Code
B16A2
MITSUBISHI
B — Body
Turn signal(LH) bulb outage
Views:
UK: 3
EN: 9
RU: 5
AI status
Completed
Completed
100%
Causes
- Burnt or failed turn signal bulb (LH)
- Corroded or loose bulb socket or connector
- Open or short in wiring between lamp and body control module (BCM)
- Faulty BCM/lamp driver output
- Blown fuse or poor ground connection
- Aftermarket LED lamp without proper load resistor or incorrect polarity
Symptoms
- Left turn signal indicator on dash does not flash or is steady off
- No illumination from LH turn signal lamp when activated
- Turn signal hyperflash or fast flashing (if another bulb is out)
- Dash lamp or BCM may store B16A2 fault code
What to check
- Visually inspect LH turn signal bulb for filament failure or damage
- Check bulb socket for corrosion, bent terminals, or melted plastic
- Verify fuse(s) for exterior lamps are intact
- Operate turn signal and observe front and rear LH lamp behavior
- Inspect wiring and connector for damage, corrosion, or pin push-out
- Scan BCM for stored codes and readiness flags; clear and re-test
Signal parameters
- Normal open-circuit socket voltage with lamp removed: battery voltage (~12–14.5 V) when signal is commanded ON
- Bulb current (incandescent) typical: 0.5–2.0 A depending on bulb wattage; near 0 A indicates open circuit
- LED lamp current: typically
- Flasher/BCM output: switched 0 V/12 V pulse at turn-signal rate (~1–2 Hz); absence of pulsed voltage indicates driver fault
Diagnostic algorithm
- Reproduce the symptom and confirm B16A2 is active with a scan tool. Note freeze-frame data if available.
- Visually inspect LH turn signal bulb; remove and inspect filament or LED module. Replace bulb with known-good bulb and retest.
- Inspect bulb socket and connector for corrosion, bent pins, or damage. Clean and repair terminals as needed.
- With turn signal ON, measure voltage at the lamp socket connector between supply and ground. Expected: battery voltage pulsed with signal. If 0 V, trace back toward fuse/relay/BCM.
- Check continuity from socket ground to chassis ground (
- Check associated fuse(s) and relays for continuity and proper operation. Replace if faulty.
- If wiring and fuses are good, back-probe BCM lamp output while operating signal. If no output, suspect BCM/lamp driver — verify other outputs and supply to BCM before replacing.
- Consider aftermarket LED causes: if LED installed, verify correct polarity and that BCM is compatible or use proper load resistor or flasher module.
- After repair, clear codes, cycle ignition, and operate turn signals to confirm code does not return.
Likely causes
- Failed bulb or poor contact in bulb socket
- Open wiring or connector corrosion at the lamp harness
- Blown fuse or bad ground at LH lamp circuit
Fault status
Status
Turn signal (LH) bulb outage detected — open/circuit or no load on LH turn-signal lamp circuit.
Repair difficulty: Easy
Diagnostic time: 0.5-1.5 hours
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