B1625

Lamp Keypad Output Short Circuit To Battery

Body Chassis/Safety Lighting Control 🟢 Low — Fix at next service ✅ Safe to Drive
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What This Actually Means

In plain language — no jargon

The lamp keypad circuit is shorted directly to the vehicle's battery voltage, causing the ECU to detect an abnormal electrical condition. Think of it like a wire touching a live power line when it shouldn't be connected at all.

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Symptoms You May Notice

3 known symptoms for this code
Dashboard lamp or keypad illumination stays on constantly or flickers erratically
Inability to control lamp brightness or keypad functions through normal controls
Potential battery drain if short remains active
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How Your ECU Detects This

Technical sensor logic and voltage thresholds

The ECU monitors the lamp keypad output circuit voltage and current draw. It expects a controlled voltage signal that varies with normal operation, but detects a sustained battery voltage level (typically 12-14V) when the circuit should be at ground or a lower reference voltage.

Voltage & Parameter Thresholds

ParameterNormal RangeFault Condition
Output Voltage 0-5V or controlled PWM signal Sustained battery voltage (12-14V)
Current Draw Expected load range Excessive current indicating direct short to positive
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Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex
1
Wire harness connectors
Inspect and reseat all connectors at the lamp keypad module to eliminate poor contact causing voltage spikes.
2
Wiring harness
Check for damaged insulation or pinched wires near the keypad circuit and repair or replace affected sections.
3
Lamp keypad module
Replace the lamp keypad assembly if wiring inspection reveals no faults and the short persists.
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When to See a Professional Mechanic

Not all fault codes are safe to DIY

Code B1625 is a low-severity fault. Your vehicle is generally safe to drive to a workshop for diagnosis. However, do not ignore it indefinitely — low-severity codes often indicate developing problems that become expensive if neglected. Book a diagnostic appointment within 2–4 weeks. If you notice any additional symptoms (rough running, power loss, unusual smells), treat it as higher priority.

Safety note: OBD-II codes identify the system or circuit where a fault was detected — they do not always identify the exact failed component. A professional mechanic using live sensor data will diagnose the root cause more accurately than replacing parts based on the code alone.
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How to Clear Code B1625

What happens after you fix the fault

Once the fault is repaired, B1625 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.

The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.

✅ Safe to Clear When
  • Fault has been diagnosed and repaired
  • You want to confirm the repair worked
  • Code appeared after a sensor was cleaned
⚠️ Do Not Clear When
  • Preparing for an emissions/PUC test
  • Root cause is still undiagnosed
  • Check engine light is flashing
Emissions test note: Clearing codes resets OBD readiness monitors. Most vehicles need 50–100 km of mixed driving before monitors complete. Do not clear codes immediately before an emissions or PUC inspection.