The Wira’s door harness is notorious for snapping wires in the rubber boot between the door and the A-pillar.
Rating: 7/10
The wiring architecture of the Wira is mechanically robust but electrically archaic. If you are trying to fix a specific fault, the diagram is your best friend, but it requires patience to interpret. It is a "classic" automotive electrical system—simple in theory, but messy in execution due to aging components. proton wira wiring diagram
Proton follows Mitsubishi’s color code system. The first letter = base color, second = stripe. The Wira’s door harness is notorious for snapping
| Abbr. | Color | Function | | :--- | :--- | :--- | | B | Black | Primary ground (chassis/body) | | B/Y | Black/Yellow | Ignition-switched ground (ECU) or main ground | | R | Red | Constant battery +12V (unfused/fused) | | B/R | Black/Red | Main relay control or sensor ground | | W | White | Alternator charge output | | W/B | White/Black | Ignition coil negative (tachometer signal) | | Y | Yellow | Starter solenoid signal | | G | Green | Sensor signals (TPS, MAP, water temp) | | L | Blue | Accessory/switched +12V (heater, wipers) | | O | Orange | Lighting (parking, tail, dash illumination) | Proton follows Mitsubishi’s color code system
Critical: A wire labeled
B/Yis not positive. It is almost always a switched ground or chassis ground.