Accessory Delay Relay Contact Short To Battery
The accessory delay relay contact is electrically stuck to the battery voltage instead of switching properly. Think of it like a light switch that's jammed in the 'on' position and won't turn off.
The ECU monitors the accessory delay relay control circuit for proper voltage switching between ground and battery. It detects when the relay contact is shorted directly to battery voltage instead of cycling on and off as commanded, indicating a welded or stuck relay contact.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Relay Contact Voltage | 0V (off) to 12V+ (on) with proper switching | Continuous 12V+ when command is for off-state |
| Control Signal Response | Relay activates/deactivates within 200ms of command | No change in relay state despite command signal |
Code B1475 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, B1475 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.