AU
B176112

DTC B176112 indicates a short to power in the left front wiper motor control circuit (although some documents incorrectly label this as an airbag fault, the BYD DTC system designates B17 for the wiper system) — Atto 3

Safety System

DTC B176112 indicates a short to power in the left front wiper motor control circuit (although some documents incorrectly label this as an airbag fault, the BYD DTC system designates B17 for the wiper system).

This occurs when the Body Control Module (BCM) detects an abnormally low-resistance connection between the left front wiper motor power or control line and battery positive (B+), causing an abnormal increase in circuit current.

Symptoms include unintended wiper operation, inability to turn off the wipers, continuous high-speed operation, or complete failure.

Severe cases risk wiring harness overheating, blown fuses, or electrical fire.

Damaged wiring insulation, internal motor winding breakdown, or sticking relay contacts typically cause this short to power.

5
Cases Logged
5
Causes
Likely Causes — Atto 3
  • 1Damaged insulation on the front left wiper motor wiring harness contacts the metal body frame or power supply wiring, causing a short circuit. Long-term chafing at the firewall wiring pass-through or motor compartment hinge commonly causes this damage.
  • 2Damaged insulation on the wiper motor internal armature winding or a shorted carbon brush holder, causing continuity between the motor terminal and the housing.
  • 3Wiper motor relay contacts welded or relay internally shorted, continuously supplying power to the motor.
  • 4Control circuit from the BCM to the wiper motor (e.g., low-speed and high-speed wires) shorted to the power supply harness.
  • 5Water ingress or corrosion in the left front wiper motor connector causing a short circuit between the power and signal pins.
What To Do
  • 1
    Connect the VDS diagnostic tool to read the fault code and record freeze frame data. Confirm B176112 is currently present and is a hard fault. Check for accompanying related fault codes (such as B176113 short to ground).
  • 2
    Check the condition of the left front wiper motor fuse (usually 30A or 40A) in the instrument panel power distribution box or engine compartment fuse box. If blown, identify the cause of the short circuit before replacing the fuse.
  • 3
    Disconnect the left front wiper motor 4-pin or 6-pin connector. Use a multimeter to check continuity between the motor-side low-speed and high-speed terminals and the power supply positive terminal. If continuity exists, replace the wiper motor assembly.
  • 4
    Visually and physically inspect the left front wiper motor wiring harness routing (especially the corrugated conduit passing through the firewall and bonnet hinge) for signs of damage, pinching, or abrasion. Repair and rewrap any damaged sections.
  • 5
    Keep the motor connector disconnected. Measure the voltage between the harness-side power wire (constant power) and ground; it should be 12V. Measure the voltage between the low-speed/high-speed control wire and the power supply; it should be 0V. If the control wire measures 12V, the circuit is shorted to power. Inspect the wiring harness routing.
  • 6
    Check the wiper motor relay (usually located in the front compartment power distribution box). Measure the relay coil resistance (approximately 60-100Ω). Check the contacts for burning or sticking. Replace the relay if necessary and check the relay socket terminals.
  • 7
    If the wiring harness and motor are normal, check the BCM output terminal for a continuous high-level output. If necessary, update the BCM software or replace the BCM.
  • 8
    After repair, clear the fault code and perform a full functional test of the wiper system: low speed, high speed, intermittent mode, park function, and washer-linked operation. Confirm the fault does not recur.
Real-World Cases
BYD DTC AI Analysis

BYD Song MAX: LH front wiper wiring harness chafed, causing short circuit

✓
Driving in rain, the wipers suddenly stopped working and the instrument cluster displayed a wiper system fault. VDS read DTC B176112. The fuse was not blown, but removing the left front A-pillar trim revealed the wiper motor harness had chafed through at the firewall penetration. Long-term friction against the metal edge had worn through the insulation, causing the power wire to short to body. Repaired the damaged section with insulating tape, fitted corrugated tubing for protection, and rerouted the harness to avoid contact with sharp edges. Fault eliminated.
Original source ↗
BYD DTC AI Analysis

