Code
B1503
ALFA ROMEO
B — Body
Right turn indicator warning lamp
Views:
UK: 5
EN: 15
RU: 8
AI status
Completed
Completed
100%
Causes
- Blown or faulty right turn signal bulb (front or rear)
- Corroded or loose bulb socket/connector
- Broken, shorted or high-resistance wiring in the right turn circuit
- Poor or missing ground at the lamp or BCM
- Faulty BCM / instrument cluster output or input circuit
- Incorrect replacement bulb type (LED without proper load/resistor)
Symptoms
- Right turn indicator warning lamp message or warning icon illuminated on dash
- Right-side turn signal (front or rear) does not illuminate or flashes irregularly
- Turn signal self-test shows right lamp failure
- Hyperflash or no flash when signaling right turn
- Intermittent operation of right turn signal
What to check
- Verify stored DTCs and freeze frame data with appropriate diagnostic scan tool
- Visually inspect right front and right rear bulbs and sockets for corrosion or damage
- Operate right turn signal and observe lamp behavior (front and rear)
- Swap right bulb with left bulb to see if fault follows the bulb
- Check related fuses and relays for continuity and correct operation
- Perform continuity and resistance checks on wiring between BCM/cluster and right lamp sockets
Signal parameters
- Turn lamp supply voltage when active: ~11–14 V (vehicle battery voltage under load)
- No-load voltage at lamp connector when off: ~0 V (or battery voltage via bulb filament depending on circuit design)
- Typical incandescent bulb current draw: 0.5–2.5 A per lamp (varies by bulb)
- LED lamp current: typically
- Expected continuity: low resistance between lamp terminal and BCM output when lamp connected; open if bulb removed
Diagnostic algorithm
- Connect a diagnostic scanner, read/record DTC B1503 and any related codes; note freeze-frame/live data. 2) Reproduce the symptom: operate right turn signal and observe dash indicator and vehicle lamps. 3) Visually inspect right-side bulbs and sockets for blown filament, corrosion or damage. Replace bulb if suspect. 4) Swap right and left bulbs. If fault moves to the other side, replace the bulb. 5) With turn signal ON, backprobe the right lamp connector: verify ~12 V is present when lamp should be on and that ground is good. Check current draw. 6) If there is voltage but lamp does not light, inspect socket and wiring for open/high resistance; repair as needed. 7) If no voltage from BCM/cluster output, check connector pins, continuity to BCM and for shorts to ground/power. Repair wiring or connector fault. 8) Check and clean ground points for the lamp circuit; ensure tight mechanical connection. 9) If wiring and lamps test good, inspect BCM/cluster outputs and perform module tests using manufacturer procedures; reprogram or replace module only after confirming external wiring and lamps are OK. 10) Clear codes and retest to verify repair. Document repair steps and components replaced.
Likely causes
- Blown right turn bulb (most common)
- Corroded socket/poor ground at the right lamp
- Open or short in wiring harness to right turn lamp
- Faulty lamp monitoring input/output within the BCM or cluster
Fault status
Status
Fault detected in the right turn indicator lamp circuit (monitoring shows open/short or abnormal lamp load).
