The Proton Wira power window circuit is notorious for slow movement and failure, especially on the driver’s side.
Enthusiasts love swapping the 4G15 to a 4G93 DOHC or adding MIVEC. The wiring diagram is your roadmap.
Here are the five critical sections of the Wira harness you must master.
Proton follows Mitsubishi’s color code system. The first letter = base color, second = stripe. proton wira wiring diagram
| 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) |
Critical: A wire labeled
B/Yis not positive. It is almost always a switched ground or chassis ground.
The Wira has a dedicated door sub-harness that often breaks in the rubber boot between chassis and door. The Proton Wira power window circuit is notorious
Power window logic (Driver door master switch):
Central locking (If equipped):
Proton Wira headlights run on a negative switching system (the relay coil is grounded by the steering column stalk). Aftermarket ECU (Standalone): Use the diagram to identify
Troubleshooting: If the fuel pump doesn’t prime, check the Engine Control Relay (behind the radio/dashboard). The ECU grounds pin 12 (Black/Green) to turn it on.
Let's say your Proton Wira fuel pump is not priming. Here is how you use the diagram: