B1505

Code

FIAT B — Body

Right turn indicator warning lamp short to positive

Brand: FIAT

Type: B — Body

Views: UK: 6 EN: 21 RU: 3

AI status

Completed

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Page language: EN

Causes

Short to battery voltage on the right turn indicator lamp circuit
Damaged wiring insulation contacting a positive feed or harness splice
Corroded or water-intruded connector at the lamp or module
Failed cluster/indicator driver transistor or flasher module
Incorrect bulb or LED retrofit without proper resistor or wiring
Aftermarket accessory wired into the turn circuit

Symptoms

Right turn indicator/warning lamp stays on constantly or behaves erratically
Turn signal may not flash or flash abnormally for right side
Fuse for lighting/indicators may blow or show signs of heat
Dashboard warning lamp for turn indicator illuminated
Possible other lighting functions affected if shared feed is compromised

What to check

Retrieve/record freeze frame and live data with a scan tool; confirm B1505 presence and any related codes
Visually inspect right front/rear indicator lamp, bulb/socket, and wiring harness for damage, corrosion or water intrusion
Check fuses and relays related to turn signals and instrument cluster
Backprobe the right turn indicator lamp connector and measure voltage with key on and with turn signal commanded
Perform continuity and short-to-battery checks between circuit and positive with connector unplugged
Disconnect right indicator lamp; verify whether the code and symptom clear to isolate lamp vs. module

Signal parameters

Nominal lamp feed voltage when lamp OFF: ~0 V (grounded) or high-impedance (depends on circuit)
Nominal lamp feed when lamp ON: pulsed 12 V (turn signal flash) or switched ground depending on vehicle wiring
Fault condition: steady ~12 V present at lamp feed when it should be low/grounded or pulsed
Typical bulb current: incandescent 0.2–2 A (varies by bulb); LED loads much lower — check expected load for vehicle
Resistance of good bulb: typically 2–30 ohms (varies by type); open/infinite = bulb blown

Diagnostic algorithm

Read and record codes and live data. Note if code is current, pending, or historic.
Visually inspect right indicator lamp assembly, socket, and harness for damage, corrosion, or signs of water entry.
With ignition ON, backprobe lamp connector: measure voltage at pin with turn signal OFF and ON. Look for steady battery voltage when circuit should be low or pulsed.
Disconnect the lamp/socket. If the fault clears and voltage returns to expected, suspect lamp, socket, or short near connector. If fault remains, suspect wiring upstream or module.
Check continuity between lamp circuit and battery positive with connector disconnected to confirm short-to-positive. Also check continuity to chassis ground to verify no unintended ground path.
Inspect harness along routing for pinched wires, chafing, or aftermarket taps. Repair damaged insulation and secure harness.
If wiring and connector are good, test output driver (instrument cluster or flasher module) per manufacturer procedure — check for shorts inside module or regulator failure.
Repair or replace the faulty component (wire repair, socket replacement, cluster/module replacement). Clear codes and test drive to confirm repair; verify lamp operation and that code does not return.

Likely causes

Pinched/damaged wire near lamp or wiring harness causing contact with battery feed
Corroded connector or terminal causing conductive path to positive
Failed instrument cluster output stage (shorted transistor)
Bulb holder contaminated with conductive debris or moisture
Previous improper repair or accessory tap onto the turn lamp feed

Fault status

⚠️ Status

Control module detected a short to positive on the right turn indicator/warning lamp circuit. The lamp feed is seeing continuous battery voltage when it should be switched/pulsed or low. Investigation needed to locate short, faulty connector, lamp, or failed output driver.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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