Repair difficulty: Medium
Diagnostic time: 0.5 - 2.0 hours
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Code
B1503
FIAT
B — Body
Right turn indicator warning lamp
Views:
UK: 5
EN: 13
RU: 9
AI status
Completed
Completed
100%
Causes
- Blown or faulty right turn signal bulb (front or rear)
- Corroded or loose bulb socket/connector
- Broken, shorted or high-resistance wiring in the right turn circuit
- Poor or missing ground at the lamp or BCM
- Faulty BCM / instrument cluster output or input circuit
- Incorrect replacement bulb type (LED without proper load/resistor)
Symptoms
- Right turn indicator warning lamp message or warning icon illuminated on dash
- Right-side turn signal (front or rear) does not illuminate or flashes irregularly
- Turn signal self-test shows right lamp failure
- Hyperflash or no flash when signaling right turn
- Intermittent operation of right turn signal
What to check
- Verify stored DTCs and freeze frame data with appropriate diagnostic scan tool
- Visually inspect right front and right rear bulbs and sockets for corrosion or damage
- Operate right turn signal and observe lamp behavior (front and rear)
- Swap right bulb with left bulb to see if fault follows the bulb
- Check related fuses and relays for continuity and correct operation
- Perform continuity and resistance checks on wiring between BCM/cluster and right lamp sockets
Signal parameters
- Turn lamp supply voltage when active: ~11–14 V (vehicle battery voltage under load)
- No-load voltage at lamp connector when off: ~0 V (or battery voltage via bulb filament depending on circuit design)
- Typical incandescent bulb current draw: 0.5–2.5 A per lamp (varies by bulb)
- LED lamp current: typically
- Expected continuity: low resistance between lamp terminal and BCM output when lamp connected; open if bulb removed
Diagnostic algorithm
- Connect a diagnostic scanner, read/record DTC B1503 and any related codes; note freeze-frame/live data. 2) Reproduce the symptom: operate right turn signal and observe dash indicator and vehicle lamps. 3) Visually inspect right-side bulbs and sockets for blown filament, corrosion or damage. Replace bulb if suspect. 4) Swap right and left bulbs. If fault moves to the other side, replace the bulb. 5) With turn signal ON, backprobe the right lamp connector: verify ~12 V is present when lamp should be on and that ground is good. Check current draw. 6) If there is voltage but lamp does not light, inspect socket and wiring for open/high resistance; repair as needed. 7) If no voltage from BCM/cluster output, check connector pins, continuity to BCM and for shorts to ground/power. Repair wiring or connector fault. 8) Check and clean ground points for the lamp circuit; ensure tight mechanical connection. 9) If wiring and lamps test good, inspect BCM/cluster outputs and perform module tests using manufacturer procedures; reprogram or replace module only after confirming external wiring and lamps are OK. 10) Clear codes and retest to verify repair. Document repair steps and components replaced.
Likely causes
- Blown right turn bulb (most common)
- Corroded socket/poor ground at the right lamp
- Open or short in wiring harness to right turn lamp
- Faulty lamp monitoring input/output within the BCM or cluster
Fault status
Status
Fault detected in the right turn indicator lamp circuit (monitoring shows open/short or abnormal lamp load).
Repair difficulty: Medium
Diagnostic time: 0.5 - 2.0 hours
Similar codes
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Code
B1503
LAND ROVER
B — Body
Right turn signal indicator - circuit failure
Views:
UK: 8
EN: 23
RU: 17
AI status
Completed
Completed
100%
Causes
- Blown or faulty right turn signal bulb (front or rear)
- Corroded or loose bulb socket/connector
- Broken, shorted or high-resistance wiring in the right turn circuit
- Poor or missing ground at the lamp or BCM
- Faulty BCM / instrument cluster output or input circuit
- Incorrect replacement bulb type (LED without proper load/resistor)
Symptoms
- Right turn indicator warning lamp message or warning icon illuminated on dash
- Right-side turn signal (front or rear) does not illuminate or flashes irregularly
- Turn signal self-test shows right lamp failure
- Hyperflash or no flash when signaling right turn
- Intermittent operation of right turn signal
What to check
- Verify stored DTCs and freeze frame data with appropriate diagnostic scan tool
- Visually inspect right front and right rear bulbs and sockets for corrosion or damage
- Operate right turn signal and observe lamp behavior (front and rear)
- Swap right bulb with left bulb to see if fault follows the bulb
- Check related fuses and relays for continuity and correct operation
- Perform continuity and resistance checks on wiring between BCM/cluster and right lamp sockets
Signal parameters
- Turn lamp supply voltage when active: ~11–14 V (vehicle battery voltage under load)
- No-load voltage at lamp connector when off: ~0 V (or battery voltage via bulb filament depending on circuit design)
- Typical incandescent bulb current draw: 0.5–2.5 A per lamp (varies by bulb)
- LED lamp current: typically
- Expected continuity: low resistance between lamp terminal and BCM output when lamp connected; open if bulb removed
Diagnostic algorithm
- Connect a diagnostic scanner, read/record DTC B1503 and any related codes; note freeze-frame/live data. 2) Reproduce the symptom: operate right turn signal and observe dash indicator and vehicle lamps. 3) Visually inspect right-side bulbs and sockets for blown filament, corrosion or damage. Replace bulb if suspect. 4) Swap right and left bulbs. If fault moves to the other side, replace the bulb. 5) With turn signal ON, backprobe the right lamp connector: verify ~12 V is present when lamp should be on and that ground is good. Check current draw. 6) If there is voltage but lamp does not light, inspect socket and wiring for open/high resistance; repair as needed. 7) If no voltage from BCM/cluster output, check connector pins, continuity to BCM and for shorts to ground/power. Repair wiring or connector fault. 8) Check and clean ground points for the lamp circuit; ensure tight mechanical connection. 9) If wiring and lamps test good, inspect BCM/cluster outputs and perform module tests using manufacturer procedures; reprogram or replace module only after confirming external wiring and lamps are OK. 10) Clear codes and retest to verify repair. Document repair steps and components replaced.
