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Home / DTC / C1977 — Audio steering wheel switch - short circuit to ground

C1977 — Audio steering wheel switch - short circuit to ground

Detailed page for trouble code C1977.

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Code

C1977

LAND ROVER C — Chassis

Audio steering wheel switch - short circuit to ground

Brand: LAND ROVER
Type: C — Chassis
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged/chafed wiring harness to steering wheel switches
  • Shorted connector or pin to chassis ground
  • Faulty steering wheel audio switch assembly
  • Worn or damaged clockspring (spiral cable)
  • Corroded connector pins or poor mating
  • Fault in audio/head unit or steering module electronics

Symptoms

  • Steering wheel audio controls not responding or intermittent
  • Other steering wheel switches (if present) may also malfunction
  • Steering wheel module or audio unit warning messages
  • Possible stored communication errors with audio/BCM
  • Related fuses may blow (less common) or erratic system behavior

What to check

  • Read and record all stored DTCs and freeze frame data with a capable scan tool
  • Visual inspection of steering column wiring, connectors and clockspring for damage or corrosion
  • Check connector pins at steering wheel, clockspring, and audio/head unit for bent or pushed-out pins
  • Measure voltage at the audio module / steering module harness with ignition ON
  • Check continuity from suspect switch circuit to ground with connectors disconnected
  • Inspect for aftermarket accessories or previous repairs in the steering column area

Signal parameters

  • Reference supply to steering wheel switch typically 5 V (or module specific); expected open-circuit ~ reference voltage
  • When a switch is activated the circuit is normally pulled to ground through defined resistances; a hard short to ground will read ~0 V with key ON
  • Switch continuity when pressed: low resistance (a few ohms to several hundred ohms depending on design)
  • Park the steering wheel straight and verify clockspring continuity across rotation range
  • CAN/LIN communication present and error-free when no comm-related DTCs are present

Diagnostic algorithm

  1. Retrieve all stored codes and freeze data. Note related communication codes (U-codes, B-codes).
  2. Attempt to clear the code and see if it returns. If it returns immediately or during test drive proceed with wiring checks.
  3. Perform a careful visual inspection of the steering wheel, airbag connector area, clockspring, and harness for damage, pin corrosion, or pushed-out terminals.
  4. With ignition ON, backprobe the steering wheel switch circuit at the steering column/steering module connector and measure voltage to ground. A hard short will show near 0 V.
  5. If available, unplug the steering wheel connector/clockspring connector and measure resistance between the suspect circuit and ground. If the short disappears with connector unplugged, the short is in the steering wheel/clockspring area.
  6. Wiggle test the harness and clockspring while monitoring voltage/continuity to check for intermittent shorts caused by movement.
  7. Inspect and test the clockspring: check continuity across dedicated switch conductors through full wheel rotation. Replace clockspring if any open/shorts are found or if physical damage is present.
  8. If wiring to the clockspring checks good, inspect harness routing to the audio/steering module and repair any chafed or damaged sections. Repair or replace corroded connectors/pins.
  9. If wiring and clockspring are good, test or swap the steering wheel switch assembly (where serviceable) or test the audio/steering module inputs per manufacturer procedures.
  10. After repairs, clear codes, perform functional test of steering wheel switches and a road test to confirm the code does not return.
  11. Safety note: follow manufacturer procedure for disabling the airbag and disconnecting battery before removing the steering wheel or clockspring. Allow required capacitive discharge time.

Likely causes

  • Wiring insulation rubbed through where harness passes the steering column
  • Pin pushed out of connector and contacting steering column
  • Clockspring internal short or broken conductor
  • Audio switch contact failed and is permanently grounded
  • Water intrusion/corrosion at steering wheel connector

Fault status

⚠️ Status
Audio steering wheel switch - short circuit to ground detected on the steering wheel audio switch circuit.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

C1976 C1978 C1979 B1870 U0155
413

Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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