Code
B0100
Generic
B — Body
Sensor Cleaning Air Blower Actuator A
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring between HVAC module and actuator
- Corroded, disconnected or damaged actuator connector
- Failed blower/actuator motor or internal gears (mechanical seizure)
- Blown fuse or faulty relay supplying the actuator
- HVAC control module or BCM fault
- Obstruction preventing actuator movement (debris, ice, binding)
Symptoms
- HVAC sensor-cleaning function fails or is inoperative
- Blower speed or vent position stuck or does not change
- Audible clicking, grinding or no sound from actuator area
- DTC B0100 stored and MIL may be illuminated for body system warnings
- Inconsistent HVAC airflow or incorrect vent selection
What to check
- Scan for stored and pending codes; note freeze frame and any related HVAC/BCM codes
- Visually inspect actuator and wiring harness for damage, corrosion, loose pins or water intrusion
- Check relevant fuses and relays for continuity and correct operation
- Attempt to actuate the component with a scan tool (command and observe movement)
- Listen at the actuator for motor noise or gear chatter during commanded movement
- Check for physical obstructions in the blower/air path and duct linkages
Signal parameters
- Supply voltage (pin V+): ~12 V with ignition/accessory ON (nominal battery voltage 11–14.5 V)
- Ground: low resistance to chassis (
- Control signal: PWM or DC control — duty cycle 0–100% or 0–5 V control depending on vehicle (use scan tool to view/command)
- Expected actuator resistance: low ohms for DC motor (typically 1–50 Ω) or specified stepper/position-sensor values — compare to OEM spec
- Actuator current draw: moderate when moving; large or infinite if stalled (compare to spec)
- Response time: actuator should move within a few seconds when commanded
Diagnostic algorithm
- Read and record DTCs and related HVAC/body/communication codes. Clear codes and attempt to reproduce the fault.
- Perform a visual inspection of the actuator, connector, and harness for damage, corrosion, or water. Repair any obvious issues.
- Verify power and ground at the actuator connector with ignition ON. Check fuse/relay feeding the circuit. Repair/replace as needed.
- Use a scan tool to command the actuator through its range. Observe movement and listen for abnormal noises. Note any non-responsive behavior.
- If actuator does not respond, measure control signal (PWM or voltage) from the HVAC/BCM while commanding. If control signal present but actuator does not move, suspect actuator failure.
- If no control signal is present, back-probe wiring toward the module to find opens/shorts; check module outputs and grounds. Repair wiring or replace module as required.
- Bench-test actuator (if removable) by applying proper supply and ground and control signal to confirm operation. Replace actuator if it fails bench test.
- After repair, clear DTCs and verify system operation through multiple HVAC modes and a short road or environmental test if needed to ensure the fault does not return.
Likely causes
- Damaged/loose connector at actuator
- Failed actuator motor or internal geartrain
- Open/short in supply or ground circuit
- Obstruction preventing movement
- HVAC control module not commanding actuator (rare)
Fault status
Status
Actuator A for the sensor-cleaning air blower has an electrical or mechanical fault (no response, out-of-range, or communication error detected).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
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Code
B0100
HUMMER
B — Body
Electronic Front End Sensor 1 Performance
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring between HVAC module and actuator
- Corroded, disconnected or damaged actuator connector
- Failed blower/actuator motor or internal gears (mechanical seizure)
- Blown fuse or faulty relay supplying the actuator
- HVAC control module or BCM fault
- Obstruction preventing actuator movement (debris, ice, binding)
Symptoms
- HVAC sensor-cleaning function fails or is inoperative
- Blower speed or vent position stuck or does not change
- Audible clicking, grinding or no sound from actuator area
- DTC B0100 stored and MIL may be illuminated for body system warnings
- Inconsistent HVAC airflow or incorrect vent selection
What to check
- Scan for stored and pending codes; note freeze frame and any related HVAC/BCM codes
- Visually inspect actuator and wiring harness for damage, corrosion, loose pins or water intrusion
- Check relevant fuses and relays for continuity and correct operation
- Attempt to actuate the component with a scan tool (command and observe movement)
- Listen at the actuator for motor noise or gear chatter during commanded movement
- Check for physical obstructions in the blower/air path and duct linkages
Signal parameters
- Supply voltage (pin V+): ~12 V with ignition/accessory ON (nominal battery voltage 11–14.5 V)
- Ground: low resistance to chassis (
- Control signal: PWM or DC control — duty cycle 0–100% or 0–5 V control depending on vehicle (use scan tool to view/command)
- Expected actuator resistance: low ohms for DC motor (typically 1–50 Ω) or specified stepper/position-sensor values — compare to OEM spec
- Actuator current draw: moderate when moving; large or infinite if stalled (compare to spec)
- Response time: actuator should move within a few seconds when commanded
Diagnostic algorithm
- Read and record DTCs and related HVAC/body/communication codes. Clear codes and attempt to reproduce the fault.
- Perform a visual inspection of the actuator, connector, and harness for damage, corrosion, or water. Repair any obvious issues.
- Verify power and ground at the actuator connector with ignition ON. Check fuse/relay feeding the circuit. Repair/replace as needed.
- Use a scan tool to command the actuator through its range. Observe movement and listen for abnormal noises. Note any non-responsive behavior.
- If actuator does not respond, measure control signal (PWM or voltage) from the HVAC/BCM while commanding. If control signal present but actuator does not move, suspect actuator failure.
- If no control signal is present, back-probe wiring toward the module to find opens/shorts; check module outputs and grounds. Repair wiring or replace module as required.
- Bench-test actuator (if removable) by applying proper supply and ground and control signal to confirm operation. Replace actuator if it fails bench test.
- After repair, clear DTCs and verify system operation through multiple HVAC modes and a short road or environmental test if needed to ensure the fault does not return.
Likely causes
- Damaged/loose connector at actuator
- Failed actuator motor or internal geartrain
- Open/short in supply or ground circuit
- Obstruction preventing movement
- HVAC control module not commanding actuator (rare)
Fault status
Status
Actuator A for the sensor-cleaning air blower has an electrical or mechanical fault (no response, out-of-range, or communication error detected).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
Manual library for HUMMER
138
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