BYD Qin Pro windscreen wiper motor intermittent failure

✓
Wipers occasionally failed in automatic mode but worked normally in manual mode. The scan tool showed codes but no warning light illuminated on the instrument cluster. BCM stored DTC B176112 for abnormal motor position feedback signal. Found slight oxidation on the wiper motor connector pins increasing contact resistance, and worn internal carbon brushes producing metal debris that caused an intermittent short circuit. Replaced the front wiper motor assembly, cleaned the BCM connector and applied conductive grease. Cleared the fault codes; the issue has not reoccurred.
Original source ↗
BYD DTC AI Analysis

BYD Tang DM wiper relay contacts stuck, causing continuous operation

✓
After starting the vehicle, the wipers ran automatically and could not be turned off, continuing to run for several seconds after switching off the ignition. The scan tool pulled DTC B176112 (Wiper Motor Control Circuit Short to Power). Inspection found the wiper motor relay contacts had welded in the front compartment power distribution box, keeping the motor powered continuously. The wiring insulation between the BCM and relay control line had also chafed through against a nearby power harness, shorting to power. Replaced the wiper relay, repaired the damaged harness, and updated the BCM software (fixing a control logic bug in early models). Fault completely resolved.
Original source ↗
BYD DTC AI Analysis

BYD E2 wiper motor internal short circuit

✓
Owner stated the fuse blows immediately upon activating the wipers. The fault persisted after fuse replacement. Scanned fault code B176112. Disconnected the left front wiper motor connector and measured resistance across the terminals. Continuity between the high-speed terminal and housing measured 0.5Ω, indicating internal armature winding insulation breakdown with a short to power. Replaced the left front wiper motor assembly. Checked the related wiring harness and found no damage. Replaced the 30A fuse and verified the repair. All wiper speed functions tested normal.
BYD DTC AI Analysis

BYD Qin EV wiper connector shorted due to water ingress

✓
After the vehicle waded through water, the wipers would not shut off. The scanner showed DTC B176112. The left front wiper motor sits low in the engine bay. Its connector seal had deteriorated, letting water in during the wading. This created an electrolyte conductive path between the power and high-speed pins inside the connector, causing a short to power. Drained the water and cleaned corrosion from the connector, cleaned the pins with electronic cleaner, applied waterproof silicone grease, and replaced the waterproof seal. Fault resolved. Advised the owner to avoid deep water.
Other Atto 3 Fault Codes
P0A0DBattery Energy Control Module Requested MIL IlluminationP0AA6Hybrid Battery Voltage System Isolation FaultP1A00Drive Motor "A" Performance — BYD proprietaryB1108For the BYD Song MAX (2017–2019), DTC B1108 indicates a short circuit in the PM2.5 air quality detection module (dust sensor) or its wiring harness. The sensor uses laser scattering to detect in-cabin and outside PM2.5 concentrations and transmits data to the HVAC ECU via the LIN bus or an analog signal. Short circuit conditions include: 1) Sensor power supply wire (+5V/+12V) shorted to ground 2) Signal wire shorted to power or ground 3) Short circuit in the sensor's internal photoelectric detection circuit This fault prevents the automatic climate control from switching between fresh air and recirculation based on air quality. The system enters fail-safe mode (typically forced recirculation). Severe short-circuit current can destroy the HVAC ECU sampling circuit. The system classifies this as a Level 3 severe fault and restricts vehicle operation to prevent electrical fires or controller damage. For other BYD models (such as the Qin EV, E5, and Song DM), B1108 indicates a driver-side sunload sensor fault, reflecting differences in DTC definitions across models.B110811This DTC indicates a short circuit in the air conditioning system PM2.5 air quality sensor (rapid detector). Specifically, abnormal continuity exists between the sensor power supply circuit or signal output circuit and body ground or battery positive. This causes the control module (ACU/air conditioning controller) to detect abnormal current or a voltage signal outside the valid range (typically 0V or supply voltage). The PM2.5 sensor monitors internal and external particulate concentrations, providing the data the automatic air conditioning system uses to switch between fresh air and recirculation modes. A short circuit disables the air quality monitoring function. This fault may force the air conditioning system into recirculation protection mode and trigger related thermal management system faults, as the air conditioning system acts as a key actuator in vehicle thermal management. In severe cases, the short circuit current can damage the internal sampling circuit of the air conditioning controller or overheat the wiring harness.
Data confidence: Official This information is for reference only. Always consult a qualified technician for diagnosis and repair. Do not attempt high-voltage system repairs yourself.