Toggle Side Panel

Shopping Cart

No products in the basket.

Shopping Cart

No products in the basket.

Close search
Home / DTC / B1502 — Left turn indicator warning lamp short to ground

B1502 — Left turn indicator warning lamp short to ground

Detailed page for trouble code B1502.

34,113codes
59brands
11,622generic
22,491specific
All codes P-codes (Powertrain) B-codes (Body) C-codes (Chassis) U-codes (Network/User) Tesla Alerts
Reset
Code

B1502

ALFA ROMEO B — Body

Left turn indicator warning lamp short to ground

Brand: ALFA ROMEO
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Broken or chafed wiring with exposed conductor contacting chassis ground
  • Corroded or damaged lamp holder or bulb causing internal short
  • Faulty or contaminated instrument cluster/indicator lamp assembly
  • Poor or loose ground connection at lamp or body control module (BCM)
  • Incorrect replacement bulb or aftermarket modification creating low resistance path
  • Moisture/water ingress in connector or lamp housing

Symptoms

  • Left turn indicator warning lamp not operating or behaving abnormally
  • Turn signal may not flash or may flash rapidly on left side
  • Instrument cluster warning related to left indicator
  • Possible blown fuse if short current is high
  • Intermittent function when moving wiring or connector

What to check

  • Confirm stored DTC and freeze frame with diagnostic scanner; note if code is current or historic
  • Visual inspection of left rear/front turn lamp, socket and wiring for damage, corrosion or moisture
  • Inspect connector pins at lamp and BCM for corrosion, bent pins, or pushed-back wires
  • Check related fuses and ground points for security and corrosion
  • Swap left and right lamp/bulb (if identical) to see if fault follows the lamp
  • Wiggle test harness while observing lamp operation or scanner live data to reproduce fault

Signal parameters

  • Standby (ignition ON, indicators OFF): open circuit or very high resistance between lamp feed and ground
  • Active (left indicator ON): lamp feed should show pulsed voltage ~11–14 V (vehicle battery voltage) at turn-signal flash rate (~0.5–1.5 Hz)
  • Shorted condition: low resistance/near 0 Ω between lamp feed and ground or steady near 0 V instead of pulsed battery voltage
  • Typical lamp current draw (single incandescent indicator): a few hundred milliamps; significant excess current suggests a short or wrong bulb

Diagnostic algorithm

  1. Read and record DTC(s) and live data from the body/comfort module and clear codes to see if fault returns.
  2. Perform a visual inspection of left indicator lamp(s), socket, wiring harness, and nearby chassis for rubbed-through insulation or water ingress.
  3. Remove bulb and inspect for signs of shorting or incorrect bulb type; measure resistance between bulb contacts and ground with bulb removed.
  4. With connector disconnected from the lamp, measure voltage at the lamp feed terminal while activating left turn signal: expect pulsed battery voltage. If terminal is low/grounded with connector disconnected, short is upstream toward BCM/wiring.
  5. Measure resistance between feed terminal and chassis ground with ignition off. Low resistance indicates a short to ground. Isolate sections of wiring (disconnect intermediate connectors) to localize the short.
  6. Inspect and test ground points for the lamp and BCM; clean and tighten as required.
  7. If wiring and lamp socket OK, test/replace the lamp assembly or instrument cluster indicator lamp. If fault persists and wiring checks are clear, test BCM output driver for that channel (compare to right-side channel if possible).
  8. Repair or replace damaged wiring, connectors, lamp socket, or module as indicated. After repairs clear codes and retest all functions, verifying no return of the fault.

Likely causes

  • Damaged lamp holder or socket allowing contact between terminals and housing
  • Connector corrosion or bent pin creating direct ground path
  • Wiring harness rubbed through where it contacts body panels
  • Failed turn indicator lamp (shorted filament) or wrong bulb type installed

Fault status

⚠️ Status
Left turn indicator warning lamp circuit - short to ground detected by vehicle control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1500 B1501 B1503 B1504
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

B1502

FIAT B — Body

Left turn indicator warning lamp short to ground

Brand: FIAT
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Broken or chafed wiring with exposed conductor contacting chassis ground
  • Corroded or damaged lamp holder or bulb causing internal short
  • Faulty or contaminated instrument cluster/indicator lamp assembly
  • Poor or loose ground connection at lamp or body control module (BCM)
  • Incorrect replacement bulb or aftermarket modification creating low resistance path
  • Moisture/water ingress in connector or lamp housing

Symptoms

  • Left turn indicator warning lamp not operating or behaving abnormally
  • Turn signal may not flash or may flash rapidly on left side
  • Instrument cluster warning related to left indicator
  • Possible blown fuse if short current is high
  • Intermittent function when moving wiring or connector

