Code
B2533
HUMMER
B — Body
Front Fog Lamps Control Circuit High (BCM)
Views:
UK: 5
EN: 17
RU: 13
AI status
Completed
Completed
100%
Causes
- Short to battery or constant 12V on the fog lamp output circuit
- Damaged wiring harness or pinched/chewed wires (insulation worn through to battery feed)
- Corroded or damaged connectors at the fog lamp or BCM
- Failed fog lamp bulb or aftermarket lamp assembly causing abnormal load
- Faulty relay or fuse feeding the fog lamp circuit
- Internal BCM output driver fault or BCM software/firmware issue
Symptoms
- Front fog lamps may remain ON or be intermittent
- Fog lamps will not switch off via the dash switch
- Possible blown fuse(s) on related circuit(s)
- Illumination warning or BCM related message on dash (depending on vehicle)
- Other lighting functions controlled by the same module may behave erratically
What to check
- Retrieve all stored codes and freeze-frame data with a scan tool
- Visually inspect fog lamps, connectors, wiring harnesses, and fuses for damage or corrosion
- Check for aftermarket lamps, adapters, or accessories on the fog lamp circuit
- Operate fog lamp switch while observing BCM data for status and outputs
- Inspect relay(s) associated with fog lamps and test/replace if suspect
Signal parameters
- Expected control behavior: BCM is typically a low-side or switched output; when OFF circuit voltage at lamp should be near 0–1 V (relative to ground)
- When ON the lamp circuit typically measures battery voltage ~11–14 V at the lamp connector (lamp connected)
- Fault condition indicated when control circuit measures an elevated or constant battery feed on the BCM output when it should be low (e.g., >14.5 V or presence of battery voltage in OFF state)
- Continuity/Resistance: low resistance between BCM output and lamp when connected (depends on lamp load) and near-infinite to battery feed when circuit is open/isolated
Diagnostic algorithm
- Record code(s) and associated freeze-frame/vehicle data, then clear codes and retest to confirm repeatability.
- Visually inspect wiring, connectors, lamp sockets, and fuses for damage, corrosion, or evidence of aftermarket splicing.
- With ignition ON and fog lamp OFF, backprobe the BCM fog lamp output and measure voltage relative to ground. Expected: ~0 V when OFF. If battery voltage present, suspect short to battery or a stuck relay.
- Operate fog lamp ON while monitoring voltage and switch status with a scan tool. Confirm BCM command matches switch input and that voltage rises only when commanded.
- Disconnect fog lamp connector(s) at the lamp(s). If the high-voltage code clears with lamp(s) disconnected, suspect lamp assembly, socket, or wiring downstream.
- Inspect and test any fog lamp relay(s) and related feed circuits for a stuck contact or incorrect constant feed. Remove/replace relay to verify behavior.
- Check for unintended feeds: measure continuity between fog lamp output and battery feed circuits/ignition feeds to locate short or improper splice.
- Inspect grounding points for the fog lamp circuit; ensure good ground integrity and continuity to chassis.
- If wiring and external components test good, test or swap BCM output (where allowed by manufacturer procedures) or perform BCM bench/programming checks per factory service information.
- Only replace BCM after eliminating external causes; follow security/reprogramming procedures if BCM replacement is required.
