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 8

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.

The B176112 fault code on the Atto 8 indicates a short to power in the left front wiper motor control circuit. This is a high-severity fault that can cause unintended wiper operation, failure to switch off, blown fuses, or wiring overheating. Common causes include damaged wiring insulation near the firewall or hinge area, or an internal wiper motor short. Visit an authorised dealer for diagnosis and repair. Typical repair cost data is available from recorded cases.
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Cases Logged
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Causes
Likely Causes — Atto 8
  • 1Damaged insulation on the left front wiper motor wiring harness contacts the body metal frame or power supply wiring, causing a short circuit. Long-term chafing at the firewall pass-through or front compartment hinge commonly causes this.
  • 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 stuck closed or relay internal short circuit, continuously supplying power to the motor.
  • 4BCM to wiper motor control circuit (e.g., low-speed and high-speed wires) shorted to 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 codes 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 dashboard 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 measure 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 hood hinge) for signs of harness damage, crushing, or wear. 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 power; it should be 0V. A 12V reading on the control wire indicates a short 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 (approx. 60-100Ω). Inspect the contacts for burning or sticking. Replace the relay if necessary and inspect 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 8 Fault Codes
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.B1109DTC B1109 indicates an open circuit in the communication line between the air conditioning system PM2.5 air quality sensor (dust concentration sensor) and the air conditioning control unit (AC ECU), or an open circuit within the sensor internal circuitry. Typically located in the air conditioning intake duct, this sensor monitors real-time PM2.5 particle concentration inside and outside the vehicle. It provides data to the automatic air conditioning system for intelligent switching between fresh air and recirculation modes and for controlling the air purification device. During an open circuit fault, the AC ECU cannot receive the air quality signal, triggering the system fail-safe mode. Symptoms typically include failure of the automatic recirculation function, abnormal air purification indicator light operation, or abnormal air quality data displayed on the air conditioning panel. Severe cases may compromise the cabin environment control strategy, but do not directly affect vehicle driving safety.B110A02DTC B110A02 indicates the thermal management master control unit (HVAC ECU) or body control module (BCM) failed to receive valid CAN data frames from the PM2.5 air quality sensor over consecutive communication cycles (typically 500ms per cycle). The sensor typically mounts at the HVAC unit air inlet or behind the glove box and transmits real-time particulate concentration data (unit: μg/m³) to the HVAC controller via the CAN bus. The fault is essentially a communication link layer timeout. Potential causes include physical layer wiring faults, sensor power supply failures, sensor internal MCU lockup, or CAN network topology damage. Although this non-critical fault does not directly affect driving safety, it disables the intelligent air purification strategy and the automatic fresh air/recirculation switching function. In extreme cases, it triggers a thermal management system degraded mode, limiting compressor power or fixing the air flap position.B110B07This fault code indicates abnormal operation of the internal air pump (sampling pump) in the PM2.5 air quality detection module. The PM2.5 detector uses the laser scattering principle to measure particulate concentration and requires a built-in air pump to draw ambient air into the detection chamber at a constant flow rate. The ECU sets this code when it detects an open or short in the air pump drive circuit, abnormal current (stall or free-running), or abnormal speed feedback. This fault causes the automatic air conditioning system to lose air quality sensing capability, preventing automatic switching between fresh air and recirculation modes. The instrument cluster air quality display may show '--' or a fixed value, but the fault does not affect the vehicle powertrain or basic air conditioning cooling and heating functions.B173CDTC B173C indicates the Supplemental Restraint System (SRS) detects the Right Second Row Side Airbag squib circuit resistance exceeds the calibrated threshold (typically >4.5Ω). This fault is an active diagnostic result of the SRS system, indicating a high-resistance condition in the circuit between the Airbag Control Unit (ACU) and the airbag module. Causes for excessive resistance include increased contact resistance, a partially broken wiring harness, terminal oxidation, or an aging squib wire inside the airbag module. This fault causes the system to mark the airbag circuit as 'unreliable', meaning the airbag may fail to deploy during a collision. The fault typically illuminates the instrument cluster airbag warning light (SRS light) continuously, and some models also sound a warning buzzer.
Common problems reported for Atto 8 →Atto 8 overview →
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.