Code
B16A0
MITSUBISHI
B — Body
Tail lamp(RH) circuit open
Views:
UK: 6
EN: 16
RU: 8
AI status
Completed
Completed
100%
Causes
- Burned-out bulb or broken filament
- Blown fuse or fusible link in lighting circuit
- Open or damaged wiring (broken conductor, chafed harness) between tail lamp and BCM or fuse
- Corroded/loose connector or bulb socket at the RH tail lamp
- Faulty ground connection for the RH tail lamp
- Faulty BCM or lighting control module (rare)
Symptoms
- Right rear tail lamp does not illuminate with parking/headlights ON
- Possible warning message or dashboard indicator for lighting fault on some vehicles
- No change when operating lighting switch; left tail lamp remains functional
- DTC B16A0 stored in BCM/diagnostic tool
What to check
- Retrieve and confirm DTC(s) with a scan tool; note freeze-frame data if available
- Visually inspect RH tail lamp bulb, socket, and connector for damage, corrosion, or poor seating
- Check fuses and fusible links for the exterior lighting circuit
- Operate lights and observe whether bulb filaments glow or socket has a loose fit
- Wiggle wiring harness at the tail lamp while observing lamp behavior to detect intermittent opens
- Measure voltage at the tail lamp socket with lights ON and ground present
Signal parameters
- Tail lamp supply voltage: approx. battery voltage when lights ON (about 11–14 V) measured at the lamp positive terminal
- Open-circuit indication: infinite resistance (OL) between lamp positive terminal and fuse/BCM output when measured with power removed
- Bulb filament resistance (typical incandescent): low ohms when cold (commonly ~1–5 Ω) — open filament reads OL
- Ground continuity: low resistance (
- Fuse continuity: near 0 Ω when good
Diagnostic algorithm
- Confirm code B16A0 is current or stored and note any related lighting codes
- Perform visual inspection: bulb condition, socket corrosion, connector retention, wiring damage, and ground connection at rear body
- Check fuse(s) for taillight/parking lights; replace if blown and re-test (do not replace repeatedly without finding cause)
- Remove bulb and test bulb on a known good socket or bench with 12 V to confirm bulb/function
- With connector disconnected and power OFF, check continuity from tail lamp positive contact to BCM fuse output and from tail lamp ground to chassis ground
- With lights ON, measure voltage at the tail lamp socket positive terminal; if 12 V present and lamp not lighting, socket or bulb is faulty; if no voltage, trace back toward fuse/BCM
- Inspect/interrogate BCM connector pins for corrosion, bent pins, or pushed out terminals if wiring and fuses check OK
- Repair found wiring damage (splice, replace section of harness, repair connector) or replace bulb/socket as needed; clean or repair ground connections
- After repair, clear DTCs with a scan tool and verify proper function and no code recurrence during a short road/test cycle
Likely causes
- RH tail lamp bulb filament failed
- Connector at tail lamp socket corroded or pushed out
- Wire damaged by rubbing, pinch, or a previous repair causing an open
- Fuse for exterior lights blown or contact poor
- Ground wire/strap at rear body corroded or disconnected
- Internal BCM output transistor open or connector pin loose (after other causes ruled out)
Fault status
Status
Tail lamp (RH) circuit open — right rear tail lamp circuit has lost continuity or supply. Check bulb, socket/connector, wiring, fuse, ground, and body control module.
Repair difficulty: Easy
Diagnostic time: 0.5 - 1.5 hours
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