Code
B2815
HUMMER
B — Body
Steering Wheel Controls Illegal Resistance Value
Views:
UK: 9
EN: 10
RU: 10
AI status
Completed
Completed
100%
Causes
- Open circuit or high resistance in steering wheel control wiring
- Short to ground or battery (low resistance) on control circuit
- Damaged or worn clock spring/spiral cable in steering column
- Faulty steering wheel switch assembly (buttons/contacts)
- Corroded/loose connector pins or water ingress
- Aftermarket radio/steering control interface or incorrect replacement part
Symptoms
- Steering wheel audio/cruise/phone controls inactive or intermittent
- Buttons produce incorrect functions or multiple functions at once
- DTC B2815 (or related steering wheel control codes) stored in BCM/radio
- Possible erratic radio/infotainment behavior or reduced steering control features
What to check
- Scan modules and record DTCs and freeze-frame data; note related codes
- Visual inspection of steering column harness, connectors and clock spring for damage or contamination
- Wiggle test harness/connectors while watching live data for changes
- Measure resistance/continuity of steering wheel control circuit at radio/BCM connector and at steering wheel connector (with steering wheel switches operated)
- Check for unexpected continuity to ground or battery on the control circuit
- Verify any aftermarket adapters/wiring were installed correctly or remove for test
Signal parameters
- Circuit is a resistive ladder or unique resistance per button; expected change in resistance when different buttons are pressed
- When idle (no button) resistance should be stable/open or at a defined reference value — factory data required for exact values
- Illegal condition = resistance value outside factory tolerance (too high = open/high resistance, too low = short)
- Measure with a DMM (ohms) across the appropriate pins while operating buttons; measure voltage on signal line while pressing buttons if required by OEM procedure
Diagnostic algorithm
- Connect a scan tool and confirm B2815; record any related codes and live data while pressing steering wheel buttons.
- Visually inspect connectors at steering wheel, clock spring area and the BCM/radio connector for corrosion, bent pins or water intrusion.
- Perform wiggle testing of the column harness and connectors while monitoring live data or resistance to reproduce fault.
- With battery disconnected if required by OEM, measure resistance/continuity of the control circuit from the module connector back to the steering wheel connector. Compare pressed vs released values and look for opens or shorts.
- If resistance at module connector is correct but abnormal at steering wheel connector, suspect clock spring or steering wheel switch assembly—remove trim and test at the clock spring harness.
- If clock spring is defective or wiring damaged, repair or replace the clock spring and/or steering wheel switch assembly. Repair any chafed wiring or corroded connectors.
- If wiring and clock spring check good, test/replace the receiving module (radio/BCM) or repair its input circuit per OEM procedures.
- After repairs, clear codes and verify operation of all steering wheel controls and that B2815 does not return. Perform a road test as needed.
Likely causes
- Damaged clock spring (most common in column-related failures)
- Broken or chafed wiring at steering column harness or connector
- Failed steering wheel switch/contact assembly
- Corroded connector pins or contamination in connector
- Incorrectly installed aftermarket steering control adapter
Fault status
Status
Illegal resistance value detected on steering wheel controls circuit — indicates an unexpected/open/short or out-of-spec resistance reading on the steering wheel button/resistive ladder circuit.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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