Code
C1511
HYUNDAI
C — Chassis
Head Lamp Switch
Views:
UK: 11
EN: 22
RU: 15
AI status
Completed
Completed
100%
Causes
- Faulty headlamp (headlight) switch or stalk assembly
- Open or shorted wiring between switch and BCM/relay
- Poor connector contact, corrosion, or water intrusion at switch or harness
- Blown fuse or faulty headlamp relay
- Faulty BCM / body ECU or internal module fault
- Incorrect installation after prior repair or aftermarket accessory interference
Symptoms
- Headlamps fail to turn on or off from switch
- Intermittent headlamp operation (works sometimes)
- Low beam or high beam stuck or not selectable
- Dash headlamp indicator does not respond correctly
- Daytime running lights (DRL) or auto headlamp function inoperative or erratic
- Possible related warnings or lamp-out indicators on dash
What to check
- Read all stored codes and freeze frame data with a scan tool; note any related U or B codes
- Visual inspection of headlamp switch, connectors, and wiring for corrosion, damage, or loose pins
- Check fuse(s) and headlamp relay(s) related to headlamp circuits
- Operate switch while observing scan tool live data (if available) and dash indicators
- Backprobe switch connector and BCM input for expected voltages and signal changes while operating switch
- Inspect wiring where it routes through steering column/shaft for chafing or breaks
Signal parameters
- Supply voltage to switch: approx. 11–14 V (with ignition on)
- Switch output to BCM/relay when ON: near battery voltage (~11–14 V)
- Ground continuity from switch housing/ground pin: close to 0 Ω
- Open-circuit resistance across closed switch contacts: typically very low (
- Open-circuit resistance when switch off: very high (kΩ to open)
- CAN/CAN-FD messages (if switch is electronic): relevant message present on bus and changing when switch is actuated — no errors on CAN bus
Diagnostic algorithm
- Connect a scan tool, read C1511 and any related codes; record freeze frame and live data. 2) Verify fuses and relays for headlamp circuits; replace if blown or faulty. 3) Perform a visual inspection of the headlamp switch, connector, and harness for damage, corrosion, or loose pins. 4) With ignition ON, backprobe switch power pin to confirm battery voltage present. 5) Operate the switch and backprobe the output pin(s); confirm switching to battery voltage when actuated (or proper CAN messages if it’s a multiplexed switch). 6) Check ground continuity for the switch and repair any high-resistance grounds. 7) If outputs from the switch look correct, check the BCM input pin for expected voltage change; if the BCM sees no change despite correct switch output, inspect harness between switch and BCM. 8) If intermittent, perform a wiggle test of the wiring and column area while monitoring live data to reproduce the fault. 9) If wiring and switch test good, check BCM for internal faults or replace BCM only after confirming input/output circuits, and follow vendor procedures for programming/verification. 10) After repairs, clear codes and perform functional test and short road/test cycle to confirm fault is resolved.
Likely causes
- Worn or internally failed headlamp switch
- Corroded or loose connector at switch or BCM
- Break or short in harness where it bends (steering column area)
- Faulty BCM output stage or internal input circuit
Fault status
Status
C1511 — Head Lamp Switch circuit malfunction detected. Inspect headlamp switch, related wiring/connectors, fuses/relays, and BCM input/output for opens, shorts, or intermittent faults.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
C1511
MITSUBISHI
C — Chassis
Torque sensor main
Views:
UK: 8
EN: 17
RU: 11
AI status
Completed
Completed
100%
Causes
- Faulty headlamp (headlight) switch or stalk assembly
- Open or shorted wiring between switch and BCM/relay
- Poor connector contact, corrosion, or water intrusion at switch or harness
- Blown fuse or faulty headlamp relay
- Faulty BCM / body ECU or internal module fault
- Incorrect installation after prior repair or aftermarket accessory interference
Symptoms
- Headlamps fail to turn on or off from switch
- Intermittent headlamp operation (works sometimes)
- Low beam or high beam stuck or not selectable
- Dash headlamp indicator does not respond correctly
- Daytime running lights (DRL) or auto headlamp function inoperative or erratic
- Possible related warnings or lamp-out indicators on dash
What to check
- Read all stored codes and freeze frame data with a scan tool; note any related U or B codes
- Visual inspection of headlamp switch, connectors, and wiring for corrosion, damage, or loose pins
- Check fuse(s) and headlamp relay(s) related to headlamp circuits
- Operate switch while observing scan tool live data (if available) and dash indicators
- Backprobe switch connector and BCM input for expected voltages and signal changes while operating switch
- Inspect wiring where it routes through steering column/shaft for chafing or breaks
Signal parameters
- Supply voltage to switch: approx. 11–14 V (with ignition on)
- Switch output to BCM/relay when ON: near battery voltage (~11–14 V)
- Ground continuity from switch housing/ground pin: close to 0 Ω
- Open-circuit resistance across closed switch contacts: typically very low (
- Open-circuit resistance when switch off: very high (kΩ to open)
- CAN/CAN-FD messages (if switch is electronic): relevant message present on bus and changing when switch is actuated — no errors on CAN bus
Diagnostic algorithm
- Connect a scan tool, read C1511 and any related codes; record freeze frame and live data. 2) Verify fuses and relays for headlamp circuits; replace if blown or faulty. 3) Perform a visual inspection of the headlamp switch, connector, and harness for damage, corrosion, or loose pins. 4) With ignition ON, backprobe switch power pin to confirm battery voltage present. 5) Operate the switch and backprobe the output pin(s); confirm switching to battery voltage when actuated (or proper CAN messages if it’s a multiplexed switch). 6) Check ground continuity for the switch and repair any high-resistance grounds. 7) If outputs from the switch look correct, check the BCM input pin for expected voltage change; if the BCM sees no change despite correct switch output, inspect harness between switch and BCM. 8) If intermittent, perform a wiggle test of the wiring and column area while monitoring live data to reproduce the fault. 9) If wiring and switch test good, check BCM for internal faults or replace BCM only after confirming input/output circuits, and follow vendor procedures for programming/verification. 10) After repairs, clear codes and perform functional test and short road/test cycle to confirm fault is resolved.
