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Home / DTC / C1988 — Failure in the yellow warning light circuit failure

C1988 — Failure in the yellow warning light circuit failure

Detailed page for trouble code C1988.

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Code

C1988

LAND ROVER C — Chassis

Failure in the yellow warning light circuit failure

Brand: LAND ROVER
Type: C — Chassis
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Page language: EN

Causes

  • Burnt or failed warning lamp (bulb or LED) in the instrument cluster
  • Open or shorted wiring in the lamp circuit
  • Corroded or loose connector at the instrument cluster or body control module (BCM)
  • Failed lamp driver in the instrument cluster or BCM
  • Blown fuse or poor ground connection
  • Aftermarket modification or damaged loom during repairs

Symptoms

  • Yellow warning lamp does not illuminate when it should
  • Yellow warning lamp stays illuminated continuously
  • Intermittent operation of the yellow warning lamp
  • Related instrument cluster warnings or multiple lamp faults
  • Possible stored communication or body electronics codes

What to check

  • Read all stored codes and freeze frame data with a capable diagnostic tool; note related body/cluster or communication codes
  • Visually inspect instrument cluster area, connectors, and wiring harness for damage or corrosion
  • Check relevant fuses and ground points for security and continuity
  • Confirm lamp behavior with ignition ON (key ON engine OFF) and during bulb test if available
  • Perform a wiggle test on harness/connectors while observing lamp and live data
  • Inspect for recent repairs or aftermarket equipment that may have affected the circuit

Signal parameters

  • Lamp driver command (ON/OFF) from BCM or instrument cluster (logical status)
  • Circuit voltage at lamp connector (expected ~0–12 V depending on driver state)
  • Resistance/continuity of lamp circuit to instrument cluster and to ground (ohms)
  • Current draw on lamp circuit (mA) — compare to specification
  • CAN/CAN-FD messages for lamp status and BCM/cluster communication

Diagnostic algorithm

  1. Connect a diagnostic scanner, record all codes and live data. Confirm C1988 and any related codes. Note freeze frame conditions.
  2. Clear codes and attempt to reproduce the fault to confirm persistence.
  3. Visually inspect the instrument cluster, connectors, wiring harness, and ground points for damage, corrosion, or loose pins.
  4. With ignition ON (engine OFF), verify expected lamp behavior or perform the cluster lamp test. Observe scanner lamp status parameter while commanding the lamp if possible.
  5. Probe voltage at the lamp connector: with command ON there should be the specified drive voltage; with command OFF there should be no drive (or low voltage per spec).
  6. Check continuity between the lamp and the instrument cluster/BCM connector. Check resistance to ground where applicable. Repair any open/short.
  7. If wiring and connectors are good, test or replace the warning lamp (bulb/LED module) and retest.
  8. If lamp and wiring are good but driver does not command correctly, inspect BCM/instrument cluster outputs. Swap with a known-good cluster or module if available, or bench-test the cluster per manufacturer procedure.
  9. Check for available software/firmware updates for the instrument cluster/BCM and perform reprogramming if directed by technical service information.
  10. After repairs, clear codes and verify the fault does not return under expected operating conditions.

Likely causes

  • Damaged wiring or poor connector at the instrument cluster
  • Failed lamp (LED or bulb) inside cluster
  • Faulty driver output on the instrument cluster or BCM
  • Corroded ground or blown fuse affecting the lamp circuit

Fault status

⚠️ Status
C1988 — Yellow warning lamp circuit failure detected. Inspect lamp, wiring, connectors, ground, and instrument cluster/BCM drivers.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

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Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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