Code
C1920
LAND ROVER
C — Chassis
LED 1 - circuit failure
Views:
UK: 9
EN: 9
RU: 6
AI status
Completed
Completed
100%
Causes
- Open circuit in LED 1 wiring (broken wire, disconnected connector)
- Short to ground or short to battery in LED 1 wiring
- Corroded, loose or water-damaged connector/contacts at the lamp
- Failed LED lamp or internal LED driver/module
- Blown fuse or poor ground at lamp or module
- Faulty body/control module output or software issue
Symptoms
- LED 1 (lamp or segment) fails to illuminate
- Intermittent operation or flickering of the LED
- Illumination warning or lamp malfunction message displayed on dash
- Multiple LED lighting functions affected if shared circuit or control module
- Possible increased current draw or blown fuse
What to check
- Use a diagnostic scan tool to read fault details, freeze frame and occurrence count and attempt to actuate LED 1 from the tool
- Visually inspect the lamp assembly, connector and wiring for damage, corrosion, water ingress or loose pins
- Verify fuses and related power/ground distribution for the lamp circuit
- With lamp disconnected, check continuity between the lamp connector and the control module connector (look for opens/shorts)
- Measure battery voltage at the lamp connector with lamp commanded ON and OFF
- Measure resistance/current of the LED module if accessible (compare to specification)
Signal parameters
- Supply voltage at lamp connector: ~11–14 V when ON (battery voltage range)
- Command signal: PWM duty cycle 0–100% when dimming is used (frequency depends on vehicle design)
- Typical LED module current: usually under 1 A for a single LED string (manufacturer-specific)
- Expected continuity: low resistance between lamp ground and chassis; open circuit when connector removed
- No short to battery or ground on wiring harness
Diagnostic algorithm
- Connect a manufacturer-capable scan tool, read DTC C1920 and any related codes, note freeze-frame data and attempt to actuate LED 1 from the tool.
- Visually inspect lamp, lens, connector and wiring for physical damage, corrosion, water entry or signs of overheating. Repair as required.
- Verify fuses and power distribution for the specific lamp circuit; replace blown fuses only after finding cause.
- With connector disconnected, measure for shorts: check for continuity between positive circuit and ground (should not be shorted).
- Command the LED ON with scan tool and measure supply voltage at the lamp connector. If no voltage, trace and test the feed and the control module output.
- Check ground integrity at the lamp ground point (measure voltage drop while commanding lamp ON).
- If supply and ground are correct but lamp does not illuminate, measure LED module current/resistance or swap with a known-good lamp/module to verify lamp failure.
- If wiring and lamp are good but problem persists, test/replace or reprogram the lighting control/BCM per factory procedures.
- After repairs, clear codes and confirm lamp operation and that the DTC does not return during a road or function test.
Likely causes
- Damaged or chafed wiring harness to LED lamp
- Corroded lamp connector allowing intermittent contact
- Internal failure of LED lamp module or driver
- Poor chassis or lamp ground connection
- Faulty BCM/lighting control module output or software anomaly
Fault status
Status
Stored when the control module detects an open, short or unacceptable electrical condition in the LED 1 circuit (supply, ground, PWM or current).
Repair difficulty: Medium
Diagnostic time: 0.5–2.0 hours
Similar codes
Workshop 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
C1920
MITSUBISHI
C — Chassis
Transmitter BATT.voltage,Tire2
Views:
UK: 14
EN: 13
RU: 11
AI status
Completed
Completed
100%
Causes
- Open circuit in LED 1 wiring (broken wire, disconnected connector)
- Short to ground or short to battery in LED 1 wiring
- Corroded, loose or water-damaged connector/contacts at the lamp
- Failed LED lamp or internal LED driver/module
- Blown fuse or poor ground at lamp or module
- Faulty body/control module output or software issue
Symptoms
- LED 1 (lamp or segment) fails to illuminate
- Intermittent operation or flickering of the LED
- Illumination warning or lamp malfunction message displayed on dash
- Multiple LED lighting functions affected if shared circuit or control module
- Possible increased current draw or blown fuse
What to check
- Use a diagnostic scan tool to read fault details, freeze frame and occurrence count and attempt to actuate LED 1 from the tool
- Visually inspect the lamp assembly, connector and wiring for damage, corrosion, water ingress or loose pins
- Verify fuses and related power/ground distribution for the lamp circuit
- With lamp disconnected, check continuity between the lamp connector and the control module connector (look for opens/shorts)
- Measure battery voltage at the lamp connector with lamp commanded ON and OFF
- Measure resistance/current of the LED module if accessible (compare to specification)
Signal parameters
- Supply voltage at lamp connector: ~11–14 V when ON (battery voltage range)
- Command signal: PWM duty cycle 0–100% when dimming is used (frequency depends on vehicle design)
- Typical LED module current: usually under 1 A for a single LED string (manufacturer-specific)
- Expected continuity: low resistance between lamp ground and chassis; open circuit when connector removed
- No short to battery or ground on wiring harness
Diagnostic algorithm
- Connect a manufacturer-capable scan tool, read DTC C1920 and any related codes, note freeze-frame data and attempt to actuate LED 1 from the tool.
