Oldsmobile Alero 2003-2004 Wiring Diagrams alarm remote start
This vehicle is equipped with GM's Passlock II Anti-Theft Security System. Use Universal Alarm Bypass Module part #2x402 where X can be any number.On the 2.2L models use white wire in the black plug. On the 3.4L models use PURPLE / white in the blue plug. The Powertrain Control Module (PCM) is under the driver side dash left of the steering column. The Body Control Module (BCM) is between the blower motor and the passenger side kick panel.
| Function | Vehicle Color | Location |
| Start: | Yellow (+)* | Ignition switch harness* |
| Ignition #1: | Pink (+) | Ignition switch harness |
| Ignition #2: | Dk.Green (+) | Ignition switch harness |
| Ignition #3: | N/A | Ignition switch harness |
| Accessory: | Orange (+) | Ignition switch harness |
| Brake Light: | Lt.Blue (+) | Brake pedal switch |
| Tach Signal: | White or PURPLE / White (AC) | At the PCM** |
| Parking Lights: | Brown (+) | Gray plug at the BCM*** |
| Headlights: | N/A | |
| Diesel Glow Plug: | N/A | |
| Clutch Bypass Wire: | N/A |
Alarm and Keyless Entry Wiring Colors and Notes
The Body Control Module (BCM) is between the blower motor and the passenger side kick panel.
| Function | Vehicle Color | Location |
| Constant +12 Volts: | Red & RED / Black (+) | Ignition switch harness |
| OEM Alarm Disarm: | N/A | |
| Dome Lights/Superv: | White (-) | Pink plug at BCM*** |
| OEM Horn: | Black (-) | Gray plug at BCM*** |
| Power Lock: | White (-) | Gray plug at BCM*** |
| Power Unlock: | Same wire as power lock | Gray plug at BCM*** |
| Trunk Release: | Black (-) | Gray plug at BCM*** |
| Alarm Input Wire: | White (-) | Gray plug at BCM*** |