🚨 Diagnostic Profile
Vehicle Make: Chrysler
Fault Description: ASR Active Circuit Low Too Long. The Anti-Slip Regulation (ASR) active circuit signal has remained in a low state for longer than the controller’s monitoring threshold. This may indicate a wiring fault, sensor or actuator issue, module communication problem, or a related brake system condition.
🚨 Repair Difficulty Tier
Tier: [Intermediate]
Diagnosis requires scan tool access, electrical measurement skills, and familiarity with brake and traction control system wiring. Repair complexity depends on whether the fault is a simple connector or wiring issue or a module-level failure.
🛠️ Resolution Steps
Step 1: Preliminary Inspection
- Verify battery state of charge and charging system output, since low system voltage can trigger false ASR faults.
- Connect a scan tool capable of reading Chrysler body/chassis controller codes (such as a factory-level tool or an aftermarket scanner with full-system access) and record all active, pending, and historical DTCs along with freeze frame data from the ABS/ASR (CAB or IC/ABS) module.
- Visually inspect the ASR and ABS wiring harness for chafing, pinched wires, heat damage, or aftermarket modifications, paying particular attention to harness routing near the steering knuckle, subframe, and engine bay firewall grommet.
- Inspect connectors at the ABS/ASR hydraulic control unit, wheel speed sensors, brake switch, and related components for corrosion, bent pins, or loose seating.
- Check brake fluid level and condition, and confirm tire sizes, tire pressures, and tread depth are consistent across all four wheels, since mismatched rolling diameters can cause the controller to misinterpret an ASR-active condition.
- Inspect wheel speed sensors and tone rings for damage, debris, or excessive air gap.
- Check for recent service history involving brakes, wheel bearings, or wheel speed sensor replacement, and confirm the ASR switch (if equipped as a separate dash-mounted disable switch) is functioning and not stuck engaged.
Step 2: Diagnostic Verification
- With the connector back-probed and ignition on, engine off, measure the ASR active/request circuit voltage at the ABS/ASR module connector using a digital multimeter referenced to a verified chassis ground, and compare the reading against known-good circuit behavior (an open/high circuit should read near system voltage, while an active-low circuit should read near zero volts). Do not assume a specific pin number or wire color without the factory wiring diagram for this exact model and year.
- Perform a continuity and resistance check on the ASR active circuit between the module connector and the switch, relay, or controlling component with the harness disconnected and the key off, verifying resistance is near zero ohms with no unexpected opens.
- With all related connectors disconnected, check for shorts to ground and shorts to power on the ASR circuit using the multimeter’s resistance and voltage functions.
- Use a graphing multimeter or digital storage oscilloscope to monitor the wheel speed sensor waveforms and the ASR active signal during a controlled, safe road test, watching for signal dropout, erratic transitions, or a signal that stays low beyond a normal activation event.
- Clear codes and retest through multiple key cycles and a road test to determine whether the fault is a hard fault or intermediate/intermittent in nature.
- Use the scan tool’s live data stream to cross-check ASR status, individual wheel speed values, brake switch status, and throttle/engine torque reduction requests to confirm the circuit’s behavior matches actual driving conditions.
Step 3: Resolution & Reset Process
- Repair any identified wiring faults, corroded connectors, or damaged harness sections using manufacturer-approved solder-and-heat-shrink or crimp-and-seal splice methods; avoid simple twist-and-tape repairs on safety system circuitry.
- Replace the failed component only after confirming the fault with testing, such as a faulty wheel speed sensor, ASR/ABS hydraulic control unit, dash-mounted ASR switch, or related relay.
- Clear all stored DTCs using the scan tool and perform any required module initialization, such as an ABS/ASR bleed-and-calibration procedure or steering angle sensor relearn if the hydraulic control unit was replaced, per the service information applicable to this vehicle.
- Road test the vehicle under varied conditions, including moderate acceleration from a stop, cornering, and light-to-moderate braking, to confirm the ASR active signal responds correctly and the fault does not return.
- Recheck all related modules for stored or pending codes after the road test and document final readings, test values, and repair actions taken on the repair order.
📦 Parts, Labor, and Budget Estimates
Required Components/Software:
- Wheel speed sensor(s) (front or rear, as confirmed by testing)
- Wiring harness repair kit (connector pigtail, terminals, marine-grade heat-shrink splice connectors)
- ABS/ASR dash switch (if equipped and confirmed faulty)
- ABS/ASR hydraulic control unit or module (only if confirmed faulty through testing; often requires dealer-level programming)
- Factory-level diagnostic/programming software (such as Chrysler’s StarMOBILE/StarSCAN-type dealer access) if module replacement or reflash is required
- Brake fluid, electrical contact cleaner, and dielectric grease as needed
Average Component Price:
- Wheel speed sensor: approximately $40–$150 per sensor (part only)
- Wiring harness repair kit/connector pigtail: approximately $20–$80
- ASR dash switch: approximately $30–$100
- ABS/ASR hydraulic control unit/module: approximately $400–$1,200 (part only, varies significantly by model and availability)
- Dealer programming/module coding fee, if required: approximately $100–$250
Estimated Labor Hours:
- Diagnosis and verification: 1.0–2.0 hours
- Repair or component replacement (wiring repair, sensor, or switch): 0.5–1.5 hours; module/hydraulic control unit replacement: 1.5–3.0 hours
- Reset, relearn, and road test: 0.3–0.8 hours