B1097

Code

LAND ROVER B — Body

Relay of stop warm breeze

Brand: LAND ROVER

Type: B — Body

Views: UK: 20 EN: 30 RU: 23

AI status

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Page language: EN

Causes

Failed HVAC relay (control or load side)
Open or short in relay supply or control wiring
Poor or corroded connector / terminal at relay or HVAC module
Blower motor or related load drawing excessive current
Faulty HVAC control module or body control module
Blown fuse or poor battery supply/ground

Symptoms

HVAC stops supplying warm air in affected mode
Blower or vent operation intermittent or inoperative
HVAC only works in certain fan speeds or modes
DTC B1097 stored in HVAC or body control module
Possible unusual relay noise or no click from relay when commanding HVAC change

What to check

Read and record DTCs and freeze frame data with a diagnostic scanner
Inspect fuses and the HVAC/relay fuse circuit for continuity and correct rating
Visually inspect relay, relay socket and wiring for corrosion, damage or overheating
Swap the suspect relay with a known-good same-type relay (if available) and re-test
Perform voltage and ground checks at the relay socket with HVAC commanded ON
Measure blower motor current draw to ensure it is within specification

Signal parameters

Relay supply: battery voltage ~10–14 V present at relay power terminal with ignition ON
Control signal: HVAC/control module toggles relay coil between ground and supply (0 V / ~12 V) when commanded
Coil resistance: typical automotive relay coil in the range of tens to a few hundred ohms (varies by relay)
Load-side switching: switched output should present battery voltage to blower/actuator when relay energized
Blower motor current: typically several amps (verify against vehicle specification – large draw may indicate motor/actuator fault)

Diagnostic algorithm

Connect a capable OBD diagnostic tool, confirm B1097 and note any related codes and freeze frame conditions.
Attempt to reproduce the fault and listen for relay operation when climate control mode/fan is changed.
Inspect the physical relay, socket and harness for heat damage, corrosion or loose terminals; repair as needed.
Check fuses and supply voltage at the relay power terminal with ignition ON; repair any supply faults.
With ignition and HVAC system commanded ON, probe relay coil terminals: verify control signal toggles and good ground.
If coil control is present but relay does not switch, replace relay and retest.
If relay switches but blower/actuator does not operate, measure load-side voltage and current; inspect blower/actuator and associated wiring for short/open.
If wiring and relay are good but control signal is missing or erratic, suspect and test the HVAC control module / BCM; check for software updates or known technical service bulletins.
After repairs, clear codes, cycle ignition and HVAC modes, and road-test to confirm no recurrence. Re-scan to verify no new codes.

Likely causes

Worn or stuck relay contacts preventing switching
Broken wire or poor connector at relay harness
Weak or missing ground at relay/module
Excessive current draw from blower or actuator causing relay to fail
Intermittent HVAC module output due to module fault

Fault status

⚠️ Status

HVAC relay circuit fault detected for the 'stop warm breeze' function. Control or supply to the relay failed to operate as expected (open, short, stuck relay, or module output fault).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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Repair manuals

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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.

LAND ROVER

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