What to check

  • Confirm stored DTC and freeze frame with diagnostic scanner; note if code is current or historic
  • Visual inspection of left rear/front turn lamp, socket and wiring for damage, corrosion or moisture
  • Inspect connector pins at lamp and BCM for corrosion, bent pins, or pushed-back wires
  • Check related fuses and ground points for security and corrosion
  • Swap left and right lamp/bulb (if identical) to see if fault follows the lamp
  • Wiggle test harness while observing lamp operation or scanner live data to reproduce fault

Signal parameters

  • Standby (ignition ON, indicators OFF): open circuit or very high resistance between lamp feed and ground
  • Active (left indicator ON): lamp feed should show pulsed voltage ~11–14 V (vehicle battery voltage) at turn-signal flash rate (~0.5–1.5 Hz)
  • Shorted condition: low resistance/near 0 Ω between lamp feed and ground or steady near 0 V instead of pulsed battery voltage
  • Typical lamp current draw (single incandescent indicator): a few hundred milliamps; significant excess current suggests a short or wrong bulb

Diagnostic algorithm

  1. Read and record DTC(s) and live data from the body/comfort module and clear codes to see if fault returns.
  2. Perform a visual inspection of left indicator lamp(s), socket, wiring harness, and nearby chassis for rubbed-through insulation or water ingress.
  3. Remove bulb and inspect for signs of shorting or incorrect bulb type; measure resistance between bulb contacts and ground with bulb removed.
  4. With connector disconnected from the lamp, measure voltage at the lamp feed terminal while activating left turn signal: expect pulsed battery voltage. If terminal is low/grounded with connector disconnected, short is upstream toward BCM/wiring.
  5. Measure resistance between feed terminal and chassis ground with ignition off. Low resistance indicates a short to ground. Isolate sections of wiring (disconnect intermediate connectors) to localize the short.
  6. Inspect and test ground points for the lamp and BCM; clean and tighten as required.
  7. If wiring and lamp socket OK, test/replace the lamp assembly or instrument cluster indicator lamp. If fault persists and wiring checks are clear, test BCM output driver for that channel (compare to right-side channel if possible).
  8. Repair or replace damaged wiring, connectors, lamp socket, or module as indicated. After repairs clear codes and retest all functions, verifying no return of the fault.

Likely causes

  • Damaged lamp holder or socket allowing contact between terminals and housing
  • Connector corrosion or bent pin creating direct ground path
  • Wiring harness rubbed through where it contacts body panels
  • Failed turn indicator lamp (shorted filament) or wrong bulb type installed

Fault status

⚠️ Status
Left turn indicator warning lamp circuit - short to ground detected by vehicle control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1500 B1501 B1503 B1504
Repair manuals

Manual library for FIAT

26

Browse 26 FIAT manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

FIAT

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

B1502

LAND ROVER B — Body

Left turn signal bulb - short circuit to ground

Brand: LAND ROVER
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Broken or chafed wiring with exposed conductor contacting chassis ground
  • Corroded or damaged lamp holder or bulb causing internal short
  • Faulty or contaminated instrument cluster/indicator lamp assembly
  • Poor or loose ground connection at lamp or body control module (BCM)
  • Incorrect replacement bulb or aftermarket modification creating low resistance path
  • Moisture/water ingress in connector or lamp housing

Symptoms

  • Left turn indicator warning lamp not operating or behaving abnormally
  • Turn signal may not flash or may flash rapidly on left side
  • Instrument cluster warning related to left indicator
  • Possible blown fuse if short current is high
  • Intermittent function when moving wiring or connector

What to check

  • Confirm stored DTC and freeze frame with diagnostic scanner; note if code is current or historic
  • Visual inspection of left rear/front turn lamp, socket and wiring for damage, corrosion or moisture
  • Inspect connector pins at lamp and BCM for corrosion, bent pins, or pushed-back wires
  • Check related fuses and ground points for security and corrosion
  • Swap left and right lamp/bulb (if identical) to see if fault follows the lamp
  • Wiggle test harness while observing lamp operation or scanner live data to reproduce fault

Signal parameters

  • Standby (ignition ON, indicators OFF): open circuit or very high resistance between lamp feed and ground
  • Active (left indicator ON): lamp feed should show pulsed voltage ~11–14 V (vehicle battery voltage) at turn-signal flash rate (~0.5–1.5 Hz)
  • Shorted condition: low resistance/near 0 Ω between lamp feed and ground or steady near 0 V instead of pulsed battery voltage
  • Typical lamp current draw (single incandescent indicator): a few hundred milliamps; significant excess current suggests a short or wrong bulb

