B100C

Code

LAND ROVER B — Body

Column Lock Supply Authorization

Brand: LAND ROVER

Type: B — Body

Views: UK: 31 EN: 38 RU: 32

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Blown fuse or open/poor power supply to the column lock
Weak/low vehicle battery or poor battery connections
Faulty steering column lock actuator or motor
Damaged or corroded connector or wiring (open/short to battery or ground)
Faulty Body Control Module (BCM) or immobilizer module
Loss of CAN/LIN communication between modules (authorization message not received)

Symptoms

Steering column remains locked or will not lock/unlock
Engine will not crank or starter inhibited in some conditions
Immobilizer or security warning lamp or message displayed
Key not recognized or intermittent key detection
No response when attempting to lock/unlock column via key or remote
Related electrical anomalies on other body systems (intermittent faults)

What to check

Read stored and pending DTCs with a capable diagnostic scanner; note freeze-frame and vehicle status
Check battery voltage (at rest and during crank); ensure good battery terminals and charging system
Visually inspect fuses and fusible links related to steering column lock and body control
Inspect connectors and wiring at the steering column lock actuator and BCM for corrosion, damage or loose terminals
Scan for CAN/LIN bus errors and lost-communication U-codes
Attempt to operate the column lock with a diagnostic tool while monitoring voltages and communications

Signal parameters

Battery supply to column lock: ~12 V (12.4–12.8 V at rest; >11 V during cranking)
Supply/command line should show 0 V (inactive) / ~12 V (active) when module commands actuator — verify during operation with scan tool
Ground continuity from column lock housing to chassis: near 0 Ω
Actuator current draw when operated: expected transient draw (typically
CAN/LIN network: normal bus voltages (~2.5 V differential midline on CAN; LIN single-wire idle ~12 V pulled low for frames) and no error frames reported

Diagnostic algorithm

Use a diagnostic scanner to read B100C and any related codes; record freeze-frame and attempt an active test/command for column lock.
Check vehicle battery condition and charging; ensure battery state is within specification. Recharge or replace if low.
Inspect and verify all fuses/fusible links for the column lock and BCM; replace any blown fuses and retest.
Visually inspect wiring and connectors at the steering column lock actuator and BCM for damage, corrosion, or poor pin fit; repair as required.
With the permission of the vehicle manufacturer procedure, use a scope/multimeter to measure supply voltage and ground to the column lock while commanding lock/unlock from the scanner. Verify the authorization/command signal is present.
Check module communications (CAN/LIN) and related U-codes (e.g., U0100, U0140). If communications are lost, trace and repair bus wiring and connectors.
Verify immobilizer/key status: check key recognition, antenna ring, and immobilizer module for faults. Try a known-good programmed key if available.
If supply and command messages are present but the actuator does not operate, measure actuator resistance and current draw; replace the actuator if defective.
If wiring and actuator are good and bus communications are correct, consult manufacturer guidance for BCM/immobilizer diagnostics — module reprogramming or replacement may be required.
After repair, clear codes and perform a full system test to confirm correct operation and that code does not return.

Likely causes

Blown fuse or missing battery power to column lock
Immobilizer/BCM not issuing authorization (communication or programming fault)
Wiring/connectors to the column lock actuator are corroded, damaged, or shorted
Faulty steering column lock actuator

Fault status

⚠️ Status

Column lock supply authorization fault — steering column lock not authorized/powered. Check power, wiring, immobilizer/BCM and communications.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

Repair manuals

Manual library for LAND ROVER

413

Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

Your experience will help others

+100 karma for a short comment :)

Was this AI description helpful?

Your feedback helps improve AI descriptions.

👍 Like 0 👎 Dislike 0

Send to email