Passenger Door Disarm Switch ckt Short to Ground
The passenger door's disarm switch has an electrical short that's grounding the signal wire, like a light switch with a broken wire touching metal. The vehicle's control module detects abnormally low voltage on this circuit and sets the fault code.
The ECU monitors the voltage signal from the passenger door disarm switch circuit, expecting a specific voltage range when the switch is engaged or disengaged. When the circuit shorts to ground, voltage drops abnormally low, signaling a wiring fault. The module compares this signal against learned thresholds to detect the short condition.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Switch Signal Voltage | 4.5V - 5.5V (varies by design) | Below 0.5V (shorted to ground) |
| Circuit Resistance | 10kΩ - 100kΩ open; <100Ω closed | <5Ω indicating short path |
Code B2473 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.
Once the fault is repaired, B2473 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.