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.
Keyless Control Unit Test
Disconnect keyless control unit harness connector. On Colt Vista, Expo LRV and Summit Wagon, keyless control unit is located behind left quarter panel, above wheelwell. On Expo, keyless control unit is located behind right quarter panel, above wheelwell. Using DVOM, measure voltage between selected terminal and vehicle ground. See KEYLESS CONTROL UNIT VOLTAGE SPECIFICATIONS . See Fig 1 . If voltage is not within specification, inspect and repair circuit as needed. See appropriate chassis wiring diagram in the WIRING DIAGRAMS section.
| Terminal (Wire Color) | Function/Description | Terminal Voltage | ||
|---|---|---|---|---|
| 1 (Red/White) | Key Reminder Switch | Battery Volts W/Key Installed, 0 Volts With Key Removed | ||
| 2 (Red/Green) | Door Switch | 5 Volts W/Door Open | ||
| 6 (Brown/Blue) | Door Lock Actuator (Left Side) | Lock-5 Volts (Pulse Output) (1) , Unlocked: 0 Volts | ||
| 9 (Blue) | Control Unit Power Supply (Switched) | Battery Voltage W/Ignition Switch In ACC Position | ||
| 10 (Red/Yellow) | Control Unit Power Supply (Constant) | Battery Voltage | ||
| 11 (Red) | Dome Light | Battery Voltage W/Dome Light Sw. In ON Position | ||
| 12 (Black/Blue) | Door Lock Relays 1 & 2 | 0 Volts Actuated, Battery Voltage When Not Actuated | ||
| 13 (Black/Green) | Door Lock Relays 1 & 2 | 0 Volts Actuated, Battery Voltage When Not Actuated | ||
| 14 (Red/Green) | Door Lock Relay 2 | 0 Volts Actuated, Battery Voltage When Not Actuated | ||
| 20 (Black) | Ground | 0 Volts | ||
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NO RELATED
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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.