Diagnostic algorithm

  1. Read and record DTC(s) and live data from the body/comfort module and clear codes to see if fault returns.
  2. Perform a visual inspection of left indicator lamp(s), socket, wiring harness, and nearby chassis for rubbed-through insulation or water ingress.
  3. Remove bulb and inspect for signs of shorting or incorrect bulb type; measure resistance between bulb contacts and ground with bulb removed.
  4. With connector disconnected from the lamp, measure voltage at the lamp feed terminal while activating left turn signal: expect pulsed battery voltage. If terminal is low/grounded with connector disconnected, short is upstream toward BCM/wiring.
  5. Measure resistance between feed terminal and chassis ground with ignition off. Low resistance indicates a short to ground. Isolate sections of wiring (disconnect intermediate connectors) to localize the short.
  6. Inspect and test ground points for the lamp and BCM; clean and tighten as required.
  7. If wiring and lamp socket OK, test/replace the lamp assembly or instrument cluster indicator lamp. If fault persists and wiring checks are clear, test BCM output driver for that channel (compare to right-side channel if possible).
  8. Repair or replace damaged wiring, connectors, lamp socket, or module as indicated. After repairs clear codes and retest all functions, verifying no return of the fault.

Likely causes

  • Damaged lamp holder or socket allowing contact between terminals and housing
  • Connector corrosion or bent pin creating direct ground path
  • Wiring harness rubbed through where it contacts body panels
  • Failed turn indicator lamp (shorted filament) or wrong bulb type installed

Fault status

⚠️ Status
Left turn indicator warning lamp circuit - short to ground detected by vehicle control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1500 B1501 B1503 B1504
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

B1502

MITSUBISHI B — Body

RR curtain ABG squib grounding

Brand: MITSUBISHI
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Broken or chafed wiring with exposed conductor contacting chassis ground
  • Corroded or damaged lamp holder or bulb causing internal short
  • Faulty or contaminated instrument cluster/indicator lamp assembly
  • Poor or loose ground connection at lamp or body control module (BCM)
  • Incorrect replacement bulb or aftermarket modification creating low resistance path
  • Moisture/water ingress in connector or lamp housing

Symptoms

  • Left turn indicator warning lamp not operating or behaving abnormally
  • Turn signal may not flash or may flash rapidly on left side
  • Instrument cluster warning related to left indicator
  • Possible blown fuse if short current is high
  • Intermittent function when moving wiring or connector

What to check

  • Confirm stored DTC and freeze frame with diagnostic scanner; note if code is current or historic
  • Visual inspection of left rear/front turn lamp, socket and wiring for damage, corrosion or moisture
  • Inspect connector pins at lamp and BCM for corrosion, bent pins, or pushed-back wires
  • Check related fuses and ground points for security and corrosion
  • Swap left and right lamp/bulb (if identical) to see if fault follows the lamp
  • Wiggle test harness while observing lamp operation or scanner live data to reproduce fault

Signal parameters

  • Standby (ignition ON, indicators OFF): open circuit or very high resistance between lamp feed and ground
  • Active (left indicator ON): lamp feed should show pulsed voltage ~11–14 V (vehicle battery voltage) at turn-signal flash rate (~0.5–1.5 Hz)
  • Shorted condition: low resistance/near 0 Ω between lamp feed and ground or steady near 0 V instead of pulsed battery voltage
  • Typical lamp current draw (single incandescent indicator): a few hundred milliamps; significant excess current suggests a short or wrong bulb

Diagnostic algorithm

  1. Read and record DTC(s) and live data from the body/comfort module and clear codes to see if fault returns.
  2. Perform a visual inspection of left indicator lamp(s), socket, wiring harness, and nearby chassis for rubbed-through insulation or water ingress.
  3. Remove bulb and inspect for signs of shorting or incorrect bulb type; measure resistance between bulb contacts and ground with bulb removed.
  4. With connector disconnected from the lamp, measure voltage at the lamp feed terminal while activating left turn signal: expect pulsed battery voltage. If terminal is low/grounded with connector disconnected, short is upstream toward BCM/wiring.
  5. Measure resistance between feed terminal and chassis ground with ignition off. Low resistance indicates a short to ground. Isolate sections of wiring (disconnect intermediate connectors) to localize the short.
  6. Inspect and test ground points for the lamp and BCM; clean and tighten as required.
  7. If wiring and lamp socket OK, test/replace the lamp assembly or instrument cluster indicator lamp. If fault persists and wiring checks are clear, test BCM output driver for that channel (compare to right-side channel if possible).
  8. Repair or replace damaged wiring, connectors, lamp socket, or module as indicated. After repairs clear codes and retest all functions, verifying no return of the fault.

