B14A0

Code

Generic B — Body

Front passenger door lock actuator circuit fault

Brand: Generic

Type: B — Body

Views: UK: 30 EN: 32 RU: 31

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Blown fuse or fusible link supplying door locks
Open or shorted wiring between the BCM/door module and passenger door actuator
Corroded, loose, or damaged connector at the passenger door actuator
Failed/passenger door lock actuator motor or internal switch
Water intrusion or contamination in the door harness or actuator
Mechanical binding or jam in the lock mechanism causing electrical overload

Symptoms

Front passenger door will not lock or unlock with key fob, door switch, or automatic lock commands
Intermittent locking/unlocking or only locks in one direction
Noise (grinding or clicking) from inside the passenger door when commanded
Other doors operate normally while passenger door is inoperative
Blown fuse or parasitic drain in severe cases
Possible entry/anti-theft warnings if the system detects failures

What to check

Read and record freeze frame and any related codes with a scan tool
Inspect fuses/relays for the door lock circuit
Operate locks with a scan tool and note response, error messages, or current draw
Visually inspect passenger door wiring, harness boot at hinge, and connector for corrosion, damage, or water
Check for corrosion or bent pins at the actuator connector
Listen for actuator noise when commanding lock/unlock

Signal parameters

Nominal supply voltage to actuator: ~12 V when commanded (vehicle battery present)
Ground reference: 0 V at chassis ground
Actuator coil/static resistance (typical): roughly 5–30 ohms (varies by design) — consult vehicle spec
Lock/unlock command waveform: direct 12 V/ground or pulse/PWM depending on vehicle (scan tool output/state may be high/low)
Current draw when operating: small motor current surge (consult service spec)

Diagnostic algorithm

Verify code and related DTCs with a scan tool; clear codes and attempt to re-create fault
Visually inspect door harness, rubber gaiter at hinge, and actuator connector for damage, corrosion, or water ingress
Check fuses and relays for the door lock circuit; replace if blown and re-test
Command the front passenger door lock with a scan tool while an assistant observes the door and connector
Backprobe the actuator connector while commanding lock/unlock: verify proper supply voltage and ground switching at the connector
If no voltage change at connector, trace wiring back to BCM/door module; check for open/short to power or ground and continuity to BCM
If correct voltage is present but actuator does not move, disconnect connector and measure actuator resistance; if within spec, bench-test actuator with 12 V (observe correct direction/polarity)
If actuator bench-test fails, replace actuator and re-test operation and code status
If actuator works on bench but fails in-vehicle, inspect harness for intermittent short/open where it flexes at hinge; repair wiring or replace harness as needed
If wiring and actuator are good but no command from BCM/door module, check BCM outputs, grounds, and data bus communications (check for related U-codes). Replace or reprogram BCM only after confirming external components are good
After repair, clear codes, operate locks through multiple cycles, and road-test; verify no return of the code

Likely causes

Corroded/loose connector at front passenger door actuator
Open or short in the door harness where it flexes at the door hinge
Failed actuator motor (wear or water damage)
Blown fuse protecting lock circuit
Intermittent BCM/door module output or poor ground

Fault status

⚠️ Status

Front passenger door lock actuator circuit fault detected — open/short/intermittent or actuator failure. System may be unable to lock/unlock the front passenger door.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-3.0 hours