Self Test Mode
The CCU can be put into a self test mode to enable the inputs and outputs to be tested for correct functionality without the need for T4. To put the CCU into the self test mode the vehicle must be unlocked and disarmed, then the ignition turned on and the following sequence completed within 4 seconds:
- Hold the rear fog guard lamp switch on.
- Turn the ignition off.
- Turn the ignition on.
- Release the rear fog guard lamp switch.
On successful entry to the self test mode the CCU simultaneously operates the sounder and illuminates the courtesy lamps for 0.8 second.
When testing an input, e.g. a door open switch, on successful receipt of the input the CCU also simultaneously operates the sounder and illuminates the courtesy lamps for 0.8 second.
Outputs are tested in sequence using the CDL lock switch to progress through the outputs. A CDL unlock request repeats the last test. Outputs are either operated continuously until the CDL lock switch is released, or operated with a pulse.
| Output | Test Type |
|---|---|
| Rear fog lamps | Continuous |
| Lock | Pulsed for 0.76 second |
| Superlock | Pulsed for 0.76 second |
| Unlock | Pulsed for 0.76 second |
| Front wiper | Continuous, then self parks |
| Alarm LED | Continuous |
| Volumetrics | Continuous |
| Horn | Pulsed for 0.8 second |
| Heated windscreen | Pulsed for 0.8 second |
| Heated rear window | Pulsed for 0.8 second |
| Tail window down | Pulsed, drives fully down |
| Tail door actuator | Pulsed for 0.44 second |
| Tail window up | Pulsed, drives fully up |
| Rear wiper | Continuous |
| Hazard lamps | Continuous |
| Door open warning | Continuous |
| Seat belt warning lamp | Continuous |
| Handbrake/Brake warning lamp | Continuous |
| Daytime running lamps | Continuous |
Self test mode is cancelled when the ignition is turned off, if oil pressure is sensed (i.e. engine running) or if the vehicle speed exceeds 0.6 mph (1 km/h).