- Visually inspect lamp, lens, connector and wiring for physical damage, corrosion, water entry or signs of overheating. Repair as required.
- Verify fuses and power distribution for the specific lamp circuit; replace blown fuses only after finding cause.
- With connector disconnected, measure for shorts: check for continuity between positive circuit and ground (should not be shorted).
- Command the LED ON with scan tool and measure supply voltage at the lamp connector. If no voltage, trace and test the feed and the control module output.
- Check ground integrity at the lamp ground point (measure voltage drop while commanding lamp ON).
- If supply and ground are correct but lamp does not illuminate, measure LED module current/resistance or swap with a known-good lamp/module to verify lamp failure.
- If wiring and lamp are good but problem persists, test/replace or reprogram the lighting control/BCM per factory procedures.
- After repairs, clear codes and confirm lamp operation and that the DTC does not return during a road or function test.
Likely causes
- Damaged or chafed wiring harness to LED lamp
- Corroded lamp connector allowing intermittent contact
- Internal failure of LED lamp module or driver
- Poor chassis or lamp ground connection
- Faulty BCM/lighting control module output or software anomaly
Fault status
Status
Stored when the control module detects an open, short or unacceptable electrical condition in the LED 1 circuit (supply, ground, PWM or current).
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
C1920
Other
C — Chassis
Led #1 Circuit Failure
Views:
UK: 14
EN: 22
RU: 13
AI status
Completed
Completed
100%
Causes
- Open circuit in LED 1 wiring (broken wire, disconnected connector)
- Short to ground or short to battery in LED 1 wiring
- Corroded, loose or water-damaged connector/contacts at the lamp
- Failed LED lamp or internal LED driver/module
- Blown fuse or poor ground at lamp or module
- Faulty body/control module output or software issue
Symptoms
- LED 1 (lamp or segment) fails to illuminate
- Intermittent operation or flickering of the LED
- Illumination warning or lamp malfunction message displayed on dash
- Multiple LED lighting functions affected if shared circuit or control module
- Possible increased current draw or blown fuse
What to check
- Use a diagnostic scan tool to read fault details, freeze frame and occurrence count and attempt to actuate LED 1 from the tool
- Visually inspect the lamp assembly, connector and wiring for damage, corrosion, water ingress or loose pins
- Verify fuses and related power/ground distribution for the lamp circuit
- With lamp disconnected, check continuity between the lamp connector and the control module connector (look for opens/shorts)
- Measure battery voltage at the lamp connector with lamp commanded ON and OFF
- Measure resistance/current of the LED module if accessible (compare to specification)
Signal parameters
- Supply voltage at lamp connector: ~11–14 V when ON (battery voltage range)
- Command signal: PWM duty cycle 0–100% when dimming is used (frequency depends on vehicle design)
- Typical LED module current: usually under 1 A for a single LED string (manufacturer-specific)
- Expected continuity: low resistance between lamp ground and chassis; open circuit when connector removed
- No short to battery or ground on wiring harness
Diagnostic algorithm
- Connect a manufacturer-capable scan tool, read DTC C1920 and any related codes, note freeze-frame data and attempt to actuate LED 1 from the tool.
- Visually inspect lamp, lens, connector and wiring for physical damage, corrosion, water entry or signs of overheating. Repair as required.
- Verify fuses and power distribution for the specific lamp circuit; replace blown fuses only after finding cause.
- With connector disconnected, measure for shorts: check for continuity between positive circuit and ground (should not be shorted).
- Command the LED ON with scan tool and measure supply voltage at the lamp connector. If no voltage, trace and test the feed and the control module output.
- Check ground integrity at the lamp ground point (measure voltage drop while commanding lamp ON).
- If supply and ground are correct but lamp does not illuminate, measure LED module current/resistance or swap with a known-good lamp/module to verify lamp failure.
- If wiring and lamp are good but problem persists, test/replace or reprogram the lighting control/BCM per factory procedures.
- After repairs, clear codes and confirm lamp operation and that the DTC does not return during a road or function test.
Likely causes
- Damaged or chafed wiring harness to LED lamp
- Corroded lamp connector allowing intermittent contact
- Internal failure of LED lamp module or driver
- Poor chassis or lamp ground connection
- Faulty BCM/lighting control module output or software anomaly
Fault status
Status
Stored when the control module detects an open, short or unacceptable electrical condition in the LED 1 circuit (supply, ground, PWM or current).
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
