B0235

Code

Generic B — Body

Left Front Door Lock Circuit Short to Ground

Brand: Generic

Type: B — Body

Views: UK: 8 EN: 13 RU: 8

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Page language: EN

Scan for active and stored DTCs; note freeze frame and related codes
Inspect left front door wiring along the hinge/jamb for damage or pinching
Visually and mechanically inspect connectors at the door and body harness
Check door lock fuse and related relays for damage or signs of overheating
Measure resistance/continuity between the lock output pin and chassis ground with connector disconnected
Back-probe the lock actuator connector while operating the lock to observe voltage and polarity

Battery voltage (nominal): 12.0–14.5 V on supply circuits
Actuator coil resistance (typical): 5–50 ohms depending on design — consult vehicle spec
Expected driver output when commanded: switches between battery voltage and ground (polarity reversal) or supplies a PWM drive; measured voltage change should correspond to command
Short-to-ground condition: low resistance (
Current draw during operation: normally under several amps; excessive current (>5–10 A) suggests short or seized actuator (check vehicle spec)

Retrieve freeze frame and history of B0235, check for related door or body codes.
Visually inspect door hinge area harness for abrasion, broken insulation, or paint-through spots where wires flex. Repair any damaged wiring using proper splices/protection.
With ignition off, disconnect the left front door lock actuator connector. Measure resistance between the suspected BCM output pin and chassis ground. Resistance near zero indicates a short to ground in harness or actuator.
If resistance is high/normal with connector disconnected, back-probe the connector at the body harness side and operate the lock while monitoring voltage. Verify expected voltage/polarity changes. No change or stuck at ground suggests module driver fault.
If the harness side shows normal behavior but the actuator side does not, test actuator directly by applying fused 12 V briefly (observe polarity and current). Replace actuator if it draws excessive current or does not operate.
Inspect and clean connectors; repair corroded terminals or replace connector halves and rubber seals as needed. Re-test after repairs.
If wiring and actuator check good, perform module output driver test per manufacturer procedure (may require oscilloscope or specialized tool). Replace/control module only after confirming driver failure.
After repair, clear codes and perform multiple lock/unlock cycles to confirm DTC does not return. Document repairs and advise customer of any recurring or intermittent wiring issues.