B1148

Code

LAND ROVER B — Body

Front fog lights right

Brand: LAND ROVER

Type: B — Body

Views: UK: 35 EN: 49 RU: 41

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Burnt or failed fog lamp bulb
Open or shorted wiring in the fog lamp circuit
Corroded or loose connector at the lamp or wiring harness
Bad ground connection at the lamp or body control module
Faulty lamp relay or fuse
Faulty body control module (BCM) or lighting module

Symptoms

Right front fog lamp does not illuminate when switched on
Instrument cluster or message center shows a fog lamp fault or warning
Intermittent operation or flicker of the right fog lamp
Loss of lamp function only on one side (asymmetric lighting)
Possible related faults stored in BCM (communication or lamp circuit)

What to check

Scan vehicle with a compatible diagnostic tool; read/record all related DTCs and live data
Visually inspect the right fog lamp assembly for damage, water ingress, or burnt bulb
Check corresponding fuse(s) and relay(s) for continuity and proper operation
Inspect connectors for corrosion, bent pins or loose terminals
Measure supply voltage at the lamp connector with fog lights ON (~12V or module-switched voltage)
Check continuity and resistance between lamp connector and BCM (with battery disconnected where appropriate)

Signal parameters

Supply voltage at lamp connector: approx. 11–14 V when fog lights ON (may be switched/pulsed by module)
Bulb resistance (approximate): 2–8 Ω for typical 12V single-filament fog bulb (varies by bulb type)
Expected current draw: roughly 1–5 A per fog lamp (depends on bulb wattage)
Ground resistance target:
No communication errors on CAN network related to BCM when tested

Diagnostic algorithm

Connect diagnostic scanner, record B1148 and any related codes, note freeze frame/live data.
Turn fog lights ON and confirm symptom. Attempt to operate from switch and from any steering/wheel controls.
Perform a visual inspection of the right fog lamp, socket and wiring for damage or corrosion; replace bulb if visibly damaged.
Check fuse(s) and relay(s) for the fog lamp circuit; replace or swap with known-good if uncertain.
With fog lights ON, measure voltage at the lamp connector: if no voltage, trace back toward relay/BCM to find where supply stops.
If voltage present but lamp does not light, test lamp by substituting with a known-good bulb or bench-test lamp assembly.
If lamp and connector appear good but intermittent or no operation, check continuity to BCM and inspect ground. Repair any open or high-resistance connections.
If wiring and lamp are good and control signals from the BCM are absent or incorrect, inspect BCM/lighting module and CAN communication. Reprogram or replace module only after confirming wiring and power/ground are good.
Clear codes and re-test operation. Monitor for return of B1148 and address any additional stored codes as required.

Likely causes

Failed bulb or connector corrosion
Open circuit or poor ground in lamp wiring
Blown fuse or faulty relay
Fault in BCM/light module or its programming

Fault status

⚠️ Status

Front fog light (right) circuit fault detected

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 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

B1148 — Front fog lights right