B135B

Code

LAND ROVER B — Body

Left rear - Foot shock absorber motor Right rear - Face shock absorber motor foot damper

Brand: LAND ROVER

Type: B — Body

Views: UK: 12 EN: 18 RU: 15

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Page language: EN

Causes

Open or short in actuator wiring harness or connector
Corroded, loose or water‑ingressed connector pins
Failed shock absorber motor or damper actuator assembly
Mechanical seizure or binding of the damper mechanism
Poor ground or insufficient battery supply voltage
Blown fuse, faulty relay or power distribution fault

Symptoms

Suspension warning/service message on dash and/or fault indicator
Vehicle may fail to change ride height or damping mode for affected corner(s)
Uneven ride height or poor ride quality at rear
Noise (grinding/whine) from rear shock area on command or during travel
DTC(s) stored in suspension/BCM/SCM memory related to actuator circuits
Possible limp mode or limited suspension functionality

What to check

Read all stored and pending codes with a compatible diagnostic tool and record freeze frame data
Visual inspection of left and right rear damper harnesses and connectors for corrosion, water ingress, damage or loose pins
Check related fuses and relays for continuity and correct operation
With ignition ON, measure battery supply voltage at the actuator connector and check for a good ground
Use a diagnostic scanner to command the actuators and observe response; listen for motor operation
Perform a wiggle test on harness while commanding actuator to reproduce fault

Signal parameters

Actuator supply voltage: nominal battery voltage (approx. 11–14 V) at connector with ignition ON (typical)
Control signal: module may use PWM drive — frequency can vary by model (often tens to a few hundred Hz)
Motor/actuator resistance: typically low (a few ohms) — expected actual values vary by design (measure and compare left vs right)
Actuator current: idle/command current should be significantly different from a stalled motor (stall current will be much higher)
Feedback: if present, position or hall sensor output typically 0–5 V or digital position counts (refer to manufacturer data)
Note: exact values vary by model/year; use OEM service data where available.

Diagnostic algorithm

Connect a diagnostic scanner to read full suspension module data and confirm B135B plus any related codes; document freeze frame and live data.
Visually inspect both rear damper assemblies, harnesses and connectors for damage, corrosion or water entry. Repair or replace damaged connectors/wiring as required.
Check related fuses/relays and battery voltage. Repair any power distribution faults.
With ignition ON, backprobe the actuator power and ground pins. Verify ~11–14 V supply and a good ground. If supply or ground missing, trace wiring to source.
Use the diagnostic tool to command each rear actuator independently while observing movement, listening for motor noise and watching live current draw and any feedback values. Note differences between left and right.
If actuator does not respond electrically but supply is present, measure motor resistance. An open or shorted motor indicates replacement.
If motor draws excessive current or stalls, inspect for mechanical binding at the damper (remove/inspect mounting if necessary). Repair or replace damper if seized.
If wiring, supply and actuator check OK but control signals are absent or incorrect, investigate suspension control module outputs and grounds. Consider reprogramming or module substitution per OEM procedures.
After repair, clear codes, perform actuator adaptation/calibration if required and verify correct operation in all suspension modes and on road test.
If intermittent, perform extended road test with diagnostics connected to capture transient behaviour.

Likely causes

Corroded/poor connector or wiring to the rear actuator
Failed motor/actuator on left rear foot or right rear face damper
Mechanical binding of the damper preventing movement
Loss of power or ground to actuator circuit
Control module output/sensor fault (less likely)

Fault status

⚠️ Status

Suspension actuator circuit fault detected — left rear foot shock absorber motor and right rear face shock absorber motor/foot damper are reporting abnormal electrical or mechanical behaviour (open/short/high current/no response). Further inspection of wiring, connectors and actuators required.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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B135B — Left rear - Foot shock absorber motor Right rear - Face shock absorber motor foot damper