The diagnostic trouble code (DTC) C0693, "Damper Control Relay Circuit High," indicates a problem within the electronic suspension system, specifically with the circuit controlling the damper control relay. This relay is crucial for adjusting the stiffness or damping characteristics of the vehicle's shock absorbers, contributing to ride comfort and handling performance. When the vehicle's computer detects a high voltage reading in the damper control relay circuit, it triggers the C0693 code, signaling a potential fault that needs investigation.
Understanding the C0693 code and its potential causes is essential for accurate diagnosis and repair, ensuring the electronic suspension system functions as intended. Ignoring this code can lead to diminished ride quality, compromised handling, and potentially accelerated wear on suspension components.
| Topic | Description | Relevant Information |
|---|---|---|
| Definition | Explanation of the C0693 code. | "Damper Control Relay Circuit High" indicates that the vehicle's computer (usually the Electronic Suspension Control Module or ESCM) has detected an abnormally high voltage reading in the circuit that controls the damper control relay. This relay is responsible for powering or switching the dampers (shock absorbers) to different settings (e.g., soft, normal, sport). A "High" voltage reading suggests an open circuit or a problem preventing the relay from being properly activated or deactivated. |
| Symptoms | Noticeable signs that accompany the C0693 code. | Stiff or harsh ride. Poor handling or stability. The service suspension system light illuminating. The suspension may be stuck in a particular setting (e.g., always stiff). In some cases, no noticeable symptoms may be present, especially if only one damper is affected. Error messages on the dashboard related to the suspension system. * Possible audible clicking or buzzing from the relay itself. |
| Common Causes | Potential reasons behind the C0693 code. | Open circuit in the damper control relay circuit: This could be a broken wire, a corroded connector, or a disconnected wire. Faulty damper control relay: The relay itself may be defective and not switching properly. Short to voltage in the damper control relay circuit: A wire in the circuit may be shorting to a power source, causing the high voltage reading. Faulty Electronic Suspension Control Module (ESCM): Although less common, the ESCM itself could be malfunctioning and providing an incorrect voltage reading or failing to properly control the relay. Corrosion or damage to connectors: Corrosion on the connectors leading to the relay or the ESCM can cause erratic voltage readings. Wiring harness damage: Rodent damage, chafing against other components, or general wear and tear can damage the wiring harness. |
| Diagnostic Steps | Steps involved in identifying the root cause of the C0693 code. | Visual Inspection: Carefully inspect the wiring harness and connectors associated with the damper control relay and the ESCM for any signs of damage, corrosion, or loose connections. Relay Testing: Test the damper control relay itself. This can be done using a multimeter to check for proper resistance and continuity. You can also try swapping the relay with a known good relay to see if the problem goes away. Circuit Testing: Use a multimeter to check the voltage and continuity of the wires in the damper control relay circuit. ESCM Diagnosis: If the wiring and relay appear to be in good condition, the ESCM may be the problem. Consult a repair manual or a qualified technician for specific ESCM diagnostic procedures. Scan Tool Data: Use a scan tool to monitor the voltage readings from the ESCM and the damper control relay in real-time. This can help identify intermittent problems or shorts to voltage. Check for Technical Service Bulletins (TSBs): Check if there are any TSBs related to the C0693 code for your specific vehicle make and model. TSBs often contain information about common problems and recommended solutions. |
| Possible Solutions | Recommended actions to resolve the C0693 code. | Repair or replace damaged wiring: If you find any damaged or corroded wiring, repair or replace it as needed. Replace the damper control relay: If the relay is faulty, replace it with a new one. Repair or replace corroded connectors: Clean or replace any corroded connectors. Replace the Electronic Suspension Control Module (ESCM): If the ESCM is found to be faulty, it will need to be replaced and possibly reprogrammed. Ensure proper grounding: Check and clean any grounding points related to the suspension system. Consult a qualified technician: If you are not comfortable performing these repairs yourself, it is best to consult a qualified technician. |
| Related Codes | Other DTCs that may appear alongside C0693. | C0691 - Damper Control Relay Circuit Low. C0692 - Damper Control Circuit Range/Performance. C0694 - Damper Control Circuit Open. Specific codes related to individual damper circuits (e.g., C0610 - Left Front Damper Actuator Circuit). Codes related to the ride height sensors. U codes (communication errors) related to the ESCM. |
| Affected Systems | Vehicle systems impacted by the C0693 code. | Electronic Suspension System (ESS). Ride Control System. Vehicle Stability Control (VSC) – may be indirectly affected. Anti-lock Braking System (ABS) – may be indirectly affected. * Driver Information System (displaying warning messages). |
| Component Location | Where to find the relevant components on the vehicle. | Damper Control Relay: The location of the damper control relay varies depending on the vehicle make and model. Common locations include the engine compartment fuse box, the interior fuse box (under the dashboard), or near the ESCM. Refer to the vehicle's repair manual for the exact location. Electronic Suspension Control Module (ESCM): The location of the ESCM also varies. It is often located under a seat, in the trunk, or behind the dashboard. Consult the repair manual. Dampers (Shock Absorbers): Located at each wheel of the vehicle. Wiring Harness: Runs throughout the vehicle, connecting the ESCM, relay, and dampers. |
Detailed Explanations
Definition:
The C0693 code, "Damper Control Relay Circuit High," signals that the vehicle's computer, usually the Electronic Suspension Control Module (ESCM), has detected a higher-than-expected voltage in the circuit controlling the damper control relay. This relay acts as a switch, directing power to the dampers (shock absorbers) to adjust their stiffness levels. A "high" voltage reading typically indicates an open circuit or a fault preventing the relay from being properly activated or deactivated, as the control module is seeing the full system voltage when it expects a lower voltage when the relay is supposed to be grounding the circuit.