Likely causes
- Short to battery at lamp connector or inline splice
- Corrosion or bent pins at BCM connector allowing abnormal voltage reading
- Faulty fog lamp relay stuck closed or relay control wiring tied to constant power
- Aftermarket LED bulbs or wiring adapter causing different electrical characteristics and pulling voltage high on the driver
- Open or damaged ground for the fog lamp circuit causing the BCM driver to see a high voltage condition
Fault status
Status
BCM detected abnormally high voltage on front fog lamp control circuit (possible short to battery or driver fault).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
HTML Workshop Manuals AI manual library for HUMMER Click to show available manuals 8
HUMMER 2010 Hummer H3 Alpha
HTML ManualHUMMER 2010 Hummer H3 Base
HTML ManualHUMMER 2010 Hummer H3 Base
HTML ManualHUMMER 2010 Hummer H3 L5-3 3.7L
HTML ManualHUMMER 2010 Hummer H3 V8-5 V8-5.3L
HTML ManualHUMMER 2010 Hummer H3T Alpha
HTML ManualHUMMER 2010 Hummer H3T Base
HTML ManualHUMMER 2010 Hummer H3T Base
HTML ManualYour 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
Code
B2533
HYUNDAI
B — Body
Assistant Door Courtesy Lamp Error
Views:
UK: 11
EN: 26
RU: 16
AI status
Completed
Completed
100%
Causes
- Short to battery or constant 12V on the fog lamp output circuit
- Damaged wiring harness or pinched/chewed wires (insulation worn through to battery feed)
- Corroded or damaged connectors at the fog lamp or BCM
- Failed fog lamp bulb or aftermarket lamp assembly causing abnormal load
- Faulty relay or fuse feeding the fog lamp circuit
- Internal BCM output driver fault or BCM software/firmware issue
Symptoms
- Front fog lamps may remain ON or be intermittent
- Fog lamps will not switch off via the dash switch
- Possible blown fuse(s) on related circuit(s)
- Illumination warning or BCM related message on dash (depending on vehicle)
- Other lighting functions controlled by the same module may behave erratically
What to check
- Retrieve all stored codes and freeze-frame data with a scan tool
- Visually inspect fog lamps, connectors, wiring harnesses, and fuses for damage or corrosion
- Check for aftermarket lamps, adapters, or accessories on the fog lamp circuit
- Operate fog lamp switch while observing BCM data for status and outputs
- Inspect relay(s) associated with fog lamps and test/replace if suspect
Signal parameters
- Expected control behavior: BCM is typically a low-side or switched output; when OFF circuit voltage at lamp should be near 0–1 V (relative to ground)
- When ON the lamp circuit typically measures battery voltage ~11–14 V at the lamp connector (lamp connected)
- Fault condition indicated when control circuit measures an elevated or constant battery feed on the BCM output when it should be low (e.g., >14.5 V or presence of battery voltage in OFF state)
- Continuity/Resistance: low resistance between BCM output and lamp when connected (depends on lamp load) and near-infinite to battery feed when circuit is open/isolated
Diagnostic algorithm
- Record code(s) and associated freeze-frame/vehicle data, then clear codes and retest to confirm repeatability.
- Visually inspect wiring, connectors, lamp sockets, and fuses for damage, corrosion, or evidence of aftermarket splicing.
- With ignition ON and fog lamp OFF, backprobe the BCM fog lamp output and measure voltage relative to ground. Expected: ~0 V when OFF. If battery voltage present, suspect short to battery or a stuck relay.
- Operate fog lamp ON while monitoring voltage and switch status with a scan tool. Confirm BCM command matches switch input and that voltage rises only when commanded.
- Disconnect fog lamp connector(s) at the lamp(s). If the high-voltage code clears with lamp(s) disconnected, suspect lamp assembly, socket, or wiring downstream.
- Inspect and test any fog lamp relay(s) and related feed circuits for a stuck contact or incorrect constant feed. Remove/replace relay to verify behavior.
- Check for unintended feeds: measure continuity between fog lamp output and battery feed circuits/ignition feeds to locate short or improper splice.
- Inspect grounding points for the fog lamp circuit; ensure good ground integrity and continuity to chassis.
- If wiring and external components test good, test or swap BCM output (where allowed by manufacturer procedures) or perform BCM bench/programming checks per factory service information.
- Only replace BCM after eliminating external causes; follow security/reprogramming procedures if BCM replacement is required.
Likely causes
- Short to battery at lamp connector or inline splice
- Corrosion or bent pins at BCM connector allowing abnormal voltage reading
- Faulty fog lamp relay stuck closed or relay control wiring tied to constant power
- Aftermarket LED bulbs or wiring adapter causing different electrical characteristics and pulling voltage high on the driver
- Open or damaged ground for the fog lamp circuit causing the BCM driver to see a high voltage condition
Fault status
Status
BCM detected abnormally high voltage on front fog lamp control circuit (possible short to battery or driver fault).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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
Code
B2533
LAND ROVER
B — Body
Rear light - circuit failure
Views:
UK: 5
EN: 16
RU: 9
AI status
Completed
Completed
100%
Causes
- Short to battery or constant 12V on the fog lamp output circuit
- Damaged wiring harness or pinched/chewed wires (insulation worn through to battery feed)
- Corroded or damaged connectors at the fog lamp or BCM
- Failed fog lamp bulb or aftermarket lamp assembly causing abnormal load
- Faulty relay or fuse feeding the fog lamp circuit
- Internal BCM output driver fault or BCM software/firmware issue
Symptoms
- Front fog lamps may remain ON or be intermittent
- Fog lamps will not switch off via the dash switch
- Possible blown fuse(s) on related circuit(s)
- Illumination warning or BCM related message on dash (depending on vehicle)
- Other lighting functions controlled by the same module may behave erratically
What to check
- Retrieve all stored codes and freeze-frame data with a scan tool
- Visually inspect fog lamps, connectors, wiring harnesses, and fuses for damage or corrosion
- Check for aftermarket lamps, adapters, or accessories on the fog lamp circuit
- Operate fog lamp switch while observing BCM data for status and outputs
- Inspect relay(s) associated with fog lamps and test/replace if suspect
Signal parameters
- Expected control behavior: BCM is typically a low-side or switched output; when OFF circuit voltage at lamp should be near 0–1 V (relative to ground)
- When ON the lamp circuit typically measures battery voltage ~11–14 V at the lamp connector (lamp connected)
- Fault condition indicated when control circuit measures an elevated or constant battery feed on the BCM output when it should be low (e.g., >14.5 V or presence of battery voltage in OFF state)
- Continuity/Resistance: low resistance between BCM output and lamp when connected (depends on lamp load) and near-infinite to battery feed when circuit is open/isolated
Diagnostic algorithm
- Record code(s) and associated freeze-frame/vehicle data, then clear codes and retest to confirm repeatability.
