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Home / DTC / B2426 — Passenger solar radiation sensor - open circuit

B2426 — Passenger solar radiation sensor - open circuit

Detailed page for trouble code B2426.

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22,491specific
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Code

B2426

LAND ROVER B — Body

Passenger solar radiation sensor - open circuit

Brand: LAND ROVER
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Broken or chafed wiring in the sensor circuit
  • Corroded, loose or disconnected sensor connector
  • Failed solar radiation sensor (photodiode/photocell)
  • Water ingress or contamination at the sensor or connector
  • Poor ground or supply fault to sensor
  • Faulty climate control module (rare)

Symptoms

  • Automatic climate control using default values or not responding to sunlight
  • Interior climate comfort imbalance on passenger side
  • Possible driver information message or stored DTC in HVAC module
  • Reduced A/C efficiency or unusual blower/vent behavior under sunlight

What to check

  • Confirm DTC B2426 stored in HVAC/Body module and note freeze frame data if available
  • Visual inspection of passenger dash top area where sensor is located for damage or water entry
  • Check sensor connector for corrosion, bent pins, or moisture
  • Measure supply voltage at sensor connector with ignition ON
  • Measure signal voltage at sensor while covering/uncovering the sensor (dark bright)
  • Check continuity between sensor connector and climate control module pin (resistance/shorts to ground)

Signal parameters

  • Sensor typically uses a reference/supply from the HVAC module (commonly ≈5 V reference) — verify against model-specific data
  • Signal output varies with light level (expected ~0 V or very low in darkness, increasing with sunlight; often within 0–5 V range)
  • Open-circuit condition = very high/infinite resistance or no signal voltage present at the module input
  • Continuity to module ground and reference supply should be near 0 ohms for ground and stable reference voltage for supply

Diagnostic algorithm

  1. Retrieve and record all HVAC-related DTCs and freeze frame data. Note whether other solar sensor codes are present (e.g., driver sensor).
  2. Perform visual inspection of the passenger solar sensor, housing, and connector for damage, debris or water ingress. Repair or dry as needed.
  3. With ignition ON (engine off unless specified), back-probe the sensor connector: verify reference/supply voltage present at the supply pin. If absent, trace supply fuse and wiring to HVAC module.
  4. Measure the sensor signal pin voltage while covering the sensor then exposing it to bright light. Voltage should change with light level. No change or no voltage = open or failed sensor.
  5. Check continuity between the sensor signal and the HVAC module input pin. High resistance or open = wiring fault; repair splice/connector or replace harness as needed.
  6. Inspect and verify ground continuity for the sensor circuit.
  7. If wiring and connectors are good and expected voltages are not present, replace the passenger solar sensor and retest.
  8. If replacing the sensor does not clear the fault and wiring is confirmed good, consider module input fault — verify with module input measurement and consult manufacturer procedures before replacing module.
  9. After repairs, clear DTCs, perform functional test (expose sensor to sunlight) and road/test cycle if required to confirm no return of the code.

Likely causes

  • Connector disconnected, corroded or pinned incorrectly at sensor
  • Open or shorted wiring between sensor and climate control module
  • Failed passenger solar radiation sensor
  • Water damage to sensor assembly or wiring

Fault status

⚠️ Status
Passenger solar radiation sensor circuit — open circuit detected (no valid signal).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B2425 B2427 B2470
268

Browse 268 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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Code

B2426

Other B — Body

Passenger Solar Radiation Sensor Circuit Open

Brand: Other
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Broken or chafed wiring in the sensor circuit
  • Corroded, loose or disconnected sensor connector
  • Failed solar radiation sensor (photodiode/photocell)
  • Water ingress or contamination at the sensor or connector
  • Poor ground or supply fault to sensor
  • Faulty climate control module (rare)

Symptoms

  • Automatic climate control using default values or not responding to sunlight
  • Interior climate comfort imbalance on passenger side
  • Possible driver information message or stored DTC in HVAC module
  • Reduced A/C efficiency or unusual blower/vent behavior under sunlight

What to check

  • Confirm DTC B2426 stored in HVAC/Body module and note freeze frame data if available
  • Visual inspection of passenger dash top area where sensor is located for damage or water entry
  • Check sensor connector for corrosion, bent pins, or moisture
  • Measure supply voltage at sensor connector with ignition ON
  • Measure signal voltage at sensor while covering/uncovering the sensor (dark bright)
  • Check continuity between sensor connector and climate control module pin (resistance/shorts to ground)

Signal parameters

  • Sensor typically uses a reference/supply from the HVAC module (commonly ≈5 V reference) — verify against model-specific data
  • Signal output varies with light level (expected ~0 V or very low in darkness, increasing with sunlight; often within 0–5 V range)
  • Open-circuit condition = very high/infinite resistance or no signal voltage present at the module input
  • Continuity to module ground and reference supply should be near 0 ohms for ground and stable reference voltage for supply

Diagnostic algorithm

  1. Retrieve and record all HVAC-related DTCs and freeze frame data. Note whether other solar sensor codes are present (e.g., driver sensor).
  2. Perform visual inspection of the passenger solar sensor, housing, and connector for damage, debris or water ingress. Repair or dry as needed.
  3. With ignition ON (engine off unless specified), back-probe the sensor connector: verify reference/supply voltage present at the supply pin. If absent, trace supply fuse and wiring to HVAC module.
  4. Measure the sensor signal pin voltage while covering the sensor then exposing it to bright light. Voltage should change with light level. No change or no voltage = open or failed sensor.
  5. Check continuity between the sensor signal and the HVAC module input pin. High resistance or open = wiring fault; repair splice/connector or replace harness as needed.
  6. Inspect and verify ground continuity for the sensor circuit.
  7. If wiring and connectors are good and expected voltages are not present, replace the passenger solar sensor and retest.
  8. If replacing the sensor does not clear the fault and wiring is confirmed good, consider module input fault — verify with module input measurement and consult manufacturer procedures before replacing module.
  9. After repairs, clear DTCs, perform functional test (expose sensor to sunlight) and road/test cycle if required to confirm no return of the code.

Likely causes

  • Connector disconnected, corroded or pinned incorrectly at sensor
  • Open or shorted wiring between sensor and climate control module
  • Failed passenger solar radiation sensor
  • Water damage to sensor assembly or wiring

Fault status

⚠️ Status
Passenger solar radiation sensor circuit — open circuit detected (no valid signal).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

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