below 12V would indicate a circuit low condition.

Technical Details - Frequency:

RKE systems typically operate on radio frequencies ranging from 300 MHz to 450 MHz. The specific frequency used will vary depending on the vehicle manufacturer and region.

Security Implications:

A malfunctioning RKE system can compromise vehicle security. If the doors cannot be locked remotely, the vehicle is more vulnerable to theft. A malfunctioning alarm system can also be a nuisance.

Location of RKE Receiver:

The RKE receiver is typically located in the vehicle's interior, often near the rearview mirror, headliner, or under the dashboard. Refer to the vehicle's service manual for the exact location.

Frequently Asked Questions:

• What does the P1695 code mean? It means the voltage in the Remote Keyless Entry (RKE) circuit is lower than expected. This can prevent your key fob from working correctly.

• Can I fix the P1695 code myself? Potentially, yes. Start with simple checks like the key fob battery and fuses. If the problem persists, further diagnosis may require professional help.

• Is it safe to drive with the P1695 code? Yes, it is generally safe to drive, but you'll lose the convenience of remote locking/unlocking and alarm functions, potentially compromising security.

• How much will it cost to fix the P1695 code? The cost varies greatly depending on the cause, ranging from a few dollars for a battery to hundreds for a BCM replacement.

• Does a dead key fob battery cause the P1695 code? Yes, a weak or dead key fob battery is a common cause of the P1695 code. Replacing the battery is often the first and easiest solution to try.

Conclusion:

The P1695 code indicates a low voltage condition within the Remote Keyless Entry system, often resulting in a non-functional key fob. Start by checking the simplest solutions, such as the key fob battery and fuses, and proceed with more detailed diagnostics if necessary, consulting a qualified technician for complex issues.