- Visually inspect wiring, connectors, lamp sockets, and fuses for damage, corrosion, or evidence of aftermarket splicing.
- With ignition ON and fog lamp OFF, backprobe the BCM fog lamp output and measure voltage relative to ground. Expected: ~0 V when OFF. If battery voltage present, suspect short to battery or a stuck relay.
- Operate fog lamp ON while monitoring voltage and switch status with a scan tool. Confirm BCM command matches switch input and that voltage rises only when commanded.
- Disconnect fog lamp connector(s) at the lamp(s). If the high-voltage code clears with lamp(s) disconnected, suspect lamp assembly, socket, or wiring downstream.
- Inspect and test any fog lamp relay(s) and related feed circuits for a stuck contact or incorrect constant feed. Remove/replace relay to verify behavior.
- Check for unintended feeds: measure continuity between fog lamp output and battery feed circuits/ignition feeds to locate short or improper splice.
- Inspect grounding points for the fog lamp circuit; ensure good ground integrity and continuity to chassis.
- If wiring and external components test good, test or swap BCM output (where allowed by manufacturer procedures) or perform BCM bench/programming checks per factory service information.
- Only replace BCM after eliminating external causes; follow security/reprogramming procedures if BCM replacement is required.
Likely causes
- Short to battery at lamp connector or inline splice
- Corrosion or bent pins at BCM connector allowing abnormal voltage reading
- Faulty fog lamp relay stuck closed or relay control wiring tied to constant power
- Aftermarket LED bulbs or wiring adapter causing different electrical characteristics and pulling voltage high on the driver
- Open or damaged ground for the fog lamp circuit causing the BCM driver to see a high voltage condition
Fault status
Status
BCM detected abnormally high voltage on front fog lamp control circuit (possible short to battery or driver fault).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
HTML Workshop Manuals AI manual library for LAND ROVER Click to show available manuals 39
LAND ROVER 2018 Discovery HSE Luxury, 3.0L Eng VIN K
HTML ManualLAND ROVER 2018 Discovery HSE Luxury, 3.0L Eng VIN V
HTML ManualLAND ROVER 2018 Discovery HSE, 3.0L Eng VIN K
HTML ManualLAND ROVER 2018 Discovery HSE, 3.0L Eng VIN V
HTML ManualLAND ROVER 2018 Discovery Sport HSE
HTML ManualLAND ROVER 2018 Discovery Sport HSE Luxury
HTML ManualLAND ROVER 2018 Discovery Sport SE
HTML ManualLAND ROVER 2018 Range Rover Autobiography
HTML ManualWorkshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
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
Code
B2533
Other
B — Body
Right Rear Stop lamp Circuit Failure
Views:
UK: 15
EN: 29
RU: 18
AI status
Completed
Completed
100%
Causes
- Short to battery or constant 12V on the fog lamp output circuit
- Damaged wiring harness or pinched/chewed wires (insulation worn through to battery feed)
- Corroded or damaged connectors at the fog lamp or BCM
- Failed fog lamp bulb or aftermarket lamp assembly causing abnormal load
- Faulty relay or fuse feeding the fog lamp circuit
- Internal BCM output driver fault or BCM software/firmware issue
Symptoms
- Front fog lamps may remain ON or be intermittent
- Fog lamps will not switch off via the dash switch
- Possible blown fuse(s) on related circuit(s)
- Illumination warning or BCM related message on dash (depending on vehicle)
- Other lighting functions controlled by the same module may behave erratically
What to check
- Retrieve all stored codes and freeze-frame data with a scan tool
- Visually inspect fog lamps, connectors, wiring harnesses, and fuses for damage or corrosion
- Check for aftermarket lamps, adapters, or accessories on the fog lamp circuit
- Operate fog lamp switch while observing BCM data for status and outputs
- Inspect relay(s) associated with fog lamps and test/replace if suspect
Signal parameters
- Expected control behavior: BCM is typically a low-side or switched output; when OFF circuit voltage at lamp should be near 0–1 V (relative to ground)
- When ON the lamp circuit typically measures battery voltage ~11–14 V at the lamp connector (lamp connected)
- Fault condition indicated when control circuit measures an elevated or constant battery feed on the BCM output when it should be low (e.g., >14.5 V or presence of battery voltage in OFF state)
- Continuity/Resistance: low resistance between BCM output and lamp when connected (depends on lamp load) and near-infinite to battery feed when circuit is open/isolated
Diagnostic algorithm
- Record code(s) and associated freeze-frame/vehicle data, then clear codes and retest to confirm repeatability.
