B1B69

Code

LAND ROVER B — Body

12 volts power circuit

Brand: LAND ROVER

Type: B — Body

Views: UK: 10 EN: 21 RU: 12

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Page language: EN

Causes

Blown fuse or fusible link in the 12V feed
Open or shorted wiring in the 12V supply circuit
Corroded, loose or damaged battery terminal or ground
Poor connector pin contact at the module or junction block
Failed module (internal power regulator or failure to wake)
Battery low or weak, or poor charging system output

Symptoms

One or more body modules inoperative or intermittent
Warning lights on dash (general electrical or module faults)
Modules failing to communicate or ‘no module’ messages
No crank/no start if affected module is related to starter/ECM power
Loss of convenience features (locks, lights, infotainment) tied to that supply

What to check

Check battery state-of-charge and charging system voltage (engine running ~13.5–14.8V)
Inspect relevant fuses and fusible links for continuity and correct rating
Visually inspect wiring harnesses, connectors and grounds for corrosion, damage, or loose pins
Measure voltage at the module 12V supply pin with key off and key on
Check resistance of ground circuit between module ground pin and battery negative
Scan for other stored codes and freeze frame data; note when the fault sets

Signal parameters

Battery resting voltage: ~12.4–12.8 V (fully charged)
Charging system (engine running): ~13.5–14.8 V
Module 12V supply pin: ~battery voltage with key ON and during cranking (>9.6 V)
Ground resistance from module to battery: typically
Fuse continuity: closed (near 0 Ω) with fuse in place
Intermittent dropouts: rapid voltage dips or opens when harness is flexed

Diagnostic algorithm

Record symptoms and read all stored DTCs and freeze frame data with a capable scan tool.
Verify battery voltage and charging system condition. Recharge or replace battery if weak.
Identify the module protected by the B1B69 code and obtain its wiring diagram/pinout.
Inspect fuse(s) and fusible link(s) for the module; replace if blown and retest. If fuse blows again, suspect short to ground.
With connector exposed, measure presence of 12V at the module supply pin with key OFF/ON and while cranking. Compare to battery voltage.
Check continuity between the module supply pin and the fuse/junction box; repair any open circuits.
Measure ground resistance between module ground pin and battery negative; clean/tighten/repair ground as needed.
Inspect and clean connector pins; apply dielectric grease after repairs. Repair corroded pins or replace connector/harness section if necessary.
If supply and ground are good but code persists, swap or bench-test the module if a known-good unit available or consult diagnostic flow for module programming/activation tests.
After repair, clear codes, perform full system function test, and verify code does not return under normal operation and during stress (vibration, door operation, start/stop).

Likely causes

Blown ignition or body fuse supplying the module
High resistance ground at module chassis ground point
Broken or pinched cable between battery/fuse box and module
Water intrusion or corrosion at module connector
Faulty body control module (BCM) or related module power input stage

Fault status

⚠️ Status

12V power circuit to module fault detected — check supply fuse, wiring, ground and module.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-3 hours

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