Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Control Unit Input Tests
Before performing control unit input tests, ensure multiplex control units are operating properly. See MULTIPLEX CONTROL SYSTEMS article in the ACCESSORIES/SAFETY EQUIPMENT section. See WIRING DIAGRAMS . Check connectors for open, loose or disconnected terminals. If terminals are bent, loose or corroded, repair as necessary and recheck system. See WIRING DIAGRAMS . If control unit input tests are okay, replace tested control unit and recheck system. See Fig 1 -Fig 6 . See appropriate MULTIPLEX CONTROL UNIT CONNECTOR TERMINAL IDENTIFICATION table.
| Terminal No. (Wire Color) (1) | Circuit Identification | ||
|---|---|---|---|
| 1 (WHT/YEL) | Battery Voltage Input | ||
| 2 (GRN/WHT) | Power Window Relay Input | ||
| 3 (RED/BLK) | Master Switch Light - Power | ||
| 4 (BLU) | Window Motor Pulse Input | ||
| 5 (GRN/BLU) | Door Switch Input | ||
| 6 (GRN/WHT) | Key Cylinder Switch UNLOCK | ||
| 7 (BLU/WHT) | Knob Switch LOCK | ||
| 8 (GRN/RED) | Lock Switch UNLOCK | ||
| 10 (RED/BLU) | Window Motor Control | ||
| 11 (RED/YEL) | Window Motor Control | ||
| 12 (BLK) | Ground | ||
| 13 (RED) | Master Switch Light GROUND | ||
| 14 (BLU/BLK) | Trunk Opener Switch Input | ||
| 15 (BRN/YEL) | Door "D" Line | ||
| 16 (GRN/RED) | Key Cylinder Switch LOCK | ||
| 17 (GRN/BLK) | Knob Switch UNLOCK | ||
| 18 (GRN/WHT) | Lock Switch LOCK | ||
| 19 (BLK) | Ground | ||
| 20 (GRY/BLK) | Main Switch Output | ||
|
|||
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.