B1613 — Wiper Rear Mode Select Switch Circuit Short To Battery #

The description for this DTC (Diagnostic Trouble Code) may vary depending on the vehicle manufacturer. Always refer to OEM (Original Equipment Manufacturer) documentation for your specific model.

• Ford: Wiper Rear Mode Select Switch Circuit Short To Battery
• Chrysler: Rear Wiper Mode Switch Circuit High
• Toyota: Rear Wiper Selector Switch Signal High

Summary of DTC B1613 #

DTC B1613 signals an issue within the rear wiper mode select switch circuit, specifically that the circuit is experiencing a short to battery condition. This means the circuit is seeing battery voltage when it shouldn’t, typically due to a wiring fault or switch malfunction. The rear wiper mode select switch allows the driver to choose operational modes (such as intermittent, continuous, or off) for the rear wiper. When the circuit is shorted to battery, the switch or its wiring is bypassed or constantly powered, potentially causing erratic rear wiper behavior. This code is most often detected by the Body Control Module (BCM) or similar controller, which monitors electrical circuits for faults. Prompt attention is advised to avoid further electrical complications or inconvenience.

Common Symptoms for DTC B1613 #

This fault can manifest in several ways, often impacting rear wiper operation. Drivers may notice the rear wiper acting unpredictably, operating continuously, or failing to respond to switch commands. Sometimes, there will be other minor electrical symptoms if the short affects related circuits. Here are typical signs:

• Rear wiper operates constantly, regardless of switch position
• Rear wiper does not respond to command changes (e.g., won’t turn off)
• Intermittent or erratic rear wiper behavior
• Warning lights or messages on the dashboard (in some models)
• Possible blown fuse related to rear wiper circuit

Probable Causes for DTC B1613 #

Several potential culprits can trigger the B1613 code, but some are more common than others. The issue almost always relates to some form of electrical short or faulty switch, but could also involve wiring harness problems or issues within the Body Control Module. Diagnosing the exact cause involves a systematic check of each component and connection. The most frequent origins are:

1. Shorted wiring harness to the rear wiper mode select switch (insulation damage, pinched wire, or corrosion)
2. Faulty rear wiper mode select switch (internally shorted contacts)
3. Connector corrosion or water intrusion at the rear wiper switch or BCM
4. Incorrect or failed BCM (less common but possible)
5. Aftermarket electrical modifications interfering with the rear wiper circuit

Step-by-Step Diagnosis for DTC B1613 #

Diagnosing B1613 requires a methodical approach to pinpoint the fault without causing further damage. Use a quality digital multimeter and, when available, a scan tool with live data capability. Always follow safety protocols and disconnect the battery if you’re inspecting the wiring.

1. Verify the DTC; clear it and see if it returns with the wiper switch in different positions.
2. Inspect the rear wiper mode select switch for obvious signs of damage or moisture.
3. Check all wiring and connectors between the switch, BCM, and wiper motor for abrasions, pinches, or corrosion.
4. With the ignition on (engine off), use a multimeter to check for unintended 12V at the switch output wire.
5. If present, disconnect the switch and BCM connectors one at a time to isolate where the short is coming from.
6. Test the rear wiper mode select switch for continuity and shorts across terminals according to OEM diagrams.
7. If all else checks out, suspect a BCM internal fault (rare; confirm with a known good module if possible).

Possible Repairs for DTC B1613 #

Once you’ve identified the root cause, the repair should directly address the specific issue found. It’s crucial to use OEM-approved parts and procedures to ensure long-term reliability and safety. Here’s what repairs might involve, depending on the diagnosis:

• Repair or replace damaged wiring harness (repair insulation, solder and heat-shrink, or replace harness section)
• Replace the rear wiper mode select switch if it’s internally shorted or otherwise malfunctioning
• Clean and secure all connectors (remove corrosion, apply dielectric grease, ensure tight fit)
• Replace the BCM (only if confirmed faulty after excluding all other causes)
• Remove or correct any aftermarket modifications interfering with the wiper circuit

Is It Safe to Drive with Code B1613? #

Your ability to drive is generally not compromised by DTC B1613, but your rear visibility may be. If the rear wiper is stuck on, off, or acting erratically, your rear window’s clarity—especially in rain or snow—could be affected. For safety, avoid driving in conditions where rearward visibility is critical until repairs are made. If the wiper motor is running continuously, it could also wear out prematurely.

Vehicles Most Commonly Affected by DTC B1613 #

While B1613 can occur on a range of vehicles equipped with rear wipers and electronically controlled switches, it’s most frequently reported on models where the wiper switch wiring is routed through high-wear areas (such as tailgates or hatchbacks). Examples include:

• Ford Escape / Kuga (various years)
• Chrysler Town & Country / Dodge Grand Caravan
• Toyota RAV4 / Highlander
• Jeep Grand Cherokee (models with rear wiper switch on liftgate)
• Honda CR-V (older generations)

Common Mistakes and Best Practices for DTC B1613 #

A rushed approach can lead to repeated failures or unnecessary part replacements. Always follow a logical diagnostic path and avoid short-cuts.

• Do not replace the rear wiper motor without testing the switch and wiring first.
• Always inspect for water intrusion or corrosion, especially in hatch or tailgate areas.
• Do not ignore the possibility of previous repair or aftermarket alarm/remote start system tampering with harnesses.
• Use OEM wiring diagrams to trace circuits accurately—assumptions often lead to misdiagnosis.
• After repairs, always clear DTCs and perform a functional check of all wiper modes.

Quick FAQ for DTC B1613 #

Q: Can a blown fuse cause B1613?
A: Not directly. B1613 is about a short to battery, not a loss of power. However, repeated fuse failures may indicate underlying wiring problems related to this code.

Q: Will replacing the rear wiper switch always fix B1613?
A: Not always. If the root cause is damaged wiring or a faulty BCM, replacing the switch alone won’t resolve the issue. Always diagnose before replacing components.