Central Timer Module (CTM)

This module has two versions:
- a standard version for vehicles with manual transmission
- an extended version for vehicles with automatic transmission

Functions of the CTM standard version:
- Intermittent wiper, front
- Intermittent wiper, rear
- Rear window washer with wiper function
- Front windscreen washer with wiper function
- Heated rear window
- Heated windscreen
- Entry Illumination
- Power saving relay
- Required acoustic signal from trip computer module, anti-theft warning system/double locking module and airbag module
- Lights-on Warning Chime Unit

Additional functions of the CTM extended version:
- Safety belt warning
- Reverse gear warning
- Ignition key warning
- Warning - shift lever not in park position

Intermittent wiper, front
If the wiper control switch is switched to Intermittent position while the ignition is on, then the wipers will operate at fixed intervals (8.0 ± 2.0 seconds). In the case of vehicles with variable delay units, the time between wipe operations can be set from "1" to "6" (1.0 - 22.0 seconds) using the potentiometer on the multi-function switch. The intermittent wipe operation mode periodically repeats until the Intermittent switch setting is turned off. If the potentiometer is used to change the delay time during intermittent mode, then the wiper cycle is completed before the new delay time takes effect. If the switch is turned off and on again during the wiper interval, then intermittent mode immediately begins again at the delay time set. The CTM sends respective ground pulses to the front windscreen wiper relay, whereupon the relay activates the front windscreen wiper motor.

Intermittent wiper, rear
If the rear wiper control switch is switched on while the ignition is on, then the rear wipers will operate at fixed intervals (12.0 ± 3.0 seconds). After every completed wiper operation and delay time, the CTM sends a pulse (0.6 ± 0.2 seconds) to the rear wiper relay. The rear wiper motor is switched off by its own limit switch.

Rear window washer with wiper function
If the rear window washer switch is operated, the washer pump and the rear window wiper are switched on. If the rear window washer switch is released, the washer pump is immediately switched off. The run-on time for the rear wiper is (4.0 s ± 1.0 s). The duration of the ground pulse for the rear wiper relay is transmitted by the CTM and amounts to 0.6 s ± 0.2 s.

Front windscreen washer with wiper function
If the front windscreen washer switch is operated, the washer pump and the front windscreen wiper are switched on. If the front windscreen washer switch is released, the washer pump is immediately switched off. The front windscreen wiper motor performs another 2-3 wiper cycles and is then switched off by the CTM by means of the front wiper relay or the limit switch.

Heated Rear Window
To switch on the heated rear window, the heated rear window switch must be pressed for at least 30 ms. The heated rear window will then be switched on for 10 min ± 2 min via the heated rear window relay. During these 10 mins the heated rear window can be switched off either by pressing the heated rear window switch again, or by turning off the ignition. Under these conditions, the CTM sends a ground signal to the heated rear window relay, which in turn switches the heated rear window. If the ignition switch in turned to "Start" while the heated rear window is switched on, then the heater will be temporarily switched off during this time.

Heated windscreen
To switch on the heated windscreen, the heated windscreen switch must be pressed for at least 30 ms. The heated windscreen will then be switched on for 4 min ± 1 min via the heated windscreen relay. During these 4 mins the heated windscreen can be switched off either by pressing the heated windscreen switch again, or by turning off the ignition. The heated windscreen can only be activated when the generator is supplying voltage, i.e. when the engine is on. Under these conditions, the CTM sends a ground signal to the heated windscreen relay, which in turn switches the heated windscreen.

Entry Illumination
For vehicles without remote control: The interior light will be switched on when one of the doors is opened, regardless of the ignition key position, as long as the vehicle is unlocked and the interior light switch is in the "Delay" position. Within 0.5 s, the CTM regulates the lights from off to full brightness. When the doors are closed, there are two options. The interior light remains at full brightness for 20 s and then dims to darkness within 5 s. If the ignition is switched on after closing the doors, then the light will be dimmed out within 2 s.

For vehicles with remote control: If the vehicle is unlocked using remote control, then the ATWS/double locking system operates the CTM. This regulates the lights from darkness to full brightness within 0.5 s, before a door is opened. If the vehicle is locked using the remote control, then the interior light is dimmed out within 2 s.

If the ignition is switched off before the exterior lighting, then the interior lights come on for 20 s at full brightness before dimming out within 5 s. The same thing happens when the exterior lighting is switched off while the ignition is on, and the ignition then is switched off within 20 s.

30 mins after switching off the ignition, the interior lighting is switched off by the CTM by means of the power saving relay if one of the doors is open and the interior lighting switch is in "Delay" position.

The luggage compartment light is not controlled by the CTM.

Power saving relay
30 mins after switching off the ignition, the CTM turns off the power saving relay and switches to Off mode. This mode applies until one of the following occurs: Unlocking by remote control, opening a door or the tailgate, or switching the ignition key to "Radio" or "Ignition" position. The power saving relay is then re-activated by the CTM and supplies current back to the components that it switched off in the vehicle (interior lighting, electric mirror adjustment mechanism).

Acoustic Signal
The following modules request acoustic signals from the CTM: Trip computer module, anti-theft warning system/double locking module and airbag module. Since the requesting modules do not have an acoustic warning system, they send a ground pulse to the corresponding input on the CTM, at which point the CTM in turn sends a defined acoustic signal. The CTM determines which acoustic signal has to be transmitted from the length of the input pulse. The airbag module sends a ground signal to the CTM if the warning lamp in the instrument cluster bezel is activated by the CTM, but is faulty. Otherwise, the airbag module sends a ground signal to the CTM each time the ignition is switched on, in order to maintain the contact to the module connector. The trip computer module sends a ground signal to the CTM if the fuel level drops below a certain level, or to confirm each time one of the trip computer module switches is pressed.

Lights-on Warning Chime Unit
If the driver's door is opened when the ignition is switched off and the parking light, dipped beam or main beam are still on, then the warning buzzer sounds (integrated in the CTM). The buzzer stops when the exterior lighting is switched off, the driver's door is closed or the power saving relay switches off after 30 mins.

Safety Belt Warning
If the ignition is switched on and the safety belt is not fastened, then the warning buzzer sounds for 4 to 8 s and the belt buckle warning lamp in the instrument cluster comes on. The warning lamp goes out if the safety belt is fastened into the buckle within 80 s ± 15 s. If this happens while the buzzer is still operating, then this stops as well. The warning lamp stays on if the seat belt buckle is not operated within 80 s. The input signal is transmitted to the CTM when contact is made at the seat belt buckle.

Reverse gear warning
In vehicles with automatic transmission, an audible warning with a frequency of 3 Hz is output after 0.8 s if the shift lever is switched to "R" (reverse gear). The input signal is transmitted from the Transmission Range (TR) sensor to the CTM.

Ignition key warning
An acoustic signal is transmitted from the warning buzzer in the CTM when the ignition key is turned to "R" or "Off" position and at the same time the driver's door is opened. The input signals are transmitted from the ignition key position sensor and from the driver's side door switch to the CTM.

Warning - shift lever not in park position
An acoustic signal is transmitted from the warning buzzer in the CTM if the shift lever is not placed in position "P" (park position) and at the same time the driver's door is opened. The input signals are transmitted from the TR sensor and from the driver's side door switch to the CTM. The buzzer stops when the shift lever is placed in position "P", the driver's door is closed or the power saving relay is switched off after 30 mins.

The acoustic signal is also transmitted if the lighting warning signal and the park position signal are transmitted at the same time. The buzzer stops only when the conditions for its activation no longer apply, i.e. when the shift lever is in position "P", the driver's door is closed or the exterior lighting is switched off.