Likely causes

  • Damaged lamp holder or socket allowing contact between terminals and housing
  • Connector corrosion or bent pin creating direct ground path
  • Wiring harness rubbed through where it contacts body panels
  • Failed turn indicator lamp (shorted filament) or wrong bulb type installed

Fault status

⚠️ Status
Left turn indicator warning lamp circuit - short to ground detected by vehicle control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1500 B1501 B1503 B1504
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

B1502

Other B — Body

Lamp Turn Signal Left Circuit Short To Ground

Brand: Other
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Broken or chafed wiring with exposed conductor contacting chassis ground
  • Corroded or damaged lamp holder or bulb causing internal short
  • Faulty or contaminated instrument cluster/indicator lamp assembly
  • Poor or loose ground connection at lamp or body control module (BCM)
  • Incorrect replacement bulb or aftermarket modification creating low resistance path
  • Moisture/water ingress in connector or lamp housing

Symptoms

  • Left turn indicator warning lamp not operating or behaving abnormally
  • Turn signal may not flash or may flash rapidly on left side
  • Instrument cluster warning related to left indicator
  • Possible blown fuse if short current is high
  • Intermittent function when moving wiring or connector

What to check

  • Confirm stored DTC and freeze frame with diagnostic scanner; note if code is current or historic
  • Visual inspection of left rear/front turn lamp, socket and wiring for damage, corrosion or moisture
  • Inspect connector pins at lamp and BCM for corrosion, bent pins, or pushed-back wires
  • Check related fuses and ground points for security and corrosion
  • Swap left and right lamp/bulb (if identical) to see if fault follows the lamp
  • Wiggle test harness while observing lamp operation or scanner live data to reproduce fault

Signal parameters

  • Standby (ignition ON, indicators OFF): open circuit or very high resistance between lamp feed and ground
  • Active (left indicator ON): lamp feed should show pulsed voltage ~11–14 V (vehicle battery voltage) at turn-signal flash rate (~0.5–1.5 Hz)
  • Shorted condition: low resistance/near 0 Ω between lamp feed and ground or steady near 0 V instead of pulsed battery voltage
  • Typical lamp current draw (single incandescent indicator): a few hundred milliamps; significant excess current suggests a short or wrong bulb

Diagnostic algorithm

  1. Read and record DTC(s) and live data from the body/comfort module and clear codes to see if fault returns.
  2. Perform a visual inspection of left indicator lamp(s), socket, wiring harness, and nearby chassis for rubbed-through insulation or water ingress.
  3. Remove bulb and inspect for signs of shorting or incorrect bulb type; measure resistance between bulb contacts and ground with bulb removed.
  4. With connector disconnected from the lamp, measure voltage at the lamp feed terminal while activating left turn signal: expect pulsed battery voltage. If terminal is low/grounded with connector disconnected, short is upstream toward BCM/wiring.
  5. Measure resistance between feed terminal and chassis ground with ignition off. Low resistance indicates a short to ground. Isolate sections of wiring (disconnect intermediate connectors) to localize the short.
  6. Inspect and test ground points for the lamp and BCM; clean and tighten as required.
  7. If wiring and lamp socket OK, test/replace the lamp assembly or instrument cluster indicator lamp. If fault persists and wiring checks are clear, test BCM output driver for that channel (compare to right-side channel if possible).
  8. Repair or replace damaged wiring, connectors, lamp socket, or module as indicated. After repairs clear codes and retest all functions, verifying no return of the fault.

Likely causes

  • Damaged lamp holder or socket allowing contact between terminals and housing
  • Connector corrosion or bent pin creating direct ground path
  • Wiring harness rubbed through where it contacts body panels
  • Failed turn indicator lamp (shorted filament) or wrong bulb type installed

Fault status

⚠️ Status
Left turn indicator warning lamp circuit - short to ground detected by vehicle control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1500 B1501 B1503 B1504
6,864

The library contains 6,864 repair and diagnostic manuals. Choose a brand to open the full manual tree by year, model and trim.

AUDI
1,160
DAEWOO
75
FIAT
26
GENESIS
207
HUMMER
138
HYUNDAI
371
ISUZU
86
LAND ROVER
320
LEXUS
30
LINCOLN
166
MERCEDES-BENZ
856
MERCURY
296
MITSUBISHI
406
PORSCHE
136
TESLA
58
TOYOTA
2,042
TRIUMPH
131
VOLKSWAGEN
139
VOLVO
221
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

Report

Harassment or bullying behavior
Contains mature or sensitive content
Contains misleading or false information
Contains abusive or derogatory content
Contains spam, fake content or potential malware

Block Member?

Please confirm you want to block this member.

You will no longer be able to:

  • See blocked member's posts
  • Mention this member in posts
  • Invite this member to groups
  • Message this member
  • Add this member as a connection

Please note: This action will also remove this member from your connections and send a report to the site admin. Please allow a few minutes for this process to complete.

Report

You have already reported this .