Likely causes
- Blown right turn bulb (most common)
- Corroded socket/poor ground at the right lamp
- Open or short in wiring harness to right turn lamp
- Faulty lamp monitoring input/output within the BCM or cluster
Fault status
Status
Fault detected in the right turn indicator lamp circuit (monitoring shows open/short or abnormal lamp load).
Repair difficulty: Medium
Diagnostic time: 0.5 - 2.0 hours
Similar codes
Workshop Manuals
Repair manuals for LAND ROVER
2
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualOfficial workshop manual for the Land Rover Defender 300Tdi (from 1996 model year). Contains specifications, adjustment, fault diagnosis and step-by-step repair and overhaul procedures for engine, transmission, axles, suspension, brakes, electrical and body. Intended for dealer workshops and trained technicians.
199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualWorkshop Manual Supplement and Body Repair Manual for the Land Rover Defender. Includes general specifications, maintenance schedules, tuning data and step‑by‑step repair procedures for engine, transmission, suspension, brakes, electrical and body repairs. Covers Defender models from 1999 and 2002 model years.
199,00 UAH
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Code
B1503
MITSUBISHI
B — Body
RR curtain ABG squib SHT.to BAT
Views:
UK: 9
EN: 23
RU: 19
AI status
Completed
Completed
100%
Causes
- Blown or faulty right turn signal bulb (front or rear)
- Corroded or loose bulb socket/connector
- Broken, shorted or high-resistance wiring in the right turn circuit
- Poor or missing ground at the lamp or BCM
- Faulty BCM / instrument cluster output or input circuit
- Incorrect replacement bulb type (LED without proper load/resistor)
Symptoms
- Right turn indicator warning lamp message or warning icon illuminated on dash
- Right-side turn signal (front or rear) does not illuminate or flashes irregularly
- Turn signal self-test shows right lamp failure
- Hyperflash or no flash when signaling right turn
- Intermittent operation of right turn signal
What to check
- Verify stored DTCs and freeze frame data with appropriate diagnostic scan tool
- Visually inspect right front and right rear bulbs and sockets for corrosion or damage
- Operate right turn signal and observe lamp behavior (front and rear)
- Swap right bulb with left bulb to see if fault follows the bulb
- Check related fuses and relays for continuity and correct operation
- Perform continuity and resistance checks on wiring between BCM/cluster and right lamp sockets
Signal parameters
- Turn lamp supply voltage when active: ~11–14 V (vehicle battery voltage under load)
- No-load voltage at lamp connector when off: ~0 V (or battery voltage via bulb filament depending on circuit design)
- Typical incandescent bulb current draw: 0.5–2.5 A per lamp (varies by bulb)
- LED lamp current: typically
- Expected continuity: low resistance between lamp terminal and BCM output when lamp connected; open if bulb removed
Diagnostic algorithm
- Connect a diagnostic scanner, read/record DTC B1503 and any related codes; note freeze-frame/live data. 2) Reproduce the symptom: operate right turn signal and observe dash indicator and vehicle lamps. 3) Visually inspect right-side bulbs and sockets for blown filament, corrosion or damage. Replace bulb if suspect. 4) Swap right and left bulbs. If fault moves to the other side, replace the bulb. 5) With turn signal ON, backprobe the right lamp connector: verify ~12 V is present when lamp should be on and that ground is good. Check current draw. 6) If there is voltage but lamp does not light, inspect socket and wiring for open/high resistance; repair as needed. 7) If no voltage from BCM/cluster output, check connector pins, continuity to BCM and for shorts to ground/power. Repair wiring or connector fault. 8) Check and clean ground points for the lamp circuit; ensure tight mechanical connection. 9) If wiring and lamps test good, inspect BCM/cluster outputs and perform module tests using manufacturer procedures; reprogram or replace module only after confirming external wiring and lamps are OK. 10) Clear codes and retest to verify repair. Document repair steps and components replaced.