- Visually inspect wiring, connectors, lamp sockets, and fuses for damage, corrosion, or evidence of aftermarket splicing.
- With ignition ON and fog lamp OFF, backprobe the BCM fog lamp output and measure voltage relative to ground. Expected: ~0 V when OFF. If battery voltage present, suspect short to battery or a stuck relay.
- Operate fog lamp ON while monitoring voltage and switch status with a scan tool. Confirm BCM command matches switch input and that voltage rises only when commanded.
- Disconnect fog lamp connector(s) at the lamp(s). If the high-voltage code clears with lamp(s) disconnected, suspect lamp assembly, socket, or wiring downstream.
- Inspect and test any fog lamp relay(s) and related feed circuits for a stuck contact or incorrect constant feed. Remove/replace relay to verify behavior.
- Check for unintended feeds: measure continuity between fog lamp output and battery feed circuits/ignition feeds to locate short or improper splice.
- Inspect grounding points for the fog lamp circuit; ensure good ground integrity and continuity to chassis.
- If wiring and external components test good, test or swap BCM output (where allowed by manufacturer procedures) or perform BCM bench/programming checks per factory service information.
- Only replace BCM after eliminating external causes; follow security/reprogramming procedures if BCM replacement is required.
Likely causes
- Short to battery at lamp connector or inline splice
- Corrosion or bent pins at BCM connector allowing abnormal voltage reading
- Faulty fog lamp relay stuck closed or relay control wiring tied to constant power
- Aftermarket LED bulbs or wiring adapter causing different electrical characteristics and pulling voltage high on the driver
- Open or damaged ground for the fog lamp circuit causing the BCM driver to see a high voltage condition
Fault status
Status
BCM detected abnormally high voltage on front fog lamp control circuit (possible short to battery or driver fault).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Workshop Manuals
Available brands with manuals
2
AUDI 11
6-speed manual gearbox 0B1, front-wheel drive — Workshop Manual (Edition 05.2014)
Workshop Manual199,00 UAH
Audi A3 (1997) – 1.6L 4-cylinder (2‑valve) Engine Mechanical Components Service Manual (AEH, AKL, APF) – Edition 07.2002
Workshop Manual199,00 UAH
AUDI A3 (2004) Workshop Manual — 2.0L FSI Turbo (4‑cyl, 4‑valve) Engine, Mechanics — Edition 03.2017
Workshop Manual199,00 UAH
Audi A3 2004 — Electrical System (Workshop Manual, Edition 02.2018)
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet – 4.2 l V8 (5‑valve, timing chains) – Workshop Manual (Mechanics) – Edition 04.2007
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet — Auxiliary Heater Workshop Manual (Edition 08.2004)
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet (1.8T 4‑cyl turbo) — Motronic Injection & Ignition System Service Manual (Edition 01.2015)
Workshop Manual199,00 UAH
Audi A8 (2003) — Electrical System Workshop Manual (Edition 08.2014)
Workshop Manual199,00 UAH
Audi Q4 e-tron (Type F4) - Self-study Programme SSP 685
Workshop Manual199,00 UAH
Audi Q8 (2018) — Electrical System Workshop Manual (Edition 05.2019)
Workshop Manual199,00 UAH
Audi Servicing Manual — 7‑Speed Dual Clutch Transmission 0CJ / 0CL / 0CK / 0DN / 0DP / 0HL (Edition 05.2018)
Workshop Manual199,00 UAH
LAND ROVER 3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
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