B1613 — Wiper Rear Mode Select Switch Circuit Short To Battery

B1613 — Wiper Rear Mode Select Switch Circuit Short To Battery. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: corroded or loose connectors, faulty switch, motor or actuator of the affected system, body control module (BCM) fault.

body electrical

Is it safe to drive?

Short-term driving is OK Usually safe to drive — body codes rarely affect drivability. Exceptions: exterior lighting and wipers in bad weather, and central locking faults that can leave the car unsecured.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm B1613 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many B0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the body electrical system for damage, corrosion, chafing or poor contact.
Subsystem check Operate the affected function while watching its switch and motor PIDs in live data.
Subsystem check Inspect connectors and wiring at flex points (door jambs, tailgate hinges) — wires break there first.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm B1613 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for B1613 (parts and labor, USD, independent shop rates): BCM repair or replacement: $300–$900; Replace the switch or actuator: $120–$450; Repair wiring or connectors: $80–$250. Overall, fixing B1613 usually costs between $80 and $900. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

What is the most common cause of B1613?

The most common causes are: corroded or loose connectors, faulty switch, motor or actuator of the affected system, body control module (BCM) fault.

How do I diagnose B1613 myself?

Start with a scan: confirm B1613, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the body electrical system, and verify the suspect component against live data before buying parts.

What are the symptoms of B1613?

Drivers most often notice: warning light on the dashboard, no impact on engine operation in most cases, the affected function (locks, windows, lighting, wipers) works intermittently or not at all.

How much does it cost to fix B1613?

BCM repair or replacement — $300–$900; Replace the switch or actuator — $120–$450; Repair wiring or connectors — $80–$250. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

What does OBD2 code B1613 mean?

When your scan tool pulls code B1613, it's telling you that the vehicle's control module has detected an abnormal voltage condition in the rear wiper mode select switch circuit. Specifically, the system has found a short to battery — meaning somewhere in that circuit, power is bleeding where it shouldn't be. This falls under the body electrical category in the OBD2 standard, so the engine computer itself isn't directly affected, but the body control module is flagging a fault that needs attention.

The body control module (BCM) constantly watches the switches, motors, and actuators scattered throughout your vehicle's interior and exterior. When a circuit like the rear wiper mode selector shows a reading outside its normal operating range for too many drive cycles, the module logs B1613 and triggers the check engine or body system warning light. The freeze frame data stored alongside the code is valuable — it captures exactly what the engine was doing (RPM, load, temperature, vehicle speed) when the fault first appeared. That snapshot gives you a starting point instead of guessing blind.

B1613 is specific to the rear wiper mode select circuit, which means your rear wiper function is either acting erratically or not working at all. Depending on your vehicle's setup, this might also tie into related body functions, so symptoms can vary.

Symptoms of B1613

Dashboard warning light stays on after the fault is detected
Rear wiper fails to operate or cycles through modes unexpectedly
Front wiper or other body functions behave oddly if they're on the same circuit
Engine performance and drivability remain unaffected in most cases
Intermittent operation — the feature works sometimes, then cuts out
In some vehicles, related switches (like washer controls) may also malfunction

Common causes of B1613

Blown fuse or faulty relay feeding the rear wiper circuit
Corroded, damaged, or loose electrical connectors near the wiper motor or switch
The rear wiper mode select switch itself has failed internally
Faulty rear wiper motor or actuator that draws abnormal current
Body control module (BCM) internal failure or software glitch
Wiring damage in high-movement areas like door jambs or tailgate hinges where wires flex repeatedly
Water intrusion or moisture buildup that creates short circuits in the harness

How to diagnose B1613 step by step

Hook up an OBD2 scanner and verify that B1613 is stored as an active or pending code. Record the freeze frame data — note the RPM, engine load, coolant temperature, and vehicle speed recorded when the fault occurred.
Look for any related diagnostic trouble codes. Codes in the same family often point to the real culprit. Also check manufacturer technical service bulletins (TSB) for your specific make and model — some B-series codes have known factory fixes or require software updates.
Visually trace the wiring harness for the rear wiper circuit. Focus on connectors at the wiper motor, the mode select switch, and any junction points. Look for broken insulation, corrosion, bent pins, or pushed-out terminals.
Access live data and operate the rear wiper switch while monitoring voltage at the circuit. This tells you whether the switch is sending the correct signal or if the reading jumps unexpectedly (indicating a short to battery).
Pay close attention to flex points — areas where wires pass through doors, the tailgate, or around hinges. Repeated movement causes internal wire breaks that may only show problems when the weather is wet or the temperature swings.
Clear the code, then drive the vehicle through a complete drive cycle, mimicking the conditions stored in the freeze frame. If B1613 returns, you've confirmed an active fault and can narrow down the circuit section causing the problem.

Repair options and realistic costs

Addressing B1613 means fixing whichever component in the rear wiper circuit has failed. Repairs range from simple connector fixes to full module replacement:

BCM repair or replacement: $300–$900
Rear wiper mode switch or motor replacement: $120–$450
Wiring harness repair or connector replacement: $80–$250

Total repair costs for B1613 typically fall between $80 and $900 depending on what needs fixing. Labor rates at independent shops vary, but parts are usually the smaller line item. Always confirm the exact failing component before spending money on a module — the BCM is the most expensive part on the list and rarely the culprit.

Can you drive with B1613?

Generally yes — body electrical faults like B1613 don't compromise engine operation or transmission function. Your vehicle remains driveable in most cases. That said, consider the practical risks: if the rear wiper is inop and you're caught in rain or snow, visibility suffers. Central locking or exterior lighting faults tied to the same circuit can leave you with an unsecured vehicle or reduced visibility at night. Use your judgment, and get the problem diagnosed before bad weather arrives.