B0103

Code

Generic B — Body

Sensor Cleaning Air Blower Actuator B Control

Brand: Generic

Type: B — Body

Views: UK: 24 EN: 36 RU: 26

AI status

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Page language: EN

Causes

Open or short in the actuator B control wiring
Poor connector contact or corrosion at actuator B
Failed actuator (motor/gears)
Blown fuse or faulty relay feeding the actuator circuit
Grounding fault or high-resistance ground
Control module (BCM/HVAC module) output driver fault

Symptoms

Sensor cleaning air blower B does not operate or operates intermittently
Reduced or no airflow from the sensor cleaning outlet associated with actuator B
Clicking, grinding or unusual noise from actuator area
HVAC or body control related warning or fault messages
DTC B0103 stored and may reappear after clearing

What to check

Read stored codes and freeze frame data with a scan tool; record related HVAC/body codes
Visually inspect actuator B connector and wiring for damage, corrosion, or pin push-out
Verify fuse and relay for the sensor cleaning/blower circuits
Back-probe actuator connector to check supply voltage and ground with system operating
Measure resistance of actuator windings (compare to service specification)
Perform an actuator command/output test from the scan tool if available

Signal parameters

Supply voltage at actuator power terminal: ~11–14 V when circuit powered
Control signal: either switched ground/power or PWM; duty cycle varies by command
Expected ground continuity to chassis:
Actuator winding resistance: refer to service manual (typical small DC motors often a few ohms to tens of ohms)
Actuator current draw: should be within manufacturer spec; excessive current indicates binding or motor fault

Diagnostic algorithm

Connect scan tool, read/record all codes and live data. Attempt an actuator output test from the tool.
Visually inspect harness and connector for damage, corrosion, or loose pins. Repair as needed.
Verify related fuses and relays. Replace any blown components and retest.
Back-probe the actuator connector while commanding the actuator: verify battery voltage at supply terminal and proper control signal at control terminal (or continuity to ground if switched).
Measure actuator winding resistance with connector disconnected. Compare to specification. Very high/OL indicates open winding; very low/short indicates internal short.
If electrical values are correct, check for mechanical binding by manually moving linkage/damper (power off) and confirming free movement.
If actuator fails electrical or functional tests, replace actuator B. If actuator tests good but control signal missing/erratic, investigate upstream wiring and module driver outputs.
After repairs, clear codes, cycle system and verify proper operation; re-scan to confirm code does not return.

Likely causes

Faulty actuator motor or internal gearbox
Broken or disconnected harness to actuator B
Corroded or loose terminal at the actuator connector
Blown fuse or relay for sensor cleaning blower circuit
Control module driver failure (less common)

Fault status

⚠️ Status

Control module detected a fault in Sensor Cleaning Air Blower Actuator B control circuit (open/short/actuator failure). Inspect wiring, connector, fuse/relay and the actuator; test module output if wiring and actuator are good.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours