Code
C1224
Generic
C — Chassis
Lamp Brake Warning Output Circuit Open
Views:
UK: 16
EN: 39
RU: 26
AI status
Completed
Completed
100%
Causes
- Open or broken wiring between module and brake lamp / warning lamp
- Disconnected, corroded or damaged connector at lamp or module
- Burned-out brake light bulb or lamp filament open
- Blown fuse protecting the lamp/output circuit
- Failed ground connection for lamp circuit
- Faulty body control module / ABS module output transistor or driver
Symptoms
- Brake warning lamp (or brake lights) does not illuminate when pedal pressed
- Brake warning or ABS indicator illuminated on dash
- Intermittent or no brake light function
- Possible loss of related functions that depend on the warning output (varies by vehicle)
What to check
- Scan for C1224 and any related codes; record freeze frame and clear then re-test
- Visually inspect rear lamp assemblies, sockets and harness for damage or corrosion
- Check fuses and fusible links for the brake lamp / dash warning circuit
- Operate brake pedal while observing lamp and wiggle harness/connectors for intermittent faults
- Measure voltage at lamp socket with pedal pressed and key on
- Perform continuity check from module output pin to lamp connector and check ground continuity
Signal parameters
- Battery nominal voltage: 11–14.5 V (engine running ~13.5–14.5 V)
- Expected voltage at lamp positive terminal with pedal pressed: battery voltage (~11–14 V)
- Expected resistance continuity from module output pin to lamp positive terminal: low (typically
- Ground continuity from lamp negative to chassis: near 0 ohms (usually
- Open-circuit indication: no voltage at lamp with module commanded ON, continuity check shows infinite resistance
Diagnostic algorithm
- Retrieve DTC C1224 and related codes. Note freeze frame data. Clear codes and attempt to reproduce.
- Visually inspect rear/center brake lamp assemblies, sockets, and connectors for corrosion, water intrusion or damage. Replace corroded components.
- Check fuse(s) for brake lamp / warning circuit. Replace any blown fuse and retest.
- With help operating the brake pedal, confirm lamp operation. If lamp does not illuminate, remove bulb and test bulb on a known good 12 V source to confirm filament continuity.
- Probe the lamp socket with a multimeter while brake is applied: verify battery voltage on the feed, and verify ground. If no voltage, trace back toward module.
- Disconnect connector at module (with power off) and measure continuity from module output pin to lamp socket. If open, repair or replace wiring/harness between the module and lamp.
- Check ground path continuity from lamp negative to chassis and to module ground. Repair any poor grounds.
- If wiring, connectors, fuses and lamp are good but no output voltage when commanded, verify module outputs using a test lamp or oscilloscope per manufacturer procedure. If module output is confirmed faulty, replace module or follow manufacturer repair instructions.
- After repairs, clear codes, operate system to confirm lamp function, and perform a road or function test to ensure the code does not return.
Likely causes
- Blown bulb or lamp filament open
- Damaged connector or corroded pins at lamp socket
- Open wiring/harness (chafed, pinched, or broken conductor)
- Blown fuse in brake lamp circuit
- Failed module output if wiring and lamp check good
Fault status
Status
Open circuit detected on Brake Warning Lamp Output (C1224). The brake warning/brake lamp output cannot be driven due to loss of continuity; inspect lamp, fuse, wiring, and module.
Repair difficulty: Medium
Diagnostic time: 0.5-1.5 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
Code
C1224
HUMMER
C — Chassis
Right Rear Wheel Speed Sensor Input Signal is 0
Views:
UK: 9
EN: 27
RU: 13
AI status
Completed
Completed
100%
Causes
- Open or broken wiring between module and brake lamp / warning lamp
- Disconnected, corroded or damaged connector at lamp or module
- Burned-out brake light bulb or lamp filament open
- Blown fuse protecting the lamp/output circuit
- Failed ground connection for lamp circuit
- Faulty body control module / ABS module output transistor or driver
Symptoms
- Brake warning lamp (or brake lights) does not illuminate when pedal pressed
- Brake warning or ABS indicator illuminated on dash
- Intermittent or no brake light function
- Possible loss of related functions that depend on the warning output (varies by vehicle)
What to check
- Scan for C1224 and any related codes; record freeze frame and clear then re-test
- Visually inspect rear lamp assemblies, sockets and harness for damage or corrosion
- Check fuses and fusible links for the brake lamp / dash warning circuit
- Operate brake pedal while observing lamp and wiggle harness/connectors for intermittent faults
- Measure voltage at lamp socket with pedal pressed and key on
- Perform continuity check from module output pin to lamp connector and check ground continuity
Signal parameters
- Battery nominal voltage: 11–14.5 V (engine running ~13.5–14.5 V)
- Expected voltage at lamp positive terminal with pedal pressed: battery voltage (~11–14 V)
- Expected resistance continuity from module output pin to lamp positive terminal: low (typically
- Ground continuity from lamp negative to chassis: near 0 ohms (usually
- Open-circuit indication: no voltage at lamp with module commanded ON, continuity check shows infinite resistance
Diagnostic algorithm
- Retrieve DTC C1224 and related codes. Note freeze frame data. Clear codes and attempt to reproduce.
- Visually inspect rear/center brake lamp assemblies, sockets, and connectors for corrosion, water intrusion or damage. Replace corroded components.
- Check fuse(s) for brake lamp / warning circuit. Replace any blown fuse and retest.
- With help operating the brake pedal, confirm lamp operation. If lamp does not illuminate, remove bulb and test bulb on a known good 12 V source to confirm filament continuity.
- Probe the lamp socket with a multimeter while brake is applied: verify battery voltage on the feed, and verify ground. If no voltage, trace back toward module.
- Disconnect connector at module (with power off) and measure continuity from module output pin to lamp socket. If open, repair or replace wiring/harness between the module and lamp.
- Check ground path continuity from lamp negative to chassis and to module ground. Repair any poor grounds.
- If wiring, connectors, fuses and lamp are good but no output voltage when commanded, verify module outputs using a test lamp or oscilloscope per manufacturer procedure. If module output is confirmed faulty, replace module or follow manufacturer repair instructions.
- After repairs, clear codes, operate system to confirm lamp function, and perform a road or function test to ensure the code does not return.
Likely causes
- Blown bulb or lamp filament open
- Damaged connector or corroded pins at lamp socket
- Open wiring/harness (chafed, pinched, or broken conductor)
- Blown fuse in brake lamp circuit
- Failed module output if wiring and lamp check good
Fault status
Status
Open circuit detected on Brake Warning Lamp Output (C1224). The brake warning/brake lamp output cannot be driven due to loss of continuity; inspect lamp, fuse, wiring, and module.
Repair difficulty: Medium
Diagnostic time: 0.5-1.5 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
C1224
HYUNDAI
C — Chassis
ASC Potentiometer - Abnormal
Views:
UK: 12
EN: 29
RU: 19
AI status
Completed
Completed
100%
Causes
- Open or broken wiring between module and brake lamp / warning lamp
- Disconnected, corroded or damaged connector at lamp or module
- Burned-out brake light bulb or lamp filament open
- Blown fuse protecting the lamp/output circuit
- Failed ground connection for lamp circuit
- Faulty body control module / ABS module output transistor or driver
Symptoms
- Brake warning lamp (or brake lights) does not illuminate when pedal pressed
- Brake warning or ABS indicator illuminated on dash
- Intermittent or no brake light function
- Possible loss of related functions that depend on the warning output (varies by vehicle)
What to check
- Scan for C1224 and any related codes; record freeze frame and clear then re-test
- Visually inspect rear lamp assemblies, sockets and harness for damage or corrosion
- Check fuses and fusible links for the brake lamp / dash warning circuit
- Operate brake pedal while observing lamp and wiggle harness/connectors for intermittent faults
- Measure voltage at lamp socket with pedal pressed and key on
- Perform continuity check from module output pin to lamp connector and check ground continuity
Signal parameters
- Battery nominal voltage: 11–14.5 V (engine running ~13.5–14.5 V)
- Expected voltage at lamp positive terminal with pedal pressed: battery voltage (~11–14 V)
- Expected resistance continuity from module output pin to lamp positive terminal: low (typically
- Ground continuity from lamp negative to chassis: near 0 ohms (usually
- Open-circuit indication: no voltage at lamp with module commanded ON, continuity check shows infinite resistance
Diagnostic algorithm
- Retrieve DTC C1224 and related codes. Note freeze frame data. Clear codes and attempt to reproduce.
- Visually inspect rear/center brake lamp assemblies, sockets, and connectors for corrosion, water intrusion or damage. Replace corroded components.
- Check fuse(s) for brake lamp / warning circuit. Replace any blown fuse and retest.
- With help operating the brake pedal, confirm lamp operation. If lamp does not illuminate, remove bulb and test bulb on a known good 12 V source to confirm filament continuity.
- Probe the lamp socket with a multimeter while brake is applied: verify battery voltage on the feed, and verify ground. If no voltage, trace back toward module.
