B1698 — Mirror Driver/Passenger Switch Circuit Short To Ground #

Note: The exact wording of this code may vary depending on the vehicle manufacturer (OEM). Below are some known label variations:

• B1698 — Mirror Switch Circuit Short To Ground (Generic, Ford, Chrysler)
• B1698 — Driver/Passenger Mirror Adjust Switch Circuit Low (GM)
• B1698 — Mirror Control Switch Signal Shorted (Mazda)

Summary of DTC B1698 #

The B1698 trouble code indicates that the vehicle’s onboard diagnostics (OBD-II) system has detected a short to ground condition in the mirror switch circuit—specifically, in the wiring or switch controlling the driver or passenger side mirrors. This means that the electrical pathway is unintentionally connecting to the vehicle’s chassis ground, which can disrupt normal mirror adjustment functions. The code is most often associated with electrically adjustable side mirrors and is typically monitored by the Body Control Module (BCM), which oversees various body-related functions. Although this code rarely affects drivability, it can impact comfort and mirror safety features, especially for multi-driver vehicles or those using memory seats. Addressing B1698 promptly can prevent further electrical issues and restore full mirror operation.

Frequent Symptoms for Code B1698 #

When the B1698 code appears, symptoms are generally related to mirror operation and convenience features. Some may be subtle and others quite obvious. Be alert for the following signs:

• Side mirrors (driver or passenger) do not respond to adjustment commands.
• Mirror switch feels unusually warm or is inoperative.
• Mirror memory settings fail to recall positions.
• Intermittent or partial mirror movement.
• Blown fuse for the mirror or door control circuit.
• Warning light or message on the dashboard (depending on the vehicle model).

Probable Causes for Code B1698 #

The B1698 code usually points to an electrical issue in the mirror switch circuit. Causes are ranked below from most to least common, based on real-world repairs and OEM bulletins:

1. Damaged or chafed wiring in the mirror switch harness, often caused by repeated door movement.
2. Faulty mirror switch—the internal contacts may be shorted to ground due to wear or moisture intrusion.
3. Corroded or loose connectors at the switch or mirror motor, leading to unintended grounding.
4. Failed Body Control Module (BCM) or related relay (less common, but possible on older/high-mileage vehicles).
5. Incorrect aftermarket installations (such as alarm, remote start, or custom mirrors) that tap into the mirror circuit.

Step-by-Step Diagnosis for Code B1698 #

Diagnosing B1698 requires a systematic approach to pinpoint the root cause. Follow these steps for a reliable diagnosis:

• Check for other related codes that may provide context (especially BCM or mirror-related codes).
• Visually inspect the mirror switch and harness for signs of damage, pinching, or exposed wires.
• Test the mirror switch operation (with the ignition on) and observe for mirror response or abnormal switch heating.
• Remove the door panel (if needed) to access and inspect the mirror switch connector and wiring for corrosion or shorts.
• Using a digital multimeter, test for continuity to ground on the affected circuit—there should be none unless the switch is activated.
• If wiring and switch check out, use a scan tool to monitor BCM inputs/outputs for the mirror switch circuit.
• Consult OEM wiring diagrams to verify correct pinouts and possible TSBs (Technical Service Bulletins) for your model.

Possible Repairs for Code B1698 #

Repairs will depend on the diagnostic findings. Address the root cause to avoid recurring issues. Typical repairs include:

• Repair or replace damaged wiring in the mirror switch harness, particularly where it passes through the door hinge area.
• Replace the mirror switch if found to be shorted internally.
• Clean or replace corroded connectors at the switch or mirror assembly.
• Repair or replace the BCM if internal faults or failed outputs are confirmed.
• Correct any aftermarket wiring that may have caused the short (reroute or properly isolate connections).

Can You Drive With Code B1698? #

Yes, you can generally continue driving with code B1698, as it rarely affects vehicle safety or core functions. However, you may lose the ability to adjust side mirrors electronically, which can compromise visibility and driver comfort—especially if multiple people use the vehicle. Prompt repair is recommended to restore full convenience and avoid additional electrical complications.

Vehicles Most Commonly Affected by Code B1698 #

While this code can appear in any modern vehicle with power mirrors, it is most frequently reported in the following models due to common wiring routing and switch design:

• Ford F-Series (especially 2010–2017)
• Chrysler 300, Dodge Charger (2005–2012)
• Chevrolet Silverado, GMC Sierra (2007–2014)
• Mazda 6, Mazda CX-5 (2012–2018)
• Jeep Grand Cherokee (2011–2017)

Common Mistakes & Best Practices for Code B1698 #

Quick fixes or guesswork can lead to wasted time and money. Avoid these common pitfalls, and follow industry best practices:

• Replacing the mirror switch without first inspecting and testing the wiring, which is often the real culprit.
• Overlooking corroded or loose connectors, especially in high-humidity or older vehicles.
• Ignoring aftermarket modifications that may have disturbed factory wiring.
• Failing to consult OEM wiring diagrams—pinouts can differ between models and years.
• Assuming the BCM is faulty before ruling out simpler causes like wiring or switch issues.

Quick FAQ for B1698 #

Still have questions? Here are quick answers to common concerns:

• Q: Can B1698 cause my mirrors to move on their own?
  A: While rare, if the circuit is shorted, you may see random or erratic mirror movements—usually, though, mirrors just stop responding.
• Q: Will fixing B1698 require programming or dealer tools?
  A: In most cases, no. Repairs typically involve wiring or switch replacement. BCM replacement may require dealer programming, but that’s uncommon for this code.