B12CC

Code

LAND ROVER B — Body

Driver's Bank - massage module pump set

Brand: LAND ROVER

Type: B — Body

Views: UK: 18 EN: 21 RU: 13

AI status

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Page language: EN

Causes

Blown fuse or faulty relay supplying the massage pump
Damaged, corroded or disconnected connector(s) at the pump or massage module
Failed massage pump motor or internal valve/actuator
Open/short in wiring harness between pump and control module
Poor ground connection
Software or configuration fault in the massage control module or vehicle network

Symptoms

Driver’s seat massage function does not operate
Intermittent operation of seat massage (works sometimes)
Unusual noise or no noise when massage is commanded
Warning message or icon on the infotainment/vehicle message centre
DTC B12CC stored in module memory

What to check

Read all stored DTCs and freeze-frame data with a Land Rover-capable scan tool
Visually inspect fusion links, fuses and relays related to seat/massage circuits
Inspect connectors at the seat massage pump and massage control module for corrosion, water, damage or loose pins
Check wiring harness for chafing or damage between seat and control module
Confirm battery voltage is healthy (11–14 V) during test attempts
Listen for pump motor operation when massage is commanded (if safe to do so)

Signal parameters

Supply voltage to pump when commanded: ~11–14 V (should be near battery voltage when activated)
Control input: PWM or switched 12 V command from massage control module (present when function selected)
Ground continuity: low ohms to chassis ground from pump ground
Current draw when pump runs: elevated above idle circuit (typical pump currents often range from ~1–5 A depending on design)
No or low voltage on supply/control when inactive

Diagnostic algorithm

Connect a compatible diagnostic tool and record all related DTCs, freeze-frame and live data while attempting to operate the massage function
Confirm vehicle battery voltage is in normal range before tests
Visually inspect fuses and relays for the seat/massage circuit; replace any blown items and re-test
Perform a wiggle test of the seat wiring and connectors while commanding the pump to reproduce fault or intermittent behaviour
Command the massage pump via the diagnostic tool and observe live data: check for command signal and supply voltage at the pump connector
Measure voltage at the pump connector while the function is commanded. If supply voltage present but pump does not run, measure current draw to determine if motor is drawing load or open circuit
If no supply voltage is present, trace back to the relay/fuse and control module output for faults or shorts
Inspect and test ground continuity from pump ground pin to chassis ground
If wiring and power are good but pump does not operate, remove seat and bench-test the pump (apply appropriate fused 12 V and ground) to verify pump motor function
If bench test shows pump OK, inspect/replace massage control module or repair wiring harness as required
Check for any software updates or TSBs from Land Rover that relate to seat massage function, reprogram module if recommended
Clear codes and retest system operation after repairs; verify absence of code return and proper function

Likely causes

Failed pump motor or seized pump
Corroded/loose connector at the pump or module
Blown fuse or defective relay in pump supply circuit
Open/short in the harness to the seat massage module
Control module internal fault or failed module software

Fault status

⚠️ Status

Driver's bank massage module pump set fault — pump or circuit not operating within expected parameters.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.5 hours

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B12CC — Driver's Bank - massage module pump set