- Disconnect connector at module (with power off) and measure continuity from module output pin to lamp socket. If open, repair or replace wiring/harness between the module and lamp.
- Check ground path continuity from lamp negative to chassis and to module ground. Repair any poor grounds.
- If wiring, connectors, fuses and lamp are good but no output voltage when commanded, verify module outputs using a test lamp or oscilloscope per manufacturer procedure. If module output is confirmed faulty, replace module or follow manufacturer repair instructions.
- After repairs, clear codes, operate system to confirm lamp function, and perform a road or function test to ensure the code does not return.
Likely causes
- Blown bulb or lamp filament open
- Damaged connector or corroded pins at lamp socket
- Open wiring/harness (chafed, pinched, or broken conductor)
- Blown fuse in brake lamp circuit
- Failed module output if wiring and lamp check good
Fault status
Status
Open circuit detected on Brake Warning Lamp Output (C1224). The brake warning/brake lamp output cannot be driven due to loss of continuity; inspect lamp, fuse, wiring, and module.
Repair difficulty: Medium
Diagnostic time: 0.5-1.5 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
C1224
Other
C — Chassis
Lamp Brake Warning Output Circuit Open
Views:
UK: 16
EN: 38
RU: 29
AI status
Completed
Completed
100%
Causes
- Open or broken wiring between module and brake lamp / warning lamp
- Disconnected, corroded or damaged connector at lamp or module
- Burned-out brake light bulb or lamp filament open
- Blown fuse protecting the lamp/output circuit
- Failed ground connection for lamp circuit
- Faulty body control module / ABS module output transistor or driver
Symptoms
- Brake warning lamp (or brake lights) does not illuminate when pedal pressed
- Brake warning or ABS indicator illuminated on dash
- Intermittent or no brake light function
- Possible loss of related functions that depend on the warning output (varies by vehicle)
What to check
- Scan for C1224 and any related codes; record freeze frame and clear then re-test
- Visually inspect rear lamp assemblies, sockets and harness for damage or corrosion
- Check fuses and fusible links for the brake lamp / dash warning circuit
- Operate brake pedal while observing lamp and wiggle harness/connectors for intermittent faults
- Measure voltage at lamp socket with pedal pressed and key on
- Perform continuity check from module output pin to lamp connector and check ground continuity
Signal parameters
- Battery nominal voltage: 11–14.5 V (engine running ~13.5–14.5 V)
- Expected voltage at lamp positive terminal with pedal pressed: battery voltage (~11–14 V)
- Expected resistance continuity from module output pin to lamp positive terminal: low (typically
- Ground continuity from lamp negative to chassis: near 0 ohms (usually
- Open-circuit indication: no voltage at lamp with module commanded ON, continuity check shows infinite resistance
Diagnostic algorithm
- Retrieve DTC C1224 and related codes. Note freeze frame data. Clear codes and attempt to reproduce.
- Visually inspect rear/center brake lamp assemblies, sockets, and connectors for corrosion, water intrusion or damage. Replace corroded components.
- Check fuse(s) for brake lamp / warning circuit. Replace any blown fuse and retest.
- With help operating the brake pedal, confirm lamp operation. If lamp does not illuminate, remove bulb and test bulb on a known good 12 V source to confirm filament continuity.
- Probe the lamp socket with a multimeter while brake is applied: verify battery voltage on the feed, and verify ground. If no voltage, trace back toward module.
- Disconnect connector at module (with power off) and measure continuity from module output pin to lamp socket. If open, repair or replace wiring/harness between the module and lamp.
- Check ground path continuity from lamp negative to chassis and to module ground. Repair any poor grounds.
- If wiring, connectors, fuses and lamp are good but no output voltage when commanded, verify module outputs using a test lamp or oscilloscope per manufacturer procedure. If module output is confirmed faulty, replace module or follow manufacturer repair instructions.
- After repairs, clear codes, operate system to confirm lamp function, and perform a road or function test to ensure the code does not return.
Likely causes
- Blown bulb or lamp filament open
- Damaged connector or corroded pins at lamp socket
- Open wiring/harness (chafed, pinched, or broken conductor)
- Blown fuse in brake lamp circuit
- Failed module output if wiring and lamp check good
Fault status
Status
Open circuit detected on Brake Warning Lamp Output (C1224). The brake warning/brake lamp output cannot be driven due to loss of continuity; inspect lamp, fuse, wiring, and module.
Repair difficulty: Medium
Diagnostic time: 0.5-1.5 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