Likely causes
- Worn or internally failed headlamp switch
- Corroded or loose connector at switch or BCM
- Break or short in harness where it bends (steering column area)
- Faulty BCM output stage or internal input circuit
Fault status
Status
C1511 — Head Lamp Switch circuit malfunction detected. Inspect headlamp switch, related wiring/connectors, fuses/relays, and BCM input/output for opens, shorts, or intermittent faults.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
C1511
Other
C — Chassis
Left Front Wheel Pressure Reduction Performance Problem
Views:
UK: 16
EN: 29
RU: 21
AI status
Completed
Completed
100%
Causes
- Faulty headlamp (headlight) switch or stalk assembly
- Open or shorted wiring between switch and BCM/relay
- Poor connector contact, corrosion, or water intrusion at switch or harness
- Blown fuse or faulty headlamp relay
- Faulty BCM / body ECU or internal module fault
- Incorrect installation after prior repair or aftermarket accessory interference
Symptoms
- Headlamps fail to turn on or off from switch
- Intermittent headlamp operation (works sometimes)
- Low beam or high beam stuck or not selectable
- Dash headlamp indicator does not respond correctly
- Daytime running lights (DRL) or auto headlamp function inoperative or erratic
- Possible related warnings or lamp-out indicators on dash
What to check
- Read all stored codes and freeze frame data with a scan tool; note any related U or B codes
- Visual inspection of headlamp switch, connectors, and wiring for corrosion, damage, or loose pins
- Check fuse(s) and headlamp relay(s) related to headlamp circuits
- Operate switch while observing scan tool live data (if available) and dash indicators
- Backprobe switch connector and BCM input for expected voltages and signal changes while operating switch
- Inspect wiring where it routes through steering column/shaft for chafing or breaks
Signal parameters
- Supply voltage to switch: approx. 11–14 V (with ignition on)
- Switch output to BCM/relay when ON: near battery voltage (~11–14 V)
- Ground continuity from switch housing/ground pin: close to 0 Ω
- Open-circuit resistance across closed switch contacts: typically very low (
- Open-circuit resistance when switch off: very high (kΩ to open)
- CAN/CAN-FD messages (if switch is electronic): relevant message present on bus and changing when switch is actuated — no errors on CAN bus
Diagnostic algorithm
- Connect a scan tool, read C1511 and any related codes; record freeze frame and live data. 2) Verify fuses and relays for headlamp circuits; replace if blown or faulty. 3) Perform a visual inspection of the headlamp switch, connector, and harness for damage, corrosion, or loose pins. 4) With ignition ON, backprobe switch power pin to confirm battery voltage present. 5) Operate the switch and backprobe the output pin(s); confirm switching to battery voltage when actuated (or proper CAN messages if it’s a multiplexed switch). 6) Check ground continuity for the switch and repair any high-resistance grounds. 7) If outputs from the switch look correct, check the BCM input pin for expected voltage change; if the BCM sees no change despite correct switch output, inspect harness between switch and BCM. 8) If intermittent, perform a wiggle test of the wiring and column area while monitoring live data to reproduce the fault. 9) If wiring and switch test good, check BCM for internal faults or replace BCM only after confirming input/output circuits, and follow vendor procedures for programming/verification. 10) After repairs, clear codes and perform functional test and short road/test cycle to confirm fault is resolved.
Likely causes
- Worn or internally failed headlamp switch
- Corroded or loose connector at switch or BCM
- Break or short in harness where it bends (steering column area)
- Faulty BCM output stage or internal input circuit
Fault status
Status
C1511 — Head Lamp Switch circuit malfunction detected. Inspect headlamp switch, related wiring/connectors, fuses/relays, and BCM input/output for opens, shorts, or intermittent faults.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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