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Home / DTC / B1294 — Climate control relay - short circuit in the battery

B1294 — Climate control relay - short circuit in the battery

Detailed page for trouble code B1294.

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Code

B1294

LAND ROVER B — Body

Climate control relay - short circuit in the battery

Brand: LAND ROVER
Type: B — Body
Views: UK: 6 EN: 9 RU: 7
AI status
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Page language: EN

Causes

  • Damaged wiring harness with short to battery (insulation abrasion, pinched cable)
  • Failed climate control relay with internal short
  • Corroded or bridged connector terminals at relay or HVAC module
  • Aftermarket accessory or improper wiring spliced into HVAC power circuit
  • Water ingress causing corrosion or conductive path
  • Faulty HVAC control module or relay driver output stuck high

Symptoms

  • HVAC blower, compressor or vent functions inoperative or intermittent
  • HVAC fuse(s) blow repeatedly or are found melted
  • Battery drain when ignition off (parasitic draw)
  • HVAC warning messages or lamps displayed on dash
  • Related electrical functions on same circuit may behave oddly

What to check

  • Read and record freeze-frame and any related HVAC/BCM/PCM codes with a scan tool
  • Visually inspect relay, relay socket, fuses and nearby wiring for damage, melting or corrosion
  • Check fuse(s) protecting HVAC/climate relay circuit for correct rating and continuity
  • With ignition off and battery disconnected, inspect connector pins for corrosion, push-out debris or exposed conductors
  • Measure battery voltage and note state before tests (use a multimeter)
  • Use a wiring diagram to identify relay supply, control and ground circuits before probing

Signal parameters

  • Battery voltage (approx. 12.4–12.8 V resting; ~13.5–14.7 V running)
  • Relay supply pin expected: battery B+ (constant) on feed side; control/coil pin expected: switched by HVAC module (should not be constant B+ when off)
  • Relay coil resistance: manufacturer spec (typical ~50–200 ohms for small relays)
  • Control module output voltage: 0 V (ground switching) or switched to ground; should not read continuous B+ when de-energized
  • Fuse continuity (ohms)

Diagnostic algorithm

  1. Safety first: disable HVAC and electronic loads, park vehicle, set parking brake; disconnect battery negative when performing connector repairs.
  2. Connect scanner, confirm B1294 and any related codes; record freeze-frame and live data for HVAC relay control state.
  3. Visually inspect relay, socket and harness for heat damage, melted plastic or corrosion. Replace damaged relay and socket if obvious.
  4. Remove the climate control relay. With ignition off, check continuity between the relay control circuit and battery B+ — there should NOT be direct continuity to B+ on the control/driver circuit.
  5. With battery connected and ignition ON (or per service manual), backprobe the relay control pin: verify control module is commanding the relay properly (voltage should be as specified — typically pulled to ground to actuate). If the control pin is at constant B+, isolate wiring and connector.
  6. If control circuit reads B+ with relay removed, trace wiring with wiring diagram; disconnect sections (harness connectors) to find a connector or harness segment where the short disappears.
  7. Check for parasitic current: remove relay and measure current draw; if draw drops significantly the short is in that circuit. If required, use an amp clamp on the feed to localize.
  8. If wiring checks good, test/replace HVAC control module or relay driver following manufacturer procedures; reprogram if required.
  9. After repairs replace any damaged relays, wiring, and fuses; clear codes and perform functional test of HVAC across operating modes and a road test to confirm.
  10. Note: Use fused test leads and avoid creating new shorts. If unsure, consult wiring diagrams or a dealer-level data source.

Likely causes

  • Shorted relay coil or contacts internally
  • Chafed wire contacting constant B+ circuit where routed
  • Connector terminal melted/corroded creating positive feed to control circuit
  • Failed relay driver in HVAC module outputting battery voltage

Fault status

⚠️ Status
Climate control relay circuit short to battery (B+). The HVAC control module detected the relay supply/control line tied to battery voltage when it should be switched, storing fault B1294.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.0 hours

Similar codes

B1295 B1289 B1298 P0627 U0121
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