Symptoms:
Several symptoms may accompany the C0693 code. You might experience a noticeably stiff or harsh ride, indicating that the dampers are not adjusting properly. Poor handling or stability can also be a sign, especially when cornering. The service suspension system light on the dashboard will likely illuminate, alerting you to a problem. The suspension may feel stuck in one setting, such as always feeling stiff. In some cases, no noticeable symptoms may be present, particularly if only one damper is affected. You might also see error messages related to the suspension system on the dashboard, or hear clicking or buzzing sounds from the relay itself.
Common Causes:
The C0693 code can stem from several issues. An open circuit in the damper control relay circuit is a common culprit, caused by broken wires, corroded connectors, or disconnected wires. A faulty damper control relay itself may be malfunctioning. A short to voltage in the damper control relay circuit can also cause the high voltage reading. A faulty Electronic Suspension Control Module (ESCM), while less common, could be providing incorrect voltage readings or failing to control the relay. Corrosion or damage to connectors leading to the relay or ESCM can disrupt the circuit. Finally, wiring harness damage from rodents, chafing, or general wear and tear can lead to circuit problems.
Diagnostic Steps:
Diagnosing the C0693 code requires a systematic approach. Start with a visual inspection of the wiring harness and connectors associated with the damper control relay and ESCM, looking for damage, corrosion, or loose connections. Next, test the damper control relay using a multimeter to check resistance and continuity, or by swapping it with a known good relay. Circuit testing with a multimeter can identify voltage and continuity issues in the wiring. If the wiring and relay seem fine, ESCM diagnosis might be necessary; consult a repair manual or technician. Use a scan tool to monitor voltage readings in real-time. Finally, check for Technical Service Bulletins (TSBs) related to the code for your vehicle.
Possible Solutions:
The appropriate solution depends on the identified cause. Repair or replace damaged wiring if any is found. Replace the damper control relay if it is faulty. Repair or replace corroded connectors to ensure proper connections. If the ESCM is faulty, it needs to be replaced and possibly reprogrammed. Ensure proper grounding by checking and cleaning grounding points. If you are not comfortable with these repairs, consult a qualified technician.
Related Codes:
The C0693 code can sometimes appear alongside other DTCs. These include: C0691 (Damper Control Relay Circuit Low), C0692 (Damper Control Circuit Range/Performance), C0694 (Damper Control Circuit Open), and codes related to individual damper circuits (e.g., C0610 - Left Front Damper Actuator Circuit). Codes related to ride height sensors or U codes (communication errors) involving the ESCM may also be present.
Affected Systems:
The C0693 code primarily affects the Electronic Suspension System (ESS) and the Ride Control System. It may indirectly affect the Vehicle Stability Control (VSC) and Anti-lock Braking System (ABS), as these systems rely on accurate suspension data. The Driver Information System will display warning messages related to the suspension issue.
Component Location:
The Damper Control Relay location varies by vehicle; check the engine compartment fuse box, interior fuse box, or near the ESCM. The Electronic Suspension Control Module (ESCM) location also varies, often found under a seat, in the trunk, or behind the dashboard. The Dampers (Shock Absorbers) are located at each wheel. The Wiring Harness runs throughout the vehicle, connecting these components.
Frequently Asked Questions
What does the C0693 code mean?
It means the vehicle's computer has detected a high voltage reading in the circuit controlling the damper control relay, which is responsible for adjusting the shock absorbers. This usually indicates an open circuit or short to voltage.
What are the most common symptoms of the C0693 code?
The most common symptoms include a stiff or harsh ride, poor handling, and the service suspension system light illuminating on the dashboard.
What are some potential causes of the C0693 code?
Common causes include a faulty damper control relay, damaged wiring, corroded connectors, or a malfunctioning Electronic Suspension Control Module (ESCM).
Can I fix the C0693 code myself?
Depending on your mechanical skills, you might be able to diagnose and fix the code yourself by inspecting wiring, testing the relay, or replacing connectors. However, more complex issues like a faulty ESCM might require professional assistance.
How much will it cost to fix the C0693 code?
The cost varies depending on the cause. Replacing a relay or repairing wiring might be relatively inexpensive, while replacing the ESCM can be significantly more costly.
Conclusion
The C0693 code, "Damper Control Relay Circuit High," indicates a problem within the electronic suspension system that requires prompt attention. By understanding the potential causes, diagnostic steps, and solutions outlined above, you can effectively troubleshoot and resolve the issue, restoring your vehicle's ride comfort and handling performance. If you are uncomfortable performing these repairs yourself, it is always best to consult a qualified technician for assistance.