Likely causes
- Blown right turn bulb (most common)
- Corroded socket/poor ground at the right lamp
- Open or short in wiring harness to right turn lamp
- Faulty lamp monitoring input/output within the BCM or cluster
Fault status
Status
Fault detected in the right turn indicator lamp circuit (monitoring shows open/short or abnormal lamp load).
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
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0
Send to email
Code
B1503
Other
B — Body
Lamp Turn Signal Right Circuit Failure
Views:
UK: 21
EN: 46
RU: 32
AI status
Completed
Completed
100%
Causes
- Blown or faulty right turn signal bulb (front or rear)
- Corroded or loose bulb socket/connector
- Broken, shorted or high-resistance wiring in the right turn circuit
- Poor or missing ground at the lamp or BCM
- Faulty BCM / instrument cluster output or input circuit
- Incorrect replacement bulb type (LED without proper load/resistor)
Symptoms
- Right turn indicator warning lamp message or warning icon illuminated on dash
- Right-side turn signal (front or rear) does not illuminate or flashes irregularly
- Turn signal self-test shows right lamp failure
- Hyperflash or no flash when signaling right turn
- Intermittent operation of right turn signal
What to check
- Verify stored DTCs and freeze frame data with appropriate diagnostic scan tool
- Visually inspect right front and right rear bulbs and sockets for corrosion or damage
- Operate right turn signal and observe lamp behavior (front and rear)
- Swap right bulb with left bulb to see if fault follows the bulb
- Check related fuses and relays for continuity and correct operation
- Perform continuity and resistance checks on wiring between BCM/cluster and right lamp sockets
Signal parameters
- Turn lamp supply voltage when active: ~11–14 V (vehicle battery voltage under load)
- No-load voltage at lamp connector when off: ~0 V (or battery voltage via bulb filament depending on circuit design)
- Typical incandescent bulb current draw: 0.5–2.5 A per lamp (varies by bulb)
- LED lamp current: typically
- Expected continuity: low resistance between lamp terminal and BCM output when lamp connected; open if bulb removed
Diagnostic algorithm
- Connect a diagnostic scanner, read/record DTC B1503 and any related codes; note freeze-frame/live data. 2) Reproduce the symptom: operate right turn signal and observe dash indicator and vehicle lamps. 3) Visually inspect right-side bulbs and sockets for blown filament, corrosion or damage. Replace bulb if suspect. 4) Swap right and left bulbs. If fault moves to the other side, replace the bulb. 5) With turn signal ON, backprobe the right lamp connector: verify ~12 V is present when lamp should be on and that ground is good. Check current draw. 6) If there is voltage but lamp does not light, inspect socket and wiring for open/high resistance; repair as needed. 7) If no voltage from BCM/cluster output, check connector pins, continuity to BCM and for shorts to ground/power. Repair wiring or connector fault. 8) Check and clean ground points for the lamp circuit; ensure tight mechanical connection. 9) If wiring and lamps test good, inspect BCM/cluster outputs and perform module tests using manufacturer procedures; reprogram or replace module only after confirming external wiring and lamps are OK. 10) Clear codes and retest to verify repair. Document repair steps and components replaced.
Likely causes
- Blown right turn bulb (most common)
- Corroded socket/poor ground at the right lamp
- Open or short in wiring harness to right turn lamp
- Faulty lamp monitoring input/output within the BCM or cluster
Fault status
Status
Fault detected in the right turn indicator lamp circuit (monitoring shows open/short or abnormal lamp load).
Repair difficulty: Medium
Diagnostic time: 0.5 - 2.0 hours
Similar codes
Workshop Manuals
Available brands with manuals
1
LAND ROVER 2
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualOfficial workshop manual for the Land Rover Defender 300Tdi (from 1996 model year). Contains specifications, adjustment, fault diagnosis and step-by-step repair and overhaul procedures for engine, transmission, axles, suspension, brakes, electrical and body. Intended for dealer workshops and trained technicians.
199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualWorkshop Manual Supplement and Body Repair Manual for the Land Rover Defender. Includes general specifications, maintenance schedules, tuning data and step‑by‑step repair procedures for engine, transmission, suspension, brakes, electrical and body repairs. Covers Defender models from 1999 and 2002 model years.
199,00 UAH
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
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0
Send to email