B1341

Code

Other B — Body

Power Door Unlock Circuit Short To Ground

Brand: Other

Type: B — Body

Views: UK: 39 EN: 56 RU: 61

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Page language: EN

Causes

Damaged or chafed unlock wiring contacting chassis ground
Corroded or damaged connector pins
Failed door unlock actuator (internal short)
Shorted aftermarket alarm/remote lock actuator wiring or connector
Faulty body control module (BCM) or door module driver stage
Water intrusion in door harness or connector

Symptoms

Door unlock does not operate or operates intermittently
Fuses related to door lock/unlock may be blown
Other door/lock related features may be disabled or behave erratically
Diagnostic trouble code B1341 stored and possibly other body network codes
Battery drain in some cases if short is present continuously

What to check

Retrieve all related DTCs with a scan tool and note freeze frame data
Visual inspection of door harness, boots, and connectors for damage or corrosion
Check related fuses for continuity and signs of overheating
Backprobe unlock circuit at actuator connector and measure voltage when unlock is commanded
Measure resistance from unlock wire to chassis ground with connectors disconnected
Disconnect aftermarket alarm/remote modules and re-test

Signal parameters

Inactive circuit: should be open/high impedance or at specified resting voltage per factory data (consult service manual)
Active command: circuit should be driven by module—either switched to ~12 V or switched to ground depending on vehicle design (see wiring diagram)
Short-to-ground symptom: voltage near 0 V at unlock wire when commanded and continuity to chassis ground low (< 5–10 Ω)
Healthy open circuit continuity: high resistance or open between unlock conductor and chassis ground (> 10 kΩ typical)

Diagnostic algorithm

Read and record DTCs and freeze frame. Clear codes and attempt an unlock cycle to re-create the fault.
Inspect fuses, connectors, and wiring visually from BCM/door module to the door actuator for damage or corrosion.
With ignition on, backprobe the unlock output at the door actuator connector and command unlock while watching voltage. Note behavior.
With vehicle off, disconnect actuator and measure resistance from the unlock conductor to chassis ground. A low resistance indicates a short in wiring or actuator.
If short present with actuator disconnected, isolate by unplugging intermediate connectors one at a time (door harness, body harness) until the short disappears to locate the damaged section.
If short disappears when disconnecting the actuator, bench-test or replace the actuator. If short remains, repair wiring (replace harness section, repair chafe) or connector corrosion.
If wiring and actuator check good, test module output driver. Some modules allow driver tests via a dealer scan tool. If driver is damaged, replace the BCM/door module as last resort.
After repair, perform a functional test of locking/unlocking, clear codes, and confirm that B1341 does not return and no related fuses blow.

Likely causes

Chafed wiring in door jamb harness rubbing to a metal surface
Connector corrosion at door latch/actuator connector
Burned driver transistor inside BCM after repeated short
Aftermarket remote start/lock module tied into unlock circuit incorrectly
Actuator motor shorted internally to ground

Fault status

⚠️ Status

Short-to-ground detected on the power door unlock circuit. The module is reporting low resistance to ground on the unlock output; the circuit may be preventing normal unlock operation and could blow related fuses.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours